Factors Analysis of Pd/TiO₂ Catalyst Deactivation in the Process of the Methane Catalytic Combustion

Shan Ming, Guo Yun, Wu Dongfang, Zhong Qinghua, Lu Guanzhong^*
(Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237)

Abstract In this paper, two kinds of TiO₂ are used as supports of palladium catalysts. Results of XRD and BET indicate that the changing of the crystal structure and the loss of the surface area are the main reasons for the decrease of the catalytic activity. It is found that the existence of the rutile phase and the reaction gas accelerate the phase transformation from rutile to anatase in TiO₂ prepared by combustion method. It is also revealed that TiO₂ with a pure anatase structure has a high thermal stability.
Key words Pd catalyst, CH₄ catalytic combustion, TiO₂