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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.
๐ SIMILAR VOLUMES
03 Gaseous fuels (derived gaseous fuels) and CO-rich gas is used as fuel or for syntheses. Post-treatment or appropriate reaction conditions are used to solve the problems caused by Cl-, N-, or S-containing input materials.
from plants is seldom possible. This article reviews the options, covering both established commercial activities (such as starch, vegetable oil, paperpulp and natural fibres), as well as the extensive research and development activities that should lead to new crops, new products and new markets.