Catalytic and structural properties of ruthenium bimetallic catalysts: Preparation and characterization

Q4 Chemical Engineering

分子催化 Pub Date : 1994-08-12 DOI:10.1016/0304-5102(94)85006-2

Bernard Coq ∗ , Eleanor Crabb , Mayukh Warawdekar , Geoffrey C. Bond , Joop C. Slaa , Signorino Galvagno , Lucina Mercadante , Joaquin Garcia Ruiz , Maria Conception Sanchez Sierra

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引用次数: 40

Abstract

In the framework of an EC Stimulation Action Programme, alumina-supported mono- and bimetallic Ru, RuGe, RuSn and RuPb catalysts have been prepared from both organic and inorganic precursors. Herein are presented some basic properties of these materials obtained by TPR and TPO experiments, H₂ and CO chemisorption, TEM examination, XPS and EXAFS studies. The use of organic precursors led to very small Ru particles, with a coordination number between Ru atoms of 4.35 (Ru⁰-Ru⁰+Ru⁰-Ru^δ+). The size of the metallic particles was not modified by adding Ge, Sn or Pb by the controlled surface reaction technique. In very small aggregates, some Ru atoms (10–15%) remained partially oxidised even after reduction at 623 K in flowing hydrogen. During the coimpregnation of alumina with inorganic precursors, the modifier played the role of a nucleation center for Ru, thus allowing small particles to be formed. We believe that CO could modify the surface composition of small bimetallic RuGe particles during the chemisorption.

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钌双金属催化剂的催化和结构性能:制备和表征

在EC刺激行动方案的框架内，用有机和无机前体制备了氧化铝支持的单金属和双金属Ru、RuGe、RuSn和RuPb催化剂。本文介绍了通过TPR和TPO实验、H2和CO化学吸附、TEM、XPS和EXAFS研究获得的这些材料的一些基本性能。有机前驱体的使用使Ru颗粒非常小，Ru原子之间的配位数为4.35 (Ru0-Ru0+Ru0-Ruδ+)。通过控制表面反应技术，添加Ge、Sn或Pb均未改变金属颗粒的尺寸。在非常小的团聚体中，一些Ru原子(10-15%)即使在623 K的流动氢中还原后仍部分氧化。在氧化铝与无机前驱体共浸渍过程中，改性剂对Ru起到了成核中心的作用，从而形成了小颗粒。我们认为CO可以在化学吸附过程中改变小双金属RuGe颗粒的表面组成。

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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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.