Progress on the selective catalytic reduction of NOx with methane over solid super acid and metal oxidesbased catalysts

Key words: 
• methane /
• selective catalytic reduction /
• nitric oxides /
• solid super acid /
• metal oxides

Abstract: Selective catalytic reduction of NOx with methane (CH4-SCR) has been deemed as a promising method to replace NH3-SCR because methane is low cost and easily obtained. Zeolite based catalysts have been widely researched because of their high catalytic activity. However, the hydrothermal stability of these catalysts is unsatisfied, which makes the none-zeolite based catalyst received considerable attention recently. In this paper, advances in supported nonezeolite catalysts for CH4-SCR are reviewed, especially focused on the catalytic activity, reaction mechanism and the promotion effect of the two types of catalysts based respectively on solid super acid and metal oxides. With the comparison of the properties of these catalysts, the application and further research direction on CH4-SCR are proposed.