Lanthanum oxycarbonate modified Cu/Al2O3 catalysts for selective hydrogenolysis of glucose to propylene glycol: base site requirements,Catalysis Science & Technology

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Lanthanum oxycarbonate modified Cu/Al2O3 catalysts for selective hydrogenolysis of glucose to propylene glycol: base site requirements
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-08-30 00:00:00 , DOI: 10.1039/c7cy01571b
P. Yazdani _{1,

2,

3,

4,

5} , B. Wang _{1,

2,

3,

4} , Y. Du _{1,

2,

3,

4} , S. Kawi _{4,

5,

6} , A. Borgna _{1,

2,

3,

4,

5}

Affiliation

This work reports on the base properties of La₂O₂CO₃–Cu/Al₂O₃ catalysts and their effect on the catalyst's performance in the aqueous hydrogenolysis of glucose to propylene glycol. The catalysts show promising performance in glucose isomerisation, C–C bond cleavage of fructose and hydrogenation of the resulting fragments. The base properties of the catalyst influence the selectivity. More specifically, the basicity of the catalyst facilitates the isomerisation of glucose to fructose and the C–C bond cleavage of fructose to produce lighter products. This is evidenced by the correlation between the acid–base properties of the catalysts and their catalytic performance. In contrast, acid sites promote side reactions such as condensation reactions. Based on this study, a surface reaction mechanism is proposed for the first step of the tandem reactions, the isomerisation of glucose to fructose. The effect of the reaction time and temperature on the product distribution was investigated to get more insight into the reaction pathways. In this regard, the conversion of intermediates was also investigated. Then, a reaction mechanism was proposed based on the findings of this study and previous works.

中文翻译：

碳酸氧镧改性的Cu / Al ₂ O ₃催化剂，用于葡萄糖选择性加氢水解成丙二醇：基本要求

这项工作报告了La ₂ O ₂ CO ₃ –Cu / Al ₂ O ₃的基本性质催化剂及其对葡萄糖在氢加氢制丙二醇中的性能的影响。催化剂在葡萄糖异构化，果糖的C–C键裂解和所得片段的氢化中显示出令人鼓舞的性能。催化剂的基本性质影响选择性。更具体地说，催化剂的碱度有助于葡萄糖异构化为果糖，并促进果糖的C-C键裂解，从而产生较轻的产物。催化剂的酸碱性质与其催化性能之间的相关性证明了这一点。相反，酸位促进了副反应，例如缩合反应。基于这项研究，提出了串联反应第一步的表面反应机理，即葡萄糖异构化为果糖。研究了反应时间和温度对产物分布的影响，以更深入地了解反应途径。在这方面，还研究了中间体的转化。然后，根据本研究的发现和以前的工作提出了一种反应机理。

更新日期：2017-09-20

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