不同方法制备LaCu_(0.8)Zn_(0.2)Al_(11)O_(19-δ)催化剂及其催化分解N_2O活性研究  

Preparation of N_2O decomposition catalyst LaCu_(0.8)Zn_(0.2)Al_(11)O_(19-δ)

作　　者：宋永吉[1] 董留涛[1] 李翠清[1] 王虹[1] 任晓光[1] 

机构地区：[1]北京石油化工学院化学工程学院,北京102617

出　　处：《环境污染与防治》2009年第9期19-22,共4页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.20476012、No.20676017);北京市属、市管高校人才强教计划资助项目“清洁燃料技术开发”(No.BJJWR20051102、No.PHR200907129)

摘　　要：采用共沉淀法、溶胶-凝胶法和反相微乳液法制备了六铝酸盐催化剂LaCu0.8Zn0.2Al11O19-δ,进行了X射线衍射(XRD)和BET表征,并考察了它们对N2O催化分解反应的活性,研究了制备方法对催化剂LaCu0.8Zn0.2Al11O19-δ的结构、粒径、比表面积和催化分解N2O活性的影响。结果表明,3种方法制备的催化剂经1200℃焙烧4h后,都能形成六铝酸盐晶相,其中反相微乳液法制备的催化剂具有较小的粒径和较大的比表面积,其催化分解N2O的活性表现最佳,起始反应温度(T10%)为494℃,完全反应温度(T99%)为678℃。Series of hexaaluminate catalysts LaCu0.8Zn0.2Al11019-δ（x=0, 0.2,0.4,0.6,0.8,1.0） were prepared by reverse microemulsion method, and the LaCu0.8Zn0.2Al11019-δ among the six catalysts presented the best performance for N2 O decomposition. Three LaCu0.8Zn0.2Al11019-δ prepared by co-precipitation method, sol-gel method and inverse microemulsion method were characterized by means of XRD and BET technique. The effect of preparing methods on catalyst structure, particle size, specific surface area and capability of N2O decomposition was investigated. The results showed that catalysts that roasting at 1 200 ℃ for 4 h could obtain good hexaaluminate phase. The catalysts prepared with inverse microemulsion method exhibited smaller particle size and bigger specific surface area and better capability for N20 decomposition, the light-off temperature（T10% ） and total conversion temperature （T99%） were 494 ℃ and 678 ℃ respectively.

关 键 词：N2O分解 六铝酸盐 共沉淀法 溶胶-凝胶法 反相微乳液法 

分 类 号：O643.36[理学—物理化学] X831[理学—化学]