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Aromatic Alcohols

The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Shifu Chen – 1st expert on this subject based on the ideXlab platform

  • Simultaneous dehydrogenation and hydrogenolysis of Aromatic Alcohols in one reaction system via visible-light-driven heterogeneous photocatalysis
    Journal of Catalysis, 2020
    Co-Authors: Sugang Meng, Xianliang Fu, Xiangju Ye, Xiaofeng Ning, Susheng Chang, Shifu Chen

    Abstract:

    Abstract Photocatalytic selective organic transformation using photoexcited holes and electrons has attracted worldwide interest. Although extensive studies have made significant progress in dehydrogenation of Alcohols, hydrogenolysis of Alcohols using photoexcited electrons directly constitutes a challenge. Here, photocatalytic selective dehydrogenation and hydrogenolysis of Aromatic Alcohols into corresponding alkanes/ethers and aldehydes has been achieved by direct use of photoexcited electrons and holes over CdS under visible light irradiation. Compared with other popular visible-light-driven photocatalysts, Sb 2 S 3 , Bi 2 O 3 , N-doped TiO 2 , Zn 3 In 2 S 6 , g-C 3 N 4 , and Ce 2 S 3 , the sum of the yields of alkanes and aldehydes over the as-prepared CdS could reach up to 94% after reaction for 4 h. The high photoactivity and stability of CdS toward dehydrogenation and hydrogenolysis of Aromatic Alcohols can be ascribed to its appropriate band potentials and effective charge separation–transportation. The optimum positions are that the valence band position should be located between oxidation potentials of alcohol/aldehyde and aldehyde/oxidized aldehyde, and the conduction band position should be more slightly negative than reduction potential of alkane/alcohol. During this reaction, the dehydrogenation reaction consumes two holes and produces two protons; the hydrogenolysis process depletes two electrons and two protons. Therefore, a cooperative, cyclical, and efficient reaction system was established.

  • Self-Assembly of CdS/CdIn2S4 Heterostructure with Enhanced Photocascade Synthesis of Schiff Base Compounds in an Aromatic Alcohols and Nitrobenzene System with Visible Light.
    ACS Applied Materials & Interfaces, 2019
    Co-Authors: Qiaoqiao Zhang, Xiangju Ye, Jinxin Wang, Longqiang Ye, Xuchun Wang, Shifu Chen

    Abstract:

    A series of novel CdS/CdIn2S4 composite materials were prepared via a one-pot solvothermal process. The as-obtained photocatalysts were characterized by several techniques and the photocatalytic properties of CdS/CdIn2S4 photocatalysts were studied by photocascade synthesis of Schiff base compounds in a photocatalytic reaction system of Aromatic Alcohols and nitrobenzene irradiated with visible light. The results reveal that the resulting CdS/CdIn2S4 heterostructure samples show outstanding photocatalytic activities toward the photocascade production of Schiff base compounds in an Aromatic Alcohols and nitrobenzene reaction system irradiated with visible light. An optimized 50.0% CdS/CdIn2S4 heterostructure sample shows the highest Schiff base yield of 42.0% irradiated with visible light for 4 h, which is approximately 19.1 and 1.54 times higher than those of sole CdS and CdIn2S4 samples, respectively. The fabrication of heterogeneous structure improves the spatial separation and migration of photoinduced…

  • Effective use of photogenerated electrons and holes in a system: Photocatalytic selective oxidation of Aromatic Alcohols to aldehydes and hydrogen production
    Journal of Catalysis, 2018
    Co-Authors: Sugang Meng, Xianliang Fu, Jinghu Zhang, Xiangju Ye, Shifu Chen

    Abstract:

    Abstract Effective utilization of photogenerated electrons and holes in a system is always a research hotspot. Photocatalysis has been identified as a promising solution to tackle the current environmental and energy issues. However, photogenerated holes or electrons were wasted in the traditional photocatalytic process. In the paper, a dual-function photocatalytic reaction system was constructed using dispersed Ptx-modified 2D-3D Zn3In2S6 hierarchical structures (x = 1–4). In the system, Aromatic Alcohols were photocatalytically selectively oxidated into aldehydes and protons were reduced to hydrogen by photogenerated holes and electrons, respectively. In the reaction process, one Aromatic alcohol is first dehydrogenated into Aromatic aldehyde and two H+ via the corresponding carbon-centered radical by consuming of two holes, and then two H+ ions dehydrogenated from OH group and α C H of alcohol are evolved into H2 by depleting of two electrons. Atomically dispersed Ptx could offer the maximum atom efficiency and significantly promote visible light absorption and separation of photogenerated electron-hole pairs. The cooperative photoredox system exhibits remarkable photocatalytic activity for visible light-driven splitting of Aromatic Alcohols. Under visible light irradiation for 6 h, The H2 output over 2.14% Pt/Zn3In2S6 reaches up to 950 μmol, which is around 7.5, 5.3 and 3.8 times higher than that over Zn3In2S6, Pt-nanoparticle/Zn3In2S6 and MoS2/Zn3In2S6, respectively. The apparent quantum efficiency (AQE) of 2.14% Pt/Zn3In2S6 at 400 nm is about 4.6%. The utilization rate of photogenerated electrons to holes could be achieved 98.2%. Moreover, Pt/Zn3In2S6 hybrid shows high stability even when Zn3In2S6 was stored for 12 months. Compared with two half-reactions: the photocatalytic selective organics transformation under O2 atmosphere and the water splitting with sacrificial reagents, such designed dual-purpose photocatalytic reaction not only could effective use of photogenerated electrons and holes for organics transformation and hydrogen production simultaneously but also shows much higher photocatalytic activity than two half-reactions. At the same time, the work also expands the research field of photocatalysis, such as N2 fixation and CO2 reduction by using of the as-produced H+.

Zhaohui Li – 2nd expert on this subject based on the ideXlab platform

  • Bi-functional NH2-MIL-101(Fe) for one-pot tandem photo-oxidation/Knoevenagel condensation between Aromatic Alcohols and active methylene compounds
    Catalysis Science & Technology, 2020
    Co-Authors: Dengke Wang, Zhaohui Li

    Abstract:

    Tandem reactions, which enable multistep reactions in one pot, offer enormous economical advantages. For the first time, this manuscript reported that NH2-MIL-101(Fe), an earth abundant Fe-containing MOF material, can catalyze efficiently the one-pot reaction between Aromatic Alcohols and active methylene compounds via a tandem photo-oxidation/Knoevenagel condensation under visible light and at room temperature. NH2-MIL-101(Fe) acts as a photocatalyst for the oxidation of Aromatic Alcohols to aldehydes as well as a base catalyst for Knoevenagel condensation between the as-formed aldehydes and the active methylene compounds. The comparison of the reactions over NH2-MIL-101(Fe) and another two MOFs (NH2-UiO-66(Zr) and NH2-MIL-125(Ti)) reveals that the strength of the basic sites in the MOFs influences significantly the efficiency of the tandem reaction. This study highlights the great potential of MOFs as multifunctional photocatalysts for one-pot tandem reactions.

  • bi functional nh2 mil 101 fe for one pot tandem photo oxidation knoevenagel condensation between Aromatic Alcohols and active methylene compounds
    Catalysis Science & Technology, 2015
    Co-Authors: Dengke Wang, Zhaohui Li

    Abstract:

    Tandem reactions, which enable multistep reactions in one pot, offer enormous economical advantages. For the first time, this manuscript reported that NH2-MIL-101(Fe), an earth abundant Fe-containing MOF material, can catalyze efficiently the one-pot reaction between Aromatic Alcohols and active methylene compounds via a tandem photo-oxidation/Knoevenagel condensation under visible light and at room temperature. NH2-MIL-101(Fe) acts as a photocatalyst for the oxidation of Aromatic Alcohols to aldehydes as well as a base catalyst for Knoevenagel condensation between the as-formed aldehydes and the active methylene compounds. The comparison of the reactions over NH2-MIL-101(Fe) and another two MOFs (NH2-UiO-66(Zr) and NH2-MIL-125(Ti)) reveals that the strength of the basic sites in the MOFs influences significantly the efficiency of the tandem reaction. This study highlights the great potential of MOFs as multifunctional photocatalysts for one-pot tandem reactions.

Sedat Yurdakal – 3rd expert on this subject based on the ideXlab platform

  • Photocatalytic oxidation of Aromatic Alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide
    Applied Catalysis A: General, 2020
    Co-Authors: Vincenzo Augugliaro, Leonardo Palmisano, Giovanni Palmisano, Vittorio Loddo, Horst Kisch, María José López-muñoz, Carlos Márquez-Álvarez, Francesco Parrino, 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

  • Partial oxidation of Aromatic Alcohols via TiO2 photocatalysis: the influence of substituent groups on the activity and selectivity
    RSC Advances, 2012
    Co-Authors: Sedat Yurdakal, Vincenzo Augugliaro

    Abstract:

    Aromatic Alcohols with substituent groups in different positions have been partially oxidised to the corresponding aldehydes in a photocatalytic system in order to investigate the influence of the substituents on reactivity and selectivity to aldehyde. To this aim benzyl alcohol, 2-methoxybenzyl alcohol, 3-methoxybenzyl alcohol, 4-methoxybenzyl alcohol, 2,4-dimethoxybenzyl alcohol, 4-hydroxybenzyl alcohol and 4-hydroxy-3-methoxybenzyl alcohol have been photocatalytically oxidised to their corresponding aldehydes in aqueous TiO2 suspensions under near-UV irradiation. Home-made and commercial rutile TiO2 samples were used as photocatalysts. The catalysts were characterized by XRD, BET, SEM, TEM and TGA measurements. For all the used substrates the main oxidation products were the corresponding aldehydes and CO2. The Aromatic Alcohols showed selectivity values decreasing with the substituent position on the Aromatic ring according the following order: para > ortho > meta. In the presence of two substituent groups, the overall oxidation rate increased while the selectivity decreased. The home-made catalyst generally showed selectivity higher but activity lower than those of the commercial one. The results showed that the reaction rate and selectivity were dependent not only on the catalyst properties such as crystallinity and hydrophilicity but also on the kind and position of the substituent groups of the Aromatic Alcohols.

  • selective photocatalytic oxidation of 4 substituted Aromatic Alcohols in water with rutile tio2 prepared at room temperature
    Green Chemistry, 2009
    Co-Authors: Sedat Yurdakal, Giovanni Palmisano, Vittorio Loddo, Vincenzo Augugliaro, Oguzhan Alagoz, Leonardo Palmisano

    Abstract:

    Home-prepared (HP) rutile TiO2catalysts were prepared at room temperature by using H2O and TiCl4 in different ratios and without addition of additives. The catalysts were used for carrying out the selective photocatalytic oxidation of 4-methoxybenzyl alcohol to 4-methoxybenzaldehyde in aqueous suspension, free from any organic co-solvent. The selectivities showed by the home prepared catalysts were in the 45–74% range, up to four times higher than that of a commercial rutile TiO2 sample, the reaction rates being comparable. By using the most selective photocatalyst, the oxidation of benzyl, 4-methylbenzyl, and 4-nitrobenzyl Alcohols was also carried out in order to investigate the influence of the substituent group on the oxidation rate and selectivity. The presence of an –OCH3group positively influenced the selectivity whereas a –NO2group showed to have a detrimental effect. The Hammett relationship effectively describes the influence of substituent group on the kinetic constant of partial oxidation of Aromatic Alcohols to aldehydes.