The Application of HREELS to Model Catalysts: CO and C2H4 Adsorption on Pt/Al2O3

Abstract

A model catalyst made by platinum vapor deposition onto a thin alumina film is investigated with Transmission Electron Microscopy and High Resolution Electron Energy Loss Spectroscopy. The preparation techniques are fully described, then the results of TEM analysis for platinum deposits from 0.3 monolayers to 1.7 monolayers are reported, for which clusters varying from 1.0 to 1.6 nanometers in diameter are observed. High Resolution Electron Energy Loss Spectroscopy spectra are reported for the cases of carbon monoxide and ethylene adsorption onto the model. For the case of CO adsorption, it is shown that the catalyst is stable when heated to 500 K. For the case of ethylene adsorption, pi and di-sigma species are identified for adsorption at 165 K, but on warming to 325 K, ethylidyne is only observed for the larger platinum deposits. This is first High Resolution Electron Energy Loss Spectroscopy observation of the ethylidyne species on alumina supported catalysts. (JG)

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Document Details

Document Type
Technical Report
Publication Date
May 20, 1990
Accession Number
ADA222744

Entities

People

  • D. A. Hensley
  • L. L. Kesmodel

Organizations

  • Indiana University Bloomington

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Alkenes
  • Aluminum Oxides
  • Catalysts
  • Chemical Synthesis
  • Chemistry
  • Ethylenes
  • Films
  • High Resolution
  • Hydrocarbons
  • Measurement
  • Military Research
  • Oxides
  • Oxygen
  • Physical Chemistry
  • Spectra
  • Spectroscopy
  • Transition Metals

Fields of Study

  • Chemistry

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene