Abstract
The uptake of CO by Ni TiO 2 and Ni Ti 2O 3 was investigated at 25 and 125 °C following low-temperature (LT = 250 °C) and high-temperature (HT = 450 °C) reduction. Infrared spectroscopy was used to identify the onset of nickel carbonyl (Ni(CO) 4) formation under various conditions of temperature and pressure. The CO uptake data were modeled using the Langmuir equation for isothermal adsorption. Monolayer coverages and equilibrium constants for CO adsorption were obtained from the uptake data. Carbon monoxide monolayer coverages were not affected by the reduction temperature of either Ni TiO 2 or Ni Ti 2O 3 . Methanation activity at 275 °C was approximately a factor of 2 greater for the Ni TiO 2 (LT) than the Ni TiO 2 (HT) catalyst. This correlated well with the relative strength of the CO-metal surface bond, which also decreased by a factor of approximately 2. These findings suggest that the enhanced methanation rate observed on TiO 2-supported catalysts is not due to the presence or absence of a strong metal-support interaction condition of the TiO 2 but to other properties of TiO 2 as compared to other supports.
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