Steric effects in the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol using an Ir/C catalyst
Steric effects in the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol using an Ir/C catalyst
复制标题
DOI：
10.1016/j.apcata.2004.04.002
复制
发表时间：
2004-08-10
影响因子：
5.5
通讯作者：
Hayes, M
中科院分区：
文献类型：
--
作者：
Breen, JP;Burch, R;Hayes, M
在石墨负载的铱催化剂上进行了肉桂醛液相选择性加氢制肉桂醇的反应。研究了温度、压力、反应物浓度、向原料中添加产物以及催化剂预还原等反应参数的影响。用氢气对催化剂进行原位预还原对肉桂醛的转化率以及催化剂对肉桂醇的选择性有非常显著的提高作用。对预还原催化剂的动力学分析表明，该反应对于肉桂醛是零级反应，对于氢气是一级反应。该反应遵循阿累尼乌斯行为，活化能为37 kJ/mol。对反应的详细分析表明，在肉桂醛转化率较低时，主要发生C=C双键加氢生成氢化肉桂醛的反应（
The liquid phase selective hydrogenation of cinnamaldehyde to cinnamyl alcohol has been carried out over a graphite-supported iridium catalyst. The effect of reaction parameters such as temperature, pressure, concentration of reactant, the effect of addition of product to the feed and pre-reduction of the catalyst were studied. In situ pre-reduction of the catalyst with hydrogen had a very significant enhancing effect on the conversion of cinnamaldehyde and selectivity of the catalyst to cinnamyl alcohol. Kinetic analysis of the pre-reduced catalyst showed that the reaction is zero order with respect to cinnamaldehyde and first order with respect to hydrogen. The reaction follows an Arrhenius behaviour with an activation energy of 37 kJ mol(-1). Detailed analysis of the reaction showed that hydrogenation of the C=C double bond to give hydrocinnamaldehyde predominantly occurred at low conversions of cinnamaldehyde (