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对壳聚糖(CS)进行甲基丙烯酸缩水甘油酯(GMA)的接枝改性,并与Pt纳米簇进行杂化,制备出Pt/CS-g-GMA杂化膜。采用TEM、XRD、1HNMR和XPS等手段对杂化膜结构进行了表征,并研究了其对苯液相加氢反应的催化性能。结果显示:相对于壳聚糖负载铂纳米簇杂化膜催化剂(Pt/CS),使用Pt/CS-g-GMA杂化膜催化苯加氢反应,苯的转化率大幅度提高,从0.54%增加到了2.14%,环己烯的选择性一直保持在55%左右。而使用纯铂纳米簇催化剂时,产物中没有环己烯生成。因此,CS-g-GMA膜在控制苯选择性加氢反应中起到了重要作用。GMA基团的引入改变了壳聚糖的结晶度,增加了膜在苯中的溶胀度,详细讨论了杂化膜的结构、膜的溶胀度以及催化性能之间的关系。
The grafting modification of glycidyl methacrylate (GMA) on chitosan (CS) and the hybridization with Pt nanoclusters made Pt / CS-g-GMA hybrid membranes. The structure of the hybrid membrane was characterized by TEM, XRD, 1HNMR and XPS. The catalytic performance of the hybrid membrane for hydrogenation of benzene in liquid phase was also studied. The results showed that the conversion of benzene increased greatly from about 0.54% to about 1%, with the Pt / CS-g-GMA hybrid membrane catalyzed by hydrogenation of Pt / CS. Increased to 2.14%, cyclohexene selectivity has remained at about 55%. With pure platinum nanocluster catalysts, there is no cyclohexene formation in the product. Therefore, CS-g-GMA film plays an important role in the control of benzene selective hydrogenation. The introduction of GMA groups changed the crystallinity of chitosan, increased the swelling degree of the film in benzene, and discussed in detail the structure of the hybrid membrane, the swelling degree of the membrane and the relationship between the catalytic properties.