涂覆式蜂窝状钒钨钛催化剂的SCR及抗中毒性能  

SCR and anti-poisoning properties of coated honeycomb vanadium-tungsten-titanium oxides catalyst

作　　者：黄一丹 郭铭玉 刘宪斌 刘博群 崔少平 刘皓 赵英杰[2] 卫金秋 陈思奇 刘斌 HUANG Yidan;GUO Mingyu;LIU Xianbin;LIU Boqun;CUI Shaoping;LIU Hao;ZHAO Yingjie;WEI Jinqiu;CHEN Siqi;LIU Bin(College of Marine and Environmental Sciences,Tianjin University of Science and Technology,Tianjin,300457,China;Laboratory of Environmental Protection in Water Transport Engineering,Tianjin Research Institute of Water Transport Engineering,Tanggu,Tianjin,300456,China;School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457 [2]交通运输部天津水运工程科学研究院,天津300456 [3]天津大学环境科学与工程学院,天津300350

出　　处：《环境工程学报》2023年第8期2624-2634,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(52200128);交通运输部天津水运工程科学研究院科技创新基金项目(TKS20210203)。

摘　　要：为制备性能优异的涂覆式蜂窝状SCR催化剂用于高效去除NO_(x),采用正交实验探究添加剂对催化剂的涂覆效果及SCR性能影响。结果表明,当PVA和吐温-20含量分别为0.2%和0.1%,pH为1.5时制备的浆料有较好的负载率、附着率和NO转化率。而后对整体式蜂窝状V_(2)O_(5)-WO_(3)-TiO_(2)/堇青石催化剂进行SCR性能测试,其在350~500℃区间活性、耐C_(3)H_(8)、SO_(2)和H_(2)O反应催化活性均在80%以上,在350℃时稳定性均高于88%。通过粒径分析、SEM的表征结果表明,该配方制备的浆料能有效减少组分团聚作用,使其小于堇青石孔径,从而拥有较高的负载率和附着率。通过XPS、H_(2)-TPR和NH_(3)-TPD的表征结果表明,C_(3)H_(8)、SO_(2)和H_(2)O物质的加入会使促进反应的活性物质含量降低,与反应物竞争活性位点,从而降低催化剂氧化还原性能,进而影响催化剂催化活性。但在中高温区间,通过该配方制备的催化剂仍保持良好的酸性位和酸性数量,且与反应物竞争作用降低,从而在中高温度区间仍能保持良好的性能。本研究可为涂覆式蜂窝状催化剂的优化合成、提升其去除氮氧化物及抗中毒性能提供参考。In order to prepare a coated honeycomb SCR catalyst with excellent performance for efficient NO_(x)removal,orthogonal test was used to investigate its influence on the coating effect and SCR performance of the catalyst.The results showed that when the content of PVA and Tween-20 were 0.2%and 0.1%,respectively,and the pH was 1.5,the slurry had better load rate,adhesion rate and NO conversion rate.After obtaining the optimal formula,the SCR performance of the monolithic honeycomb V_(2)O_(5)-WO_(3)-TiO_(2)/cordierite catalyst was tested.The catalytic activity of C_(3)H_(8)、SO_(2)and H_(2)O were all greater than 80%in the range of 350℃to 500℃,and the stability was higher than 88%at 350℃.Finally,the characterization results by particle size analysis and SEM showed that the slurry prepared by this formulation effectively reduced the agglomeration effect of components to be smaller than the cordierite pore size,thus possessing a high loading and adhesion rate.The characterization results by XPS,H_(2)-TPR and NH_(3)-TPD showed that the addition of C_(3)H_(8)、SO_(2)and H_(2)O substances decreased the content of active substances that promoted the reaction and competed with the reactants for the active sites,thus reducing the catalyst redox performance and consequently affecting the catalytic activity.However,in the middle and high temperature intervals,the catalysts prepared by this formulation still maintained good acidic sites and acidic amounts with the reduced competition with reactants,thus maintaining good performance in the middle and high temperature intervals.This study can provid a reference for the optimal synthesis of coated honeycomb catalysts and improving the nitrogen oxide removal and anti-poisoning properties.

关 键 词：蜂窝状催化剂 涂覆 选择性催化还原 堇青石载体 正交实验 抗中毒性能 

分 类 号：X511[环境科学与工程—环境工程]