CO Hydrogenation and Adsorption Studies on Supported Nickel SMSI Catalysts.
Abstract
The uptake of CO by Ni/TiO2 and Ni/Ti2O3 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/TiO2 or Ni/Ti2O3. Methanation activity at 275C was approximately a factor of 2 greater for the Ni/TiO2 (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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1985
- Accession Number
- ADA160522
Entities
People
- J. G. Ekerdt
- J. Michael White
- S. M. Fang
- T. J. Campione
Organizations
- University of Texas at Austin