A Comparative Study of the Effects of Water on Methane Oxidation over Pd@CeO2/Al2O3 and Pd@TiO2/Al2O3 Catalysts

摘要

The development of a highly active catalyst for methane oxidation would have a significant impact on a number of energy-based technologies. In this work a comparative investigation of the catalytic performers of supported Pd@TiO2 and Pd@CeO2 for the application of methane oxidation have been presented. Catalytical activity of Pd@CeO2/Al2O3 was different than that of Pd@TiO2/Al2O3 catalyst. Under dry conditions Pd@CeO2/Al2O3 was more active than Pd@TiO2/Al2O3 where 100 % conversion of methane was achieved at 450°C, whereas for Pd@TiO2/Al2O3 complete oxidation of methane occurred at 570°C. in both cases addition of water into the feed resulted in a shift of methane conversions to higher temperatures, these effects were more detrimental over Pd@TiO2/Al2O3 catalyst where there was an exceptional decrease in methane conversions. In both cases increase in partial pressure of water resulted in increased deactivation of the catalysts.