摘要
以城市污水处理厂剩余污泥为原料,采用氧化锌和硝酸铁化学浸渍、高温热解制备脱除 NO_x 的催化剂。用微型气固相催化反应装置考察了该催化剂在 NH_3选择性催化还原 NO 中的应用效果及寿命。实验结果表明:在350～450℃时的催化活性较高,在400℃时 NO 的最大转化率可达98.3%;催化剂的活性良好,经660 min 的活性测试,催化剂的活性只降低了约3%。对该催化剂进行了 X 射线衍射、热重和扫描电镜分析,分析结果表明,该催化剂含有丰富的金属元素及碳元素,具有丰富的孔结构和晶体结构,而且表面及孔隙间负载的活性粒子较多,这些特征也表明该催化剂具有良好的催化性能。
A kind of catalyst for NOX removal was prepared using surplus sludge from a municipal sewage treatment plant as raw material, with the method of impregnating surplus sludge in ZnCl2 and Fe （NO3 ）3 solution and then pyrolyzing it at high temperature. The effects and lifetime of the catalyst on the selective catalytic reduction of NO with NH3 were evaluated in a gas-solid catalytic microreactor. The experimental results indicate that the catalyst has a better catalytic activity at 300 - 450 ℃, and the maximum conversion of NO can reach 98.3% at 400 ℃. After tested for 660 min, its catalytic activity only decreased about 3%. The analysis results by XRD, TG and SEM show that the catalyst contains abundant metal elements and carbon, and it is plenty of porous and crystal structures with active particles on its surface and in its holes. All of these characters indicate that this catalyst has a good catalytic activity.
出处
《化工环保》
CAS
CSCD
北大核心
2007年第1期84-88,共5页
Environmental Protection of Chemical Industry
基金
2004年新世纪人才支持计划(NCET-04-0768)
2005年度教育部科学研究重点项目(105126)
湖南省自然科学基金项目(06JJ4118)
湖南大学基金项目(521101850)
关键词
剩余污泥
热解
催化刑
氮氧化物
surplus sludge
pyrolysis
catalyst
nitrogen oxide
