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Dmitry Yu. Murzin - One of the best experts on this subject based on the ideXlab platform.

  • Aqueous phase Reforming of xylitol and xylose in the presence of formic acid
    Catalysis Science & Technology, 2020
    Co-Authors: Matias Alvear, Irina L. Simakova, Tapio Salmi, Atte Aho, Henrik Grénman, Dmitry Yu. Murzin
    Abstract:

    Aqueous phase Reforming (APR) of xylose and xylitol was studied over Pt/Pd catalysts supported on mesoporous carbon (Sibunit) in the temperature range 175–225 °C in a laboratory-scale packed bed reactor. Formic acid was introduced to the reaction mixture to simulate an industrial feedstock from the reactive extraction of hemicelluloses from biomass. The conversion was higher in xylose APR, however, xylitol APR displayed a higher selectivity to hydrogen and stable operation under the conditions investigated. Addition of formic acid increased the hydrogen production in the APR of xylitol, while xylose APR displayed an opposite behavior. The ratio of the gas and liquid products was similar for both substrates at an equal conversion, however, the alkane distribution was different, depending on the presence of formic acid and reaction temperature. It can be concluded that the APR of xylitol to hydrogen was successfully conducted with the selected catalyst in the presence of formic acid as a co-reactant.

  • Biohydrogen from dilute side streams - Influence of reaction conditions on the conversion and selectivity in aqueous phase Reforming of xylitol
    Biomass and Bioenergy, 2020
    Co-Authors: Atte Aho, Dmitry Yu. Murzin, Kari Eränen, Tapio Salmi, Carlos Rosales, Henrik Grénman
    Abstract:

    Abstract Aqueous phase Reforming (APR) can be used as an efficient method to purify and obtain added value from rather dilute side/waste streams of process waters containing e.g. alcohols or sugar alcohols. Such side streams often have none or even negative value due to purification costs, which contributes to the economy of the process. Xylitol was here used as a model compound. The desired product in the current study was hydrogen, which can be used for valorizing by-products via hydroprocessing or as a bioenergy source. In addition to hydrogen, some alkanes were also obtained, which are prime sources of bio-energy for power production. The current work focused especially on the influence of the reaction conditions (temperature, pressure and inert gas flow) on the xylitol conversion and hydrogen selectivity, which has not been reported previously. The influence of reaction conditions on the aqueous phase Reforming of xylitol on Pt/Al2O3 catalyst was studied in a trickle-bed reactor. Selectivity to hydrogen was dependent on gas flow through the reactor, especially the absence of any gas resulted in a low selectivity. A higher reaction temperature and a higher inert gas flow gave a better xylitol conversion, while an increase of the overall pressure had an opposite effect on conversion. The activation energy for xylitol conversion was determined for the first time being 79.3 kJ/mol. The results demonstrate that aqueous phase Reforming is a viable method for energy efficient value added processing of sugar alcohol containing dilute side streams in modern bio-refinery applications.

  • Aqueous phase Reforming of alcohols over a bimetallic Pt-Pd catalyst in the presence of formic acid
    Chemical Engineering Journal, 2020
    Co-Authors: Matias Alvear, Irina L. Simakova, Tapio Salmi, Atte Aho, Henrik Grénman, Dmitry Yu. Murzin
    Abstract:

    Abstract Aqueous phase Reforming (APR) of four polyols (ethylene glycol, glycerol, erythritol and sorbitol) was studied over a bimetallic Pt/Pd catalyst supported on mesoporous carbon in the temperature range between 200 °C and 225 °C. Addition of formic acid was studied for a potential industrial application, which involves upstream reactive extraction of hemicelluloses. APR of all polyols resulted in high levels of hydrogen production, which could be even improved by a temperature increase and addition of formic acid. Selectivity to alkanes was similar for most of the polyols with methane and ethane being the most prominent product among alkanes. The liquid phase displayed presence of significant amounts of methanol and propane diols. Analysis of the liquid products suggests a strong interrelation between the reaction pathways in APR of tested polyols.

  • Hydrogen production from sucrose via Aqueous-Phase Reforming
    International Journal of Hydrogen Energy, 2019
    Co-Authors: Lidia I Godina, Hans Heeres, Sonia Garcia, Steve Bennett, Stephen Poulston, Dmitry Yu. Murzin
    Abstract:

    Abstract Commercial sucrose was used to produce hydrogen in a combined approach of hydrogenation and aqueous phase Reforming (APR). First a mixture of technical sorbitol/mannitol was produced by hydrogenating an aqueous solution of sucrose in a trickle bed reactor over 5 wt % Ru/C. The produced polyols were treated in a continuous reactor at 498 K and elevated pressure deploying a 2.5 wt % Pt/C catalyst to yield hydrogen. The highest hydrogen selectivity was 62%. No large differences were found when comparing a commercial available sorbitol to the technical sorbitol/mannitol mixture in terms of conversion levels and selectivity to the gas-phase products. This was accompanied by a similar distribution of products retained in the liquid phase. The efficiency of APR when utilizing Pt/C was found to be still insufficient for industrial implementation in terms of hydrogen production. Thus, additional efforts should be made to increase the obtained amounts of hydrogen per mole of converted sugar alcohols.

  • Sibunit-Supported Mono- and Bimetallic Catalysts Used in Aqueous-Phase Reforming of Xylitol
    Industrial & engineering chemistry research, 2018
    Co-Authors: Lidia I Godina, Alexey Kirilin, Anton V. Tokarev, Irina L. Simakova, Dmitry Yu. Murzin
    Abstract:

    Carbon-supported mono- and bimetallic catalysts prepared via incipient wetness impregnation were systematically studied in Aqueous-Phase Reforming (APR) of xylitol aiming at hydrogen production fro...

Alexey Kirilin - One of the best experts on this subject based on the ideXlab platform.

  • Sibunit-Supported Mono- and Bimetallic Catalysts Used in Aqueous-Phase Reforming of Xylitol
    Industrial & engineering chemistry research, 2018
    Co-Authors: Lidia I Godina, Alexey Kirilin, Anton V. Tokarev, Irina L. Simakova, Dmitry Yu. Murzin
    Abstract:

    Carbon-supported mono- and bimetallic catalysts prepared via incipient wetness impregnation were systematically studied in Aqueous-Phase Reforming (APR) of xylitol aiming at hydrogen production fro...

  • Kinetics, Modeling, and Process Design of Hydrogen Production by Aqueous Phase Reforming of Xylitol
    Industrial & Engineering Chemistry Research, 2017
    Co-Authors: Dmitry Yu. Murzin, Lidia I Godina, Alexey Kirilin, Anton V. Tokarev, Irina L. Simakova, Sonia Garcia, Stephen Poulston, Vincenzo Russo, Teuvo Kilpiö, Dmitry A. Sladkovskiy
    Abstract:

    The present study was focused on kinetic investigation of xylitol aqueous phase Reforming with 2.5%Pt/C catalyst in a fixed bed reactor. For kinetic modeling, a complex reaction network was taken into account considering the formation of not only hydrogen and CO2 but also a range of alkanes in various side reactions. Parameter investigation revealed an adequate description of the experimental data. The influence of mass transfer was elucidated by exploring the parameter space of diffusion and mass transfer coefficients as well as Peclet numbers. Aspen HYSYS software was used to design a hydrogen production plant with 500 kg/h capacity operating with xylitol as a feedstock. Heat consumption of the designed process can be fully covered by heat generated by combusting alkanes formed during APR reaction.

  • aqueous phase Reforming of industrially relevant sugar alcohols with different chiralities
    ACS Catalysis, 2015
    Co-Authors: Lidia I Godina, Alexey Kirilin, Anton V. Tokarev, Dmitry Yu. Murzin
    Abstract:

    The influence of substrate chirality was studied in the aqueous phase Reforming (APR) over Pt/Al2O3 in a continuous fixed-bed reactor at 225 °C. Two epimeric sugar alcohols, namely sorbitol and galactitol, were used for performance comparison. For the very first time galactitol was used in the APR process. The reliability of the liquid-phase product analysis was considerably improved due to application of a spiking technique for qualitative analysis and subsequent peak fitting for quantification. A detailed analysis of the gas and liquid phases showed almost the same behavior of both polyols, apart from the formation of several intermediate oxygenates. This implies that industrially relevant feedstocks with different chiralities can be efficiently processed in APR, since the chirality of the initial substance does not affect the reaction rate and selectivity to the final products. However, the observed difference in the liquid phase composition should be considered, because the catalyst should be active i...

  • Kinetic Modeling of Sorbitol Aqueous-Phase Reforming over Pt/Al2O3
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Alexey Kirilin, Anton V. Tokarev, Johan Wärnå, Dmitry Yu. Murzin
    Abstract:

    Aqueous-Phase Reforming of polyols was investigated in the current work by mathematical modeling using sorbitol, which represents a C6-polyol originating from biomass processing. The reaction was studied in the presence of Pt/Al2O3 catalyst at 498 K and 29.3 bar in a continuous fixed-bed reactor under kinetic control. The feasible scheme describing main pathways of sorbitol transformation was proposed considering experimental and literature data. The kinetic model was compared with experimental data through numerical data fitting showing good correspondence.

  • Aqueous phase Reforming of xylitol over Pt-Re bimetallic catalyst : Effect of the Re addition
    Catalysis Today, 2014
    Co-Authors: Alexey Kirilin, Anton V. Tokarev, Jyri-pekka Mikkola, Tapio Salmi, Haresh Manyar, Christopher Hardacre, Dimitry Yu. Murzin
    Abstract:

    The aqueous phase Reforming (APR) of xylitol was studied in a continuous fixed bed reactor over three catalysts: Pt/Al2O3, Pt/TiO2 and Pt-Re/TiO2. The data obtained in the case of the monometallic Pt catalysts was compared to the bimetallic Pt-Re sample. The effect of Re addition on the catalyst stability, activity, product formation and selectivity toward hydrogen and alkanes was studied. The bimetallic catalyst demonstrated a higher selectivity to alkanes compared to the monometallic samples. The monometallic catalyst was more selective toward hydrogen formation. A plausible reaction scheme explaining differences in selectivity toward hydrogen and alkanes was proposed and discussed.

James A. Dumesic - One of the best experts on this subject based on the ideXlab platform.

  • Aqueous-Phase Reforming of oxygenated hydrocarbons over Sn-modified Ni catalysts
    Journal of Catalysis, 2004
    Co-Authors: John W. Shabaker, George W. Huber, James A. Dumesic
    Abstract:

    Abstract Reaction kinetics measurements were conducted for Aqueous-Phase Reforming of oxygenated hydrocarbons over Pt/Al 2 O 3 , Ni/Al 2 O 3 , NiSn/Al 2 O 3 , Raney-Ni, and Raney-NiSn catalysts at temperatures of 498 and 538 K. Raney-Ni, Raney-NiSn, and Pt/Al 2 O 3 catalysts display good stability with time on stream during Aqueous-Phase Reforming, whereas Al 2 O 3 -supported Ni and NiSn catalysts exhibit deactivation caused by sintering. Aqueous-Phase Reforming of sorbitol, glycerol, and ethylene glycol solutions produces an effluent gas stream composed of 50–70 mol% H 2 , 30–40 mol% CO 2 , and 2–11 mol% alkanes (dry basis) at high conversion. Addition of Sn to Ni improves the selectivity for production of H 2 by ethylene glycol Reforming from 35 to 51% at a Ni:Sn ratio of 270:1, while the alkane selectivity is reduced from 44 to 33%. At a Ni:Sn ratio of 14:1, the hydrogen selectivity increases to 90%, while alkane production is nearly eliminated. As the system pressure decreases to the bubble point of the feed (25.1 bar at 498 K), production of alkanes decreases and the hydrogen selectivity increases accordingly. Hydrogen selectivity is also maximized by operation at higher reactor space velocities. The addition of Sn to Ni significantly decreases the rate of methane formation from CO bond cleavage, while maintaining sufficiently high rates of CC bond cleavage required for hydrogen formation. Turnover frequencies for hydrogen production at 498 K over Raney-Ni-based catalysts are several times lower than that over 3 wt% Pt/Al 2 O 3 based on CO chemisorption. However, the high CO uptakes and high densities of Raney-Ni-based catalysts lead to comparable rates of hydrogen production per unit reactor volume as 3 wt% Pt/Al 2 O 3 at 498 K. Results from XRD, SEM, and 119 Sn Mossbauer spectroscopy suggest that Raney-NiSn catalysts comprise alumina and nickel particles surrounded by a Ni–Sn alloy. After exposure to reaction conditions, Sn is present primarily as Ni 3 Sn alloy with small amounts of Sn(IV) probably associated with alumina.

  • Kinetics of Aqueous-Phase Reforming of oxygenated hydrocarbons: Pt/Al2O3 and Sn-modified Ni catalysts
    Industrial & Engineering Chemistry Research, 2004
    Co-Authors: John W. Shabaker, James A. Dumesic
    Abstract:

    Reaction kinetics studies were conducted on the Aqueous-Phase Reforming of ethylene glycol to produce hydrogen at temperatures near 500 K over Pt/Al2O3 and Raney NiSn catalysts. Ethylene glycol Reforming proceeds through similar mechanisms over Pt and NiSn catalysts, involving initial dehydrogenation of ethylene glycol, followed by C−C bond cleavage and water−gas shift. The initial dehydrogenation of ethylene glycol appears to be kinetically significant over Pt/Al2O3, whereas the subsequent rate of C−C cleavage appears to be kinetically significant over R−Ni14Sn. The Reforming reaction is fractional order in the ethylene glycol concentration, because of the strong adsorption of the oxygenated reactant, and negative order in the system pressure, through product inhibition by adsorption of H2 and/or CO at high pressures. High selectivity for hydrogen production is achieved for gas-phase products over Pt/Al2O3, whereas the addition of Sn is necessary to avoid alkane formation by methanation over Ni-based cat...

  • aqueous phase Reforming of ethylene glycol on silica supported metal catalysts
    Applied Catalysis B-environmental, 2003
    Co-Authors: R. R. Davda, J W Shabake, George W Hube, Randy D Cortrigh, James A. Dumesic
    Abstract:

    Abstract Reaction kinetic studies were conducted for Aqueous-Phase Reforming of ethylene glycol over silica-supported Ni, Pd, Pt, Ru, Rh and Ir catalysts at temperatures of 483 and 498 K and at a total pressure of 22 bar. The rates of production of hydrogen, carbon dioxide, carbon monoxide, methane, ethane and higher paraffins were measured for conversion of an aqueous feed solution containing 10 wt.% ethylene glycol. It was observed that the overall catalytic activity for ethylene glycol Reforming, as measured by the rate of CO 2 production at 483 K, decreases in the following order for silica-supported metals: Pt∼Ni>Ru>Rh∼Pd>Ir. Silica supported Rh, Ru and Ni showed a low selectivity for production of H 2 and a high selectivity for alkane production. In addition, Ni/SiO 2 showed significant deactivation at the higher temperature of 498 K. Silica-supported Pt and Pd catalysts exhibited relatively high selectivities for production of H 2 , with low rates of alkane production. It appears that catalysts based on Pt and Pd may be promising materials for the selective production of hydrogen by Aqueous-Phase Reforming of oxygenated hydrocarbons, such as ethylene glycol.

  • Aqueous-Phase Reforming of Ethylene Glycol Over Supported Platinum Catalysts
    Catalysis Letters, 2003
    Co-Authors: John W. Shabaker, R. R. Davda, Randy D. Cortright, George W. Huber, James A. Dumesic
    Abstract:

    Aqueous-Phase Reforming of 10 wt% ethylene glycol solutions was studied at temperatures of 483 and 498 K over Pt-black and Pt supported on TiO_2, Al_2O_3, carbon, SiO_2, SiO_2-Al_2O_3, ZrO_2, CeO_2, and ZnO. High activity for the production of H_2 by Aqueous-Phase Reforming was observed over Pt-black and over Pt supported on TiO_2, carbon, and Al_2O_3 (i.e., turnover frequencies near 8-15 min^-1 at 498 K); moderate catalytic activity for the production of hydrogen is demonstrated by Pt supported on SiO_2-Al_2O_3 and ZrO_2 (turnover frequencies near 5 min^-1); and lower catalytic activity is exhibited by Pt supported on CeO_2, ZnO, and SiO_2 (H_2 turnover frequencies lower than about 2 min^-1). Pt supported on Al_2O_3, and to a lesser extent ZrO_2, exhibits high selectivity for production of H_2 and CO_2 from Aqueous-Phase Reforming of ethylene glycol. In contrast, Pt supported on carbon, TiO_2, SiO_2-Al_2O_3 and Pt-black produce measurable amounts of gaseous alkanes and liquid-phase compounds that would lead to alkanes at higher conversions (e.g., ethanol, acetic acid, acetaldehyde). The total rate of formation of these byproducts is about 1-3 min^-1 at 498 K. An important bifunctional route for the formation of liquid-phase alkane-precursor compounds over less selective catalysts involves dehydration reactions on the catalyst support (or in the aqueous Reforming solution) followed by hydrogenation reactions on Pt.

  • aqueous phase Reforming of methanol and ethylene glycol over alumina supported platinum catalysts
    Journal of Catalysis, 2003
    Co-Authors: J W Shabake, R. R. Davda, George W Hube, Randy D Cortrigh, James A. Dumesic
    Abstract:

    The rates of Aqueous-Phase Reforming of methanol and ethylene glycol to form H2 and CO2 were measured under kinetically controlled reaction conditions at temperatures of 483 and 498 K over alumina-supported platinum catalysts. Results show that the rates of formation of H2 from aqueous solutions of methanol (from 1 to 10 wt%) are similar to the rates of conversion of ethylene glycol, suggesting that CC bond cleavage is not rate limiting for ethylene glycol Reforming. Aqueous-Phase Reforming of both oxygenated hydrocarbons over Pt/Al2O3 leads to nearly 100% selectivity for the formation of H2 (compared to the formation of alkanes), suggesting that methanation or Fischer–Tropsch reactions involving CO/CO2 and H2 do not appear to be important over platinum-based catalysts under the conditions of the present study. The rate of production of hydrogen is higher order in methanol (0.8) compared to ethylene glycol (0.3–0.5), and the reaction is weakly inhibited by hydrogen (−0.5 order) for both feedstocks. The rates of Aqueous-Phase Reforming of methanol and ethylene glycol show apparent activation barriers of 140 and 100 kJ/mol, respectively, from 483 K and 22.4 bar total pressure to 498 K and 29.3 bar total pressure. Low levels of CO (<300 ppm) are detected in the gaseous effluents from Aqueous-Phase Reforming of methanol and ethylene glycol over alumina-supported Pt catalysts, suggesting that water–gas shift processes are operative under the Aqueous-Phase Reforming conditions of this study. The observed reaction kinetics for ethylene glycol of this study can be explained by a reaction scheme involving quasi-equilibrated adsorption of ethylene glycol, water, H2, and CO2, combined with irreversible steps involving dehydrogenation of adsorbed ethylene glycol to form adsorbed C2O2 species, cleavage of the CC bond to form adsorbed CO species, further dehydrogenation leading to adsorbed CO∗, and removal of adsorbed CO∗ by water-gas shift. Aqueous-Phase Reforming of methanol may take place by a similar reaction scheme, without the step involving cleavage of the CC bond. The nearly first-order reaction kinetics with respect to methanol can be explained by weaker adsorption of methanol compared to molecular adsorption of ethylene glycol.

Anton V. Tokarev - One of the best experts on this subject based on the ideXlab platform.

  • Sibunit-Supported Mono- and Bimetallic Catalysts Used in Aqueous-Phase Reforming of Xylitol
    Industrial & engineering chemistry research, 2018
    Co-Authors: Lidia I Godina, Alexey Kirilin, Anton V. Tokarev, Irina L. Simakova, Dmitry Yu. Murzin
    Abstract:

    Carbon-supported mono- and bimetallic catalysts prepared via incipient wetness impregnation were systematically studied in Aqueous-Phase Reforming (APR) of xylitol aiming at hydrogen production fro...

  • Aqueous-Phase Reforming of alcohols with three carbon atoms on carbon-supported Pt
    Catalysis Today, 2018
    Co-Authors: Lidia I Godina, Anton V. Tokarev, Irina L. Simakova, Päivi Mäki-arvela, Ewelina Kortesmäki, Jan Gläsel, Leif Kronberg, Bastian J. M. Etzold, Dmitry Yu. Murzin
    Abstract:

    Abstract Aqueous-Phase Reforming of propanol-1, propane-1,2-diol and glycerol was performed at 498 K and 29.7 bar in a continuous reactor with platinum supported on a polymer-derived carbon, as a catalyst. The number of hydroxyl groups of the reactant influenced the product distribution. An unexpectedly long stabilization period − more than 150 h of time-on-stream − was found to be an important feature of the catalyst.

  • Kinetics, Modeling, and Process Design of Hydrogen Production by Aqueous Phase Reforming of Xylitol
    Industrial & Engineering Chemistry Research, 2017
    Co-Authors: Dmitry Yu. Murzin, Lidia I Godina, Alexey Kirilin, Anton V. Tokarev, Irina L. Simakova, Sonia Garcia, Stephen Poulston, Vincenzo Russo, Teuvo Kilpiö, Dmitry A. Sladkovskiy
    Abstract:

    The present study was focused on kinetic investigation of xylitol aqueous phase Reforming with 2.5%Pt/C catalyst in a fixed bed reactor. For kinetic modeling, a complex reaction network was taken into account considering the formation of not only hydrogen and CO2 but also a range of alkanes in various side reactions. Parameter investigation revealed an adequate description of the experimental data. The influence of mass transfer was elucidated by exploring the parameter space of diffusion and mass transfer coefficients as well as Peclet numbers. Aspen HYSYS software was used to design a hydrogen production plant with 500 kg/h capacity operating with xylitol as a feedstock. Heat consumption of the designed process can be fully covered by heat generated by combusting alkanes formed during APR reaction.

  • aqueous phase Reforming of industrially relevant sugar alcohols with different chiralities
    ACS Catalysis, 2015
    Co-Authors: Lidia I Godina, Alexey Kirilin, Anton V. Tokarev, Dmitry Yu. Murzin
    Abstract:

    The influence of substrate chirality was studied in the aqueous phase Reforming (APR) over Pt/Al2O3 in a continuous fixed-bed reactor at 225 °C. Two epimeric sugar alcohols, namely sorbitol and galactitol, were used for performance comparison. For the very first time galactitol was used in the APR process. The reliability of the liquid-phase product analysis was considerably improved due to application of a spiking technique for qualitative analysis and subsequent peak fitting for quantification. A detailed analysis of the gas and liquid phases showed almost the same behavior of both polyols, apart from the formation of several intermediate oxygenates. This implies that industrially relevant feedstocks with different chiralities can be efficiently processed in APR, since the chirality of the initial substance does not affect the reaction rate and selectivity to the final products. However, the observed difference in the liquid phase composition should be considered, because the catalyst should be active i...

  • Kinetic Modeling of Sorbitol Aqueous-Phase Reforming over Pt/Al2O3
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Alexey Kirilin, Anton V. Tokarev, Johan Wärnå, Dmitry Yu. Murzin
    Abstract:

    Aqueous-Phase Reforming of polyols was investigated in the current work by mathematical modeling using sorbitol, which represents a C6-polyol originating from biomass processing. The reaction was studied in the presence of Pt/Al2O3 catalyst at 498 K and 29.3 bar in a continuous fixed-bed reactor under kinetic control. The feasible scheme describing main pathways of sorbitol transformation was proposed considering experimental and literature data. The kinetic model was compared with experimental data through numerical data fitting showing good correspondence.

Jyri-pekka Mikkola - One of the best experts on this subject based on the ideXlab platform.

  • Aqueous phase Reforming of xylitol over Pt-Re bimetallic catalyst : Effect of the Re addition
    Catalysis Today, 2014
    Co-Authors: Alexey Kirilin, Anton V. Tokarev, Jyri-pekka Mikkola, Tapio Salmi, Haresh Manyar, Christopher Hardacre, Dimitry Yu. Murzin
    Abstract:

    The aqueous phase Reforming (APR) of xylitol was studied in a continuous fixed bed reactor over three catalysts: Pt/Al2O3, Pt/TiO2 and Pt-Re/TiO2. The data obtained in the case of the monometallic Pt catalysts was compared to the bimetallic Pt-Re sample. The effect of Re addition on the catalyst stability, activity, product formation and selectivity toward hydrogen and alkanes was studied. The bimetallic catalyst demonstrated a higher selectivity to alkanes compared to the monometallic samples. The monometallic catalyst was more selective toward hydrogen formation. A plausible reaction scheme explaining differences in selectivity toward hydrogen and alkanes was proposed and discussed.

  • aqueous phase Reforming of xylitol and sorbitol comparison and influence of substrate structure
    Applied Catalysis A-general, 2012
    Co-Authors: Alexey Kirilin, Anton V. Tokarev, Jyri-pekka Mikkola, L M Kustov, Tapio Salmi, Dmitry Yu. Murzin
    Abstract:

    The behavior of abundant polyol stemming from hemicelluloses, xylitol, was investigated in the aqueous phase Reforming (APR) over supported Pt/Al2O3. The data obtained in the case of xylitol was co ...

  • reaction products and transformations of intermediates in the aqueous phase Reforming of sorbitol
    Chemsuschem, 2010
    Co-Authors: Alexey Kirilin, Anton V. Tokarev, Elena V. Murzina, Jyri-pekka Mikkola, L M Kustov, Dmitry Yu. Murzin
    Abstract:

    Aqueous phase Reforming of sorbitol over Pt supported on an alumina catalyst is investigated, in order to identify the intermediates involved in the transformation of the initial feed. Parameters such as the sorbitol feed rate and temperature are studied. To identify the intermediates, an approach based on analysis of the gas and liquid phases as well as the total carbon content was developed. According to analysis by gas chromatography combined with mass spectrometry of volatile substances collected with solid-phase microextraction, over 260 compounds are involved in the transformation of sorbitol. Of these, 50 of the major products are identified with high reliability. It is shown that a great variety of compounds, bearing different functionalities, form part of the reaction network. The formation of the majority of identified compounds is explained and a reaction network for the formation of sorbitol and intermediate molecules transformation is proposed.

  • Reaction Products and Transformations of Intermediates in the Aqueous‐Phase Reforming of Sorbitol
    ChemSusChem, 2010
    Co-Authors: Alexey Kirilin, Anton V. Tokarev, Elena V. Murzina, Leonid M. Kustov, Jyri-pekka Mikkola, Dmitry Yu. Murzin
    Abstract:

    Aqueous phase Reforming of sorbitol over Pt supported on an alumina catalyst is investigated, in order to identify the intermediates involved in the transformation of the initial feed. Parameters such as the sorbitol feed rate and temperature are studied. To identify the intermediates, an approach based on analysis of the gas and liquid phases as well as the total carbon content was developed. According to analysis by gas chromatography combined with mass spectrometry of volatile substances collected with solid-phase microextraction, over 260 compounds are involved in the transformation of sorbitol. Of these, 50 of the major products are identified with high reliability. It is shown that a great variety of compounds, bearing different functionalities, form part of the reaction network. The formation of the majority of identified compounds is explained and a reaction network for the formation of sorbitol and intermediate molecules transformation is proposed.

  • The role of bio-ethanol in aqueous phase Reforming to sustainable hydrogen
    International Journal of Hydrogen Energy, 2010
    Co-Authors: Anton V. Tokarev, Alexey Kirilin, Elena V. Murzina, Kari Eränen, Leonid M. Kustov, D. Yu. Murzin, Jyri-pekka Mikkola
    Abstract:

    Aqueous Phase Reforming (APR) has during the recent years emerged as a potent, alternative means of processing raw materials of biological origin to component suitable as chemicals and fuel compone ...