蒽醌加氢钯催化剂载体改性研究  

Researches on support modification of palladium catalyst for anthraquinone hydrogenation

作　　者：李梦晨[1,2] 姚志龙[3,2] 李季伟[1,2] 孙培永[3,2] 张胜红[3,2] 

机构地区：[1]北京化工大学,北京100029 [2]恩泽生物质精细化工实验室(北京市重点实验室),北京102617 [3]北京石油化工学院,北京102617

出　　处：《工业催化》2014年第8期614-617,共4页Industrial Catalysis

摘　　要：针对Pd/Al2O3催化剂载体的改性进行研究,将1 000℃焙烧后的氧化铝粉末与未焙烧的活性氧化铝粉末按不同比例混合和焙烧制备载体,采用等体积浸渍法制得负载Pd的Pd/Al2O3催化剂。采用XRD、BET、NH3-TPD和HOT对载体以及催化剂进行表征,并考察催化剂的蒽醌加氢性能。结果表明,提高载体中焙烧后氧化铝粉末的比例,导致载体中γ-Al2O3减少和δ-Al2O3增多,载体酸性降低,Pd分散度变大,从而提高了催化剂氢化效率。当焙烧后氧化铝质量分数为40%时,分散度和活性表面积达到最大,晶粒度最小,氢化效率最高,催化活性最佳。The support modification of Pd/Al2O3 catalysts was focused on. The support was prepared by mixing activated alumina powder calcined at 1 000 ℃ and activated alumina powder without calcination in different proportion and calcining. Pd/Al2O3 catalysts were prepared by impregnation method and their performance for anthraquinone hydrogenation was evaluated. The supports and Pd/Al2O3 catalysts were characterized by XRD, BET, NH3-TPD and H2-O2 titration. The results showed that when the proportion of calcined alumina powder in the support was increased, γ-Al2O3 decreased and 8-Al2O3 increased in the support, which resulted in reduction of the support acidity, improvement of Pd dispersion on the catalyst and enhancement of the hydrogenation efficiency of the catalyst. When the mass fraction of calcined alumina was 40%, Pd dispersion and active surface of Pd/Al2O3 catalyst reached maximum, its crystal size was minimum, and the hydrogenation efficiency and catalytic activity of Pd/Al2O3 catalyst were the best.

关 键 词：催化化学 蒽醌法 过氧化氢 氧化铝载体 Pd分散度 PD催化剂 

分 类 号：O643.36[理学—物理化学] TQ426.65[理学—化学]