Perovskite-type mixed oxides as catalyst for syngas production by methane conversion

Abstract

The name perovskite is related to ceramic compounds that contain metallic and non-metallic elements, well-defined crystal structure and its most abundant molecular formula is ABO3, where usually A refers to an alkali metal, alkaline earth metal or a lanthanide and B to a transition metal. These solids can exhibit interesting properties such as high catalytic activity, superconductivity, ferromagnetism, appreciable thermal stability and conductivity. The intrinsic characteristics of each perovskite are dependent on their elements, as well on the method used for its preparation. One of the most attractive reasons for the use of perovskites as catalysts is that under appropriate reductive conditions the perovskite's metal particles are highly dispersed in the oxide matrix (AOX), solving usual catalytic drawbacks such as sintering of metal particles and carbon deposition. This ability and high thermal stability makes the perovskites promising catalysts for reforming and oxidation of methane, as described in the presented literature. Therefore, they are attractive alternatives to classic catalysts traditionally used in these respective reactions such as supported nickel and noble metals.