Abstract:
The reforming of CH4 with CO2 was studied at 800℃ over Pt/ZrO2 catalysts. The CH4:CO2 concentration ratio of 2:1 and GHSV of 477500 h-1 were used to observe catalyst deactivation. The effects of two promoters, Ce and Y, on the catalyst activity and stability were investigated. The results showed that the addition of the promoters, at the optimum concentration of 5%, not only increased the catalyst surface area by stabilizing the tetragonal form of ZrO2 but also improved the catalyst stability. The mixed-promoter catalytic behavior was also studied. The mixed-promoter catalysts were prepared by two different techniques, impregnation and co-precipitation. Comparison of the results indicated that at the calcination temperature of 800℃ the impregnation technique yielded higher surface area, activity and stability than the co-precipitation technique. The surface area, activity and stability of the catalysts prepared by the co-precipitation technique were improved when the calcination temperature was decreased to 600℃
