The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Sedat Yurdakal - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • environmentally friendly photocatalytic oxidation of Aromatic Alcohol to aldehyde in aqueous suspension of brookite tio2
    Catalysis Letters, 2008
    Co-Authors: Maurizio Addamo, Vittorio Loddo, Sedat Yurdakal, Giovanni Palmisano, Vincenzo Augugliaro, Leonardo Palmisano, Marianna Bellardita, Agatino Di Paola
    Abstract:

    Photocatalytic oxidation of 4-methoxybenzyl Alcohol to aldehyde in water has been achieved by using home-prepared uncalcined brookite TiO2. Three different lamp irradiances have been applied in order to check the influence of light power on selectivity. Well known commercial samples (Degussa P25 and Merck) have been used for comparison purposes. A maximum selectivity towards aldehyde of ca. 56% (i.e. ca. 3 times higher than that obtained with commercial TiO2) has been achieved.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide
    Applied Catalysis A: General, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterisation of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); and (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway

Vincenzo Augugliaro - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • environmentally friendly photocatalytic oxidation of Aromatic Alcohol to aldehyde in aqueous suspension of brookite tio2
    Catalysis Letters, 2008
    Co-Authors: Maurizio Addamo, Vittorio Loddo, Sedat Yurdakal, Giovanni Palmisano, Vincenzo Augugliaro, Leonardo Palmisano, Marianna Bellardita, Agatino Di Paola
    Abstract:

    Photocatalytic oxidation of 4-methoxybenzyl Alcohol to aldehyde in water has been achieved by using home-prepared uncalcined brookite TiO2. Three different lamp irradiances have been applied in order to check the influence of light power on selectivity. Well known commercial samples (Degussa P25 and Merck) have been used for comparison purposes. A maximum selectivity towards aldehyde of ca. 56% (i.e. ca. 3 times higher than that obtained with commercial TiO2) has been achieved.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide
    Applied Catalysis A: General, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterisation of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); and (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway

Leonardo Palmisano - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • environmentally friendly photocatalytic oxidation of Aromatic Alcohol to aldehyde in aqueous suspension of brookite tio2
    Catalysis Letters, 2008
    Co-Authors: Maurizio Addamo, Vittorio Loddo, Sedat Yurdakal, Giovanni Palmisano, Vincenzo Augugliaro, Leonardo Palmisano, Marianna Bellardita, Agatino Di Paola
    Abstract:

    Photocatalytic oxidation of 4-methoxybenzyl Alcohol to aldehyde in water has been achieved by using home-prepared uncalcined brookite TiO2. Three different lamp irradiances have been applied in order to check the influence of light power on selectivity. Well known commercial samples (Degussa P25 and Merck) have been used for comparison purposes. A maximum selectivity towards aldehyde of ca. 56% (i.e. ca. 3 times higher than that obtained with commercial TiO2) has been achieved.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide
    Applied Catalysis A: General, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterisation of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); and (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway

Vittorio Loddo - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • environmentally friendly photocatalytic oxidation of Aromatic Alcohol to aldehyde in aqueous suspension of brookite tio2
    Catalysis Letters, 2008
    Co-Authors: Maurizio Addamo, Vittorio Loddo, Sedat Yurdakal, Giovanni Palmisano, Vincenzo Augugliaro, Leonardo Palmisano, Marianna Bellardita, Agatino Di Paola
    Abstract:

    Photocatalytic oxidation of 4-methoxybenzyl Alcohol to aldehyde in water has been achieved by using home-prepared uncalcined brookite TiO2. Three different lamp irradiances have been applied in order to check the influence of light power on selectivity. Well known commercial samples (Degussa P25 and Merck) have been used for comparison purposes. A maximum selectivity towards aldehyde of ca. 56% (i.e. ca. 3 times higher than that obtained with commercial TiO2) has been achieved.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide
    Applied Catalysis A: General, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterisation of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); and (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway

Giovanni Palmisano - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide: 1. Selectivity enhancement by aliphatic Alcohols
    Applied Catalysis A-general, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway.

  • environmentally friendly photocatalytic oxidation of Aromatic Alcohol to aldehyde in aqueous suspension of brookite tio2
    Catalysis Letters, 2008
    Co-Authors: Maurizio Addamo, Vittorio Loddo, Sedat Yurdakal, Giovanni Palmisano, Vincenzo Augugliaro, Leonardo Palmisano, Marianna Bellardita, Agatino Di Paola
    Abstract:

    Photocatalytic oxidation of 4-methoxybenzyl Alcohol to aldehyde in water has been achieved by using home-prepared uncalcined brookite TiO2. Three different lamp irradiances have been applied in order to check the influence of light power on selectivity. Well known commercial samples (Degussa P25 and Merck) have been used for comparison purposes. A maximum selectivity towards aldehyde of ca. 56% (i.e. ca. 3 times higher than that obtained with commercial TiO2) has been achieved.

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide
    Applied Catalysis A: General, 2008
    Co-Authors: Vincenzo Augugliaro, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, Vittorio Loddo, Giovanni Palmisano, Leonardo Palmisano, Sedat Yurdakal
    Abstract:

    Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl Alcohol (BA) and 4-methoxybenzyl Alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterisation of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both Alcohols the main oxidation products were the corresponding Aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic Alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of Aromatic Alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the Aromatic Alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); and (ii) the aliphatic Alcohols preferentially compete with Aromatic Alcohols for the mineralizing pathway