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Selective Oxidation of Methanol to Formaldehyde Over Active Molybdenum Oxide Supported on Hydroxyapatite Catalysts

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Abstract

Hydroxyapatite (HAP) was synthesized by sol–gel method. Different ratios of molybdenum oxide (1–15 % w/w) supported on HAP were prepared by the impregnation method and calcined at 400 °C in a static air atmosphere. The catalysts were characterized by thermogravimetry, differential thermal analysis, X-ray diffraction, FTIR spectroscopy and nitrogen sorption measurements. The surface acidity of the catalysts was investigated by the dehydration of isopropyl alcohol and the adsorption of pyridine (PY) and 2,6-dimethyl pyridine (DMPY). The gas–phase oxidation of methanol to formaldehyde was carried out in a conventional fixed-bed flow type reactor using N2 as a carrier gas. The obtained results clearly revealed that HAP–MoO3 systems were active and selective towards the formation of formaldehyde. The maximum yield of formaldehyde (97 %) was achieved on the catalyst containing 5 wt% MoO3/HAP. The generation of Mo6+as Lewis together with Brønsted acid sites play the main role in the formation of formaldehyde.

Graphical Abstract

Catalytic oxidation of methanol over MoO3/HAP calcined at 400 °C for 4 h.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt

    Abd El-Aziz A. Said, Mohamed M. M. Abd El-Wahab & Alian M. Alian

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  1. Abd El-Aziz A. Said
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  2. Mohamed M. M. Abd El-Wahab
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  3. Alian M. Alian
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Correspondence to Abd El-Aziz A. Said.

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Said, A.EA.A., El-Wahab, M.M.M.A. & Alian, A.M. Selective Oxidation of Methanol to Formaldehyde Over Active Molybdenum Oxide Supported on Hydroxyapatite Catalysts. Catal Lett 146, 82–90 (2016). https://doi.org/10.1007/s10562-015-1624-2

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