Phase Coexistence of Multiple Copper Oxides on AgCu Catalysts during Ethylene Epoxidation

摘要: Alloy catalysts under reaction conditions are complex entities. In oxidizing atmospheres, multiple phases can coexist on a catalyst’s surface as result of phase segregation and preferential oxidation. Such scenario in unusual substoichiometric metastable that could play important roles catalytic processes. For instance, AgCu alloys—known to exhibit enhanced epoxide selectivity partial oxidation ethylene—form an oxide-like structure conditions. Under these conditions, copper oxides stable, while silver not. Consequently, segregates the alloy’s forms oxide overlayer. Little is known about or function such overlayers, it unknown whether they active role selectivity. order develop clearer picture catalysts, current work utilizes several situ spectroscopic microscopic techniques examine form when A...