Structural elucidation of physical and chemical activation mechanisms based on the microdomain structure model

Doo Won Kim, Hyun Sig Kil, Koji Nakabayashi, Seong Ho Yoon, Jin Miyawaki

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Activated carbons (ACs) prepared by chemical activation commonly show higher specific surface areas and higher yields than those prepared by physical activation. In this study, the differences in the pore development mechanisms between physical and chemical activation processes for AC preparation were studied from a structural point of view, based on the microdomain structure model. Phenol resin-based spherical carbon was used as the starting material. AC preparation via potassium hydroxide (KOH) activation (chemical activation) did not induce noticeable changes in the particle or microdomain sizes, despite the abundant development of pores. On the other hand, ACs produced via steam activation (physical activation) showed remarkable reductions in both particle and microdomain sizes, depending on the activation temperature. Considering the differences in activation yield and degree of developed porosity between chemical and physical activations, we concluded that, in the case of KOH activation, pore development homogeneously progressed overall for all microdomains consisting of carbon particles without apparent morphological change; however, steam activation caused inhomogeneous gasification from the outer surface of the carbon particles and microdomains. For this reason, KOH-ACs showed higher yield and superior pore development.

Original languageEnglish
Pages (from-to)98-105
Number of pages8
JournalCarbon
Volume114
DOIs
Publication statusPublished - Apr 1 2017

Fingerprint

Model structures
Chemical activation
Activated carbon
Carbon
Steam
Potassium hydroxide
Phenol
Gasification
Specific surface area
Phenols
Resins
Porosity

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Structural elucidation of physical and chemical activation mechanisms based on the microdomain structure model. / Kim, Doo Won; Kil, Hyun Sig; Nakabayashi, Koji; Yoon, Seong Ho; Miyawaki, Jin.

In: Carbon, Vol. 114, 01.04.2017, p. 98-105.

Research output: Contribution to journalArticle

@article{2a34987971ef41b182c13e264fbd46f8,
title = "Structural elucidation of physical and chemical activation mechanisms based on the microdomain structure model",
abstract = "Activated carbons (ACs) prepared by chemical activation commonly show higher specific surface areas and higher yields than those prepared by physical activation. In this study, the differences in the pore development mechanisms between physical and chemical activation processes for AC preparation were studied from a structural point of view, based on the microdomain structure model. Phenol resin-based spherical carbon was used as the starting material. AC preparation via potassium hydroxide (KOH) activation (chemical activation) did not induce noticeable changes in the particle or microdomain sizes, despite the abundant development of pores. On the other hand, ACs produced via steam activation (physical activation) showed remarkable reductions in both particle and microdomain sizes, depending on the activation temperature. Considering the differences in activation yield and degree of developed porosity between chemical and physical activations, we concluded that, in the case of KOH activation, pore development homogeneously progressed overall for all microdomains consisting of carbon particles without apparent morphological change; however, steam activation caused inhomogeneous gasification from the outer surface of the carbon particles and microdomains. For this reason, KOH-ACs showed higher yield and superior pore development.",
author = "Kim, {Doo Won} and Kil, {Hyun Sig} and Koji Nakabayashi and Yoon, {Seong Ho} and Jin Miyawaki",
year = "2017",
month = "4",
day = "1",
doi = "10.1016/j.carbon.2016.11.082",
language = "English",
volume = "114",
pages = "98--105",
journal = "Carbon",
issn = "0008-6223",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Structural elucidation of physical and chemical activation mechanisms based on the microdomain structure model

AU - Kim, Doo Won

AU - Kil, Hyun Sig

AU - Nakabayashi, Koji

AU - Yoon, Seong Ho

AU - Miyawaki, Jin

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Activated carbons (ACs) prepared by chemical activation commonly show higher specific surface areas and higher yields than those prepared by physical activation. In this study, the differences in the pore development mechanisms between physical and chemical activation processes for AC preparation were studied from a structural point of view, based on the microdomain structure model. Phenol resin-based spherical carbon was used as the starting material. AC preparation via potassium hydroxide (KOH) activation (chemical activation) did not induce noticeable changes in the particle or microdomain sizes, despite the abundant development of pores. On the other hand, ACs produced via steam activation (physical activation) showed remarkable reductions in both particle and microdomain sizes, depending on the activation temperature. Considering the differences in activation yield and degree of developed porosity between chemical and physical activations, we concluded that, in the case of KOH activation, pore development homogeneously progressed overall for all microdomains consisting of carbon particles without apparent morphological change; however, steam activation caused inhomogeneous gasification from the outer surface of the carbon particles and microdomains. For this reason, KOH-ACs showed higher yield and superior pore development.

AB - Activated carbons (ACs) prepared by chemical activation commonly show higher specific surface areas and higher yields than those prepared by physical activation. In this study, the differences in the pore development mechanisms between physical and chemical activation processes for AC preparation were studied from a structural point of view, based on the microdomain structure model. Phenol resin-based spherical carbon was used as the starting material. AC preparation via potassium hydroxide (KOH) activation (chemical activation) did not induce noticeable changes in the particle or microdomain sizes, despite the abundant development of pores. On the other hand, ACs produced via steam activation (physical activation) showed remarkable reductions in both particle and microdomain sizes, depending on the activation temperature. Considering the differences in activation yield and degree of developed porosity between chemical and physical activations, we concluded that, in the case of KOH activation, pore development homogeneously progressed overall for all microdomains consisting of carbon particles without apparent morphological change; however, steam activation caused inhomogeneous gasification from the outer surface of the carbon particles and microdomains. For this reason, KOH-ACs showed higher yield and superior pore development.

UR - http://www.scopus.com/inward/record.url?scp=85003031557&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85003031557&partnerID=8YFLogxK

U2 - 10.1016/j.carbon.2016.11.082

DO - 10.1016/j.carbon.2016.11.082

M3 - Article

AN - SCOPUS:85003031557

VL - 114

SP - 98

EP - 105

JO - Carbon

JF - Carbon

SN - 0008-6223

ER -