Ce-La/Al_2O_3催化CO还原NO性能的研究  

Study on performance of Ce-La/Al_2O_3 catalytic reduction of NO by CO

作　　者：郭丽丽[1] 张强[1] 刘璐[1] 李春义[1] 

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,山东青岛266580

出　　处：《石化技术与应用》2016年第6期445-451,共7页Petrochemical Technology & Application

基　　金：青岛市民生计划项目(项目编号:13-1-3-126-nsh)

摘　　要：以γ-Al_2O_3为载体,采用浸渍法制备出一系列Ce/Al_2O_3,La/Al_2O_3,Ce-La/Al_2O_3催化剂,利用X射线衍射(XRD),N2吸附-脱附,氢气程序升温还原(H2-TPR)等分析手段对催化剂进行了表征,并在O2存在的条件下,考察了金属Ce,La负载量、焙烧条件、水蒸气以及SO2对催化剂催化CO还原NO性能的影响。结果表明:与Ce10Al催化剂相比,负载3%(质量分数)的La后,在反应温度为500℃的条件下,Ce10La3Al催化剂可使NO转化率提高22个百分点;La能够提高Al_2O_3的热稳定性,使Ce10La3Al催化剂具有优异的抗烧结能力和水热稳定性,但SO2可致使其中毒失活。With γ-Al_2O_3 as carrier,a series of Ce / Al_2O_3,La /Al_2O_3,Ce-La /Al_2O_3 catalysts were prepared by the impregnation method. The catalysts were characterized by analysis means such as X-ray diffraction（ XRD）,N2adsorption-desorption and H2 temperature programmed reduction（ H2-TPR） etc,and in the presence of O2,the influences of loading capacity of Ce or La,calcination conditions,H2 O or SO2 on the performance of the catalysts catalytic reduction of NO by CO were investigated.The results showed that compared with catalyst Ce10 Al,after loading 3%（ mass fraction） La,the NO conversion could increase by 22 percent points with catalyst Ce10La3 Al at the condition of reaction temperature 500 ℃. The thermal stability of Al_2O_3 could be enhanced by La,and catalyst Ce10La3 Al had excellent anti-sintering ability and hydrothermal stability,however,SO2 could cause it poisoning deactivation.

关 键 词：催化裂化 氮氧化物 烟气脱硝 Ce/Al2O3催化剂 Ce-La/Al2O3催化剂 焙烧 水热稳定性 催化剂中毒 

分 类 号：TE624.431[石油与天然气工程—油气加工工程]