Hydrogenation Of Ethyl Acetate Research Articles

Insight into the deactivation mechanism of water on active Cu species for ester hydrogenation: Experimental and theoretical study

Water is inevitably existed in the industrial production and counted as a critical issue; however, the effect of water on Cu/SiO2 catalysts was often ignored and the relation between of water and deactivation mechanism in the hydrogenation reaction is rarely studied. In this work, the effect of water on ester hydrogenation was investigated experimentally and theoretically. The hydrogenation of ethyl acetate was chosen as probe reaction and the reagent containing water was used to simulate industrial feedstock. The obtained experimental results of the hydrogenation and the in-situ DRIFT and DFT calculation have demonstrated that the presence of water is hardly affected ethanol selectivity but decreased the catalytic activity. The main reason for the showed catalyst deactivation is the competitive adsorption (reversible) mechanism of water and ethyl acetate molecules. More precisely, the active species of Cu+ surface is preferred the adsorption of H2O over ethyl acetate molecule consequently leads to a rapidly decreasing in the conversion ratio of ethyl acetate. Although the adsorption of water molecule is only occupied the Cu+ sites in the catalyst and could also release at reaction temperature, the conversion was partially recovered due to the growth, leaching and oxidation of copper species caused by water when water was removed.

Performance of SiO2–TiO2 Binary Oxides Supported Cu–ZnO Catalyst in Ethyl Acetate Hydrogenation to Ethanol

SiO2, TiO2, and SiO2–TiO2 binary oxides supported Cu–ZnO catalysts prepared by co-precipitation method were compared in the hydrogenation of ethyl acetate (EA) to ethanol (EtOH), and it shows the SiO2–TiO2 binary oxides supported Cu–ZnO catalyst has a larger catalytic activity over the unitary SiO2 or TiO2 supported ones. Comprehensive characterizations by N2 adsorption, X-ray diffraction, H2-temperature programmed reduction, transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray induced Auger electron spectroscopy reveal that Cu–ZnO/SiO2–TiO2 catalyst has an appropriate Cu0/Cu+ molar ratio of about 1 with highly dispersed copper species and strong metal-support interaction. Furthermore, the electron transfer from TiO2 to copper species can accelerate the activation of C=O and improve the catalytic performance. Under the optimized reaction conditions of P = 2.0 MPa, T = 523 K, WHSV = 0.5 h−1, and n(H2)/n(EA) = 20, the conversion of EA was up to 96% with EtOH selectivity of 99.5%.

Frontispiece: Unexpected Direct Hydride Transfer Mechanism for the Hydrogenation of Ethyl Acetate to Ethanol Catalyzed by SNS Pincer Ruthenium Complexes

Frontispiece: Unexpected Direct Hydride Transfer Mechanism for the Hydrogenation of Ethyl Acetate to Ethanol Catalyzed by SNS Pincer Ruthenium Complexes

Direct hydrogenation of biomass-derived butyric acid to n-butanol over a ruthenium-tin bimetallic catalyst.

Catalytic hydrogenation of organic carboxylic acids and their esters, for example, cellulosic ethanol from fermentation of acetic acid and hydrogenation of ethyl acetate is a promising possibility for future biorefinery concepts. A hybrid conversion process based on selective hydrogenation of butyric acid combined with fermentation of glucose has been developed for producing biobutanol. ZnO-supported Ru-Sn bimetallic catalysts exhibits unprecedentedly superior performance in the vapor-phase hydrogenation of biomass-derived butyric acid to n-butanol (>98% yield) for 3500 h without deactivation.

ChemInform Abstract: Hydrogenation of Ethyl Acetate over Supported Rhenium Catalysts.

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Evidence for the role of a “hydridic” hydrogen on the selective hydrogenation of ethyl acetate to ethanol with the bimetallic system Rh-Sn supported on silica

Evidence for the role of a “hydridic” hydrogen on the selective hydrogenation of ethyl acetate to ethanol with the bimetallic system Rh-Sn supported on silica

Correlation between hydrogenation activity and amount of adsorbed hydrogen species on Rh–Sn catalysts

On Rh–Sn catalysts the most strongly adsorbed hydrogen species is found to be associated with tin and directly related to the catalytic activity in the hydrogenation of ethyl acetate.