The Experts below are selected from a list of 3600 Experts worldwide ranked by ideXlab platform
Yang Shui-jin - One of the best experts on this subject based on the ideXlab platform.
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Catalytic synthesis of Butyraldehyde glycol acetal by H_4SiW_(12)O_(40)/silica gel
Journal of Hubei Normal University, 2011Co-Authors: Yang Shui-jinAbstract:Butyraldehyde glycol acetal was synthesized from Butyraldehyde and glycol in the presence of H4SiW12O40/silica gel as catalyst.The factors influencing the synthesis were discussed and the best reaction conditions were found out.Experimental results showed that H4SiW12O40/silica gel is an excellent catalyst.The optimum conditions are: the quantity of catalyst is 0.3g,molar ratio of Butyraldehyde to glycol is 1∶1.5,the volume of cyclohexane as the water-carrying agent is 6 mL,and the reaction time is 45 min,the yield of its can reach 78.3 %.
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Synthesis of n-Butyraldehyde 1,2-propanediol acetal by using H_4SiW_6Mo_6O_(40)/PAn as catalyst
Journal of Shangqiu Teachers College, 2007Co-Authors: Yang Shui-jinAbstract:A new environmental friendly catalyst,H4SiW6Mo6O40/PAn was prepared and used for synthesizing n-Butyraldehyde 1,2-propanediol acetal.The influence factors of the synthesis were discussed and the best reaction conditions were found that the molar ratio of n-Butyraldehyde to 1,2-propanediol is 1∶1.7,the amount of catalyst used is 1.0% of feed stocks,and the reaction time is 40 min.H4SiW6Mo6O40/PAn is an excellent catalyst for synthesizing n-Butyraldehyde 1,2-propanediol acetal and the yield can reach over 78.5%.
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Catalytic synthesis of Butyraldehyde glycol acetal with H_3PW_6Mo_6O_(40)/TiO_2
Journal of Hubei Normal University, 2007Co-Authors: Yang Shui-jinAbstract:A new environmental friendly catalyst,H3PW6Mo6O40/TiO2 was prepared.The optimum conditions have been found,that is,mass ratio of m(TiO2): m(H3PW6Mo6O40) is 1/1.0,volume of water is 30mL,the soaked time is 12 h,and activated temperature is 150 ℃.H3PW6Mo6O40/TiO2 was used as catalyst in catalytic synthesis of Butyraldehyde glycol acetal.Effects of n(benzaldehyde)∶n(glycol),catalyst dosage and reaction time on yield were investigated.Optimal conditions were: n(Butyraldehyde)∶n(glycol)=1.0∶1.4;mass fraction of catalyst to reactants,0.8%;reaction time,1.5 h and cyclohexane as water-stripped reagent,8 mL.Under these conditions,yield of Butyraldehyde glycol acetal was 51.3%.
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Catalytic Synthesis of n-Butyraldehyde 1,2-propanediol Acetal over H4SiW12O40-PAn
Frontiers of Chemistry in China, 2006Co-Authors: Yang Shui-jin, Shi Shaomin, Yu XieqingAbstract:A new environmentally friendly catalyst, H4SiW12O40-polyaniline (PAn), was prepared, and n-Butyraldehyde 1,2-propanediol acetal was synthesized from n-Butyraldehyde and 1,2-propanediol in the presence of H4SiW12O40-PAn. The influence factors of the synthesis were discussed, and the best reaction conditions were found: the molar ratio of n-Butyraldehyde to 1,2-propanediol is 1:1.5, the amount of catalyst used is 1.2% of feed stock, and the reaction time is 1.0 h. H4SiW12O40-PAn is an excellent catalyst for synthesizing n-Butyraldehyde 1,2-propanediol acetal, and the yield can reach more than 95.2%.
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Catalytic synthesis of n-Butyraldehyde 1,2-propanediol acetal over H_4SiW_(12)O_(40)-PAn
Journal of Central China Normal University, 2005Co-Authors: Yang Shui-jinAbstract:A new environmental friendly catalyst, H_4SiW_(12)O_(40)-PAn was prepared and used for n-Butyraldehyde 1,2-propanediol acetal synthesis from n-Butyraldehyde and 1,2-propanediol. The influence factors of the synthesis were discussed and the best reaction conditions were found that the molar ratio of n-Butyraldehyde to 1,2-propanediol is 1∶1.5, the amount of catalyst used is 1.2% of feed stocks, and the reaction time is (1.0 h). H_4SiW_(12)O_(40)-PAn is an excellent catalyst for synthesizing n-Butyraldehyde 1,2-propanediol acetal and the yield can reach over 95.2%.
Yu Chuan Lin - One of the best experts on this subject based on the ideXlab platform.
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Kinetics of n-Butanol Partial Oxidation to Butyraldehyde over Lanthanum–Transition Metal Perovskites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Bing Shiun Jiang, Ray Chang, Yi Chen Hou, Yu Chuan LinAbstract:Partial oxidation of butanol to Butyraldehyde over a series of LaBO3 (B = Mn, Fe, and Co) perovskites was investigated in a continuous fixed-bed system under ambient pressure. Physicochemical properties of catalysts were characterized by X-ray diffraction, H2 temperature-programmed reduction, and temperature-programmed oxidation. LaMnO3 was more favorable to be reduced and reoxidized than LaFeO3 and LaCoO3. Catalytic results have indicated that all catalysts show similar butanol and oxygen conversions and over 90% Butyraldehyde selectivities below 300 °C. Side reactions such as butanol or Butyraldehyde combustion could be enhanced at high temperatures. To gain an in-depth understanding of perovskite’s chemistry involved, kinetic analysis has been carried out. Eight reaction pathways based on the Mars–van Krevelen redox cycle were proposed. These pathways have been lumped and associated with the Langmuir–Hinshelwood–Hougen–Watson formalism to derive a set of rate equations. Parameter estimation via nonline...
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kinetics of n butanol partial oxidation to Butyraldehyde over lanthanum transition metal perovskites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Bing Shiun Jiang, Ray Chang, Yi Chen Hou, Yu Chuan LinAbstract:Partial oxidation of butanol to Butyraldehyde over a series of LaBO3 (B = Mn, Fe, and Co) perovskites was investigated in a continuous fixed-bed system under ambient pressure. Physicochemical properties of catalysts were characterized by X-ray diffraction, H2 temperature-programmed reduction, and temperature-programmed oxidation. LaMnO3 was more favorable to be reduced and reoxidized than LaFeO3 and LaCoO3. Catalytic results have indicated that all catalysts show similar butanol and oxygen conversions and over 90% Butyraldehyde selectivities below 300 °C. Side reactions such as butanol or Butyraldehyde combustion could be enhanced at high temperatures. To gain an in-depth understanding of perovskite’s chemistry involved, kinetic analysis has been carried out. Eight reaction pathways based on the Mars–van Krevelen redox cycle were proposed. These pathways have been lumped and associated with the Langmuir–Hinshelwood–Hougen–Watson formalism to derive a set of rate equations. Parameter estimation via nonline...
Yanji Wang - One of the best experts on this subject based on the ideXlab platform.
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preparation and catalytic performance of nio mno2 nb2o5 tio2 for one step synthesis of 2 ethylhexanol from n Butyraldehyde
Catalysis Communications, 2021Co-Authors: Jiaxun Zhang, Xinqiang Zhao, Yanji WangAbstract:Abstract One-pot synthesis of 2-ethylhexanol(2EHO) from n-Butyraldehyde is of commercialimportance. The promotion of 2EHO selectivity requires suppressing direct hydrogenation of n-Butyraldehyde. In this work, a series of NiO-MOx/Nb2O5-TiO2 catalysts were prepared and utilized by means of reduction-in-reaction technique, aiming at delaying the formation of metal sites and suppressing the direct hydrogenation. NiO-MnO2/Nb2O5-TiO2 with a Ni/Mn mass ratio of 10 and NiO-MnO2 loading of 14.3 wt% shows the best catalytic performance; 2-EHO selectivity could reach 90.0% at a complete conversion of n-Butyraldehyde. Furthermore the catalyst could be used for four times without a substantial change in its catalytic performance.
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Preparation and catalytic performance of NiO-MnO2/Nb2O5-TiO2 for one-step synthesis of 2-ethylhexanol from n-Butyraldehyde
Catalysis Communications, 2021Co-Authors: Jiaxun Zhang, Xinqiang Zhao, Yanji WangAbstract:Abstract One-pot synthesis of 2-ethylhexanol(2EHO) from n-Butyraldehyde is of commercialimportance. The promotion of 2EHO selectivity requires suppressing direct hydrogenation of n-Butyraldehyde. In this work, a series of NiO-MOx/Nb2O5-TiO2 catalysts were prepared and utilized by means of reduction-in-reaction technique, aiming at delaying the formation of metal sites and suppressing the direct hydrogenation. NiO-MnO2/Nb2O5-TiO2 with a Ni/Mn mass ratio of 10 and NiO-MnO2 loading of 14.3 wt% shows the best catalytic performance; 2-EHO selectivity could reach 90.0% at a complete conversion of n-Butyraldehyde. Furthermore the catalyst could be used for four times without a substantial change in its catalytic performance.
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Chitosan-catalyzed n-Butyraldehyde self-condensation reaction mechanism and kinetics
Chinese Journal of Chemical Engineering, 2019Co-Authors: Xiaoxu Han, Xinqiang Zhao, Yanji WangAbstract:Abstract The chitosan was found to possess an excellent catalytic performance in n-Butyraldehyde self-condensation to 2E2H. Under suitable conditions, the conversion of n-Butyraldehyde, the yield and selectivity of 2E2H separately attained 96.0%, 86.0% and 89.6%. The chitosan catalyst could be recovered and used for 5 times without a significant deactivation after being treated with ammonium hydroxide. In order to elucidate the reaction mechanism, the adsorption and desorption of n-Butyraldehyde on the surface of chitosan were studied using in situ FT-IR spectroscopy analysis. The result showed that n-Butyraldehyde interacts with NH2 group of chitosan to form an intermediate species with an enamine structure. Then the reaction process of n-Butyraldehyde self-condensation was monitored by React-IR technique and it was found that n-Butyraldehyde self-condensation to 2-ethyl-3-hydroxyhexanal followed by a dehydration reaction to 2-ethyl-2-hexenal. On this basis, chitosan-catalyzed n-Butyraldehyde self-condensation reaction mechanism was speculated and its reaction kinetics was investigated. The self-condensation reaction follows auto-catalytic reaction characteristics and then the corresponding kinetic model was established.
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One-Pot Sequential Aldol Condensation and Hydrogenation of n-Butyraldehyde to 2-Ethylhexanol
Industrial & Engineering Chemistry Research, 2016Co-Authors: Xiaohong Liu, Xinqiang Zhao, Yanji WangAbstract:2-Ethylhexanol (2EHO) is an important organic chemical. The industrial production of 2EHO comprises three units: propylene hydroformylation to n-Butyraldehyde, n-Butyraldehyde self-condensation to 2-ethyl-2-hexenal (2E2H), and 2E2H hydrogenation to 2EHO. In the present work, 2EHO was synthesized by one-pot sequential aldol condensation and hydrogenation of n-Butyraldehyde. Among a series of metal–solid acid bifunctional catalysts, Ni/La–Al2O3 showed a better catalytic performance. The effect of reaction conditions on the one-pot sequential synthesis of 2EHO catalyzed by Ni/La–Al2O3 was investigated, and the suitable reaction conditions were obtained as follows: weight percentage of Ni/La–Al2O3 = 15%, self-condensation reaction conducted at 180 °C for 8 h, and then hydrogenation reaction conducted at 180 °C for 6 h under 4 MPa H2 pressure. Under the above reaction conditions, n-Butyraldehyde conversion attained 100% at a 2EHO selectivity of 67.0%. The inhibition of Ni to n-Butyraldehyde self-condensation r...
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n-Butyraldehyde self-condensation catalyzed by Ce-modified γ-Al2O3
RSC Advances, 2015Co-Authors: Chao Xiong, Xinqiang Zhao, Ning Liang, Yanji WangAbstract:Self-condensation of n-Butyraldehyde is an important process for the industrial production of 2-ethylhexanol. The catalytic performance of some solid acids such as γ-Al2O3 and molecular sieves for the self-condensation of n-Butyraldehyde was investigated and the results showed that γ-Al2O3 was the best one. Then the effect of preparation conditions on the catalytic performance of γ-Al2O3 and the effect of reaction conditions on the self-condensation of n-Butyraldehyde were discussed. In order to improve the catalytic performance, γ-Al2O3 was modified by different substances and Ce–Al2O3 was found to show the best catalytic performance; the conversion of n-Butyraldehyde and the yield of 2-ethyl-2-hexenal could reach 93.8% and 88.6%, respectively. Moreover, the Ce–Al2O3 catalyst had excellent reusability. The XPS analysis of Ce3d demonstrated that the valence state of cerium affected the catalytic performance of Ce–Al2O3 to some extent but not predominantly. Instead the acid–base property of Ce–Al2O3 played a dominant role in the catalytic performance. The reaction components formed over the Ce–Al2O3 catalyst were identified by GC-MS and then some side-reactions were speculated and a reaction network for n-Butyraldehyde self-condensation catalyzed by Ce–Al2O3 was proposed. Subsequently, the research on the intrinsic kinetics of n-Butyraldehyde self-condensation catalyzed by Ce–Al2O3 showed that both the forward and backward reactions are second order and the corresponding activation energy is separately 79.60 kJ mol−1 and 74.30 kJ mol−1, which is higher than that of the reaction catalyzed by an aqueous base or acid.
Bing Shiun Jiang - One of the best experts on this subject based on the ideXlab platform.
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Kinetics of n-Butanol Partial Oxidation to Butyraldehyde over Lanthanum–Transition Metal Perovskites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Bing Shiun Jiang, Ray Chang, Yi Chen Hou, Yu Chuan LinAbstract:Partial oxidation of butanol to Butyraldehyde over a series of LaBO3 (B = Mn, Fe, and Co) perovskites was investigated in a continuous fixed-bed system under ambient pressure. Physicochemical properties of catalysts were characterized by X-ray diffraction, H2 temperature-programmed reduction, and temperature-programmed oxidation. LaMnO3 was more favorable to be reduced and reoxidized than LaFeO3 and LaCoO3. Catalytic results have indicated that all catalysts show similar butanol and oxygen conversions and over 90% Butyraldehyde selectivities below 300 °C. Side reactions such as butanol or Butyraldehyde combustion could be enhanced at high temperatures. To gain an in-depth understanding of perovskite’s chemistry involved, kinetic analysis has been carried out. Eight reaction pathways based on the Mars–van Krevelen redox cycle were proposed. These pathways have been lumped and associated with the Langmuir–Hinshelwood–Hougen–Watson formalism to derive a set of rate equations. Parameter estimation via nonline...
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kinetics of n butanol partial oxidation to Butyraldehyde over lanthanum transition metal perovskites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Bing Shiun Jiang, Ray Chang, Yi Chen Hou, Yu Chuan LinAbstract:Partial oxidation of butanol to Butyraldehyde over a series of LaBO3 (B = Mn, Fe, and Co) perovskites was investigated in a continuous fixed-bed system under ambient pressure. Physicochemical properties of catalysts were characterized by X-ray diffraction, H2 temperature-programmed reduction, and temperature-programmed oxidation. LaMnO3 was more favorable to be reduced and reoxidized than LaFeO3 and LaCoO3. Catalytic results have indicated that all catalysts show similar butanol and oxygen conversions and over 90% Butyraldehyde selectivities below 300 °C. Side reactions such as butanol or Butyraldehyde combustion could be enhanced at high temperatures. To gain an in-depth understanding of perovskite’s chemistry involved, kinetic analysis has been carried out. Eight reaction pathways based on the Mars–van Krevelen redox cycle were proposed. These pathways have been lumped and associated with the Langmuir–Hinshelwood–Hougen–Watson formalism to derive a set of rate equations. Parameter estimation via nonline...
P. L. Arias - One of the best experts on this subject based on the ideXlab platform.
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Acetalization reaction between glycerol and n-Butyraldehyde using an acidic ion exchange resin. Kinetic modelling
Chemical Engineering Journal, 2013Co-Authors: M. Belen Guemez, J. Requies, P. L. Arias, Ion Agirre, V. Laura Barrio, J. F. CambraAbstract:Abstract The acetalization reaction between glycerol and n-Butyraldehyde using Amberlyst 47, an acidic ion exchange resin catalyst, was studied. These acetals can be obtained from renewable sources and seem to be good candidates for different applications such as oxygenated diesel additives. Amberlyst 47 acidic ion exchange showed good activity and stability after five consecutive cycles of reuse. Therefore, 100% of selectivity towards the formation of acetals and Butyraldehyde conversions between 92% and 98% were obtained for different molar feed ratios of glycerol:aldehyde. For glycerol:aldehyde molar ratios lower than the stoichiometric one, 2,4,6-tripropyl-1,2,3-trioxane is also detected as product when glycerol is almost totally consumed. Moreover, a pseudo-homogeneous kinetic model able to explain the reaction mechanism was adjusted and the corresponding overall reaction order was determined. The addition of around 15 wt% of water in the feed produces only a slight decrease in the Butyraldehyde conversion, and it improves the mixing and transport properties of the reaction mixture.
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Bio n-Butanol Partial Oxidation to Butyraldehyde in Gas Phase on Supported Ru and Cu Catalysts
Catalysis Letters, 2012Co-Authors: J. Requies, M. B. Güemez, A. Iriondo, V. L. Barrio, J. F. Cambra, P. L. AriasAbstract:Ceria, titania, and zirconia supported ruthenium and copper catalysts were tested in the Butyraldehyde production by gas phase n -butanol partial oxidation. These catalysts were characterized by means of N_2 adsorption–desorption isotherms, temperature-programmed reduction and X-ray photoelectron spectroscopy techniques. The activity tests were performed in a fixed bed reactor at 0.1 MPa and 623 K using air and n -butanol mixture as reactants (in stoichiometric proportion n -butanol/O_2) to generate Butyraldehyde. For n -butanol partial oxidation, the ruthenium catalysts showed higher activity and stability than the copper ones. The n -butanol conversion was almost similar for all the ruthenium catalysts, but the different supports modified the metal dispersion and, as a result, the product distribution was modified. The catalysts supported on ZrO_2 and CeO_2 allowed the highest Butyraldehyde yields. The copper doping of the ruthenium catalyst also improved the selectivity toward Butyraldehyde. Graphical Abstract
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Zirconia supported Cu systems as catalysts for n-butanol conversion to Butyraldehyde
Applied Catalysis A: General, 2012Co-Authors: J. Requies, M. B. Güemez, A. Iriondo, V. L. Barrio, J. F. Cambra, P. Maireles, P. L. AriasAbstract:Abstract A promising alternative for the production of Butyraldehyde is the use of n-butanol as raw material. This alcohol can be produced via fermentation from renewable resources. n-Butanol can be converted to Butyraldehyde by dehydrogenation or by partial oxidation and for both reactions Cu catalysts show activity. In this work, Cu supported on both pure ZrO2 and ZrO2 modified with CeO2 catalysts were studied in these two catalytic reactions. The catalytic performance and the catalysts characterization (ICP, N2-physisorption, XRD, TPR, and XPS) suggest that the catalyst with the best Cu dispersion was the most active and stable in n-butanol dehydrogenation. However, in n-butanol partial oxidation, the initial dispersion of Cu on the supports is deteriorated during the time on stream, being Cu sintering and oxidation the main causes of the lower Butyraldehyde yield observed in this catalytic process.
