Synthesis Gas Production in Oxy-Carbondioxide Reforming of Methane Over Perovskite Catalysts

Abstract

Consuming two major greenhouse gases, carbon dioxide (CO2) and methane (CH4), to produce synthesis gas, which is a mixture of carbon monoxide (CO) and hydrogen (H2), carbondioxide reforming of methane shows significant environmental and economic benefits. Recently the development of Oxy-CO2 reforming of methane (OCM) has been investigated to produce syngas. OCM consists of both exothermic partial oxidation of methane and endothermic CO2 reforming of methane , which is expected to increase the energy efficiency of the process and also to adjust the H2/CO ratio of syngas for particular applications. However, the process has not found wide industrial application due to severe catalyst deactivation, basically caused by carbon formation. Therefore, it is of great interest to develop stable catalysts without severe deactivation. This review paper is mainly focused on the development of perovskites to achieve stable operation for oxy-CO2 reforming of CH4. The use of precursors such as perovskite like oxides ABO3, in which A-site cation is a rare earth and/or alkaline earth and B-site cation is a transition metal has increased recently for methane reforming. Perovskites not only fulfill the stability requirements for these reactions, but also by further reduction of B-site cations which remain distributed in the structure, they form well dispersed and stable metal particle catalysts.