制备方法对BaAl_(12)O_(19-α)催化剂结构和甲烷催化燃烧活性的影响  

Effect of Preparation and Mn^(2+) Substituted on the Crystal Structure and Catalytic Activity of BaAl_(12)O_(19-α)for Catalytic Combustion of Methane

作　　者：朱安民[1] 宋永吉[2] 任晓光[2] 陈霭璠[1] 罗瑞贤[1] 

机构地区：[1]北京化工大学,北京100029 [2]北京石油化工学院,北京102617

出　　处：《天然气化工—C1化学与化工》2006年第5期36-40,共5页Natural Gas Chemical Industry

基　　金：国家自然科学金资助项目(20476012);北京市自然科学基金资助项目(8032007);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(BJJ WR20051102)

摘　　要：采用反相微乳液法、普通氨水共沉淀法制备BaAl12O19-α六铝酸盐催化剂及其中的Al3+部分被Mn2+取代的BaMnAl11O19-α催化剂,研究了合成方法、Mn2+取代部分Al3+对催化剂晶相结构、比表面积、粒径以及甲烷催化活性的影响。结果表明,反相微乳液法制备的催化剂经1200℃焙烧后更有利于形成六铝酸盐晶相,且具有粒径小、比表面积大、甲烷催化活性高的特点。与BaAl12O19-α相比,BaMnAl11O19-α催化剂具有更高的比表面积(42.87m2/g)和更优异的催化活性,起燃温度T10%为473℃,T90%为668℃。The catalysts for catalytic combustion of methane, hexa-aluminate BaAl12O19-α and its derivtive, BaMnAl11O19-α, in which Mn^2 ＋ partially substituted for Al^3 ＋ , were prepared by reverse microemulsion mediated NH4OH coprecipitation and conventional NH4OH coprecipitation methods. Effects of preparation methods and Mn^2 ＋ substitution on the phase structure, surface area, diameters of catalysts and catalytic combustion of methane were investigated. The results show that the catalysts prepared by reverse microemulsion mediated NH4OH coprecipitation forms hexa-aluminate crystal phase more easily when calcined at 1200℃, and has smaller particle size,larger specific surface area and higher catalytic activity than the catalyst prepared by conventional NH4OH coprecipitation method. Compared to unsubstituted catalyst, Mn^2 ＋ substituted catalyst had higher specific surface area（42.87m^2/g） and more excellent catalytic activity for methane combustion, and the temperatures at which 10% and 90% methane were converted were 473℃and 668℃,respectively.

关 键 词：反相微乳液 催化燃烧 六铝酸盐 甲烷 催化剂 BaMnAl11O19-α 

分 类 号：O643[理学—物理化学]