Utilizing imogolite nanotubes as a tunable catalytic material for the selective isomerization of glucose to fructose
Utilizing imogolite nanotubes as a tunable catalytic material for the selective isomerization of glucose to fructose
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DOI：
10.1016/j.cattod.2018.07.059
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发表时间：
2019-02
期刊：
影响因子：
5.3
通讯作者：
Nathaniel S. Olson;N. Deshpande;S. Gunduz;U. Ozkan;N. Brunelli
中科院分区：
文献类型：
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作者：
Nathaniel S. Olson;N. Deshpande;S. Gunduz;U. Ozkan;N. Brunelli
葡萄糖异构化为果糖是将生物质转化为有价值的燃料和化学品的重要步骤。异构化反应的一个关键挑战是使用可回收和廉价的催化剂实现对果糖的高选择性。本研究以伊毛沸石纳米管为催化剂，研究了葡萄糖异构化为果糖的反应。Imogolite是单壁铝硅酸盐纳米管，其特征在于200-400 m2/g的表面积和接近1 nm的孔宽度。Imogolite是一种高度可调的结构，可以通过用Ge取代Si或通过将甲基官能化到内表面来改性。这些改性改变了纳米管的表面性质，并能够调节催化性能。Imogolite纳米管被成功地用作葡萄糖异构化为果糖的非均相催化剂。在测试的组合物中，铝硅酸盐伊毛沸石是葡萄糖转化最活跃的材料，葡萄糖转化率为30%，果糖选择性为45%。催化剂再循环实验表明，有机物在纳米管上积累，导致转化率轻微降低，同时保持类似的催化选择性。可以用氨水洗涤催化剂，从而恢复果糖的生产率。总体而言，伊毛戈兰纳米管是一种活性且可调的催化平台，对葡萄糖异构化为果糖具有中等选择性。
The isomerization of glucose to fructose is an important step in the conversion of biomass to valuable fuels and chemicals. A key challenge for the isomerization reaction is achieving high selectivity towards fructose using recyclable and inexpensive catalysts. In this study, the isomerization of glucose to fructose is investigated through using imogolite nanotubes as a catalyst. Imogolite is a single-walled aluminosilicate nanotube characterized by surface areas of 200-400 m2/g and pore widths near 1 nm. Imogolite is a highly tunable structure and can be modified through substitution of Si with Ge or through functionalization of methyl groups to the inner surface. These modifications change the surface properties of the nanotubes and enable tuning of the catalytic performance. Imogolite nanotubes are successfully used as a heterogeneous catalyst for the isomerization of glucose to fructose. Of the compositions tested, aluminosilicate imogolite is the most active material for the conversion of glucose, achieving a glucose conversion of 30% and a fructose selectivity of 45%. Catalyst recycling experiments reveals that organic content accumulates on the nanotubes that results in a minor reduction in conversion while maintaining similar catalytic selectivity. The catalyst can be washed with aqueous ammonia, allowing the productivity of fructose to be recovered. Overall, imogolite nanotubes are an active and tunable catalytic platform with moderate selectivity for the isomerization of glucose to fructose.