Surface chemical characterization using AES/SAM and ToF-SIMS on KOH-impregnated activated carbon by selective adsorption of NOx

Y. W. Lee, D. K. Choi, J. W. Park

Research output: Contribution to journalArticle

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Abstract

KOH-impregnated activated carbon (K-IAC) was studied as a NOx adsorbent. When adsorbing NO2/air to K-IAC, as the concentration increases, the removal efficiency relatively decreases because the function of the selective adsorption site for NOx is lost faster. By using AES/SAM and ToF-SIMS, we examined the chemical characteristics created on K-IAC through adsorption of NOx. Oxide crystals formed on the surface of K-IAC after adsorption of NOx was a result of the chemical bond among K, N, and O. KNO3 was predominantly distributed on the external surface, and the pore of K-IAC showed blocking from the crystal growth of KNO3. The results showed that surface basic OH-, well developed on the surface because of KOH impregnation, acts as a selective adsorption site. This study pointedly illustrates selective adsorption behavior from strong chemical interaction between NOx and K-IAC.

Original languageEnglish
Pages (from-to)3337-3345
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume40
Issue number15
Publication statusPublished - 2001 Jul 15

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Secondary ion mass spectrometry
Activated carbon
activated carbon
adsorption
Adsorption
crystal
Chemical bonds
Crystallization
Crystal growth
Impregnation
Adsorbents
Oxides
chemical
oxide
Crystals
air
Air

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

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Surface chemical characterization using AES/SAM and ToF-SIMS on KOH-impregnated activated carbon by selective adsorption of NOx . / Lee, Y. W.; Choi, D. K.; Park, J. W.

In: Industrial and Engineering Chemistry Research, Vol. 40, No. 15, 15.07.2001, p. 3337-3345.

Research output: Contribution to journalArticle

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AB - KOH-impregnated activated carbon (K-IAC) was studied as a NOx adsorbent. When adsorbing NO2/air to K-IAC, as the concentration increases, the removal efficiency relatively decreases because the function of the selective adsorption site for NOx is lost faster. By using AES/SAM and ToF-SIMS, we examined the chemical characteristics created on K-IAC through adsorption of NOx. Oxide crystals formed on the surface of K-IAC after adsorption of NOx was a result of the chemical bond among K, N, and O. KNO3 was predominantly distributed on the external surface, and the pore of K-IAC showed blocking from the crystal growth of KNO3. The results showed that surface basic OH-, well developed on the surface because of KOH impregnation, acts as a selective adsorption site. This study pointedly illustrates selective adsorption behavior from strong chemical interaction between NOx and K-IAC.

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