不同载体负载Pd催化剂的苯甲醛加氢性能

Performance of palladium catalysts with different supports for the hydrogenation of benzaldehyde

研究了氧化物载体及惰性载体,如碳化硅(SiC)、氮化硅(Si3N4)及高温脱氧活性炭载体(AC-1100)负载Pd催化剂上的液相苯甲醛(BAL)加氢制苯甲醇反应性能。结果表明,酸性载体氧化铝及碱性载体氧化镁负载的Pd催化剂,苯甲醛与醇类溶剂在载体表面吸附,并缩合生成缩醛。而在惰性载体如二氧化硅(SiO2)、SiC、Si3N4及AC-1100载体表面,则可以避免此副反应,有利于保持Pd粒子的金属态,从而获得较高的苯甲醇(BAOL)选择性。Si3N4在保持较高活性的同时,具有最高的BAOL选择性。

The performance for the hydrogenation of benzaldhyde of palladium catalysts sup oxide supports or inert supports, such as SiC, Si3N4 and AC-1100 （deoxidized active carbon in the high temperature） were studied. The results showed that the benzaldhyde and other alcohol were likely to adsorb on the surface of the support and react to the acetal for palladium catalysts with acid support Al2O3 and alkaline support MgO. However, there are no such byproduct is detected for the palladium catalysts with inert supports such as SiO2 ,SiC,Si3N4 and AC-1100, and it was beneficial to keep palladium particles metallic state and exhibited high selectivity to BAOL. The palladium catalyst with Si3 N4 support exhibited the highest BAOL selectivity as well as a rather high activity .