Abstract A series of composites of phosphotungstic acid (PWA) H3PW12O40 with SBA-15 were prepared by varying PWA amount from 5% to 30% by one-step sol-gel hydrothermal as well as by impregnation methods. Successful incorporation of PWA into the SBA-15 framework by sol-gel method was confirmed by 31P NMR in which a shifting of the peak due to tetrahedral ‘P’ atom of PWA from −14.32 and −14.49 ppm was observed. The composites exhibited both Bronsted and Lewis acidity, large and well distributed three dimensional interconnected pores with high surface areas exhibiting excellent activity for one pot synthesis of 5-(hydroxymethyl) furfural (5-HMF) and 5-(ethoxymethyl) furfural (EMF) from fructose. The minimum loading of 5% of PWA in SBA-15, gave 78% fructose conversion with the highest yield of 70% towards 5-HMF. Increase in PWA loading up to 20% resulted in the enhanced fructose conversion of 95% accompanied by further etherification of 5-HMF to 67 and 12% yield towards EMF and ethyl levulinate (EL), respectively. Increasing the % of PWA in SBA-15 matrix resulted in increase in the acidity of the composites giving the yield trend as 5-HMF

中文翻译：

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PWA/SBA-15催化剂上果糖合成柴油添加剂

摘要 通过一步溶胶-凝胶水热法和浸渍法，将磷钨酸(PWA) H3PW12O40 与SBA-15 的用量从5% 到30% 不等，制备了一系列磷钨酸(PWA) H3PW12O40 复合材料。31P NMR 证实了通过溶胶-凝胶方法将 PWA 成功掺入 SBA-15 框架中，其中观察到由于 PWA 的四面体“P”原子而导致的峰从 -14.32 和 -14.49 ppm 的位移。复合材料表现出布朗斯台德和路易斯酸度，大且分布良好的三维互连孔具有高表面积，对 5-（羟甲基）糠醛（5-HMF）和 5-（乙氧基甲基）糠醛（EMF）的一锅合成具有优异的活性从果糖。SBA-15 中 5% 的 PWA 的最小负载量产生 78% 的果糖转化率，最高的 5-HMF 产率为 70%。PWA 负载增加至 20% 导致 95% 的果糖转化率提高，同时 5-HMF 进一步醚化至 EMF 和乙酰丙酸乙酯 (EL) 的收率分别为 67% 和 12%。增加 SBA-15 基体中 PWA 的百分比导致复合材料的酸度增加，产生 5-HMF 的产量趋势