Catalysis Letters, Vol.128, No.1-2, 83-93, 2009
Physicochemical Characterization of Al2O3 Supported Ni-Rh Systems and their Catalytic Performance in CH4/CO2 Reforming
Activity and stability of alumina-supported monometallic Ni, Rh and bimetallic Ni-Rh catalysts were studied towards carbon dioxide reforming of methane. The catalysts were prepared by the incipient wetness impregnation method with different contents of Rh and Ni and were characterized by H-2 chemisorption, TPRH2, XRD, FT-IR and ToF-SIMS methods. The process of Ni-Rh alloy formation and nickel enrichment on alloy surface takes place during temperature-programmed hydrogen assisted decomposition of their precursors. Catalytic stability and resistance towards coke deposition for Rh/Al2O3 and Ni-Rh/Al2O3 catalysts are much higher than for Ni/Al2O3 and Ni-Rh/SiO2 systems, studied in the first part of this paper (JA(3)angstrom(o)wiak WK, Nowosielska M, Rynkowski JM, Appl. Catal. A 280:233, 2005).