摘要
制备了Ce-Cr-Ni/TiO_2蜂窝状脱硝催化剂,并用于选择性催化还原NOx,以CO为还原剂,考察了其催化活性以及稀土元素Ce的掺加对催化活性的影响。经过脱硝效率检测发现,催化剂具有较好的催化活性,掺加稀土元素Ce后催化剂的催化活性得到进一步提高,其中1. 1Ce-Cr-Ni/TiO_2脱硝效率最高,在550℃时NOx转化率达到97. 8%。通过比表面积测定(BET)、X射线衍射(XRD)、能谱仪(EDS)、X射线光电子能谱分析(XPS)以及H2-程序升温还原(H2-TPR)等方法对催化剂进行了表征,结果表明,稀土元素Ce的掺加在一定程度上提高了催化剂的BET比表面积;与2. 3Cr-Ni/TiO_2相比,催化剂1. 1Ce-2. 3CrNi/TiO_2中的活性组分分布均匀,且具有较高的Ni3+/Ni2+比值和表面吸附氧(Oα)含量以及较强的氧化还原能力,这为催化剂脱硝性能的提高提供了有利条件。
Honeycomb denitration catalyst Ce-Cr-Ni/TiO2 is prepared and used in the selective catalytic reduction of NOxwith CO as reducing agent.The catalytic activity of Ce-Cr-Ni/TiO2 is evaluated and the effect of Ce doping on the catalytic activity is investigated.It is found through denitrification efficiency testing that the catalyst has better catalytic activity,which can be further improved after addition of Ce.The 1.1 Ce-Cr-Ni/TiO2 catalyst exhibits the highest denitration efficiency,with the conversion of NOxreaching 97.3%at 550℃.This catalyst is characterized by specific surface area detection(BET),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS),and H2 temperature-programmed reduction(H2-TPR).The characterization results show that the addition of Ce can increase the BET specific surface area of the catalyst to a certain extent.The 1.1 Ce-2.3 Cr-Ni/TiO2 catalyst has higher dispersion of the active components,higher Ni3+/Ni2+ratio,more surface adsorption oxygen(Oβ)and stronger redox capacity that 2.3 Cr-Ni/TiO2 catalyst,which is beneficial to improve its catalytic activity in removing NOx.
作者
姚佳
刘少光
林文松
汪楷迪
YAO Jia;LIU Shao-guang;LIN Wen-song;WANG Kai-di(School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Hiyou Environmental Protection Material Co.,Ltd.,Shanghai 201611,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310058,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)
出处
《现代化工》
CAS
CSCD
北大核心
2019年第5期123-127,共5页
Modern Chemical Industry
基金
上海张江国家自主创新示范区专项发展资金重点项目(201609-SJ-C1085-007)
上海工程技术大学研究生科研创新资助项目(E3-0903-17-01078)
关键词
一氧化碳
选择性催化还原
催化剂
催化剂活性
Ce
carbon monoxide
selective catalytic reduction
catalyst
activity of catalyst
Ce
