负载型氧化铁对高毒气体PH_3的催化分解  

Catalytic decomposition of highly toxic PH_3 gas over supported Fe_2O_3

作　　者：李俐俐[1,2,3] 胡春红[1] 朱自学[1] 古红梅[1] 张宝贵[2] 

机构地区：[1]周口师范学院生命科学系,周口466001 [2]南开大学环境科学与工程学院,天津300071 [3]周口师范学院稀土功能材料及应用重点实验室,周口466001

出　　处：《环境工程学报》2013年第8期3111-3116,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21171179);河南省科技攻关项目(122102310368);河南省高等学校青年骨干教师资助计划项目(2012GGJS-182)

摘　　要：采用沉积-沉淀法制备了碳纳米管(CNTs)和二氧化硅(SiO2)负载的纳米Fe2O3催化剂,将其应用于高毒气体PH3分解反应。通过XRD,TEM,XPS,BET等一系列检测手段,对制备样品的相结构、形貌、组分和比表面积进行了表征。研究结果表明,在PH3催化分解反应过程,极少量的产物P迁移至Fe2O3中,形成金属磷化物FeP作为反应的活性相。与Fe2O3/SiO2相比,Fe2O3/CNTs显示了较高的催化性能。在440℃反应温度下,Fe2O3/CNTs对PH3分解率达到99.8%。CNTs作为催化剂载体的优秀性能可归因于CNTs良好的导电性能和活性组分在其上的高度分散。Fe2O3 supported on carbon nanotubes（CNTs） and SiO2（Fe2O3/CNTs,Fe2O3/SiO2） catalysts was synthesized through deposition-precipitation method,and the catalytic activity of the obtained catalysts was evaluated using the decomposition of highly toxic PH3 gas.The phase structure,morphology,composition,and specific surface area of the catalysts were characterized using a number of analytical instrumentations including XRD,TEM,XPS,BET,etc.The results indicate that during PH3 catalytic decomposition reaction,a very small amount of product P migrates into the Fe2O3 particles to form metal phosphide FeP which acts as dominant active phase in the reaction.Compared with Fe2O3/SiO2,Fe2O3/CNTs perform higher catalytic activity.At 440℃,single-pass phosphine conversion of about 99.8% can be achieved on Fe2O3/CNTs.The superior performance of CNTs support can be attributed to the good electronic conductivity of CNTs and high dispersion of active composition on CNTs.

关 键 词：氧化铁 碳纳米管 磷化物 磷化氢催化分解 

分 类 号：X511[环境科学与工程—环境工程]