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Green Synthesis of Furfural Acetone by Solvent-Free Aldol Condensation of Furfural with Acetone over La2O3–MgO Mixed Oxide Catalyst
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-08-26 , DOI: 10.1021/acs.iecr.9b01138
Deepak S. Desai 1 , Ganapati D. Yadav 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-08-26 , DOI: 10.1021/acs.iecr.9b01138
Deepak S. Desai 1 , Ganapati D. Yadav 1
Affiliation
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Conversion of biomass, whether fresh or waste, into valuable chemicals and intermediates will be very useful to reduce dependence on fossil feedstock. Furfural is a biomass-derived chemical which can be valorized. Furfural acetone (FAc) is used as an intermediate in fine chemical industries and produced by using polluting homogeneous basic catalysts. In the current study, La–Mg mixed oxide (MO) catalysts with various mole ratios were prepared by hydrothermal (H) and combustion (C) methods for the preparation of FAc. It was found that moderate to strong basicity of the La1Mg3MO-H catalyst prepared by the hydrothermal method vis-à-vis La1Mg3MO-C helps to attain a highly selective cross-aldol condensation reaction of furfural with acetone. In the current reaction process, high conversion of furfural (96%) and high selectivity of FAc (98%) were achieved after 7 h of reaction time. The catalyst was well characterized by various analytical orthogonal techniques such as FTIR, DCS-TGA, SEM-EDX, BET, TPD, and XRD. A solvent-free reaction engineering approach was adopted to eliminate the undesired byproducts, and also, the use of hazardous solvents was avoided. A kinetic model based on the proposed reaction mechanism was developed, which follows the LHHW mechanism with weak adsorption of all species. The activation energy of the cross-aldol condensation of furfural with acetone was found to be 12.11 kcal/mol.
中文翻译：
La2O3–MgO混合氧化物催化剂上糠醛与丙酮的无溶剂醛醇缩合缩醛绿色合成糠醛丙酮
将生物质（无论是新鲜的还是废物的）转化为有价值的化学品和中间体，对于减少对化石原料的依赖将非常有用。糠醛是一种生物质衍生的化学品，可以被估价。糠醛丙酮（FAc）在精细化工行业中用作中间体，并使用污染均相的碱性催化剂生产。在当前的研究中，通过水热法（H）和燃烧法（C）制备具有不同摩尔比的La-Mg混合氧化物（MO）催化剂，以制备FAc。发现通过水热法制备的La 1 Mg 3 MO-H催化剂相对于La 1 Mg 3具有中等至强碱性。MO-C有助于实现糠醛与丙酮的高度选择性的交叉羟醛缩合反应。在当前的反应过程中，反应7小时后，糠醛的转化率较高（96％），FAc的选择性较高（98％）。通过多种分析正交技术如FTIR，DCS-TGA，SEM-EDX，BET，TPD和XRD对催化剂进行了很好的表征。采用了无溶剂反应工程方法来消除不希望的副产物，并且避免了使用有害溶剂。建立了基于所提出的反应机理的动力学模型，该动力学模型遵循LHHW机理，所有种类的吸附均较弱。发现糠醛与丙酮的交叉羟醛缩合的活化能为12.11kcal / mol。
更新日期：2019-08-26
中文翻译：
La2O3–MgO混合氧化物催化剂上糠醛与丙酮的无溶剂醛醇缩合缩醛绿色合成糠醛丙酮
将生物质（无论是新鲜的还是废物的）转化为有价值的化学品和中间体，对于减少对化石原料的依赖将非常有用。糠醛是一种生物质衍生的化学品，可以被估价。糠醛丙酮（FAc）在精细化工行业中用作中间体，并使用污染均相的碱性催化剂生产。在当前的研究中，通过水热法（H）和燃烧法（C）制备具有不同摩尔比的La-Mg混合氧化物（MO）催化剂，以制备FAc。发现通过水热法制备的La 1 Mg 3 MO-H催化剂相对于La 1 Mg 3具有中等至强碱性。MO-C有助于实现糠醛与丙酮的高度选择性的交叉羟醛缩合反应。在当前的反应过程中，反应7小时后，糠醛的转化率较高（96％），FAc的选择性较高（98％）。通过多种分析正交技术如FTIR，DCS-TGA，SEM-EDX，BET，TPD和XRD对催化剂进行了很好的表征。采用了无溶剂反应工程方法来消除不希望的副产物，并且避免了使用有害溶剂。建立了基于所提出的反应机理的动力学模型，该动力学模型遵循LHHW机理，所有种类的吸附均较弱。发现糠醛与丙酮的交叉羟醛缩合的活化能为12.11kcal / mol。
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