Studies on the surface chemistry based on competitive adsorption of NOx-SO2 onto a KOH impregnated activated carbon in excess O2

Young Whan Lee; Jin Won Park; Jeong Ho Yun; Jung Hye Lee; Dae Ki Choi

doi:10.1021/es011510b

Studies on the surface chemistry based on competitive adsorption of NO_x-SO₂ onto a KOH impregnated activated carbon in excess O₂

Young Whan Lee, Jin Won Park, Jeong Ho Yun, Jung Hye Lee, Dae Ki Choi

Department of Chemical and Biomolecular Engineering

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

25 Citations (Scopus)

Abstract

This study identifies surface chemistry characteristics based on competitive behavior in the simultaneous adsorption behavior of NO_x (NO rich) and SO₂ using KOH impregnated activated carbon (K-IAC) in excess O₂. The NO_x and SO₂ adsorption on K-IAC occurred mainly through the acid-base reaction. The high surface area with many pores of activated carbon acted as storage places of oxide crystal produced from NO_x and SO₂ adsorption. KOH, an impregnant, provided the selective adsorption sites to NO_x and SO₂, enabling simultaneous adsorption. However, larger amounts of SO₂, with higher adsorption affinity to K-IAC compared to NO_x were adsorbed in a NO_x/SO₂ coexistent atmosphere. Oxygen was chemisorbed to K-IAC, which enhanced the selective adsorptivity for NO. In binary-component adsorption of NO_x and SO₂ on K-IAC, oxide crystals such as KNO_x (x = 2,3) and K₂SO_x (x = 3,4) were dominantly formed through two different adsorption mechanisms by chemical reaction. Depending on the extent that oxide crystals blocked pores, compositions of oxide crystals were distributed differently according to depth.

Original language	English
Pages (from-to)	4928-4935
Number of pages	8
Journal	Environmental Science and Technology
Volume	36
Issue number	22
DOIs	https://doi.org/10.1021/es011510b
Publication status	Published - 2002 Nov 15

All Science Journal Classification (ASJC) codes

Chemistry(all)
Environmental Chemistry

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title = "Studies on the surface chemistry based on competitive adsorption of NOx-SO2 onto a KOH impregnated activated carbon in excess O2",

abstract = "This study identifies surface chemistry characteristics based on competitive behavior in the simultaneous adsorption behavior of NOx (NO rich) and SO2 using KOH impregnated activated carbon (K-IAC) in excess O2. The NOx and SO2 adsorption on K-IAC occurred mainly through the acid-base reaction. The high surface area with many pores of activated carbon acted as storage places of oxide crystal produced from NOx and SO2 adsorption. KOH, an impregnant, provided the selective adsorption sites to NOx and SO2, enabling simultaneous adsorption. However, larger amounts of SO2, with higher adsorption affinity to K-IAC compared to NOx were adsorbed in a NOx/SO2 coexistent atmosphere. Oxygen was chemisorbed to K-IAC, which enhanced the selective adsorptivity for NO. In binary-component adsorption of NOx and SO2 on K-IAC, oxide crystals such as KNOx (x = 2,3) and K2SOx (x = 3,4) were dominantly formed through two different adsorption mechanisms by chemical reaction. Depending on the extent that oxide crystals blocked pores, compositions of oxide crystals were distributed differently according to depth.",

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AU - Lee, Young Whan

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AU - Lee, Jung Hye

AU - Choi, Dae Ki

PY - 2002/11/15

Y1 - 2002/11/15

N2 - This study identifies surface chemistry characteristics based on competitive behavior in the simultaneous adsorption behavior of NOx (NO rich) and SO2 using KOH impregnated activated carbon (K-IAC) in excess O2. The NOx and SO2 adsorption on K-IAC occurred mainly through the acid-base reaction. The high surface area with many pores of activated carbon acted as storage places of oxide crystal produced from NOx and SO2 adsorption. KOH, an impregnant, provided the selective adsorption sites to NOx and SO2, enabling simultaneous adsorption. However, larger amounts of SO2, with higher adsorption affinity to K-IAC compared to NOx were adsorbed in a NOx/SO2 coexistent atmosphere. Oxygen was chemisorbed to K-IAC, which enhanced the selective adsorptivity for NO. In binary-component adsorption of NOx and SO2 on K-IAC, oxide crystals such as KNOx (x = 2,3) and K2SOx (x = 3,4) were dominantly formed through two different adsorption mechanisms by chemical reaction. Depending on the extent that oxide crystals blocked pores, compositions of oxide crystals were distributed differently according to depth.

AB - This study identifies surface chemistry characteristics based on competitive behavior in the simultaneous adsorption behavior of NOx (NO rich) and SO2 using KOH impregnated activated carbon (K-IAC) in excess O2. The NOx and SO2 adsorption on K-IAC occurred mainly through the acid-base reaction. The high surface area with many pores of activated carbon acted as storage places of oxide crystal produced from NOx and SO2 adsorption. KOH, an impregnant, provided the selective adsorption sites to NOx and SO2, enabling simultaneous adsorption. However, larger amounts of SO2, with higher adsorption affinity to K-IAC compared to NOx were adsorbed in a NOx/SO2 coexistent atmosphere. Oxygen was chemisorbed to K-IAC, which enhanced the selective adsorptivity for NO. In binary-component adsorption of NOx and SO2 on K-IAC, oxide crystals such as KNOx (x = 2,3) and K2SOx (x = 3,4) were dominantly formed through two different adsorption mechanisms by chemical reaction. Depending on the extent that oxide crystals blocked pores, compositions of oxide crystals were distributed differently according to depth.

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Studies on the surface chemistry based on competitive adsorption of NO_x-SO₂ onto a KOH impregnated activated carbon in excess O₂

Abstract

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