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首页> 外文期刊>Chemical Engineering Science >In situ growth of layered double hydroxide films on anodic aluminum oxide/aluminum and its catalytic feature in aldol condensation of acetone
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In situ growth of layered double hydroxide films on anodic aluminum oxide/aluminum and its catalytic feature in aldol condensation of acetone

机译：阳极氧化铝/铝上层状双氢氧化物膜的原位生长及其在丙酮醛醇缩合反应中的催化作用

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摘要

Mg/Al layered double hydroxide (LDH) films were fabricated in situ with anodic aluminum oxide (AAO)/aluminum as both the substrate and the sole aluminum source by means of urea hydrolysis. The structure and morphology of the LDH films were investigated by X-ray diffraction (XRD), attenuated total reflectance-Fourier transform infrared (ATR-FT-IR) and scanning electron microscopy (SEM), which show that hexagonal plate-shaped LDH crystallites grow perpendicularly on the substrate via a strong chemical interaction. After being activated by a calcination/rehydration procedure, the rehydrated LDH (RLDH) platelets remain firmly immobilized on the AAC/aluminum substrate and retain the hexagonal platelet morphology of the LDH precursor. The catalytic activity of the resulting material was tested by using aldol condensation of acetone as a probe reaction, showing that the RLDH/AAO is superior in catalytic performance to the powdered RLDH analogue. The kinetic feature of this catalytic reaction was also analyzed, which suggests that it obeys the D, kinetic model, a one-dimensional diffusion-controlled mechanism. (C) 2008 Elsevier Ltd. All rights reserved.
机译：Mg / Al层状双氢氧化物（LDH）薄膜是通过尿素水解原位制备阳极氧化铝（AAO）/铝作为基材和唯一铝源。通过X射线衍射（XRD），衰减全反射-傅立叶变换红外光谱（ATR-FT-IR）和扫描电镜（SEM）研究了LDH薄膜的结构和形貌，表明六角形的板状LDH晶体通过强烈的化学相互作用在基底上垂直生长。通过煅烧/再水化程序活化后，再水化的LDH（RLDH）血小板仍牢固地固定在AAC /铝基质上，并保持LDH前体的六方血小板形态。通过使用丙酮的羟醛缩合作为探针反应来测试所得材料的催化活性，表明RLDH / AAO的催化性能优于粉末状的RLDH类似物。还分析了该催化反应的动力学特征，这表明其遵循D动力学模型，即一维扩散控制机制。 （C）2008 Elsevier Ltd.保留所有权利。

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