Preparation and Characterization of Dispersed Rh2O3 on Tetragonal ZrO2.

Abstract

Metal-support interactions have been proposed to explain a much lower chemisorption of hydrogen on Rh/Zr02 compared to Rh/gamma-A1203 catalysts. The decrease in H2 chemisorption properties, while retaining the ability to chemisorb 02, has been reported to be a characteristic of Strong Metal-Support Interactions (SMSI). It was the purpose of this study to prepare well-dispersed samples of Rh203 on Zr02 and relate the structural properties of the catalysts with their stability in reducing atmospheres. Changes in the structure of the phases formed and the temperatures at which reduction to Rh metal occur could then be related to the relative strengths of the catalyst support interactions. Samples of well-dispersed hexagonal Rh203 on tetragonal Zr02 have been prepared by the code composition of the nitrates at 900 C. A comparison of the stability towards reduction of the bulk and dispersed Rh203 products demonstrates the influence of an interaction between the dispersed metal oxide and the support.

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Document Details

Document Type
Technical Report
Publication Date
Apr 02, 1986
Accession Number
ADA166345

Entities

People

  • Aaron Wold
  • Kirby Dwight
  • Y-c. Zhang

Organizations

  • Brown University

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Bulk Materials
  • Carbon Monoxide
  • Catalysts
  • Chemistry
  • Dielectric Gases
  • Diffraction
  • Elements
  • Materials
  • Military Research
  • Oxides
  • Rhode Island
  • Security
  • United States
  • Universities
  • X Rays
  • X-Ray Diffraction

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Nanocomposite Materials Science
  • Powder metallurgy of Titanium alloys.