铈掺杂对钒催化剂催化氧化SO_(2)性能的促进机理研究  

Study on the promoting mechanism of cerium on catalytic oxidation of SO_(2)over vanadium catalyst

作　　者：彭瑶瑶 宋磊 钟山 唐思扬 梁斌[1,2] PENG Yao-yao;SONG Lei;ZHONG Shan;TANG Si-yang;LIANG Bin(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学新能源与低碳技术研究院,四川成都610065

出　　处：《应用化工》2023年第2期315-320,共6页Applied Chemical Industry

基　　金：国家自然科学基金项目(22108184)。

摘　　要：采用超声浸渍法制备了氧化铈掺杂前后的V/SiO_(2)和x%Ce-V/SiO_(2)催化剂,利用BET和XRD对催化剂的物化性质进行表征,结合原位Raman技术探究CeO_(2)对钒催化剂实际催化过程的影响,并测定了两组催化剂的SO_(2)氧化转化率。结果表明,4%氧化铈掺杂时钒催化剂的孔径分布得到改善,同时有利于促进活性物质(V^(Ⅴ)O)_(2)O(SO_(4))_(4)^(4-)的生成,并提高五价钒的价态稳定性,避免熔融相中活性物种的损失,4%Ce-V/SiO_(2)催化剂在450℃和425℃的SO_(2)转化率分别比V/SiO_(2)催化剂提升了11.7%和30.1%,且在500~450℃的温度范围内维持着高于90%的转化率。The vanadium catalysts V/SiO_(2)and x%Ce-V/SiO_(2)catalysts were prepared by ultrasonic impregnation method,and characterized by BET and XRD,and investigated the effect of CeO_(2)on the actual catalytic process of vanadium catalyst through in situ Raman technology.The catalytic activity of SO_(2)to SO_(3)were investigated.Results indicated that the introduction of cerium oxide optimizes the pore size distribution of vanadium catalyst,promotes the formation of active substance(V^(Ⅴ)O)_(2)O(SO_(4))_(4)^(4-),and improves the valence stability of VⅤspecies,thus avoiding the loss of active species from the molten phase.The 4%Ce-V/SiO_(2)catalyst improves the SO_(2)conversion by 11.7%and 30.1%at 450℃and 425℃,respectively,compared with V/SiO_(2)catalyst.And it also maintains the SO_(2)conversion higher than 90%in the temperature range of 500~450℃.

关 键 词：氧化铈 钒催化剂 SO_(2)氧化 原位拉曼 

分 类 号：TQ111.16[化学工程—无机化工]