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A new preparative route for vanadium phosphate catalysts is described using supercritical CO 2 as an antisolvent. The amorphous microspheroidal VPO produced is shown to be more active than comparable crystalline VPO catalysts for the selective oxidation of n-butane to maleic anhydride and, furthermore, does not require an extensive pretreatment or activation period to establish full catalytic...
Crystalline vanadium phosphate catalysts (VPO) are the only example of a commercial heterogeneous partial oxidation catalyst for the activation of alkanes. The origin of activity is generally accepted as being associated with the crystallinity of the compounds. Here we describe a new preparative route to VPO using antisolvent precipitation with supercritical CO 2 to generate amorphous microspheroidal...
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