肉桂醛选择性催化氢化制备3-苯丙醛

Preparation of 3-phenylpropionaldehyde from cinnamaldehyde by selectively catalytic Hydrogenation

以Ni（NO3）2·6H2O作为前驱物浸渍法制备的负载镍催化剂用于肉桂醛的选择性催化氢化制备苯丙醛，通过对载体粒度、载体种类、Ni负载量、催化剂用量、反应温度和反应压力等影响因素的考察，确定了肉桂醛催化氢化制备苯丙醛的工艺条件为：10％Ni／SiO2催化剂（60—80目）的用量为15％（以肉桂醛投料计）；氢压为2．0MPa；反应温度为368K；反应时间为120～150min．在此工艺条件下肉桂醛的转化率99．3％～99．7％，3-苯丙醛的选择性93．8％～94．9％．而且，10％Ni／SiO2催化剂经五次重复使用其催化活性未出现衰减．

The preparation of 3-phenylpropionaldehyde from cinnamaldehyde by selectively catalytical hydrogenation in the presence of Ni/SiO2 catalyst prepared from Ni（NO3）2·6H2O was studied. The effects of the type and Granularity of support, Ni loading, the amount of catalyst, reaction temperature and reaction pressure on synthesis of 3-Phenylpropionaldehyde were investigated. The optimum reaction conditions are as followed： amount of 10% Ni/SiO2 catalyst （60-80 mesh） is 15% of Cinnamaldehy, reaction pressure is 2. 0 MPa, reaction temperature is 368 K and reaction time is 120-150min. Under the selected reaction conditions, the conversion of cinnamaldehyde and selectivity of 3-Phenylpropionaldehyde were 99. 3% 99.7% and 93. 8% -94. 9%, respectively. Moreover, the Catalyst activity of 10%Ni/SiO2 Catalyst used five-time was not deactivity.