Mg/Al物质的量比对Ce-La/MgAl_2O_4-x催化剂催化CO还原NO性能的影响（英文）  

Effect of Mg/Al molar ratios on NO reduction activity of CO using Ce-La/MgAl_2O_4-x catalysts

作　　者：郭丽丽[1] 刘璐[1] 祝晓琳[1] 张强[1] 李春义[1] GUO Li-li LIU Lu ZHU Xiao-lin ZHANG Qiang LI Chun-yi(State Key Laboratory of Heavy Oil Processing, China University of Petroleum （ East China） , Qingdao 266580, Chin)

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,山东青岛266580

出　　处：《燃料化学学报》2017年第6期723-730,共8页Journal of Fuel Chemistry and Technology

摘　　要：采用初始浸渍法制备了不同Mg/Al物质的量比的Ce-La/MgAl_2O_4-x催化剂,并通过低温N_2-吸附脱附、XRD、H_2-TPR和CO-TPR等手段对其进行了表征。结果表明,在Mg/Al物质的量比为0.5时,催化剂催化CO还原NO的性能最好。这主要是因为适量Mg的添加促进了CeO_2的分散和Ce-O-La固溶体的形成,从而使得表面Ce^(3+)和氧空穴增加。两者的协同作用使得Ce-La/MgAl_2O_4-0.5表现出最佳的催化性能。另外,适量Mg的引入可以抑制Ce(SO_4)_2和Ce_2(SO_4)_3的形成,从而提高了Ce-La/MgAl_2O_4-0.5催化剂抗硫中毒能力。A series of Ce-La/ MgAl2O4-x catalysts were prepared by the incipient wetness impregnation method and characterized by BET, XRD, H2-TPR,CO-TPR and in situ FT-IR. The results demonstrate that the catalyst with a Mg/Al molar ratio of 0. 5 yields the most uniform dispersion of CeO2 and greatly enhances formation of Ce-O-La solid solution, resulting in the increase of oxygen vacancy and surface Ce^3＋ content. Thereby,the synergistic effect between surface Ce^3＋ and oxygen vacancy gives rise to the best catalytic performance of NO reduction. Moreover, introduction of Mg species suppresses tranformation of CeO2 to Ce（ SO4）2/ Ce2（SO4）3 and then improves the SO2 resistance performance of Ce-La/MgAl2O4-0. 5.

关 键 词：NO还原 Ce-La/MgAl2O4-x Ce-O-La固溶体 抗硫中毒能力 

分 类 号：O643.36[理学—物理化学]