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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。
The effects of the oxidation of CO on the oxidation of CO with the perovskite type catalyst 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) Catalytic activity and SO2 resistance were studied. The reducibility of the catalyst was investigated by TPR method. The adsorption of SO2 on the catalyst surface was investigated by FTIR. The results showed that the Mn perovskite catalyst catalyzed the CO as CO_2 and B The more the low-valent Mn ions, the stronger the adsorbability of oxygen to the catalyst, the lower the TPR temperature, the greater the reducibility of the catalyst and the better the catalytic activity. On the contrary, the strong adsorption of SO 2 on the B site of Mn ions causes the catalyst to adsorb oxygen Absence of catalyst causes irreversible inactivation.