A TiO2 (100) single crystal surface covered with 5Å Ni was used as a model supported catalyst to study effects of strong metal-support interaction(SMSI) on CO chemisorption and the CO hydrogenation reaction. Auger and C Is peak height measurements showed that CO chemisorption on Ni/TiO2 (100) is suppressed by 2.5 times compared to that on Ni(111). In situ CO hydrogenation studies o showed that the specific methanation activity from 5Å Ni/TiO2 (100) is ∼3.0–3.5 times that from Ni (111). No H2/D2 isotope effect was found for methane production on both Ni(111) and Ni/TiO2 (100), while the higher molecular weight product formation showed an inverse isotope effect on Ni(111) and a normal isotope effect on Ni/TiO2 (100). A qualitative explanation was proposed to account for the SMSI and the isotope effects.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry