Superacid ZrO2–SiO2–SnO2 Mixed Oxide: Synthesis and Study

: pp. 336–342
Institute of Sorption and Problems of Endoecology of the NAS of Ukraine, Kyiv, Ukraine
Institute of Sorption and Problems of Endoecology of the NAS of Ukraine, Kyiv, Ukraine
Technical Center of the NAS of Ukraine, Kyiv, Ukraine
Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Kyiv, Ukraine
Institute of Sorption and Problems of Endoecology of the NAS of Ukraine, Kyiv, Ukraine

Superacid ternary ZrO2 SiO2 SnO2 oxide has been synthesized by the sol-gel method with a different atomic ratio Zr:Si:Sn. The highest strength of acid sites has been observed in the ranges of 20 ≤ Zr4+ ≤ 29, 60 ≤ Si4+ ≤ 67, 11 ≤ Sn4+ ≤ 20 at.%. According to the XPS spectra and 119Sn, 29Si MAS NMR spectra of ZrO2 SiO2 SnO2 a partial shift of electron density from zirconium to silicon ions was observed resulting in the formation of superacid Lewis sites. It was shown that superacid Zr29Si60Sn11 mixed oxide efficiently catalyzes acylation of toluene with acetic anhydride at 423 K in a flow reactor with 45% conversion of anhydride at 100% selectivity towards p-methylacetophenone.

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