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Title: Selective hydrogenation of crotonaldehyde over supported Ir catalysts: Effect of surface acidity on catalyst deactivation
Authors: Hong, Xiao
Lu, Ji-qing
Li, Bo
Jin, Ling-yun
Hu, Geng-shen
Wang, Yue-juan
Luo, Meng-fei
Keywords: Catalysts;Supported catalyst;Iridium;Hydrogenation;Selective hydrogenation;Impregnation method;Oxides;Aldehydes;Unsaturated aldehydes;Alcohols;Crotonaldehyde;Crotyl alcohol
Issue Date: 4-Jan-2013
Abstract: Ir catalysts supported on various oxides (TiO2, ZrO2, CeO2, SnO2, and La2O3) have been prepared by an impregnation method and applied for selective hydrogenation of crotonaldehyde. It is found that the catalytic behavior strongly depends on the surface acidity of the catalysts. The highest activity and selectivity are obtained on the Ir/TiO2 catalyst, with a crotonaldehyde conversion of 43.2% and a selectivity to crotyl alcohol of 80.9% at 80 oC. Also, all the catalysts are deactivated during the reaction due to polymeriation of crotonaldehyde molecules on the surface of the catalysts, as evidenced by FTIR data and temperature-programmed oxidation of the spent catalysts. It is also found that the deactivation rates are related to the amount of surface acid sites on the catalysts. The Ir/CeO2 catalyst with the highest amount of surface acid sites is deactivated more rapidly than the Ir/La2O3 catalyst with the lowest amount of surface acid sites.
Page(s): 28-33
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.52A(01) [January 2013]

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