文献类型：期刊文章

作　　者：张亚平[1] 王龙飞[1] 李娟[1] 张会岩[1] 徐海涛[1,2] 肖睿[1] 杨林军[1]

机构地区：[1]东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室,江苏南京210096 [2]南京宇行环保科技有限公司,江苏南京211102

出　　处：《Chinese Journal of Catalysis》

基　　金：supported by the National Natural Science Foundation of China(51306034);Key Research&Development Projects of Jiangsu Province(BE2015677);the National Basic Research Program of China(2013CB228505)~~

年　　份：2016

卷　　号：37

期　　号：11

起止页码：1918-1930

语　　种：中文

收录情况：AJ、BDHX、BDHX2014、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2015_2016、EI(收录号：20164903098578)、JST、RSC、SCI-EXPANDED(收录号：WOS:000391081000013)、SCIE、SCOPUS、WOS、ZGKJHX、核心刊

摘　　要：V2O5/TiO2-ZrO2 catalysts containing various amounts of WO3 were synthesized.The catalyst morphologies,catalytic performances,and reaction mechanisms in the selective catalytic reduction of NOx by NH3 were investigated using in situ diffuse-reflectance infrared Fourier-transform spectroscopy,temperature-programmed reduction（TPR）,X-ray diffraction,and the Brunauer-Emmett-Teller（BET） method.The BET surface area of the triple oxides increased with increasing ZrO2 doping but gradually decreased with increasing WO3 loading.Addition of sufficient WO3 helped to stabilize the pore structure and the combination of WO3 and ZrO2 improved dispersion of all the metal oxides.The mechanisms of reactions using V2O5-9%WO3/TiO2-ZrO2 and V2O5-9%WO3/TiO2were compared by using either a single or mixed gas feed and various pretreatments.The results suggest that both reactions followed the Eley-Ridel mechanism;however,the dominant acid sites,which depended on the addition of WO3 or ZrO2,determined the pathways for NOx reduction,and involved[NH4^＋-NO-Bronsted acid site]^＊ and[NH2-NO-Lewis acid site]^＊ intermediates,respectively.NH3-TPR and H2-TPR showed that the metal oxides in the catalysts were not reduced by NH3 and O2did not reoxidize the catalyst surfaces but participated in the formation of H2O and NO2.

关 键 词：ZIRCONIA Tungsten oxide  Selective catalytic reduction by ammonia  In situ infrared diffuse-reflectance  Fourier-transform spectroscopy  Reaction mechanism  

分 类 号：O643.36]