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The Regeneration of High Temperature Sulfur Dioxide Sorbents: the CO Reduction of Supported Alkali Sulfates

Citation

Weston, Theresa Ann (1985) The Regeneration of High Temperature Sulfur Dioxide Sorbents: the CO Reduction of Supported Alkali Sulfates. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/cen1-hb98. https://resolver.caltech.edu/CaltechTHESIS:01032019-104846124

Abstract

The chemical reactions involved in the regeneration step of a high temperature SO2 removal process have been investigated. In particular, the CO reduction of supported alkali sulfates has been studied. Thermogravimetric measurements have yielded the time-resolved composition of sorbent and gaseous products during reduction with 10% CO at 700 and 800°C. FTIR was used to identify reaction intermediates . A flow microreactor was used to compare gaseous product selectivity between SO2, COS and elemental sulfur of sorbents reduced with 1 and 10% CO at 700 and 800°C.

The experimental results show regeneration; i.e., sulfur removal is greatly increased by the presence of lithium in the sorbent material. Reaction between the support and the alkali material greatly influences the degree of regeneration. Support materials are apparently active in the catalysis of the reduction of SO2 to elemental sulfur and the reaction between elemental sulfur and CO to form COS, and therefore, influences the product selectivity. A reaction scheme which qualitatively explains the experimental results is proposed.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Chemical Engineering
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Gavalas, George R.
Thesis Committee:
  • Gavalas, George R. (chair)
  • Seinfeld, John H.
  • Bailey, James E.
  • Voecks, Gerald E.
Defense Date:6 May 1985
Record Number:CaltechTHESIS:01032019-104846124
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:01032019-104846124
DOI:10.7907/cen1-hb98
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11331
Collection:CaltechTHESIS
Deposited By: Lisa Fischelis
Deposited On:03 Jan 2019 19:59
Last Modified:16 Apr 2021 23:21

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