Impact of pretreatments on the selectivity of carbon for NOx adsorption/reduction

Bo Xia, Jonathan Phillips, Chun Ku Chen, Ljubisa R. Radovic, Isabel F. Silva, J. Angel Menéndez

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


At present the primary difficulty with employing carbon for the purposes of NOx removal is the lack of selectivity. Carbon generally reacts as readily with oxygen as with NO. Thus, carbons in lean-burn exhausts (O2/NO>100) generally `burn' rather than selectively removing NO. Here we report on microcalorimetric studies which show that high temperature (950 °C) hydrogen-treated carbons will adsorb NO at room temperature, but will not adsorb significant quantities of oxygen. In contrast, the same activated carbon treated at high temperature in nitrogen will strongly adsorb both species. The selective nature of the hydrogen-treated material and the less-selective nature of the nitrogen-treated material is fully consistent with an earlier model of carbon surface chemistry which highlights the contrast in the character and concentration of active surface species created by each of these treatments.

Original languageEnglish (US)
Pages (from-to)903-906
Number of pages4
JournalEnergy and Fuels
Issue number4
StatePublished - Jul 1999

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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