堇青石蜂窝陶瓷载体酸处理对整体式La_(0.8)Sr_(0.2)MnO_3催化剂催化甲苯燃烧性能的影响  

Catalytic Performance Toward Toluene Combustion of La_(0.8)Sr_(0.2)MnO_3 Monolithic Catalyst with Acid-treated Honeycomb-shaped Cordierite Ceramic Support

作　　者：孙浩程 王永强[1] 赵朝成[1] 张利英[2] SUN Haocheng;WANG Yongqiang;ZHAO Chaocheng;ZHANG Liying(College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580;Shengli Oil Production Plant, Shengli Oilfield, Dongying 257051)

机构地区：[1]中国石油大学(华东)化学工程学院,青岛266580 [2]胜利油田胜利采油厂,东营257051

出　　处：《材料导报》2016年第24期32-36,共5页Materials Reports

基　　金：山东省自然科学基金(2014ZRE28006)

摘　　要：整体式催化剂是一种常用的催化剂,蜂窝陶瓷载体是其重要组成部分。酸处理可以改进其结构上的不足。使用不同质量分数、种类的酸溶液对堇青石蜂窝陶瓷载体进行了预处理,考察了酸处理对整体式催化剂的基本性质及甲苯催化活性的影响,并采用XRD、BET等表征手段进行分析。结果表明,蜂窝陶瓷载体经质量分数为30%硝酸溶液处理后可达最佳效果,负载率提高48%以上,比表面积扩大20倍以上,由其制得的催化剂催化甲苯燃烧的起燃温度为219℃,降低了19℃,完全转化温度为281℃。表征结果说明酸洗过程未改变载体组成,而是使载体比表面积增加20倍以上,从而提高了整体催化剂的催化活性。Monolithic catalyst is a kind of frequently used catalyst of which honeycomb shaped ceramic support is an important part and its structure can be improved by acid treatment.We studied in this paper the catalytic performances toward toluene combustion of a series of La0.8Sr0.2MnO3monolithic catalysts,in which the honeycomb shaped cordierite ceramic supports were pretreated by acid solutions differed in concentration and acid type,by mea surements of XRD,BET,etc..The different mass fraction and the kinds of acid are used to preprocess the cordierite honeycomb ceramics carrier.Results indicated that an optimized effect of the honeycomb shaped ceramic support could be achieved while pretreated by30wt%nitric acid solution,as the load rate increased by more than48%and specific surface area was expanded by more than20times.The monolithic catalyst with that optimized pretreated support had a light off temperature of219℃(declined by19℃)and a complete conversion temperature of281℃.The characte rizations suggested an unchanged composition but a more than20times larger specific surface area,for the acid treated support compared to untreated one,thus leading to promoted catalytic activity of the monolithic catalyst.

关 键 词：酸处理 堇青石 蜂窝陶瓷载体 整体式催化剂 挥发性有机物 甲苯 催化燃烧 

分 类 号：TB34[一般工业技术—材料科学与工程]