Abstract: The washcoat deposited on a ceramic honeycomb was prepared with modified γ-Al₂O₃ and pseudo boehmite. The effect of gel solid content on the gel viscosity and coating ability was investigated.The monolithic catalysts were made with noble metal being active component, cordierite and modified γ-Al₂O₃ being the first and second carriers. The effects of Pd content and deoxidation on the monolith catalyst performance, the effects of the cyclic period, and preheated temperature on the operation performance of reactor were investigated. Result show that the quantity supported Pd of coating layer being 1.5% and the coating of solid content being 20% was the best. The methane conversion attained85% when the catalyst preheat temperature was 450 ℃, space velocity was 15 000 h^-1, and reversing cycle was 10 min.