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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Preparation and characterization of nickel based catalysts on silica, alumina and titania obtained by sol-gel method
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Preparation and characterization of nickel based catalysts on silica, alumina and titania obtained by sol-gel method

机译：溶胶-凝胶法制得的二氧化硅，氧化铝和二氧化钛镍基催化剂的制备与表征

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摘要

This work reports the investigation of the characteristics of catalysts produced by the sol gel process. Our analysis focuses on the properties related to heterogeneous catalysis, such as methane steam reforming, dry reforming, hydrogenation of organic compositions. Alumina, silica and titania based materials doped with Ni were synthesized. The characterization techniques used were: temperature programmed reduction, thermogravimetric analysis, specific surface area and X-ray powder diffraction. The specific surface area values obey the following sequence: Ni-SiO2 > Ni-Al2O3 > Ni-TiO2. The temperature programmed reduction indicated that in the Ni-SiO2 sample, the nickel oxide is present in two different forms on the surface; the Ni-Al2O3 material presented one peak at high temperature, suggesting the presence of a nickel aluminate form. However, Ni-TiO2 did not present reduction peaks. The thermogravimetric analysis, which was performed under inert atmosphere, showed the decomposition of the organic residues adsorbed on surface. The X-ray powder diffraction patterns of calcined materials showed two crystalline forms for TiO2 in Ni-TiO2 rutile and anatase. In Ni-Al(2)O3, crystalline areas composed of alpha-Al2O3, gamma-Al2O3 and NiO were observed and finally for Ni-SiO2, amorphous areas and NiO were found. (c) 2006 Elsevier B.V. All rights reserved.
机译：这项工作报告了对通过溶胶凝胶法生产的催化剂特性的研究。我们的分析着重于与多相催化有关的性质，例如甲烷蒸汽重整，干重整，有机组合物的加氢。合成了掺杂有Ni的氧化铝，二氧化硅和二氧化钛基材料。使用的表征技术为：程序升温还原，热重分析，比表面积和X射线粉末衍射。比表面积值遵循以下顺序：Ni-SiO 2> Ni-Al 2 O 3> Ni-TiO 2。程序升温还原表明，在Ni-SiO2样品中，氧化镍以两种不同的形式存在于表面。 Ni-Al2O3材料在高温下出现一个峰，表明存在铝酸镍形式。但是，Ni-TiO2没有出现还原峰。在惰性气氛下进行的热重分析表明，吸附在表面的有机残留物分解了。煅烧材料的X射线粉末衍射图谱显示在Ni-TiO2金红石和锐钛矿中TiO2有两种结晶形式。在Ni-Al（2）O3中，观察到由α-Al2O3，γ-Al2O3和NiO组成的结晶区，最后对于Ni-SiO2，发现了非晶区和NiO。 （c）2006 Elsevier B.V.保留所有权利。

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