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首页> 外文期刊>Catalysis science & technology >Synthesis of a H-Sulfo-POSS catalyst and application in the acetalization of glycerol with 2-butanone to yield a biofuel additive
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Synthesis of a H-Sulfo-POSS catalyst and application in the acetalization of glycerol with 2-butanone to yield a biofuel additive

机译：H-Sulfo-POSS催化剂和合成在甘油的acetalization中的应用2-butanone产生生物燃料添加剂

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摘要

Nanosized polyhedral oligomeric silsesquioxanes (POSS) have been employed as molecular weight enlarged structures for different purposes owing to their ease of synthesis and modification. In this work, the commercially available compound octaphenyl-POSS has been modified with chlorosulfonic acid to obtain multifunctional acidic materials (H-Sulfo-POSS) with different degrees of functionality in the structure. The synthesized materials have been characterized by ion exchange capacity, degree of sulfonation, H-1-NMR, ATR-IR spectroscopy and SEM. These H-Sulfo-POSS nanocomposites were then applied to the acetalization of glycerol with 2-butanone to yield the corresponding ketal, which is a product of interest as an oxygenate fuel additive. The catalytic activity in dynamic experiments of the H-Sulfo-POSS (2601 h(-1)) material with the highest degree of sulfonation was even higher than that shown by the molecular catalyst para-toluene sulfonic acid (PTSA) (2256 h(-1)) and better than Amberlyst 36 (213 h(-1)); however, upon recycling by centrifugation of the catalyst, the activity of this material was not very stable. On the other hand, the material with the lowest degree of sulfonation showed not only higher activity than Amberlyst 36, but also very stable activity after reutilization throughout 10 runs.
机译：纳米尺度的多面体低聚物的silsesquioxanes(彼得)曾作为分子量由于放大结构为不同的目的他们易于合成和改性。这工作,商用复合octaphenyl-POSS已被修改氯磺酸获得多功能酸性物质(H-Sulfo-POSS)不同度的功能结构。合成材料的特征离子交换容量、磺化度,H-1-NMR ATR-IR光谱和扫描电镜。H-Sulfo-POSS纳米复合材料被应用到甘油的acetalization 2-butanone产生相应的缩酮,这是一个产品感兴趣的充氧燃料添加剂。催化活性的动态实验H-Sulfo-POSS (2601 h(1))的材料最高的磺化度甚至更高比分子所示的催化剂对甲苯磺酸(PTSA) (2256 h (1))和比Amberlyst 36 h (1) (213);然而,在回收的离心分离催化剂,这种材料没有的活动非常稳定。磺化度显示不仅最低活动高于Amberlyst 36,但也很稳定的活动后重复利用在10运行。

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