Catalytic Combustion of Methane over Co 1−xMg xO/Al 2O 3/FeCrAl Monolithic Catalysts

Abstract

A series of Co 1−xMg xO/Al 2O 3/FeCrAl catalysts ( x=0−1) were prepared. The structures of the catalysts were characterized using XRD, SEM, and TPR analyses. The catalytic activity of the catalysts for methane combustion was evaluated in a continuous flow microreactor. The results indicated that the active washcoats adhered well on the FeCrAl foils. The phases in the catalysts were Co 1−xMg xO solid solutions, α-Al 2O 3, and γ-Al 2O 3. The surface particle size of the catalysts varied with variations in the molar ratios of Co to Mg. The Co component of the Co 1−xMg xO/Al 2O 3/FeCrAl catalysts played an important role in the catalytic activity for methane combustion. In the Co 1−xMg xO/Al 2O 3/FeCrAl ( x=0.2−0.8), the catalytic activity in terms of x was in the order of 0.5>0.2>0.8 under the experimental conditions. The presence of Mg in these catalysts could promote the thermal stability to a large extent. There were strong interactions between the Co 1−xMg xO and the Al 2O 3/FeCrAl supports.