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首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >Cu hydrotalcite-like compounds: Morphological, structural and microstructural properties
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Cu hydrotalcite-like compounds: Morphological, structural and microstructural properties

机译：铜水滑石样化合物：形态，结构和微结构特性

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摘要

Copper containing mixed oxides are widely employed as catalysts for the synthesis of methanol, higher alcohol, hydrocarbons from syngas at low temperature and pressure, and for NiO_x reduction. In this work, a series of Mg-Al-Cu, as hydrotalcite-like compounds (Cu-HTlcs) precursors of mixed oxides were synthesized by direct coprecipitation. The effect of pH, Cu content and mechanical milling on the structure and texture of these materials was investigated. The obtained materials were characterized by X-ray diffraction, differential scanning calorimetry, scanning and transmission electron microscopy and BET surface area measurements. The results showed that the materials were nanocrystalline powders. The Cu-HTlcs has a hexagonal unit cell. The a and c parameters increased as a function of the Cu content in both milled and non-milled samples. Crystallite size also increased with Cu content in both cases and smaller for non-milled samples. In contrast, microstrain values were greater for milled samples. BET area decreased with Cu content and showed that materials synthesized were mesoporous type. Mechanical milling did not destroy the morphology of the samples.
机译：含铜的混合氧化物被广泛用作在低温和低压下由合成气合成甲醇，高级醇，碳氢化合物以及还原NiO_x的催化剂。在这项工作中，通过直接共沉淀合成了一系列Mg-Al-Cu，作为混合氧化物的水滑石样化合物（Cu-HTlcs）前体。研究了pH，Cu含量和机械研磨对这些材料的结构和织构的影响。通过X射线衍射，差示扫描量热法，扫描和透射电子显微镜以及BET表面积测量来表征所获得的材料。结果表明，该材料为纳米晶体粉末。 Cu-HTlc具有六角形的晶胞。在研磨和非研磨样品中，a和c参数均随Cu含量的增加而增加。在两种情况下，微晶尺寸均随Cu含量的增加而增加，而对于非研磨样品，微晶的尺寸也较小。相反，研磨样品的微应变值更大。 BET面积随Cu含量的增加而降低，表明合成的材料为介孔型。机械研磨并没有破坏样品的形态。

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