We investigated the addition of chromium to alumina-supported Pt catalysts and its effect on catalytic activity in methane combustion. The Pt and Cr binary alumina-supported catalysts exhibited much higher activity than those without Cr. Alumina-supported Cr catalysts contain two chromium species, Cr 3+ and Cr 6+. From XPS analysis, it was found that more Cr 6+ species existed in the binary catalysts than in the single alumina-supported Cr catalysts. Pt species in the binary catalysts may promote Cr oxidation. Since Cr 6+ species are known to be more active than Cr3ff species in oxidation reactions, the increase in Cr 6+ in the binary catalysts may contribute to their higher activity compared with the Pt/Al 2O 3 catalyst.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)