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首页> 外文期刊>Catalysis science & technology >Conversion of dihydroxyacetone to methyl lactate catalyzed by highly active hierarchical Sn-USY at room temperature
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Conversion of dihydroxyacetone to methyl lactate catalyzed by highly active hierarchical Sn-USY at room temperature

机译：二羟基丙酮转换成甲基乳酸高度活跃的分层Sn-USY催化的室温

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摘要

Hierarchical Sn-USY zeolites were prepared by the post-synthesis method via dealumination of H-USY zeolite with nitric acid and solid-state ion-exchange with SnCl4. High concentration of nitric acid was favorable for removal of framework Al and the following Sn incorporation. The physicochemical properties of Sn-USY zeolites were characterized by various techniques. Sn was incorporated into the framework site which created Lewis acid sites. Meanwhile, the abundant mesopores generated by acid treatment were preserved after Sn incorporation. The prepared hierarchical Sn-USY zeolites were used to catalyze the conversion of 1,3-dihydroxyacetone (DHA) to methyl lactate (MLA) in methanol. It is found that the hierarchical Sn-USY zeolites are highly active and selective for this reaction. At ambient temperature (25-40 degrees C), DHA was completely transformed with more than 95% MLA yield. Moreover, the hierarchical Sn-USY zeolites are recyclable and reusable at least five times without significant loss of activity and selectivity.
机译：分层Sn-USY沸石是准备的通过dealumination H-USY post-synthesis方法沸石与硝酸和固态与SnCl4离子交换。硝酸是有利于去除框架和艾尔以下Sn公司。Sn-USY沸石的物理化学性质在各种技术的特征。纳入框架网站路易斯酸网站创建。中孔产生的酸处理Sn公司后保存。分层Sn-USY沸石被用来催化转换1,3-dihydroxyacetone(DHA)在甲醇甲基乳酸(MLA)。发现分层Sn-USY沸石高活性和选择性反应。环境温度(批准摄氏度),DHA完全改变了MLA超过95%产量。可回收和可重用的至少5次吗没有重大的活动和损失选择性。

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