ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS.

L. R. Radovic, P. L. Walker, R. G. Jenkins

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A fundamental gasification study has been made on a North Dakota lignite. A very wide range of char reactivities was obtained by varying pyrolysis conditions and pretreatment of the lignite. For the predominantly uncatalyzed gasification reaction, carbon active site concentration was shown to be a meaningful reactivity index for demineralized chars and for carbons of varying crystallinity. For raw lignite chars, it was shown that CaO is the predominant catalytic species responsible for their high gasification reactivities. Lignite char gasification should be regarded as a catalyzed gas-solid reaction with the catalyst dispersion being the relevant reactivity parameter. When rates are expressed as turnover frequencies, observed reactivity differences of as much as 200-fold are reduced to within one order of magnitude. The commonly observed phenomenon of coal char deactivation with increasing pyrolysis severity was correlated with decreases in carbon active surface area and catalyst dispersion.

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
PublisherGovernment Inst Inc
Pages439-450
Number of pages12
ISBN (Print)0865871272
StatePublished - Dec 1 1985

Fingerprint

Lignite
Gasification
Catalysis
Carbon
Pyrolysis
Catalysts
Coal
Gases

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Radovic, L. R., Walker, P. L., & Jenkins, R. G. (1985). ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS. In Unknown Host Publication Title (pp. 439-450). Government Inst Inc.
Radovic, L. R. ; Walker, P. L. ; Jenkins, R. G. / ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS. Unknown Host Publication Title. Government Inst Inc, 1985. pp. 439-450
@inproceedings{970d167a95334be196a3b5deb34f662c,
title = "ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS.",
abstract = "A fundamental gasification study has been made on a North Dakota lignite. A very wide range of char reactivities was obtained by varying pyrolysis conditions and pretreatment of the lignite. For the predominantly uncatalyzed gasification reaction, carbon active site concentration was shown to be a meaningful reactivity index for demineralized chars and for carbons of varying crystallinity. For raw lignite chars, it was shown that CaO is the predominant catalytic species responsible for their high gasification reactivities. Lignite char gasification should be regarded as a catalyzed gas-solid reaction with the catalyst dispersion being the relevant reactivity parameter. When rates are expressed as turnover frequencies, observed reactivity differences of as much as 200-fold are reduced to within one order of magnitude. The commonly observed phenomenon of coal char deactivation with increasing pyrolysis severity was correlated with decreases in carbon active surface area and catalyst dispersion.",
author = "Radovic, {L. R.} and Walker, {P. L.} and Jenkins, {R. G.}",
year = "1985",
month = "12",
day = "1",
language = "English (US)",
isbn = "0865871272",
publisher = "Government Inst Inc",
pages = "439--450",
booktitle = "Unknown Host Publication Title",

}

Radovic, LR, Walker, PL & Jenkins, RG 1985, ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS. in Unknown Host Publication Title. Government Inst Inc, pp. 439-450.

ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS. / Radovic, L. R.; Walker, P. L.; Jenkins, R. G.

Unknown Host Publication Title. Government Inst Inc, 1985. p. 439-450.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS.

AU - Radovic, L. R.

AU - Walker, P. L.

AU - Jenkins, R. G.

PY - 1985/12/1

Y1 - 1985/12/1

N2 - A fundamental gasification study has been made on a North Dakota lignite. A very wide range of char reactivities was obtained by varying pyrolysis conditions and pretreatment of the lignite. For the predominantly uncatalyzed gasification reaction, carbon active site concentration was shown to be a meaningful reactivity index for demineralized chars and for carbons of varying crystallinity. For raw lignite chars, it was shown that CaO is the predominant catalytic species responsible for their high gasification reactivities. Lignite char gasification should be regarded as a catalyzed gas-solid reaction with the catalyst dispersion being the relevant reactivity parameter. When rates are expressed as turnover frequencies, observed reactivity differences of as much as 200-fold are reduced to within one order of magnitude. The commonly observed phenomenon of coal char deactivation with increasing pyrolysis severity was correlated with decreases in carbon active surface area and catalyst dispersion.

AB - A fundamental gasification study has been made on a North Dakota lignite. A very wide range of char reactivities was obtained by varying pyrolysis conditions and pretreatment of the lignite. For the predominantly uncatalyzed gasification reaction, carbon active site concentration was shown to be a meaningful reactivity index for demineralized chars and for carbons of varying crystallinity. For raw lignite chars, it was shown that CaO is the predominant catalytic species responsible for their high gasification reactivities. Lignite char gasification should be regarded as a catalyzed gas-solid reaction with the catalyst dispersion being the relevant reactivity parameter. When rates are expressed as turnover frequencies, observed reactivity differences of as much as 200-fold are reduced to within one order of magnitude. The commonly observed phenomenon of coal char deactivation with increasing pyrolysis severity was correlated with decreases in carbon active surface area and catalyst dispersion.

UR - http://www.scopus.com/inward/record.url?scp=0022308122&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022308122&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0022308122

SN - 0865871272

SP - 439

EP - 450

BT - Unknown Host Publication Title

PB - Government Inst Inc

ER -

Radovic LR, Walker PL, Jenkins RG. ROLES OF CATALYSIS AND CARBON ACTIVE SITES IN THE GASIFICATION OF LIGNITE CHARS. In Unknown Host Publication Title. Government Inst Inc. 1985. p. 439-450