Journal of the Chemical Society - Faraday Transactions p. 3671 - 3677 (1990)
Update date:2022-08-11
Topics:
Albers, Peter
Seibold, Klaus
Thampi, K. Ravindranathan
Graetzel, Michael
Kiwi, John
Palladium oxide and TiO2-supported palladium oxide, prepared by the deposition-precipitation technique were reduced using CH4 at temperatures greater than 300 deg C.Other oxides, such as PtO2, PtOx/TiO2, Co3O4/TiO2 and Fe2O3 were also used.These oxides showed varying degrees of reduction.During reduction, CH4 was oxidised and the reaction products (CO, CO2, H2O(g) and H2) were identified by gas chromatography.The results indicate that CH4 is capable of causing deep-level redox reactions in the bulk by diffusing through the catalyst surface.Palladium and platinum oxides were found to be suitable materials for such reduction treatment s.The most active catalysts were characterized by diffuse reflectance spectroscopy (DRS), elemental analysis, X-ray photo-electron spectroscopy (XPS) and transmission electron microscopy (TEM).Formation of Pd with different oxidation states was noted on the surface of the reduced catalyst.Unlike Pd-based catalysts, PtO2/TiO2 samples showed a stabilisation of Ti(3+) on the catalyst surface.
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