文献类型：期刊文献

中文题名：新型高效H_2-SCR尖晶石型NiFe_2O_4催化还原NO

英文题名：Novel high-efficienly H_2-SCR spinel-type NiFe_2O_4 for catalytic reduction of NO

作者：乔凯[1];罗雯军[2];王吉[2];曹礼梅[1];沈玉然[1];杨骥[1]

机构：[1]华东理工大学资源与环境工程学院,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;[2]中国舰船研究设计中心,上海201108

年份：2014

卷号：33

期号：8

起止页码：1385

中文期刊名：环境化学

外文期刊名：Environmental Chemistry

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：环保部公益性项目(2013467021);国家自然基金项目(21277045);上海"曙光计划"资助

语种：中文

中文关键词：烟气;脱硝;尖晶石;催化剂;H2-SCR

外文关键词：flue gas, denitration, spinel, catalyst,H2-SCR.

摘要：采用柠檬酸配位溶胶-凝胶法制备尖晶石型复合金属氧化物NiFe2O4,以H2为还原剂,在固定床反应器中考察了该催化剂催化还原NO的性能,并借助X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、比表面积测定(BET)、程序升温还原(TPR)和程序升温脱附(TPD)等方法对样品的晶体结构、形貌等特性进行了表征.结果表明.在空速4500 h-1,H2/NO浓度比为1,温度为400℃下,H2催化还原NO的效率可达97.8%,高H2/NO浓度比对NO转化率提升不大,高空速对其催化活性无明显影响.所制备的NiFe2O4催化剂具有典型的尖晶石结构,颗粒不规则,粒径大约为30—150 nm,并且具有良好的双官能团氧化还原性质.
Spinel-type complex oxide NiFe2 O4 was prepared by citric acid-ligand sol-gel method. The NO selective catalytic reduction （ SCR） activities by H2 were investigated in a fixed-bed reactor. The physical properties of the prepared samples were explored by means of X-ray diffraction （ XRD ） , scanning electron microscopy （ SEM ） , transmission electron microscopy （ TEM ） , surface area measurements （ BET ） , temperature-programmed reduction （ TPR ） and temperature-programmed desorption （TPD）. The results indicated that when the space velocity was 4500 h-1,the molar ratio of H2/NO was 1, and the temperature was 400 ℃,the SCR conversion of NO reached 97.8%. The NO conversion rate increased slightly with increasing H2/NO ratio and the effect of space velocity on catalytic activity of SCR process was ngelsible. It was also found that the prepared NiFe2 O4 catalyst was intact spinel-type crystal structures as irregular particle with particle size of about 30-150 nm, and the catalyst had good bifunctional oxygen reducibility.