Influence of the preparation method on the structural properties of mixed metal oxides

Science and Technology of Materials Pub Date : 2018-09-01 DOI:10.1016/j.stmat.2018.07.001

Débora Morais Bezerra , Elisabete Moreira Assaf

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引用次数: 2

Abstract

In this paper, we report a study of the influence of the synthesis method on the properties of mixed metal oxides. For this, the syntheses of the mixed oxide by chemical coprecipitation and modified polymeric precursor (MPP) methods containing Ni²⁺, Zn²⁺, Al²⁺, and Zr⁴⁺ were conducted. For this purpose, the samples were characterized by X-ray powder diffraction, which showed defined peaks for the mixed metal oxides (NiO, ZnO, and ZrO₂). The interaction of H₂ with mixed oxides has been investigated using temperature-programmed reduction (H₂-TPR); this result showed that the modified polymer precursor method favored the presence of the peak at elevated temperatures. The N₂ physisorption (BET method) showed that the polymer precursor method provided higher specific surface areas and basic site numbers in relation to the coprecipitation method. Thermogravimetric analysis of the systems decomposition revealed their disintegration at ~550 °C and resulted in mixed metal oxides in both methods.

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制备方法对混合金属氧化物结构性能的影响

本文报道了合成方法对混合金属氧化物性能的影响。为此，采用化学共沉淀法和改性聚合前驱体(MPP)法制备了含Ni2+、Zn2+、Al2+和Zr4+的混合氧化物。为此，对样品进行了x射线粉末衍射表征，发现混合金属氧化物(NiO, ZnO和ZrO2)有明确的峰。采用程序升温还原法(H2- tpr)研究了H2与混合氧化物的相互作用;结果表明，改性聚合物前驱体法有利于在高温下出现峰。N2物理吸附(BET)实验表明，聚合物前驱体法比共沉淀法具有更高的比表面积和基位数。热重分析表明，在~550℃时，两种方法均产生混合金属氧化物。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Science and Technology of Materials

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