NO{sub x} and SO{sub 2} adsorption on carbon
- Univ. of Kentucky, Lexington, KY (United States)
The adsorption mechanisms of NO{sub x} and SO{sub 2} on carbons were studied using adsorption/desorption profiles generated by thermal analysis-mass spectrometry (TG-MS). Three different simulated flue gas mixtures were used, all containing O{sub 2}, CO{sub 2}, and H{sub 2}O and either NO or SO{sub 2} or both. Results suggested that NO{sub 2} and SO{sub 2} were adsorbed by two separate adsorption mechanisms. NO{sub 2} was probably condensed within the pores of the carbon after catalytic conversion of NO + 1/2 O{sub 2} {yields} > NO{sub 2} at an active site(s) on the carbon. Adsorption of SO{sub 2}, without NO, had a complex adsorption mechanism involving three roes of SO{sub 2} species, a condensed SO{sub 2} and two species of SO{sub 2} bound to active sites. In the presence of NO, the adsorbed SO{sub 2} was primarily a more strongly bound SO{sub 2} species. The presence of SO{sub 2} decreased the overall (NO + SO{sub 2}) adsorption rate and SO{sub 2} may have inhibited or blocked a site involved in the catalytic formation of NO{sub 2}. Co-adsorption of both NO{sub 2} and SO{sub 2} produced a synergism which filed in binding SO{sub 2} to the carbon.
- OSTI ID:
- 370326
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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