MgO-ZrO2 Mixed Oxides as Effective and Reusable Base Catalysts for Glucose Isomerization into Fructose in Aqueous Media.,Chemistry - An Asian Journal

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MgO-ZrO2 Mixed Oxides as Effective and Reusable Base Catalysts for Glucose Isomerization into Fructose in Aqueous Media.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2019-12-18 , DOI: 10.1002/asia.201901534
Abdallah I M Rabee _{1,

2} , Son Dinh Le ₁ , Shun Nishimura ₁

Affiliation

MgO-ZrO2 mixed oxides prepared with different Mg/Zr atomic ratios (denoted as xMZ: where x is the atomic ratio of Mg/Zr) are investigated for the glucose isomerization to fructose in water at 95 °C. The highest fructose yield of 33 % is obtained over 0.76MZ with ≈74 % selectivity after 3 h. To gain insight into the structure-activity relationships, the prepared catalysts are characterized by N2 physisorption, XRD, FTIR and CO2 -TPD. The results indicate that the addition of MgO drastically changed the textual property of ZrO2 and increased the number of basic sites. The kinetic studies revealed that the Lewis basic sites (cus-O2- ) generated from the highly dispersed MgO are the active sites responsible for the enhanced isomerization activity. Notably, MZ is reusable for four runs without a significant decrease in catalyst activity. Accordingly, this study provides an easily prepared, cheap, and recyclable catalyst that may hold great potential for fructose production.

中文翻译：

MgO-ZrO2混合氧化物是在水性介质中将葡萄糖异构化为果糖的有效且可重复使用的碱催化剂。

研究了在95°C水中葡萄糖异构化为果糖的过程，研究了以不同Mg / Zr原子比（表示为xMZ：其中x是Mg / Zr的原子比）制备的MgO-ZrO2混合氧化物。在3小时后，在0.76MZ上以≈74％的选择性获得了33％的最高果糖产率。为了深入了解结构-活性关系，制备的催化剂通过N2物理吸附，XRD，FTIR和CO2-TPD进行表征。结果表明，MgO的添加极大地改变了ZrO2的文本性质，并增加了碱性位点的数量。动力学研究表明，由高度分散的MgO生成的Lewis碱性位点（cus-O2-）是负责增强异构化活性的活性位点。值得注意的是，MZ可重复使用四次，而催化剂活性没有明显降低。因此，

更新日期：2019-12-19

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