A Periodic DFT Study of Glucose to Fructose Isomerization on Tungstite (WO3·H2O): Influence of Group IV–VI Dopants and Cooperativity with Hydroxyl Groups

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• 作者：Guanna Li ; Evgeny A. Pidko ; Emiel J. M. Hensen
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：July 1, 2016
• 年：2016
• 卷：6
• 期：7
• 页码：4162-4169
• 全文大小：524K
• 年卷期：0
• ISSN：2155-5435

文摘

Periodic density functional theory (DFT) calculations were carried out to investigate the mechanism of glucose to fructose isomerization over tungstite (WO₃·H₂O). The isomerization reaction is catalyzed by undercoordinated W⁶⁺ sites. The reaction mechanism proceeds through an H-shift from C2 to C1 and involves a cooperative action of Lewis acidic tungsten sites with neighboring proton donors, which form a hydrogen-bonding surface network. Dopants of group IV–VI transition metals stabilize the preactivated complex, which is the deprotonated open form of glucose adsorbed to the surface. In particular, calculations reveal that doping the tungstite structure with Nb⁵⁺ and Ti⁴⁺ ions is effective in lowering the overall barrier for glucose isomerization.