Catalytic activity and activation mechanism of potassium carbonate supported on perovskite oxide for coal char combustion

Young Kwang Kim, Li Fang Hao, Joo Il Park, Jin Miyawaki, Isao Mochida, Seong Ho Yoon

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

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 +).

Original languageEnglish
Pages (from-to)516-522
Number of pages7
JournalFuel
Volume94
DOIs
Publication statusPublished - Apr 2012

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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