微乳液法制备Pt/Al_2O_3催化剂及其催化氯代硝基苯选择加氢活性  

Preparation of Pt/Al_2O_3 catalyst by microemulsion and its activity in selective hydrogenation of chloronitrobenzene

作　　者：宋华[1] 汪淑影[1] 李锋[1] 李瑞峰[2] 

机构地区：[1]东北石油大学化学化工学院,黑龙江大庆163318 [2]大庆化工研究中心,黑龙江大庆163714

出　　处：《化工进展》2011年第4期771-776,共6页Chemical Industry and Engineering Progress

摘　　要：采用十六烷基三甲基溴化铵(CTAB)/正丁醇/环己烷/H2PtCl6溶液的微乳体系,以N2H4.H2O为还原剂,Al2O3为载体制备Pt/Al2O3催化剂。以邻氯硝基苯(o-CNB)选择加氢反应为探针,考察微乳液组成对Pt/Al2O3催化剂选择加氢活性的影响。运用XRD、XPS、IR、TEM和EDS对载体和催化剂进行表征。结果表明,微乳体系中CTAB:正丁醇:环己烷质量比9:21:70,3.6%H2PtCl6溶液中制备的Pt/Al2O3催化剂的o-CNB选择加氢活性最高。Pt粒子粒径5 nm左右,与载体之间没有明显的电子效应。对于取代位置不同的间、对氯硝基苯(m-CNB、p-CNB)加氢,Pt/Al2O3催化剂也表现出较高的催化活性。Pt/Al2O3 catalyst was prepared from CTAB/butarol/cyclohexane/H2PtCl6 microemulsion,with hydrazine as reductant and Al2O3 as support.The effect of composition of microemulsion on the activity for selective hydrogenation over Pt/Al2O3 catalysts was studied by using o-chloronitrobenzene selective hydrogenation as a probe reaction.The support and catalyst were characterized by XRD,XPS,IR,TEM and EDS.The results showed that the Pt/Al2O3 catalyst made from the microemulsion with CTAB：butarol：cyclohexane mass ratio of 9：21：70 and H2PtCl6 concentration of 3.6% exhibited the highest activity in selective hydrogenation of o-CNB.Pt particle size was about 5 nm,and the electronic effect between Pt particle and carrier was not significant.It was also found that Pt/Al2O3 catalyst also exhibited higher activity for the hydrogenation of m-chloronitrobenzene and p-chloronitrobenzene with different substituted positions.

关 键 词：微乳液 铂/氧化铝 氯代硝基苯 选择加氢 

分 类 号：O643.38[理学—物理化学]