Glucose isomerization into fructose with CaO-MgO mixed oxides and dolomite(ore)-derived base CaO/MgO catalysts in water under mild conditions

文献类型： 外文期刊

第一作者： Long, Siyu

作者： Long, Siyu;Tang, Peiduo;Xian, Xuequan;Du, Fangli;Li, Yanming;Long, Siyu;Du, Qishi;Tang, Peiduo;Xian, Xuequan;Du, Fangli;Li, Yanming;Huang, Zhangbao

作者机构：

关键词： Dolomite; Calcination; Basicity; Glucose; Fructose; Isomerization

期刊名称：FUEL （ 影响因子：6.7； 五年影响因子：6.5 ）

ISSN： 0016-2361

年卷期： 2024 年 370 卷

页码：

收录情况： SCI

摘要： Isomerization of glucose into fructose represents a crucial intermediate step in bio-refining because fructose serve as a more effective substrate than glucose for converting cellulosic biomass into biofuels and fine chemicals. In this study, we demonstrated the effectiveness of a solid base catalyst derived from natural dolomite through simple calcination, which is easily prepared, cost-effective, and recyclable. We investigated a series of prepared CaO/MgO catalysts with varied compositions, morphologies, textures and basicity. The optimal catalyst, prepared by calcination at 650 degrees C for 3 hours followed by 700 degrees C for 3 hours, achieved a glucose conversion of 42.3 %, a fructose yield of 35.9 %, and a fructose selectivity of 84.8 % at 35 degrees C for 60 min. For comparison, we also investigated CaO-MgO mixed oxides with varying molar contents of CaO for glucose isomerization. A multivariable linear regression model was applied to determine the optimal reaction conditions. The validated optimal conditions fell within the ranges of 6-9 mol% CaO content, 35-55 degrees C and 20-60 min. Under these conditions, a superior fructose yield of 35.6 % and a fructose selectivity of 76.1 % were achieved using a catalyst of 8 mol% CaO at 55 degrees C for 45 min. The basicity of catalyst, which has been shown to positively correlated with the CaO content in CaO-MgO mixed oxides and the degree of partial decomposition of dolomite (degree of calcination) during catalyst preparation, plays a significant role in catalytic performance. Moderate basicity is conducive to glucose conversion to fructose, whereas excessive basicity can lead to the formation of byproducts, thereby reducing fructose selectivity. Furthermore, both types of catalyst were confirmed to be reusable for at least three cycles. This study introduces a novel approach for utilizing nature dolomites and enhances the understanding of fructose production from glucose using solid base catalysts.

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