Temperature programmed desorption of sorbates from zeolites. Part I. Constant coverage, variable heating rate method

Robin E. Richards, Lovat V.C. Rees

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

A new method of analysing temperature programmed desorption (t.p.d.) curves measured at different heating rates has been developed. The activation energy for desorption (Ed) and pre-exponential factor (A) have been evaluated at constant coverages by a minimization procedure for ethanol, n-hexane, n-octane, and p-xylene ZSM-5/silicalite-1 pairs. The t.p.d. curves were recorded on a conventional thermogravimetric balance interfaced to a microcomputer, which was used for both data collection and analysis. The Ed values compare favourably with published isoteric and calorimetric heats of adsorption. Advantages of this method are the rapidity of data collection and ease of analysis. The quantitative desorption information obtained could be of valuable assistance to catalyst screening for the characterization of sorbent-sorbate interaction, and in particular to the study of zeolitic acid sites by ammonia desorption.

Original languageEnglish (US)
Pages (from-to)17-25
Number of pages9
JournalZeolites
Volume6
Issue number1
DOIs
StatePublished - Jan 1986
Externally publishedYes

Keywords

  • Temperature programmed desorption
  • ZSM-5
  • ethanol
  • hydrocarbons
  • silicalite

ASJC Scopus subject areas

  • Environmental Science(all)

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