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Metallic iron: potential to function as tar breakdown catalyst in waste gasification
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 43 p.
Series
Trita-KET, ISSN 1104-3466 ; 224
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:kth:diva-574OAI: oai:DiVA.org:kth-574DiVA: diva2:14478
Supervisors
Note
QC 20101217Available from: 2005-12-27 Created: 2005-12-27 Last updated: 2010-12-17Bibliographically approved
List of papers
1. Elemental iron as a tar breakdown catalyst in conjunction with atmospheric fluidized bed gasification of biomass: A thermodynamic study
Open this publication in new window or tab >>Elemental iron as a tar breakdown catalyst in conjunction with atmospheric fluidized bed gasification of biomass: A thermodynamic study
2006 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 20, no 3, 890-895 p.Article in journal (Refereed) Published
Abstract [en]

Metallic iron as a catalyst for tar cracking in biomass gasification has been investigated. Based on previous studies showing that iron must be in its elemental form to catalyze the tar breakdown reactions, thermodynamic calculations suggest the existence of an operating window where iron is neither oxidized nor contaminated by carbon deposits. A straightforward biomass gasification model has been derived and used in conjunction with thermodynamics for making plots that illustrate the mentioned operating window, which is achievable under real conditions. Experiments made under these specific calculated conditions confirm that elemental iron effectively acts as a tar breakdown catalyst, resulting in an improved gas yield and a decrease in tar concentration. The desired operating window is governed mainly by adjusting the oxygen input (i.e., the equivalence ratio) and the temperature.

National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:kth:diva-15674 (URN)10.1021/ef0502195 (DOI)000237576500003 ()2-s2.0-33745612953 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-04-28Bibliographically approved
2. Metallic iron as a tar breakdown catalyst related to atmospheric, fluidised bed gasification of biomass
Open this publication in new window or tab >>Metallic iron as a tar breakdown catalyst related to atmospheric, fluidised bed gasification of biomass
2006 (English)In: Fuel, ISSN 0016-2361, Vol. 85, no 06-maj, 689-694 p.Article in journal (Refereed) Published
Abstract [en]

Tar formation is a major drawback when biomass is converted in a gasifier to obtain gas aimed for utilisation in power production plants or for production of chemicals. Catalytic cracking is an efficient method to diminish the tar content in the gas mixture. In this study, the capability of metallic iron and iron oxides to catalytically crack tars has been experimentally examined. To obtain metallic iron, small grains of hematite (Fe2O3) were placed in a secondary reactor downstream the gasifier and reduced in situ prior to catalytic operation. The fuel used in the atmospheric fluidised bed gasifier was Swedish birch with a moisture content of approximately 7 wt%. The influence of temperature in the range 700-900 degrees C and), values (i.e. equivalence ratio, ER) between 0 and 0.20 have been investigated. In essence, the results show that raising the temperature in the catalytic bed to approximately 900 degrees C yields almost 100% tar breakdown. Moreover, increasing the). value also improves the overall tar cracking activity. The iron oxides did not demonstrate any catalytic activity.

Keyword
biomass gasification, catalytic tar reduction, metallic iron
National Category
Chemical Process Engineering
Identifiers
urn:nbn:se:kth:diva-15383 (URN)10.1016/j.fuel.2005.08.026 (DOI)000234764900013 ()2-s2.0-28244433478 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-04-28Bibliographically approved

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