CeO2-WO3催化剂表面酸性和氧化还原性能在脱硝反应中的研究  

Investigation of the surface acidity and redox on the CeO_(2)-WO_(3) catalyst for selective catalytic reduction with NH3

作　　者：康海彦[1] 莫杜娟 张学军[2] 张梦茹 高洪润 毛艳丽[1] 李海洋[2] 宋忠贤 KANG Hai-yan;MO Du-juan;ZHANG Xue-jun;ZHANG Meng-ru;GAO Hong-run;MAO Yan-li;LI Hai-yang;SONG Zhong-xian(School of Municipal and Environmental Sciences,Henan University of Urban Construction,Pingdingshan City,Pingdingshan 467036,China;School of Environmental Science and Safety Engineering,Shenyang University of Chemical Technology,Shenyang City,Shenyang 110142,China)

机构地区：[1]河南城建学院市政与环境学院,河南平顶山467036 [2]沈阳化工大学环境科学与安全工程学院,辽宁沈阳110142

出　　处：《燃料化学学报（中英文）》2023年第6期812-822,共11页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21872096);河南省青年自然科学基金(202300410034);河南城建学院骨干教师项目(YCJQNGGJS201903);河南城建学院学术带头人项目(YCJXSJSDTR202204);平顶山市2021年重大科技专项(2021ZD03);河南城建学院博士启动基金(990/Q2017011)资助。

摘　　要：本研究利用原位合成法成功制备CeO_(2)-WO_(3)催化剂并用于脱硝反应,焙烧温度为550℃的CW-550催化剂活性最佳,200℃时CW-550脱硝活性达到90%以上。CW-550催化剂具有优越的催化剂性能可归结为较大的比表面积、较多的Ce^(3+)物种、丰富的表面酸性和优越的氧化还原性能。Ce3+增多,有利于氧空位的形成,可促进氧化还原性能。WO3的引入,在550℃的焙烧条件下可显著提升催化剂的Brönsted酸量,有利于氨气的吸附与活化,提升其催化性能。CW催化剂上吸附的NH3物种能与气态的NO反应,而吸附态的NH3与吸附态的NOx不能进行高效反应,因此,CW催化剂的SCR反应主要遵循Eley-Rideal反应机理。CeO_(2)-WO_(3) catalysts were successfully prepared by in-situ synthesis and used in the denitrification reaction.The best activity of CW-550 catalyst was achieved at a roasting temperature of 550℃,and the denitrification activity of CW-550 reached over 90%at 200℃.The superior catalytic performance of CW-550 catalyst can be attributed to the large specific surface area,more Ce3+species,abundant surface acidity and superior redox performance.The increased Ce3+facilitates the formation of oxygen vacancies and promotes redox performance.The introduction of WO_(3),into CeO_(2)can enhance the amounts of Brönsted acid,which contributes to the improvement of the adsorption and activation of ammonia,resulting in the excellent catalytic performance.The NH3-adsorbed species can react with gaseous NO.However,both of NH3-adsorbed and NO-adsorbed sepcies cannot participate in the SCR reaction effectively.Therefore,the SCR reaction of CW catalysts mainly follows the Eley-Rideal mechanism.

关 键 词：CeO_(2)-WO_(3) 焙烧温度 脱硝 表面酸性 

分 类 号：O643[理学—物理化学]