Abstract
From consideration of several examples of catalytic oxide systems, it appears that the mild oxidation of light alkanes to oxygenates is controlled by the local properties of the surface of oxides which favour the isolation of the active cation or of a controlled number of active sites. This appears to be quite general on massic mixed oxides as well as on supported oxides. Two examples are given for n-butane oxidation to maleic anhydride on the VPO catalyst and for ethane oxidation to acetic acid on the VPMoO/TiO2catalyst. This conclusion was reached by using several physicochemical techniques which are complementary and may distinguish the surface and the bulk properties of the catalytic oxides. As a consequence, the improvement of the performance of a catalytic oxide system and the discovery of new generation of catalysts will stem from the modification at short distance of the local environment of the active site.
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Volta, JC. Site isolation for light hydrocarbons oxidation. Topics in Catalysis 15, 121–129 (2001). https://doi.org/10.1023/A:1016645508285
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DOI: https://doi.org/10.1023/A:1016645508285