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Cooperation Between Phases in Mixed SnSbO Selective Oxidation Catalysts

Elsevier Science & Technology
DOI: 10.1016/s0167-2991(08)60214-1


A synergy is observed in the oxidation of isobutene to methacrolein when a Sn-rich SnSbO oxide calcined at high temperature is mechanically mixed with an Sb-rich SnSbO oxide calcined at the same temperature (or if mixed with pure Sb2O4). The catalysts were characterized by XRD, BET surface area measurements, Electron microscopy and XPS and it was found that i) the Sn-rich samples are either a pure Sb5+-SnO2 solid solution or a solid solution with a small quantity of segregated antimony oxide; ii) the Sb-rich samples contain α-Sb2O4 with a trace of solid solution and iii) mechanical mixtures are constituted of two separate phases: solid solution and α-Sb2O4. The observed synergy is explained by a remote control mechanism; α-Sb2O4 controls the number of active sites on the surface of Sb5+-SnO2 solid solution.

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