水热老化对Cu改性的W/CeTi催化剂NH_(3)-SCR性能的影响  

Effect of hydrothermal aging on NH3⁃SCR performance of Cu⁃modified W/CeTi catalyst

作　　者：高文翔 文婕[1] 邓杰 徐海迪 陈永东[1,3] GAO Wen‑Xiang;WEN Jie;DENG Jie;XU Hai‑Di;CHEN Yong‑Dong(College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu,Sichuan 610207,China;Tianfu Yongxing Laboratory,Chengdu,Sichuan 610213,China)

机构地区：[1]西南石油大学化学化工学院,成都610500 [2]四川大学新能源与低碳技术研究院,成都610207 [3]天府永兴实验室,成都610213

出　　处：《无机化学学报》2023年第10期1877-1886,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.22272132,22202160);四川省自然科学基金(No.2022NSFSC1041);四川省中央引导地方科技发展专项(No.2021ZYD0044)资助资助。

摘　　要：采用浸渍法制备了CuW/CeTi和W/CuCeTi催化剂,考察了催化剂中Cu的不同作用方式对氨气选择性催化还原NO_x(NH_(3)-SCR)反应脱硝性能的影响。新鲜的CuW/CeTi和W/CuCeTi在低温下显示出优异的活性。经过800℃、10 h水热老化后,W/CuCeTi表现出比CuW/CeTi更优异的脱硝性能,证明W/CuCeTi具有更高的水热稳定性。通过透射电子显微镜(TEM)、X射线衍射(XRD)、拉曼光谱(Raman)、N_(2)物理吸附-脱附、X射线光电子能谱(XPS)、氨气程序升温脱附(NH_(3)-TPD)和氢气程序升温还原(H_(2)-TPR)表征,发现Cu的掺杂形成的Cu-O-Ce结构能够提高CeTi的抗烧结能力,同时削弱W-CeO_(2)相互作用,抑制老化过程中Ce_(2)(WO_(4))_(3)物质的形成,使W/CuCeTi表现出更优异的水热稳定性。CuW/CeTi and W/CuCeTi catalysts were prepared by impregnation method.The effects of different action modes of Cu on denitrification performance of NH_(3)selective catalytic reduction of NOx(NH_(3)‑SCR)reaction were investigated.Studies showed that fresh CuW/CeTi and W/CuCeTi exhibited excellent activity at low temperature.After 800℃and 10 h hydrothermal aging,W/CuCeTi showed better denitration performance than CuW/CeTi,which proves that W/CuCeTi has higher hydrothermal stability.Then,these catalysts were characterized by transmission electron microscope(TEM),X‑ray diffraction(XRD),Raman spectrum(Raman),N_(2)physical adsorptiondesorption,X‑ray photoelectron spectroscopy(XPS),ammonia temperature‑programmed desorption(NH_(3)‑TPD)and hydrogen temperature‑programmed reduction(H2‑TPR).It was found that the Cu‑O‑Ce structure formed by Cu doping can improve the anti‑sintering ability of CeTi,weaken the interaction of W‑CeO2,and thus inhibits the formation of Ce2(WO4)3 in the aging process.Therefore,W/CuCeTi shows better hydrothermal stability.

关 键 词：W/CuCeTi催化剂 NH_(3)-SCR 水热老化 Ce_(2)(WO_(4))_(3) 

分 类 号：O643[理学—物理化学]