Effects of Redox of Cu-Species in Copper-Strontium Hydroxyapatites on the Oxidative Dehydrogenation of Propane

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Although it is generally accepted that the catalytic activities of hydroxyapatites for the oxidative dehydrogenation of propane decrease upon addition of CCl₄ into the feedstream, greater and stable activities have been found with copper-strontium hydroxyapatites (Cu-SrHAp) in the presence of CCl₄. X-ray diffraction and X-ray absorption fine structure analyses of the catalysts used for the oxidation in the presence and absence of CCl₄ demonstrate that deep reduction of Cu²⁺ to Cu⁰ of Cu-species in Cu-SrHAp during the oxidation is suppressed by the introduction of CCl₄, resulting in an enhancement of the activities of the catalysts in the presence of CCl₄.