S. Prudius, N. Hes, Volodymyr Trachevskiy, O. Khyzhun, V. Brei
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引用次数: 4
摘要
采用溶胶-凝胶法制备了不同原子比Zr:Si:Sn的超强酸三元ZrO2 SiO2 SnO2氧化物。在20≤Zr4+≤29,60≤Si4+≤67,11≤Sn4+≤20at %的范围内观察到酸位的最高强度。根据ZrO2 SiO2 SnO2的XPS谱和119Sn, 29Si MAS NMR谱，观察到电子密度从锆离子到硅离子的部分转移导致了超酸性路易斯位的形成。结果表明，超强酸Zr29Si60Sn11混合氧化物在423 K的流动反应器中，以45%的酸酐转化率和100%的选择性，有效地催化甲苯与乙酸酐的酰化反应。
Superacid ZrO2–SiO2–SnO2 Mixed Oxide: Synthesis and Study
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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