CO2 reforming of methane over vanadia-promoted Rh/SiO2 catalysts

• Publisher: Elsevier Science
• Year: 2001
• Weight: 178 KB
• Volume: 42
• Category: Article
• ISSN: 0140-6701
• DOI: 10.1016/s0140-6701(01)80224-1

✦ Synopsis

03 Gaseous fuels (derived gaseous fuels) Kinetic test reactions over a temperature range of 723 to 773 K of methane reforming with carbon dioxide was performed over rhodium dispersed on silica, Rh/SiOz, and vanadia-promoted silica, Rh/VOd SiOz. Transmission infrared spectroscopy was applied to observe the interaction of COz with the catalysts and the formation of surface intermediates during the C0zCH4 reforming reaction. XP spectroscopy and TPO was carried out to analyse the carbon deposition. It has been shown that the promotion of Rh/SiOz catalysts with vanadium oxide enhances the catalytic activity for COz reforming of methane and decreases the deactivation by carbon deposition. This is attributed to the formation of a partial VO, overlayer on the Rh surface, which reduces the size of accessible ensembles of Rh atoms required for coke formation and creates new sites at the Rh-VO. interfacial region that are regarded as active sites for carbon dioxide activation and dissociation.