摘要
采用浸渍法与化学还原法相结合制备了一系列USY型分子筛负载非晶态合金硼化钴(Co B/USY)催化剂,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。XRD表征表明,USY分子筛载体上负载的活性组分Co B属于非晶态结构。通过扫描电子显微镜,对比了负载型Co B/USY催化剂和粉末状Co B催化剂的微观形貌,发现非晶态合金活性组分Co B能够很好的分布在USY分子筛载体表面,较粉末状Co B有更高的分散度。催化硼氢化钠水解制氢实验结果表明,相对于粉末状Co B催化剂,负载型Co B/USY催化剂在硼氢化钠水解制氢中具有更高的催化活性,30℃时Na BH4水解产氢速率约为1.5 L/(min·g)。反应动力学的计算结果显示,负载型Co B/USY催化剂在催化Na BH4水解制氢反应中表观活化能约为65.9 k J/mol,大大低于粉末状Co B催化剂的活化能(72.1 k J/mol)。
USY zeolite supported cobalt boride amorphous alloy catalysts（ Co B / USY） were prepared via a combined impregnation and chemical reduction method. Their catalytic activities were investigated in hydrogen production from the hydrolysis of Na BH4. XRD characterization indicates that Co B active components supported by USY zeolite have excellent amorphous structure. Micro-morphology of Co B / USY supported catalysts and powdered Co B were checked using SEM. SEM images show that the amorphous Co B are well dispersed onto USY surface which brings relatively high dispersions of Co B species. In the hydrogen generation from Na BH4 hydrolysis,Co B / USY supported catalyst exhibits much higher catalytic activity compared with powdered Co B catalyst. The hydrogen generation rate of Co B / USY supported catalysts reaches about 1. 5 L /（ min·g）,when the temperature is 30 ℃. The calculated apparent activation energy for Na BH4 hydrolysis is 65. 9 k J / mol based on Co B / USY supported catalysts which is obviously lower than that of powdered Co B catalyst（ 72. 1 k J / mol）.
出处
《应用化学》
CAS
CSCD
北大核心
2016年第6期655-660,共6页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金项目(21201096)
辽宁省教育厅资助项目(L2010242)
辽宁省教育厅辽宁石油化工大学石油化工重点实验室项目(LZ2015050)
中国科学院煤制乙二醇及相关技术重点实验室资助项目~~
关键词
硼化钴催化剂
分子筛
硼氢化钠
制氢
cobalt boride catalyst
molecular sieves
sodium borohydride
hydrogen generation
