Innovative Process for the Synthesis of Vanadyl Pyrophosphate As a Highly Selective Catalyst for n-Butane Oxidation


Vanadyl pyrophosphate (VPO) catalysts are used for the selective oxidation of light alkanes, which are based on vanadyl hydrogen phosphate hemihydrate (VOHPO₄·0.5H₂O) as the precursor. Catalyst precursor with well-defined crystal size has been successfully synthesized for the first time, using a simple one-step high-pressure autoclave that was surfactant-free and water-free method with significantly lower temperature and shorter reaction time. VOHPO₄·0.5H₂O was prepared from V₂O5 using an isobutanol, 1-pentanol, 1-heptanol and 1-dectanol as both solvent and reducing agent at elevated temperatures (100, 120, and 150°C). This new method significantly reduced the preparation time and lowered production temperature (50%) of catalyst precursor (VOHPO₄·0.5H₂O) when compared to conventional hydrothermal synthesis methods. VOHPO₄·0.5H₂O can be obtained at temperature far below 150°C. It was found that the presence of 1-heptanol and 1-decanol in the reaction mixtures is crucial for obtaining a well-defined crystal size of precursor phase and solely generated impurity [VO(H₂PO₄)₂]. Our findings show that both the phase composition and morphology of vanadium phosphate can be influenced by the use of different reducing agents and temperatures during the preparation process. This new methodology produces catalysts with a much higher surface area (ca. 23m2g-1) compared with those materials prepared by slow hydrothermal synthesis (ca. 9.5m2g-1). Finally, the yield of maleic anhydride was significantly increased from 21.3% for conventional catalyst to 37.9% for the new solvothermal catalyst.


Chemical and Biochemical Engineering

Keywords and Phrases

High-Pressure Autoclave; n-Butane Oxidation; Solvothermal Synthesis; Vanadyl Hydrogen Phosphate Hemihydrate; Vanadyl Pyrophosphate; Butane; Catalysts; Crystal Impurities; Grain Size and Shape; Hydrogen; Maleic Anhydride; Oxidation; Pressure Vessels; Reducing Agents; Surface Active Agents; Vanadium; Vanadium Compounds; Hydrothermal Synthesis; Vanadyl Pyrophosphate Catalysts

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Article - Journal

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© 2010 Elsevier, All rights reserved.

Publication Date

01 Nov 2010