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Title: Micropore growth of endothermic gasification reaction

Abstract

Microscopic type solid-gas reaction models have the potential to predict micropore growth during a gasification reaction. The micropore length is assumed to be constant and gasification is assumed to enlarge the radius of all the pores. However none of the published activated carbon pore size distribution data indicates any significant increase in the average micropore size as predicted by these models. By analyzing these published data with the pore system proposed by Zygourakls et al. (1982), a steady state micropore length concept is developed. In this pore system, micropores are assumed to be growing uniformly on the surface of spherical macropores and mesopores are assumed to provide connection among macropores. The steady state micropore length concept is that gasification reaction takes place only on the macropore surface and the end of the micropores, and thus no reaction can occur on the micropore wall to enlarge the micropore size. Furthermore, the reaction on the macropore surface and micropore end will reach steady state in a short period of reaction time resulting in a steady state micropore length. Based on the consideration of the heat transfer caused by the endothermic gasification reaction, a micropore growth model to demonstrate the possibility of themore » steady state micropore length concept was derived. The improved model can predict the micropore volume changes much better than the Zygourakls' model for fully carbonized samples.« less

Authors:
Publication Date:
Research Org.:
Arkansas Univ., Fayetteville (USA)
OSTI Identifier:
7055665
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; ACTIVATED CARBON; MICROSTRUCTURE; COAL GASIFICATION; MATHEMATICAL MODELS; CHEMICAL REACTION KINETICS; DISTRIBUTION; HEAT TRANSFER; POROSITY; SIZE; STEADY-STATE CONDITIONS; ADSORBENTS; CARBON; CRYSTAL STRUCTURE; ELEMENTS; ENERGY TRANSFER; GASIFICATION; KINETICS; NONMETALS; REACTION KINETICS; THERMOCHEMICAL PROCESSES; 010404* - Coal, Lignite, & Peat- Gasification; 010600 - Coal, Lignite, & Peat- Properties & Composition

Citation Formats

Ko, C W. Micropore growth of endothermic gasification reaction. United States: N. p., 1986. Web.
Ko, C W. Micropore growth of endothermic gasification reaction. United States.
Ko, C W. 1986. "Micropore growth of endothermic gasification reaction". United States.
@article{osti_7055665,
title = {Micropore growth of endothermic gasification reaction},
author = {Ko, C W},
abstractNote = {Microscopic type solid-gas reaction models have the potential to predict micropore growth during a gasification reaction. The micropore length is assumed to be constant and gasification is assumed to enlarge the radius of all the pores. However none of the published activated carbon pore size distribution data indicates any significant increase in the average micropore size as predicted by these models. By analyzing these published data with the pore system proposed by Zygourakls et al. (1982), a steady state micropore length concept is developed. In this pore system, micropores are assumed to be growing uniformly on the surface of spherical macropores and mesopores are assumed to provide connection among macropores. The steady state micropore length concept is that gasification reaction takes place only on the macropore surface and the end of the micropores, and thus no reaction can occur on the micropore wall to enlarge the micropore size. Furthermore, the reaction on the macropore surface and micropore end will reach steady state in a short period of reaction time resulting in a steady state micropore length. Based on the consideration of the heat transfer caused by the endothermic gasification reaction, a micropore growth model to demonstrate the possibility of the steady state micropore length concept was derived. The improved model can predict the micropore volume changes much better than the Zygourakls' model for fully carbonized samples.},
doi = {},
url = {https://www.osti.gov/biblio/7055665}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}

Thesis/Dissertation:
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