Enhancement of SO2 sorption on lime by structure modifiers

F. Shadman, P. E. Dombek

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The presence of certain inert compounds in lime can improve the rate and the final limiting conversion significantly during the lime SO2 reaction. This physical effect is primarily due to modification of porosity. In particular, the enhancement appears to he due to increase in macro‐porosity and macro‐pore diffusivity; this in turn increases the sulfation rate and decreases pore plugging. In certain lime application processes, these compounds (structure modifiers) can be added to lime as beneficial additives to promote the reaction. Experimental data on the effect of kaolin, silica and bauxite as structure modifiers are presented. A theoretical model is developed which explains the observed effects both qualitatively and quantitatively.

Original languageEnglish (US)
Pages (from-to)930-935
Number of pages6
JournalThe Canadian Journal of Chemical Engineering
Issue number6
StatePublished - Dec 1988


  • additives to lime sorbents
  • lime sulfation
  • sulfur dioxide sorption

ASJC Scopus subject areas

  • General Chemical Engineering


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