摘要: Carbon monoxide (CO) in cigarette smoke is a product of tobacco pyrolysis and combustion. The purpose of this study was to investigate the effects of simultaneous substitutions of Ce⁴⁺ and Cu²⁺ in LaFeO₃ perovskites on catalytic activity for CO oxidation. La_1-xCe_xFe_1-yCu_yO₃ perovskites were prepared from citrate,and the bulk structure and the surface properties were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction in H₂ (H₂-TPR). It was observed that, when La³⁺ (A-site) and Fe³⁺ (B-site) of LaFeO₃ perovskites were partially substituted by Ce⁴⁺ and Cu²⁺, the catalytic activity was greatly improved. La_0.7Ce_0.3Fe_0.9M_0.1O₃ showed the best catalytic activity for oxidation of CO in the presence of O₂. When A-site (La³⁺ ) of LaFeO₃ perovskites was partially substituted by Ce⁴⁺, the catalytic oxidation activity was directly correlated with its redox properties, which indicated that the catalytic oxidation reaction on the La1-xCexFeO3 perovskites followed the process of intrafacial reactions. When A-site (La³⁺ ) and B-site (Fe³⁺ ) of LaFeO₃ perovskites was simultaneously substituted by Ce⁴⁺ and Cu²⁺, its catalytic oxidation activity was closely correlated with both the anion defect concentration and redox properties, which indicated that the catalytic oxidation reaction on the La_1-xCe_xFe_1-yCu_yO₃ perovskites followed both suprafacial process and intrafacial reactions.