Adsorption of Hg and NOX on coal by-products

Aurora Rubel, Rodney Andrews, Rolando Gonzalez, Jack Groppo, Thomas Robl

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


The adsorption of Hg and NOX on gasifier and combustion by-products was investigated. Carbon-rich fractions were produced by a density separation technique from a gasifier char (GC) and a pulverized coal combustion blended fly/bottom ash (CC) recovered from a pond. Both fractions were subjected to steam activation at 875 °C. As-received and activated chars and two commercial carbons developed specifically for Hg and NOX adsorption were tested and compared for Hg and NOX adsorption capacities. The Hg adsorption capacity of GC was found as good as a specialty commercial carbon designed for Hg capture from flue gases. Steam activation or heating to 900 °C destroyed GC's adsorption capability. GC adsorbed one-third of the NOX uptake of a commercial carbon used for NOX adsorption. Hg-laden GC captured even more NOX than the as-received GC. Possible explanations for the performance of GC will be discussed. The CC material was a poor performer for both Hg and NOX capture.

Original languageEnglish
Pages (from-to)911-916
Number of pages6
Issue number7-8
StatePublished - May 2005

Bibliographical note

Funding Information:
This material is based upon work supported by the Department of Energy, Federal Energy Technology Center under Cooperative Agreement DE-FC26-98FT40350. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the reviews of the Department of Energy, Federal Energy Technology Center.


  • Coal by-products
  • Mercury
  • NO

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry


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