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

doi:10.1021/ie001068q

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

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

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

KOH-impregnated activated carbon (K-IAC) was studied as a NO_x 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 NO_x is lost faster. By using AES/SAM and ToF-SIMS, we examined the chemical characteristics created on K-IAC through adsorption of NO_x. Oxide crystals formed on the surface of K-IAC after adsorption of NO_x 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 NO_x and K-IAC.

Original language	English
Pages (from-to)	3337-3345
Number of pages	9
Journal	Industrial and Engineering Chemistry Research
Volume	40
Issue number	15
DOIs	https://doi.org/10.1021/ie001068q
Publication status	Published - 2001 Jul 15

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Industrial and Manufacturing Engineering

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10.1021/ie001068q

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

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.",

author = "Lee, {Y. W.} and Choi, {D. K.} and Park, {J. W.}",

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AU - Lee, Y. W.

AU - Choi, D. K.

AU - Park, J. W.

PY - 2001/7/15

Y1 - 2001/7/15

N2 - 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.

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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