钨镧复合氧化物催化CO还原NO的性能  

Catalytic performance of tungsten lanthanum composite oxide for reduction of NO by CO

作　　者：黄傲寒 迟姚玲[1] 郑晓妍 靳广洲[1] 张传驹 HUANG Aohan;CHI Yaoling;ZHENG Xiaoyan;JIN Guangzhou;ZHANG Chuanju(Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,School of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Sinopec Jinan Refining&Chemical Company,Jinan 25000,China)

机构地区：[1]北京石油化工学院,新材料与化工学院,燃料清洁化及高效催化减排技术北京市重点实验室,北京102617 [2]中国石油化工股份有限公司济南分公司,山东济南25000

出　　处：《石油化工》2023年第9期1185-1191,共7页Petrochemical Technology

摘　　要：采用柠檬酸络合法制备了钨镧复合氧化物催化剂W_(m)La_(n)O,采用XRD,H_(2)-TPR,XPS对其进行了表征,研究了它催化CO还原NO反应的性能。实验结果表明,在W_(m)La_(n)O制备过程中,WO_(3)与La_(2)O_(3)之间共生共存、相互作用,La^(3+)进入到WO_(3)晶格中取代部分W^(n+),引起WO_(3)晶格畸变、非完整性增加,导致WO_(3)晶胞膨胀、平均晶粒度减小;La的加入使W_(m)La_(n)O中的W^(5+)含量和表相吸附氧含量增加,H_(2)-TPR还原峰温度向低温偏移,明显提高了它催化CO还原NO的能力;在气时空速为1800 h^(-1)、温度为500℃的反应条件下,W_(9)La_(1)O的CO转化率达到20.52%、NO转化率达到59.53%,较WO_(3)分别提高了约10百分点和28百分点。W_(m)La_(n)O composite oxide catalyst was prepared by citric acid complexing method and characterized by XRD,H_(2)-TPR and XPS.The catalytic performance of W_(m)La_(n)O for reduction of NO by CO was studied.The experimental results show that during the preparation of W_(m)La_(n)O composite oxide,WO_(3)and La_(2)O_(3) coexist and interact with each other.La^(3+)enters the WO_(3)lattice to replace some W^(n+),causing WO_(3)lattice distortion and non-integrity increase,resulting in WO_(3)cell expansion and average grain size reduction.The addition of La increases the content of W^(5+)and surface adsorbed oxygen in W_(m)La_(n)O composite oxides,and the temperature of H_(2)-TPR reduction peak shifts to the low temperature region,which significantly improve the catalytic reduction of NO by CO.Under the reaction conditions of GHSV 1800 h^(-1)and temperature 500℃,the CO conversion of W_(9)La_(1)O reaches 20.52%,and the NO conversion reaches 59.53%,which are about 10 percentage points and 28 percentage points higher than those of WO_(3),respectively.

关 键 词：氧化钨 复合氧化物 共生共存 相互作用 氧化还原反应 

分 类 号：TQ426.8[化学工程]