TY - JOUR
T1 - A TPD study of coal chars in relation to the catalysis of mineral matter
AU - Kyotani, Takashi
AU - Karasawa, Shinji
AU - Tomita, Akira
N1 - Funding Information:
The authors wish to thank Mr S. Hayashi for his technical assistance.T his work was supported in part by a Grant-in-Aid for Energy Research from the Ministry of Education, Japan.
PY - 1986/10
Y1 - 1986/10
N2 - The steam gasification mechanism of brown coal was studied by a temperature-programmed desorption (TPD)technique. A Morwell coal was devolatilized in N2 and then gasified in steam at 1100 K. During the TPD of a partially gasified char, H2O, CO2 and CO evolved approximately at 640, 870 and 1020 K, respectively. The presence of mineral matter was found to be responsible for these gas evolutions, since essentially no gas evolution was observed during the TPD of the demineralized coal char. The comparison of the above TPD pattern with those determined for the cation-exchanged samples revealed which inorganic species is responsible for each TPD peak: H2O evolution was due to Ca; CO2 evolution to Ca and Mg; CO evolution to Na and/or Fe. The exchanged metal species like Ca and Na significantly catalysed the gasification reaction. The relation between the catalytic activity and TPD pattern was discussed in terms of surface oxygen complexes.
AB - The steam gasification mechanism of brown coal was studied by a temperature-programmed desorption (TPD)technique. A Morwell coal was devolatilized in N2 and then gasified in steam at 1100 K. During the TPD of a partially gasified char, H2O, CO2 and CO evolved approximately at 640, 870 and 1020 K, respectively. The presence of mineral matter was found to be responsible for these gas evolutions, since essentially no gas evolution was observed during the TPD of the demineralized coal char. The comparison of the above TPD pattern with those determined for the cation-exchanged samples revealed which inorganic species is responsible for each TPD peak: H2O evolution was due to Ca; CO2 evolution to Ca and Mg; CO evolution to Na and/or Fe. The exchanged metal species like Ca and Na significantly catalysed the gasification reaction. The relation between the catalytic activity and TPD pattern was discussed in terms of surface oxygen complexes.
KW - catalysis
KW - gasification of coal
KW - mineral matter
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U2 - 10.1016/0016-2361(86)90125-0
DO - 10.1016/0016-2361(86)90125-0
M3 - Article
AN - SCOPUS:0022790268
VL - 65
SP - 1466
EP - 1469
JO - Fuel
JF - Fuel
SN - 0016-2361
IS - 10
ER -