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Title: Chemical looping coal gasification with calcium ferrite and barium ferrite via solid--solid reactions

Coal gasification to produce synthesis gas by chemical looping was investigated with two oxygen carriers, barium ferrite (BaFe2O4) and calcium ferrite (CaFe2O4). Thermo-gravimetric analysis (TGA) and fixed-bed flow reactor data indicated that a solid–solid interaction occurred between oxygen carriers and coal to produce synthesis gas. Both thermodynamic analysis and experimental data indicated that BaFe2O4 and CaFe2O4 have high reactivity with coal but have a low reactivity with synthesis gas, which makes them very attractive for the coal gasification process. Adding steam increased the production of hydrogen (H2) and carbon monoxide (CO), but carbon dioxide (CO2) remained low because these oxygen carriers have minimal reactivity with H2 and CO. Therefore, the combined steam–oxygen carrier produced the highest quantity of synthesis gas. It appeared that neither the water–gas shift reaction nor the water splitting reaction promoted additional H2 formation with the oxygen carriers when steam was present. Wyodak coal, which is a sub-bituminous coal, had the best gasification yield with oxygen carrier–steam while Illinois #6 coal had the lowest. The rate of gasification and selectivity for synthesis gas production was significantly higher when these oxygen carriers were present during steam gasification of coal. The rates and synthesis gas yields during the temperaturemore » ramps of coal–steam with oxygen carriers were better than with gaseous oxygen.« less
 [1] ;  [2] ;  [3] ;  [1]
  1. U.S. Department of Energy/NETL
  2. Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
  3. West Virginia Univ., Morgantown, WV (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0306-2619
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Energy; Journal Volume: 165
Research Org:
National Energy Technology Laboratory - In-house Research
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
01 COAL, LIGNITE, AND PEAT Chemical looping coal gasification; oxygen carriers for coal gasification; steam gasification of coal with oxygen carriers