Structure characterization of the Co and Ni catalysts for carbon dioxide reforming of methane

The effects of active components, promoters and reforming reaction on struc ture variation of catalysts for carbon dioxide reforming with methane are e xtensively investigated. It is found that the active component and promoter s disperse in different sites on the support. The impregnated metal species may be mainly located on the inner surface of the micropore of the support . The 8.5%Ni-2%MgO-3%CeO2/Al2O3 catalyst achieves best metal dispersion amo ng the tested catalysts. It is also interesting to note that the addition o f the alkaline oxide promoter (MgO) prohibits the metal dispersion on the s upport, while the addition of rare-earth metal oxide CeO2 effectively promo tes the Ni metal dispersion on the surface of the support despite of unsati sfactory self-dispersion of CeO2 promoter. (C) 2001 Elsevier Science B.V. A ll rights reserved.