TY - JOUR
T1 - Hydrogenation of (–)-carvone in presence of gold catalysts: role of the support
AU - S. Demidova, Yu
AU - V. Simakov, A.
AU - L. Simakova, I.
AU - Murzin, Dmitry
N1 - tk.
Original Russian Text © Yu.S. Demidova, A.V. Simakov, I.L. Simakova, D.Yu. Murzin, 2017, published in Kataliz v Promyshlennosti.
PY - 2018
Y1 - 2018
N2 - The liquid phase hydrogenation of biomass derived (–)-carvone into industrially valuable dihydrocarvone was studied over monometallic Au catalysts supported on alumina, titania and zirconia, as well as on the mesoporous carbon support Sibunit in methanol as a solvent (100°C, hydrogen pressure 9 bar). It was shown that among the three types of functional groups present in carvone, which can be hydrogenated, namely C=O, conjugated and isolated C=C groups, hydrogenation of the latter was predominant. The catalytic activity was found to depend on the catalyst support type. Under comparative reaction conditions, the carvone conversion increased in the following sequence: Au/C ≪Au/ZrO2 < Au/Al2O3 ≪Au/TiO2. A higher activity of Au catalysts over metal oxides as compared to Au/C can be caused by the presence of acid sites as well as oxygen vacancies in their structure allowing strong adsorption of carvone through its carbonyl moiety. All catalysts supported on oxides showed similar selectivity towards trans- and cis-dihydrocarvone with the ratio between isomers (trans-/cis-isomer) being about 1.8, while this value for Au/C was close to 3.9, which can be related to a much lower carvone conversion in the latter case.
AB - The liquid phase hydrogenation of biomass derived (–)-carvone into industrially valuable dihydrocarvone was studied over monometallic Au catalysts supported on alumina, titania and zirconia, as well as on the mesoporous carbon support Sibunit in methanol as a solvent (100°C, hydrogen pressure 9 bar). It was shown that among the three types of functional groups present in carvone, which can be hydrogenated, namely C=O, conjugated and isolated C=C groups, hydrogenation of the latter was predominant. The catalytic activity was found to depend on the catalyst support type. Under comparative reaction conditions, the carvone conversion increased in the following sequence: Au/C ≪Au/ZrO2 < Au/Al2O3 ≪Au/TiO2. A higher activity of Au catalysts over metal oxides as compared to Au/C can be caused by the presence of acid sites as well as oxygen vacancies in their structure allowing strong adsorption of carvone through its carbonyl moiety. All catalysts supported on oxides showed similar selectivity towards trans- and cis-dihydrocarvone with the ratio between isomers (trans-/cis-isomer) being about 1.8, while this value for Au/C was close to 3.9, which can be related to a much lower carvone conversion in the latter case.
KW - Chemical Engineering
KW - Chemical Engineering
KW - Chemical Engineering
U2 - 10.1134/S2070050418020058
DO - 10.1134/S2070050418020058
M3 - Artikel
SN - 2070-0504
VL - 10
SP - 159
EP - 165
JO - Catalysis in Industry
JF - Catalysis in Industry
IS - 2
ER -