Thermochemistry of alkali interactions with refractory adsorbents

F. Shadman, W. A. Punjak

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The kinetics and mechanism of interactions between alkali vapors and several refractory adsorbents are studied. A unique thermogravimetric reactor is designed and utilized for this study. Bauxite and kaolin are very good adsorbents for alkali chlorides and are potentially good additives for control of alkali during coal combustion and gasification. The experimental data shows that the alkali capturing process is a combination of physisorption, chemisorption and chemical reaction. An analytical model is developed assuming a multi-layer adsorption of alkali on substrate followed by a rate-controlling reaction on the surface. The experimental results and model predictions are in good agreement.

Original languageEnglish (US)
Pages (from-to)141-152
Number of pages12
JournalThermochimica Acta
Issue numberC
StatePublished - Aug 29 1988

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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