The effect of a post-synthesis treatment of 7.5 wt% CuO-CeO₂ catalyst with acid solutions on its performance towards the preferential oxidation of CO reaction was investigated. The acidic environment was found to affect the redox and catalytic properties of this solid composition. In particular, modification at low pH (< 4) provided the required amount of acid which led to better dispersion of the active copper species, higher concentration of surface Ce³⁺ species, an increased concentration of oxygen vacancies and higher reducibility of the solid catalyst. These characteristics were found to be critical for the promotion of the catalytic activity and selectivity in the title process.

研究了用酸溶液对7.5 wt％CuO-CeO ₂催化剂进行后合成处理对其对CO反应优先氧化的性能的影响。发现酸性环境影响该固体组合物的氧化还原和催化性能。特别地，在低pH（<4）下进行改性可提供所需量的酸，从而导致活性铜物质的分散度更高，表面Ce ³⁺物质的浓度更高，氧空位的浓度增加以及固体催化剂的还原性更高。发现这些特征对于在标题过程中促进催化活性和选择性是至关重要的。