Influence of the composition of the oxide coating and method of preparation of block catalysts on their activity in the deep oxidation of methane

Abstract

Catalysts for deep oxidation of methane were studied using the methods of X-ray diffraction, thermal desorption of nitrogen and temperature-programmed reduction with hydrogen. These catalysts comprise oxides of 3d-metals (Mn, Co), rare earth (La) and alkaline earth (Ba, Sr) elements in a porous matrix of secondary supports (Al2O3, ZrO2, their binary composition) formed on the surface of the honeycomb structure blocks (cordierite, kaolin – aerosil ). It is shown that the activity and stability of the catalysts depends on the way of preparation, the nature of the active ingredient, and the block of secondary carriers. Suggested catalysts provide 80–100 % conversion of methane to CO2 at temperatures 650–750 °C, and can be recommended for use in the catalytic purification of gases from impurities hydrocarbons (methane and homologous С2–С4), and for burning a hydrocarbon fuel in industrial and household catalytic heat generators.