Methane Combustion over Pd/Al2O3 Catalyst: Effects of Chlorine Ions and Water on Catalytic Activity

✍ Scribed by Diannan GAO; Sheng WANG; Chunxi ZHANG; Zhongshan YUAN; Shudong WANG

• Publisher: Elsevier Science
• Year: 2008
• Weight: 640 KB
• Volume: 29
• Category: Article
• ISSN: 1872-2067
• DOI: 10.1016/s1872-2067(09)60027-9

✦ Synopsis

The influences of residual chlorine ions and water on the performance of a Pd/Al 2 O 3 catalyst in methane combustion have been studied. The results show that the catalyst containing Cl exhibits a relatively low activity, and the addition of water to the reaction system accelerates the deactivation process. The catalyst has been characterized by N 2 adsorption, X-ray fluorescence, Fourier transform infrared spectroscopy (FT-IR), and thermogravimetry (TG). The results show that the presence of Cl appears to strongly inhibit the total oxidation of methane and hinder the dispersion of Pd on Al 2 O 3 . The formation of Pd(OH) 2 during the reaction is the most likely reason for the inhibition effect of water, which is confirmed by FT-IR and TG analysis. The regeneration of the Pd/Al 2 O 3 catalyst can be achieved by purging in nitrogen at 550 °C.