The effect of the support and dispersion on the rate of surface reaction of CO hydrogenation over Rh catalyst was investigated by pulse surface reaction rate analysis (PSRA). TiO2, Al2O3, and SiO2 were used as the supports, and the dispersion of Rh was varied over a wide range by changing the Rh loading. The rate constants of C-O bond dissociation and the hydrogenation of the surface carbon species varied with the support and dispersion. The wavenumber of the IR absorption band due to linearly adsorbed CO also varied with the support and dispersion. The results are discussed in the light of more essential factors, such as the structure sensitivity, the electron property of Rh, and the pair site of metal-support suboxide. It was concluded that the electronic state of Rh is the predominant factor leading to the changes in the surface reaction rate constants with the support and dispersion.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry