掺杂CaO对V_(2)O_(5)-MoO_(3)/TiO_(2)催化剂低温抗硫中毒性能的影响  

Performance of anti-sulfur poisoning at low temperature by CaO-doped V_(2)O_(5)-MoO_(3)/TiO_(2) catalysts

作　　者：刘海岩 王桂敏 蔡俐 刘小峰 林建伟 陈建军 李俊华[1,2] LIU Haiyan;WANG Guimin;CAI Li;LIU Xiaofeng;LIN Jianwei;CHEN Jianjun;LI Junhua(Research and Development Center of Environmental Engineering Technology in Yancheng,Tsinghua University,Yancheng 224000,China;National Engineering Center for Synergetic Control of Air Pollutants and Greenhouse Gases,Beijing 100084,China)

机构地区：[1]清华大学盐城环境工程技术研发中心,盐城224000 [2]清华大学大气污染物与温室气体协同控制国家工程研究中心,北京100084

出　　处：《环境工程学报》2025年第3期605-613,共9页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划(2022YFC3701600);国家自然面上基金资助项目(52070114)。

摘　　要：针对中低温工业窑炉烟气脱硝技术需求,采用等体积浸渍法,以V_(2)O_(5)为活性组分、MoO_(3)为助剂,制备了钙掺杂的高钒高钼含量的xCaO-V_(2)O_(5)-MoO_(3)/TiO_(2)(x为样品中为CaO质量百分数/%)脱硝催化剂。在微型固定床反应器中,对制备的xCaO-V_(2)O_(5)-MoO_(3)/TiO_(2)催化剂进行以NH_(3)为还原剂的选择性催化还原NO的反应活性及低温抗硫中毒性评价。结果表明,在反应气氛中通入H_(2)O和SO_(2)时,2CaO-V_(2)O_(5)-MoO_(3)/TiO_(2)催化剂具有较好的脱硝性能,且在180℃,通入H_(2)O和SO_(2),NH_(3)-SCR反应65 h以后,NOx转化率在85%以上,表明CaO掺杂可以有效提高催化剂的低温抗SO_(2)和H_(2)O中毒性能。采用BET、XRD、H_(2)-TPR、Raman、in situ DRIFTS等表征手段对制备的催化剂进行了进一步的表征分析,结果表明,CaO的掺杂可抑制SO_(2)与催化剂表面活性钒物种的反应,从而保护了催化剂表面的活性物种,进而抑制了表面钒物种的团聚。Considering the demand of flue gas denitrification technology in middle and low temperature industrial kilns,a series of xCaO-V_(2)O_(5)-MoO_(3)/TiO_(2) catalysts were prepared using incipient wetness impregnation method(x represents the mass percentage of CaO in the sample)when V_(2)O_(5) and MoO_(3) were taken as active components and additive,respectively.Its activity and anti-sulfur poisoning performance at low temperature were evaluated in a micro fixed bed reactor using NH_(3) as the reductant for the selective catalytic reduction of NO.The results showed that when H_(2)O and SO_(2) were introduced into the reaction atmosphere,the 2CaO-V_(2)O_(5)-MoO_(3)/TiO_(2) catalyst had a better denitrification performance,and after 65 hours of NH_(3)-SCR reaction at 180 oC,the NOx conversion rate was over 85%.The catalyst is identified to have an excellent resistance to the deactivation by SO_(2) and H_(2)O at middle-low temperatures.The prepared fresh and used catalysts were characterized by BET,XRD,H_(2)-TPR,Raman,in situ DRIFTS.The results showed that the doped CaO could inhibit the reaction between SO_(2) and the active vanadium species on the catalyst surface,then protecting them,thereby suppressing the aggregation of the surface vanadium species.

关 键 词：中低温脱硝 CaO掺杂 浸渍法 低温抗硫中毒 

分 类 号：X52[环境科学与工程—环境工程]