TY - JOUR
T1 - Catalytic activity and activation mechanism of potassium carbonate supported on perovskite oxide for coal char combustion
AU - Kim, Young Kwang
AU - Hao, Li Fang
AU - Park, Joo Il
AU - Miyawaki, Jin
AU - Mochida, Isao
AU - Yoon, Seong Ho
N1 - Funding Information:
This work was carried out under the frameworks of the projects of the high performance coal gasification project for the next generation. The authors give their great thanks to JCOAL and NEDO for their financial supports. The authors are also much appreciate for the financial support from GCOE of Kyushu University.
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/4
Y1 - 2012/4
N2 - High activity catalyst system of K 2CO 3 supported on perovskite and its reaction mechanism for carbon materials were studied. It showed higher catalytic activity at lower temperature region than the case using γ-alumina supporter or K 2CO 3 alone. And also, the catalyst supported perovskites showed one third smaller of catalyst loss after the reaction than that with the alumina supporter or K 2CO 3 alone. Catalytic activation of K 2CO 3 supported LaMn 1-xCu xO 3 system was considered to be progress by two factors. First, K 2CO 3 has to be decomposed into K + and CO32- ions. Second, decomposed K + ions are activated with oxygen at the lower temperature than K 2CO 3 activation temperature. On oxide surface of support, K 2CO 3 was found to exist in partially dissociated form. In addition, perovskites had the active oxygen at the surface. K + ions were able to be activated with the active oxygen on the surface of perovskites at the low temperature. The releasing temperature of the active oxygen could be controlled by Cu substitution in LaMn 1-xCu xO 3 system. Using these properties, we synthesized a high activity K 2CO 3 supported on perovskite catalyst for carbon combustion. Oxygen contents of perovskite could be reduced easily. And also, the reduced state could be re-oxidized to the original oxygen level. This reversible property of oxygen contents of perovskites was considered to be the reason of high recovery of catalyst (K +).
AB - High activity catalyst system of K 2CO 3 supported on perovskite and its reaction mechanism for carbon materials were studied. It showed higher catalytic activity at lower temperature region than the case using γ-alumina supporter or K 2CO 3 alone. And also, the catalyst supported perovskites showed one third smaller of catalyst loss after the reaction than that with the alumina supporter or K 2CO 3 alone. Catalytic activation of K 2CO 3 supported LaMn 1-xCu xO 3 system was considered to be progress by two factors. First, K 2CO 3 has to be decomposed into K + and CO32- ions. Second, decomposed K + ions are activated with oxygen at the lower temperature than K 2CO 3 activation temperature. On oxide surface of support, K 2CO 3 was found to exist in partially dissociated form. In addition, perovskites had the active oxygen at the surface. K + ions were able to be activated with the active oxygen on the surface of perovskites at the low temperature. The releasing temperature of the active oxygen could be controlled by Cu substitution in LaMn 1-xCu xO 3 system. Using these properties, we synthesized a high activity K 2CO 3 supported on perovskite catalyst for carbon combustion. Oxygen contents of perovskite could be reduced easily. And also, the reduced state could be re-oxidized to the original oxygen level. This reversible property of oxygen contents of perovskites was considered to be the reason of high recovery of catalyst (K +).
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U2 - 10.1016/j.fuel.2011.10.017
DO - 10.1016/j.fuel.2011.10.017
M3 - Article
AN - SCOPUS:84856739016
VL - 94
SP - 516
EP - 522
JO - Fuel
JF - Fuel
SN - 0016-2361
ER -