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首页> 外文期刊>Catalysis science & technology >Superior performance of mesoporous tin oxide over nano and bulk forms in the activation of a carbonyl group: conversion of bio-renewable feedstock
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Superior performance of mesoporous tin oxide over nano and bulk forms in the activation of a carbonyl group: conversion of bio-renewable feedstock

机译:性能优越的介孔二氧化锡纳米和散装形式的激活羰基:bio-renewable转换原料

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摘要

The efficiency of mesoporous tin oxide as an acid catalyst in the activation of a carbonyl group through selected organic transformations involving the conversion of biomass derived molecules to value-added chemicals is reported. The mesoporous tin oxide was synthesized under ambient temperature using CTAB and was characterized by XRD, FT-IR, SEM, TEM, TGA, N-2 sorption, TPD-NH3 and py-FT-IR. It was calcined at different temperatures, showing different physico-chemical properties, and exhibited a wormhole like topology with a large surface area of 160 m(2) g(-1). The py-FT-IR acidity measurement of the mesoporous tin oxide showed the presence of Bronsted and Lewis acid sites. These acid sites were sufficient to activate the carbonyl group of an aldehyde, a ketone, an acetic anhydride and an amide in selected important organic transformations such as Prins condensation, glycerol carbonylation with urea, ketalization of glycerol with cyclohexanone and acetylation of glycerol with acetic anhydride. In all the above catalytic processes, the mesoporous tin oxide showed superior performance compared to nano and bulk tin oxides. The mesoporous tin oxide catalyst also showed excellent recyclability and remarkable activity compared to the reported catalysts in all the reactions under study.
机译:介孔氧化锡作为酸的效率催化剂的活化羰基通过选择有机转换涉及生物质衍生的转换分子增值化学品报告。合成的介孔二氧化锡用CTAB,环境温度以XRD、ir、SEM、TEM、TGA、n - 2吸附,TPD-NH3 py-FT-IR。在不同的温度下,显示不同理化性能,表现出一个虫洞喜欢和大表面积拓扑160 g(1)(2)。介孔二氧化锡的测量显示他们分别和路易斯酸网站的存在。这些酸网站能充分激活羰基的醛、酮乙酸酐和酰胺选中重要的有机转换如王子缩合、甘油和尿素羰基化,ketalization甘油与环己酮甘油和乙酸酐乙酰化作用。所有上面的催化过程,介孔氧化锡显示相比性能优越纳米和批量锡氧化物。氧化催化剂也表现出优秀的再循环能力和非凡的活动相比报道的催化剂下反应研究。

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