CoB催化剂在硼氢化钠-乙醇体系中制氢的应用  

The application of CoB catalysts in NaBH_4-ethanol system for hydrogen production

作　　者：梁志花 李其明[1] 李芳[1] 徐国菲 夏鑫 赵士夺 任书成 

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

出　　处：《应用化工》2017年第11期2119-2122,共4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

摘　　要：采用化学还原法制备了非晶态合金CoB催化剂,研究其在NaBH_4-乙醇复合体系中的催化活性。考察了基于乙醇量(硼氢化钠浓度)、NaOH质量浓度、反应体系温度、醇水体系对CoB催化NaBH_4制氢的影响。结果表明,硼氢化钠产氢速率随着乙醇量(硼氢化钠浓度)的增加呈现出先加快后减缓的变化;NaBH_4产氢速率随碱质量浓度的增加呈现出先增加后减小的变化,且最优碱浓度大约为5%;NaBH_4制氢速率随反应温度增加而快速增加,反应动力学计算显示该体系的表观反应活化能Ea为56.45 kJ/mol;在相同条件下,CoB催化硼氢化钠醇解制氢的产氢速率快于催化硼氢化钠水解制氢的产氢速率。Amorphous alloy CoB catalysts were prepared by chemical reduction method,and their catalytic activity was investigated in the alcohol solution of NaBH_4. The influence of NaBH_4 concentration,NaOH concentration,reaction system temperature and alcohol-water system on CoB catalyzes NaBH_4 hydrogen production was investigated. The result indicated that the hydrogen production rate accelerates firstly and then retardes when the amount of ethanol increases. At the same time,the hydrogen production rate increases firstly and then decreases when the NaOH concentration increases,where 5% NaOH was the optimal alkali concentration. In addition,the hydrogen production rate increases continuously along with the increase of temperature. The kinetic calculation showed that the activation energy of NaBH_4-alcohol system for hydrogen generation based on CoB catalyst is about 56. 45 kJ/mol. The hydrogen production rate of CoB catalyzed NaBH_4-alcohol system was faster than the catalytic hydrolysis of NaBH_4.

关 键 词：CoB催化剂 硼氢化钠 制氢 醇解制氢 催化活性 

分 类 号：TQ426.94[化学工程] TQ138.12