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Reduction of Supported and Unsupported Palladium Oxide Catalysts using Methane Characterization of Active Oxides

DOI: 10.1039/ft9908603671

Source and publish data:

Journal of the Chemical Society - Faraday Transactions p. 3671 - 3677 (1990)

Update date:2022-08-11

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Authors:

Albers, PeterAlbers, Peter

Seibold, KlausSeibold, Klaus

Thampi, K. RavindranathanThampi, K. Ravindranathan

Graetzel, MichaelGraetzel, Michael

Kiwi, JohnKiwi, John

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Article abstract of DOI:10.1039/ft9908603671

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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