The effect of preparation methods on the properties of zirconia/silicas

Q4 Chemical Engineering

分子催化 Pub Date : 1994-11-13 DOI:10.1016/0304-5102(94)87031-4

Makoto Toba , Fujio Mizukami , Shu-ichi Niwa , Tsuneji Sano , Kazuyuki Maeda , Arto Annila , Veikko Komppa

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引用次数: 32

Abstract

Zirconia/silicas were prepared by three methods, namely complexing-agent assisted sol—gel, coprecipitation and hydrogel kneading. The relationship between the preparation methods and properties of the zirconia/silicas was investigated by X-ray powder diffraction, solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR), ammonia temperature-programmed desorption (TPD) and nitrogen adsorption. Among the three methods, the complexing-agent assisted sol—gel method gave the most homogeneous zirconia/silicas and the ZrOSi bond formation. The specific surface area of the zirconia/silicas depended on the complexing agents used in the preparations and the Zr/Si ratios. In contrast, the kneaded zirconia/silicas were relatively heterogeneous and their properties did not depend on the Zr/Si ratio. In the dependence of properties of zirconia/silicas on the Zr/Si ratio, the coprecipitation zirconia/silicas are intermediate between the complexing-agent assisted sol—gel and kneaded ones.

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制备方法对氧化锆/二氧化硅性能的影响

采用络合剂辅助溶胶-凝胶法、共沉淀法和水凝胶揉捏法制备氧化锆/二氧化硅。采用x射线粉末衍射、固态魔角自旋核磁共振(MAS-NMR)、氨程序升温解吸(TPD)和氮气吸附等方法研究了氧化锆/二氧化硅的制备方法与性能的关系。三种方法中，络合剂辅助的溶胶-凝胶法得到的氧化锆/二氧化硅最均匀，ZrOSi键形成最均匀。氧化锆/二氧化硅的比表面积取决于制备中使用的络合剂和Zr/Si比。相比之下，揉制的氧化锆/二氧化硅相对不均匀，其性能与Zr/Si比无关。在Zr/Si比对氧化锆/二氧化硅性能的影响中，共沉淀法的氧化锆/二氧化硅介于络合剂辅助的溶胶-凝胶和捏合法之间。

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来源期刊

分子催化 Chemical Engineering-Catalysis

CiteScore

1.50

自引率

0.00%

发文量

2959

期刊介绍： Journal of Molecular Catalysis (China) is a bimonthly journal, founded in 1987. It is a bimonthly journal, founded in 1987, sponsored by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, under the supervision of Chinese Academy of Sciences, and published by Science Publishing House, which is a scholarly journal openly circulated both at home and abroad. The journal mainly reports the latest progress and research results on molecular catalysis. It contains academic papers, research briefs, research reports and progress reviews. The content focuses on coordination catalysis, enzyme catalysis, light-ribbed catalysis, stereochemistry in catalysis, catalytic reaction mechanism and kinetics, the study of catalyst surface states and the application of quantum chemistry in catalysis. We also provide contributions on the activation, deactivation and regeneration of homogeneous catalysts, solidified homogeneous catalysts and solidified enzyme catalysts in industrial catalytic processes, as well as on the optimisation and characterisation of catalysts for new catalytic processes. The main target readers are scientists and postgraduates working in catalysis in research institutes, industrial and mining enterprises, as well as teachers and students of chemistry and chemical engineering departments in colleges and universities. Contributions from related professionals are welcome.