超支化聚酰胺负载铂纳米簇杂化膜催化苯加氢反应

摘要

Catalytic behaviors of platinum nanoclusters supported on hyperbranched polyamide for the hydrogenation of benzene were studied.A series of hyperbranched polyamides with different structures were synthesized by direct condensation polymerization,and the corresponding Pt nano-cluster/hyperbranched polyamide（Pt-HBPA） catalysts were prepared.The structures of catalysts were characterized by TEM,FT-IR,XRD and XPS.Results showed that the average diameter of the Pt particles was about 3—5 nm.These Pt particles may coordinate with N and O in hyperbranched polyamide.Compared with the pure Pt nano-clusters,Pt-HBPA catalyst greatly improved the conversion of benzene by about 13 times.Meanwhile,cyclohexene was found to be one of the products.These catalytic systems exhibit high cataly-tic activity and moderate selectivity for cyclohexene.%制备了一系列不同结构的超支化聚酰胺及其负载铂纳米簇杂化膜催化剂,研究了该催化剂对苯液相加氢反应的催化性能。利用透射电子显微镜、傅里叶变换红外光谱仪、X-射线衍射和X-射线光电子能谱等对铂纳米簇以及负载催化剂的结构进行了表征。结果表明：铂纳米颗粒分散均匀,粒径为3～5 nm;催化剂中的Pt与超支化聚酰胺上的N和O之间存在一定程度的配位。对比没有负载的纯铂催化剂,用超支化聚酰胺负载铂纳米簇杂化膜催化剂催化苯液相加氢反应,苯的转化率提高了约13倍,且产物中出现了部分加氢产物环己烯,表现出良好的催化活性和一定的环己烯选择性。