摘要
考察了Mn系钙钛矿型催化剂La_(1-x)Sr_xMn_(1-y)Me_yO_3(x=0,0.1,0.2,0.3,0.4;y=0,0.2,0.4,0.6)对CO完全氧化的催化活性及耐SO_2性,用TPR方法研究了催化剂的可还原性,用FTIR研究了SO_2在催化剂表面上的吸附,结果表明:Mn系钙钛矿型催化剂按吸附机理催化CO为CO_2,B位低价态Mn离子越多,催化剂吸附氧能力越强,TPR温度越低,催化剂可还原性越大,催化活性越好;反之,相反,SO_2强吸附在B位Mn离子上,使催化剂吸附氧能力消失造成催化剂不可逆失活。
Catalytic activity and SO2 resistance of a series of Mn-based perofskite type catalysts,La1-xSrxMn1-yMeyO3,(x = 0,0.1,0.2,0.3,0.4;y = 0,0.2,0.4,0.6),have been investigated.Their reducibility has been studied by means of TPR method.Adsorption of SO2 on catalysts' surface has been studied by means of FTIP.Those results showed: Mn-based perofskite type catalysts catalyzied CO to CO2 following adsorption mechanism.The more the low valence Mn ions were,the stronger theability of catalysts' adsorbing oxygen was,the lower the TPR temperature was,the higher the reducibility of catalysts was and the better the activity of catalysts was as well.SO2 strongly adsorbed on Mn ions of B site incapacitated catalysts from adsorbing oxygen and made catalysts irreversibly inactive.
出处
《北京工业大学学报》
CAS
CSCD
1992年第1期83-88,共6页
Journal of Beijing University of Technology
关键词
锰系
钙钛矿型
氧化物
催化剂
Mn-based perofskite,catalytic oxidation,SO_2 poisoning
