Promoting effect of Ce doping on catalytic performance and water resistance ability for toluene catalytic combustion over the cheap and efficient Mn8Ni2CeaOx catalysts

Abstract

A series of metal oxides Mn8Ni2CeaOx (a = 0–1.5) catalysts were prepared by hydrothermal co-precipitation to investigate the effect of Ce doping on manganese-based oxides for toluene catalytic combustion reaction. Activity evaluations show that Mn8Ni2CeOx (a = 1) catalyst exhibits highly efficient toluene oxidation activity and high yield to CO2 production. Durability tests reveal that it has remarkably superior water resistance ability and promising potential for practical application. Various characterizations were conducted to explore possible structure-activity correlations. Results show that Ce introduction could construct the strong Ce-Mn interactions, generate more oxygen vacancies, facilitate lattice oxygen mobility, and increase the content of surface active oxygen. These changes efficiently utilize active oxygen species and accelerate the deep oxidation of benzyl alcohol/benzoate intermediates, therefore render activity advantages. Otherwise, Ce doping can effectively maintain the catalyst's structural stability while simultaneously inhibiting H2O adsorption on the catalyst surface under humid atmosphere, thus being conducive to the outstanding durability and water resistance ability.