Abstract: For dry reforming of CH4, the effects of defect structure of the surface/subsurface layers of Ce-Zr-La(Ca)-O and Ce-Sm-O nanodispersed fluorites after supporting Pt, Pt+Pd and Pt+Ni+La and their diffusion parameters are considered. For these materials, besides the activation of CH4 on small (1-2 nm) uncovered Pt0 clusters, additional route of both reagents activation is proposed. Complex cluster defect containing Pt δ+/2+ species and interstitial oxygen-isolated anion vacancy pairs facilitates conjugation of CH4 activation and oxygen insertion for CO production. Oxygen diffusion parameters affect the efficiency of this process.

Cite: Kuznetsova T. , Alikina G. , Paukshtis E. , Korenev S. , Sadykov V.
Pt-Supported Ceria-Based Nanocrystalline Catalysts of CH4 Dry Reforming: Effect of Support Composition/Defect Structure and Ni/Pd Additives
9th Natural Gas Conversion Symposium 30 May - 3 Jun 2010