On the Effect of the M3+ Origin on the Properties and Aldol Condensation Performance of MgM3+ Hydrotalcites and Mixed Oxides

水滑石 羟醛缩合 糠醛 物理吸附 催化作用 冷凝 化学 丙酮 结晶度 傅里叶变换红外光谱 基础(拓扑) 作文(语言) 羟醛反应 化学工程 有机化学 热力学 结晶学 数学 物理 工程类 数学分析 哲学 语言学
作者
Valeriia Korolova,Oleg Kikhtyanin,Martin Veselý,Dan Vrtiška,Iva Paterová,Vlastimil Fíla,Libor Čapek,David Kubička
出处
期刊:Catalysts [Multidisciplinary Digital Publishing Institute]
卷期号:11 (8): 992-992 被引量:8
标识
DOI:10.3390/catal11080992
摘要

Hydrotalcites (HTCs) are promising solid base catalysts to produce advanced biofuels by aldol condensation. Their main potential lies in the tunability of their acid-base properties by varying their composition. However, the relationship between the composition of hydrotalcites, their basicity, and their catalytic performance has not yet been fully revealed. Here, we investigate systematically the preparation of HTCs with the general formula of Mg6M3+2(OH)16CO3·4H2O, where M3+ stands for Al, Ga, Fe, and In, while keeping the Mg/M3+ equal to 3. We use an array of analytical methods including XRD, N2 physisorption, CO2-TPD, TGA-MS, FTIR-ATR, and SEM to assess changes in the properties and concluded that the nature of M3+ affected the HTC crystallinity. We show that the basicity of the HTC-derived mixed oxides decreased with the increase in atomic weight of M3+, which was reflected by decreased furfural conversion in its aldol condensation with acetone. We demonstrate that all MgM3+ mixed oxides can be fully rehydrated, which boosted their activity in aldol condensation. Taking all characterization results together, we conclude that the catalytic performance of the rehydrated HTCs is determined by the “host” MgO component, rather than the nature of M3+.
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