https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27130 -1 mimicking the typical flow and conversion requirements of a catalytic system designed to treat a ventilation air methane stream. In order to gain a better understanding of the interaction between H₂O and the catalyst surface, temperature-programmed desorption of water over fresh and used samples were studied, and supported by other catalyst characterization techniques such as N₂-adsorption desorption, XRD, TEM, SEM and XPS analyses. The activity measurements of the catalysts studied identify Co₃O₄ as the most active material. Co-precipitating gold particles with cobalt oxide or iron oxide do not enhance the activity of the catalyst, which is most likely due to blocking the active site of support by the gold particle. The presence of strong hydroxyl bonds on the catalyst surface is substantiated by TPD and XPS analyses, and is suggested to be responsible for the rapid deactivation of Fe₂O₃ and Au/Fe₂O₃ catalysts.]]> Sat 24 Mar 2018 07:33:03 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23115 (v) or D₂O_(v) respectively, the rate of reaction decreases significantly in the presence of a high concentration of water vapour (ca 12,000 ppm) but the overall rate ratio, CH₄ / H₂O_(v) vs CD₄ / D₂O_(v) increases only slightly, to 3.2 ±0.6. This suggests that the effect of water vapour on the reaction rate is attributable to an equilibrium isotope effect (EIE) but under all reaction conditions studied at 270 °C, the rate limiting step involves methane activation.]]> Sat 24 Mar 2018 07:15:30 AEDT ]]>