CAJ | 학술논문

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.
채용공침정법제비료CeO2, Co3O4화일계렬Co3O4/CeO2복합양화물최화제,재400°C하함SO2적양화기분중대최화제진행료류중독처리,통과원위홍외광보、X사선연사、정서승온탈부화X사선광전자능보대신선화류중독적양품진행료표정.결과표명,소유측시적류중독양품상균형성료류산염, CeO2상루적적류산염명현비Co3O4상적다, Co3O4/CeO2복합양화물재류중독과정중형성료류산고화류산시.대신선화류화양품재NO/O2기분하진행료최화탄흑연소실험,발현Co3O4/CeO2복합양화물적활성화항류성능우우CeO2,단항류성능저우Co3O4.
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 °C. 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.