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Surface properties and catalytic activity of a Mo-fixed catalyst. Structure of the active site and mechanism for selective oxidation of ethyl alcohol
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1978
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EngineeringChemistryCatalyst ActivationChemical EngineeringPhotocatalysisInterfacial ChemistryMaterials ScienceInorganic ChemistrySelective OxidationPhotochemistryActive SiteCatalysisCatalytic ProcessMo-fixed CatalystNatural SciencesHeterogeneous CatalysisFixed CatalystSingle-atom CatalystCatalyst PreparationEthyl Alcohol
The physico-chemical properties of the surface of a Mo-fixed catalyst obtained by a ready reaction between Mo(π-C3H5)4 and surface OH groups of SiO2 were investigated by X-ray photoelectron spectroscopy, photoluminescence technique, u.v. diffuse reflectance spectroscopy, i.r. spectrometry and H2/O2 uptake. The difference between the surface properties of the fixed catalyst and the conventional impregnation catalyst is discussed. The Mo-fixed catalyst showed higher activity and selectivity than the conventional impregnation catalyst in the ethyl alcohol oxidation. Selective oxidation to form acetaldehyde proceeded by a two-stage redox (Mo6+⇌ Mo4+) mechanism. Coordinatively unsaturated dioxomolybdenum of uniform nature in a tetrahedral coordination is the active species in the selective oxidation of ethyl alcohol.