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首页> 外文期刊>Comptes Rendus Chimie >Preparation and characterisation of amorphous mesoporous aluminophosphate and metal aluminophosphate as an efficient heterogeneous catalyst for transesterification reaction
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Preparation and characterisation of amorphous mesoporous aluminophosphate and metal aluminophosphate as an efficient heterogeneous catalyst for transesterification reaction

机译：非晶态介孔铝磷酸盐和金属铝磷酸盐作为酯交换反应的高效多相催化剂的制备与表征

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摘要

Preparation, characterisation of pure aluminophosphate and aluminophosphate modified with different transition metals (V, Fe, Co Ni & Cu) and their catalytic activity in mono/ dibenzyl substituted malonates synthesis are explained. The materials were prepared by the coprecipitation method in the absence of any structure-directing species and characterized for their composition, crystalline nature, total surface acidity, specific surface area pore diameter and pore volume by different techniques. Catalytic activity of the materials was investigated in transesterification of diethylmalonate with benzyl alcohol in liquid phase. Pure aluminophosphate resulted only in benzyl ethylmalonate whereas the incorporation of transition metals favored the formation of both benzyl ethylmalonate and dibenzylmalonate. Catalytic activity parallels the surface acidity and mesoporosity of the catalysts. The effect of the molar ratio of reactants, amount of catalyst, and reaction time on the conversion of diethyl malonate and transester yield has been studied. The highest activity of iron aluminophosphate is attributed to its mesoporous nature with uniform pore size distribution, higher surface acidity and surface area. Further, the scope and generality of iron aluminophosphate as a catalyst in the transesterification was studied using various aliphatic, alicyclic and aromatic alcohols. The catalysts could be recycled by retaining most of its initial activity.
机译：解释了纯铝磷酸盐和用不同过渡金属（V，Fe，Co Ni和Cu改性）改性的铝磷酸盐的制备，表征以及它们在单/二苄基取代的丙二酸酯合成中的催化活性。该材料是在没有任何结构导向物质的情况下通过共沉淀法制备的，并通过不同技术对其组成，结晶性质，总表面酸度，比表面积孔径和孔体积进行了表征。在丙二酸二乙酯与苯甲醇在液相中进行酯交换反应中研究了该材料的催化活性。纯铝磷酸盐仅产生丙二酸乙基乙酯，而过渡金属的引入有利于丙二酸乙基乙酯和丙二酸二苄酯的形成。催化活性与催化剂的表面酸度和中孔性平行。研究了反应物的摩尔比，催化剂的量和反应时间对丙二酸二乙酯转化率和酯交换率的影响。铝磷酸铁的最高活性归因于其介孔性质，均匀的孔径分布，较高的表面酸度和表面积。此外，使用各种脂族，脂环族和芳族醇研究了磷酸铝铁在酯交换反应中作为催化剂的范围和通用性。可以通过保留大部分初始活性来回收催化剂。

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