棉杆活性炭负载Co-B催化剂催化硼氢化钠水解制氢的性能  

Hydrogen generation by sodium borohydride hydrolysis on Co-B catalysts supported on cotton stalk-based activated carbon

作　　者：曲健林 韩敏[1] 张秀丽[1] 徐秀峰[2] 郭庆杰[1] 

机构地区：[1]青岛科技大学化工学院,清洁化工过程山东省高校重点实验室,山东青岛266042 [2]烟台大学应用催化研究所,山东烟台264005

出　　处：《化工学报》2015年第1期105-113,共9页CIESC Journal

基　　金：国家自然科学基金项目(21276129);青岛市应用基础研究计划项目(14-2-4-5-jch)~~

摘　　要：采用棉杆生物质废弃物为原料、H3PO4为活化剂,在流化床中化学活化制备棉杆活性炭,并将其作为载体负载Co-B组分,制备了棉杆活性炭基Co-B催化剂(Co-B/C)。以该催化剂应用于硼氢化钠水解制氢,系统考察了活性炭活化条件(活化温度、活化时间、活化剂用量3 4H PO CSm/m)、水解反应温度及催化剂循环使用次数对催化产氢性能的影响。同时,使用N2物理吸附、FTIR、XRD和SEM等技术对活性炭载体及催化剂进行了表征。结果表明:在活化温度500℃、活化时间1 h、3 4H PO CSm/m为0.75条件下制得的活性炭载体,负载14.5%Co的催化剂表现出最佳催化性能:反应温度为25℃时,平均产氢速率可以达到12.06 L·min-1·(g Co)-1,催化剂表现了较高活性。催化产氢反应的活化能为44.61 k J·mol-1。循环使用5次后,催化剂仍保持初次活性的54%。Cotton stalk-based activated carbons were prepared by phosphoric acid activation of cotton stalks （CS） in a fluidized bed. The Co-B catalysts supported on cotton stalk-based activated carbon were generated by the impregnation-chemical reduction method. Meanwhile, the prepared activated carbons and catalysts were characterized by nitrogen physisorption, FTIR, XRD and SEM. The effects of activation reaction parameters, reaction temperature and recycle times on hydrogen generating performance of the activated carbons supported Co-B catalysts were investigated. The optimal activation temperature, activation time and amount of activator （ H3PO4 CSm /m ） for activation of cotton stalk were 500℃, 1 h and 0.75, respectively. Under these conditions, the as-prepared Co-B/C catalyst with 14.5%（mass） Co exhibited the best hydrogen generating performance with an average rate of hydrogen generation up to 12.06 L·min-1·（g Co）-1 at 25℃. Activation energy of hydrogen generation reaction on such catalyst was estimated to be 44.61 kJ·moL^-1. After five cycles, the catalyst retained＆amp;nbsp;54%initial activity, exhibiting high activity and stability.

关 键 词：活性炭 催化剂载体 活化条件 Co-B/C催化剂 硼氢化钠 制氢 

分 类 号：TK91[动力工程及工程热物理] X712[环境科学与工程—环境工程]