Ce(SO_(4))_(2)改性对V-W/Ti催化剂抗碱土中毒性能提升的影响  

Ce(SO_(4))_(2)modification of V-W/Ti catalyst for improving its resistance to alkaline-earth metals poisoning

作　　者：费亦凡 仲兆平 周峻伍 陈宏 FEI Yi-fan;ZHONG Zhao-ping;ZHOU Jun-wu;CHEN Hong(School of Energy&Environment,Southeast University,Key Laboratoryof Energy Thermal Conversion and Control of Ministry of Education,Nanjing 211189,China)

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,江苏南京211189

出　　处：《现代化工》2025年第4期153-159,共7页Modern Chemical Industry

基　　金：江苏省科技成果转化专项资金项目(BA2022073);清洁高效燃煤发电与污染控制国家重点实验室开放课题(D2022FK076)。

摘　　要：为提升钒钨钛(V_(2)O_(5)-WO_(3)-TiO_(2))催化剂抵御碱土金属中毒耐受性、拓宽反应温度窗口,采用等体积浸渍法制备了一系列Ce(SO_(4))_(2)-V_(2)O_(5)-WO_(3)-TiO_(2)(简称Ce-V-W-Ti)催化剂,考察了Ce(SO_(4))_(2)添加量对催化剂脱硝性能的影响,并通过N_(2)(吸附-脱附、XRD、XPS、NH_(3)-TPD对催化剂进行表征分析,使用密度泛函理论计算进一步探究了催化剂抵御碱土金属中毒机理。结果表明,Ce(SO_(4))_(2)的掺杂提高了表面化学吸附氧的比例,促进了V^(4+)/V^(5+)、Ce^(3+)/Ce^(4+)间的氧化还原过程,增加了催化剂表面的弱酸位点和强酸位点。Ce_(1)V_(1)W_(8)/90Ti改性效果最佳,在200^400℃的脱硝性能均明显优于V_(1)W_(8)/91Ti,在300℃、n(CaO)/n(V_(2)O_(5))=3的反应条件下,NO_(x)脱除率由46.07%增至63.71%,在350℃、含有SO_(2)的气氛中,NO_(x)脱除率始终保持97%以上。To enhance the resistance of vanadium tungsten titanium(V_(2)O_(5)-WO_(3)-TiO_(2))catalysts to alkaline earth metal poisoning and broaden the reaction temperature window,a series of Ce(SO_(4))_(2)-V_(2)O_(5)-WO_(3)-TiO_(2)(referred to as Ce-V-W-Ti)catalysts are prepared via an equal volume impregnation method.The influence of Ce(SO_(4))_(2)addition amount on the denitrification performance of the catalysts is studied,and the catalysts are characterized by means of N_(2)adsorption-desorption,XRD,XPS,and NH3-TPD.Density functional theory calculation is used to explore further the mechanism of the catalysts.resistance to alkaline earth metal poisoning.Results show that the doping of Ce(SO_(4))_(2)increases the proportion of chemically adsorbed oxygen on the surface,promotes the redox process between V^(4+)/V^(5+)and Ce^(3+)/Ce^(4+),and increases weak acid and strong acid sites on the surface of catalysts.Ce1V1W8/90Ti has the best modification effect,and its denitrification performance at 200-400℃is significantly better than that of V1W8/91Ti.Under the reaction conditions of 300℃and n(CaO)/n(V_(2)O_(5))=3,NO_(x)removal rate increases from 46.07%to 63.71%.In the atmosphere containing SO2 at 350℃,NO_(x)removal rate always remains above 97%.

关 键 词：选择催化还原 Ce(SO_(4))_(2)改性 活性 耐碱性 量子化学计算 

分 类 号：X511[环境科学与工程—环境工程]