ZIF-7负载CoB催化剂的制备及其在制氢中的应用  

The preparation of ZIF-7 supported CoB catalyst and its application in hydrogen generation

作　　者：梁志花 李其明[1,2] 李芳[1] 赵士夺 

机构地区：[1]辽宁石油化工大学化学化工与环境学部石油化工重点实验室,辽宁抚顺113001 [2]中国科学院煤制乙二醇及相关技术重点实验室,福建福州350002

出　　处：《应用化工》2016年第10期1832-1835,1840,共5页Applied Chemical Industry

基　　金：国家自然科学基金项目(21201096);辽宁省教育厅资助项目(L2010242);辽宁省教育厅石油化工重点实验室资助项目;中国科学院煤制乙二醇及相关技术重点实验室资助项目

摘　　要：先后采用化学浸渍和还原的方法制备了不同比例的沸石咪唑酯骨架材料ZIF-7负载CoB的催化剂,对其结构进行了表征,并系统探究了该催化剂在催化硼氢化钠水解制氢中的催化活性。结果表明,相比于纳米CoB粉末催化剂,负载型CoB/ZIF-7催化剂在硼氢化钠水解制氢中具有更高的催化活性,25℃时NaBH_4水解产氢速率大约为252.19 m L/(min·g)。化学反应动力学表明:负载型CoB/ZIF-7催化剂催化NaBH_4水解制氢反应属于一级反应,其表观活化能约为51.48 k J/mol,远远低于纳米CoB粉末催化剂的活化能72.01 k J/mol。Zeolitic imidazolate framework ZIF-7 supported CoB catalysts were prepared via a combined impregnation and chemical reduction method. The structure were characterized,and the catalytic activities were investigated in hydrogen production from the hydrolysis of NaBH_4. In the hydrogen generation from NaBH_4 hydrolysis,CoB / ZIF supported catalyst exhibits much higher catalytic activity compared with powdered CoB catalyst. The hydrogen generation rate of CoB / ZIF supported catalysts reach about252. 19 m L /（ min·g） when the temperature is 25 ℃. It was found that the hydrogen generation from the hydrolysis of sodium borohydride using CoB / ZIF-7 catalysts can be ascribed into one-order reaction. The kinetic experimental result shows that the activation energy for NaBH_4 hydrolysis is calculated to be51. 48 k J / mol based on CoB / ZIF supported catalysts which is obviously lower than powdered CoB catalyst72. 01 k J / mol.

关 键 词：催化剂 ZIF-7 NABH4 制氢 CoB催化剂 

分 类 号：TQ426.64[化学工程] TQ116.2