文献类型：期刊文献

中文题名：高效钙钛矿型H2-SCR催化剂的制备与研究

英文题名：Prepartion and study of efficient pervoskite catalyst of H_2-SCR

作者：沈玉然[1];乔凯[1];曹礼梅[1];杨骥[1]

机构：[1]华东理工大学环境工程学院国家环境保护化工过程环境风险评价与控制重点实验室,上海200237

年份：2015

卷号：9

期号：1

起止页码：295

中文期刊名：环境工程学报

外文期刊名：Chinese Journal of Environmental Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：环境保护部公益性行业科研专项(2013467021);国家自然科学基金资助项目(21277045);上海“曙光计划”资助项目

语种：中文

中文关键词：H2-SCR;钙钛矿;催化剂;烟气

外文关键词：H2-SCR;;flue gas;;catalyst;;perovskite

摘要：用溶胶凝胶法合成了3种不同B位的钙钛矿催化剂,同时用X射线衍射(XRD)、比表面积分析(BET)、扫描电镜(SEM)、程序升温化学吸附(TPR)4种手段对催化剂进行了物理化学表征。从经济性和实际性考虑,本研究使用了清洁无二次污染的H2作为SCR的还原剂,同时控制了H2的加入比例,在小NO/H2比(1∶1、1∶5、1∶10)情况下,考察了3种催化剂的催化效率。由于实际燃煤烟气中含有大量的O2,因此,同时考察了高O2(O2/NO=100∶1)的加入对氧化还原反应的影响。从考察结果我们得知,在NO/H2为1∶1时,La Co O3和La Ni O3的催化活性优于La Mn O3,达到80%。而在高H2/NO比时,则是La Mn O3的催化活性最高,达95%以上。O2的加入对氧化还原反应影响较大,温度高于250℃时,O2出现竞争性反应,消耗了大部分的还原剂,使得NO脱除率降低,而在250℃以下,O2的影响较小。
In this work,three different B-site doped perovskite catalysts were prepared via sol-gel method.Thereafter,the catalysts were characterized by X-ray diffraction( XRD),specific surface area analysis( BET),scanning electron microscopy( SEM) and temperature programmed adsorption( TPR). The clean and environmental friendly hydrogen was employed as the reducing agent for both the economic and practical considerations.By controlling the flowrate of H2,the catalytic performance of the three catalysts were examined with small NO/H2ratios( 1 ∶ 1,1 ∶ 5,1 ∶ 10). Due to the fact that the actual flue gas contains a large number of O2,the effect of O2 on the redox reaction with high oxygen content( O2/ NO = 100 ∶ 1) was studied at the same time. The results show that when the ratio of NO / H2 is 1 ∶ 1,the catalytic activity of La Co O3 and La Ni O3 is better than that of La Mn O3,with the NO conversion as high as 80%. While at the high H2/ NO ratio,the La Mn O3 presents the highest catalytic activity,with the NO conversion up to 95%. It was shown that the addition of O2 greatly affects the redox reaction,when temperature is above 250 ℃,O2 competes with NO consuming most of the reducing agent,and greatly reduces the NO conversion. However when temperature is below 250 ℃,the addition of O2 has less influence.