硫中毒对Co_3O_4/CeO_2 复合氧化物上炭黑催化燃烧的影响（英文）  

Effect of sulfur poisoning on Co_3O_4 CeO_2 composite oxide catalyst for soot combustion

作　　者：石晓燕[1] 余运波[1] 薛莉[2] 贺泓[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]山东理工大学化学工程学院,山东淄博255049

出　　处：《催化学报》2014年第9期1504-1510,共7页

基　　金：supported by the National Basic Research Program of China (973 Program,2010CB732304);the State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex (SCAPC201302)~~

摘　　要：采用共沉淀法制备了CeO2,Co3O4和一系列Co3O4/CeO2复合氧化物催化剂,在400°C下含SO2的氧化气氛中对催化剂进行了硫中毒处理,通过原位红外光谱、X射线衍射、程序升温脱附和X射线光电子能谱对新鲜和硫中毒的样品进行了表征.结果表明,所有测试的硫中毒样品上均形成了硫酸盐,CeO2上累积的硫酸盐明显比Co3O4上的多,Co3O4/CeO2复合氧化物在硫中毒过程中形成了硫酸钴和硫酸铈.对新鲜和硫化样品在NO/O2气氛下进行了催化炭黑燃烧实验,发现Co3O4/CeO2复合氧化物的活性和抗硫性能优于CeO2,但抗硫性能低于Co3O4.CeO2, Co3O4, and a series of Co3O4/CeO2 composite oxides prepared by co-precipitation were ex-posed to SO2 under an oxidizing environment at 400 ℃. These fresh and SO2-poisoned samples were characterized by in situ diffuse reflectance infrared Fourier transform spectroscopy, X-ray diffraction, temperature-programmed desorption, and X-ray photoelectron spectroscopy. Sulfates were formed on the oxides, with more sulfates on CeO2 than on Co3O4. On the Co3O4/CeO2 composite oxides, both cobalt sulphate and ceria sulfate were formed. Fresh and sulfated samples were tested for soot combustion in a NO/O2 gas flow. The Co3O4/CeO2 composite oxides showed better SO2 tol-erance and higher activity than CeO2 but were more easily poisoned by SO2 than Co3O4.

关 键 词：炭黑氧化 氧化钴 氧化铈 复合氧化物 硫中毒 

分 类 号：O643.362[理学—物理化学]