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首页> 外文期刊>Catalysis science & technology >Sequential dehydration of sorbitol to isosorbide over acidified niobium oxides
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Sequential dehydration of sorbitol to isosorbide over acidified niobium oxides

机译：连续脱水山梨糖醇异山梨醇在酸化铌氧化物

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摘要

Isosorbide is a bio-based functional diol, which is prepared by sequential dehydration of sorbitol and widely used in plasticizers, monomers, solvents or pharmaceuticals. In this study, a variety of acidified Nb2O5 catalysts were prepared and used for the sequential dehydration of sorbitol to isosorbide. Acidification can effectively regulate the surface acidity of catalysts, which was measured by pyridine infrared spectroscopy and NH3-TPD analysis. The catalytic performance was related to the surface acidity, including the reaction temperature and the amount of catalysts. After optimization of reaction conditions, the yield of isosorbide reached 84.1% with complete sorbitol conversion during reaction at 150 degrees C for 3 h over 2 M sulfuric acid modified Nb2O5. Finally, the reaction mechanism regarding the role of Lewis acid sites was discussed. This study is of great significance for further development of an efficient catalytic system for the dehydration of carbohydrates to isosorbide.
机译：异山梨醇是一种生物功能二醇是由连续脱水山梨糖醇吗和广泛使用的增塑剂,单体,溶剂或药品。各种各样的酸化Nb2O5催化剂准备用于连续脱水山梨糖醇异山梨醇。有效地调节的表面酸性催化剂,以吡啶红外光谱和NH3-TPD分析。催化性能与表面温度和酸度,包括反应催化剂的量。反应条件下,异山梨醇的收益率与完整的山梨糖醇转化率达到84.1%在150摄氏度反应3 h / 2 M硫酸Nb2O5修改。反应机理对刘易斯的角色酸的网站进行了讨论。意义的进一步发展高效的催化体系的脱水碳水化合物异山梨醇。

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