Uncatalysed and catalysed CO2 reaction using metal catalysts and binary vanadium mixtures supported on activated carbon

The kinetics of the reaction of CO2 with activated carbon without catalyst and impregnated with precursor salts of Mg, Ba, Pb, Cu and Fe and their bin ary mixtures were investigated. Binary mixtures of those metals with vanadi um oxide were also studied. The conversion of CO2 was studied (300 degreesC to 900 degreesC) using a TGA apparatus and a fixed bed reactor. The reacto r effluents were analysed using a GC-MS on line. CO was the main product to gether with some unreactant CO2. The best synergetic effects were observed for samples doped with Ba+V. Mg+V, Fe+V, Cu+V and Ba+Fe oxides. Adsorption of CO2 (20 degreesC to 100 degreesC) increased considerably in the presence of catalysts but binary oxide mixtures had no synergistic effects. In situ XRD was a useful tool for interpreting catalyst behaviour and identifying phases present during reaction conditions. The active phases appear to be m etal carbonates and/or metal oxide phases. (C) 2001 Elsevier Science Ltd. A ll rights reserved.