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 5H(2)O) 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 5H(2)O 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 5H(2)O) when compared to conventional hydrothermal synthesis methods VOHPO4 0 5H(2)O 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 23 m(2) g(-1)) compared with those materials prepared by slow hydrothermal synthesis (ca 9 5 m(2) g(-1)) Finally the yield of maleic anhydride was significantly increased from 21 3% for conventional catalyst to 37 9% for the new solvothermal catalyst Crown Copyright (C) 2010 Published by Elsevier BV All rights reserved