CO Hydrogenation and Adsorption Studies on Supported Nickel SMSI Catalysts.
Technical rept. no. 42, 1 Jan-31 Dec 85,
TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
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The uptake of CO by NiTiO2 and NiTi2O3 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 NiCO4 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 NiTiO2 or NiTi2O3. Methanation activity at 275C was approximately a factor of 2 greater for the NiTiO2 LT than the NiTO2 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 TiO2 supported catalysts is not due to the presence or absence of a strong metal-support interaction condition of the TiO2 but to other properties of TiO2 as compared to other supports. Author
- Inorganic Chemistry