DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Ihm, Son-Ki | - |
dc.contributor.advisor | 임선기 | - |
dc.contributor.author | Suh, Myung-Ji | - |
dc.contributor.author | 서명지 | - |
dc.date.accessioned | 2011-12-13T01:55:41Z | - |
dc.date.available | 2011-12-13T01:55:41Z | - |
dc.date.issued | 2007 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=268831&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/29941 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2007. 8, [ vi, 72 p. ] | - |
dc.description.abstract | Perovskite-type oxide LaCoO_{3} as a substitute of noble metal catalysts has high potential for their use in various oxidations. There are some classical methods commonly used for the synthesis of perovskite-type oxide such as solid-state method and co-precipitation method, etc. These methods require high calcination temperature (>900℃) for forming perovskite structure and hence yield perovskite-type oxides with low surface area (<2 m^{2}/g) due to sintering. A new synthesis route combining the citrate sol-gel method and the mesoporous silicas (MCM-41 and MCM-48) as templates was investigated to produce ultrafine LaCoO_{3}. Ultrafine LaCoO3 obtained by the new synthesis method was characterized with XRD, N2-adsorption/desorption, and EDX, configuring the single crystallite structures of perovskite. Ultrafine LaCoO_{3} obtained by silica templates removal showed the crystallite size of 18nm and the surface area of 140 m^{2}/g. The small crystallite size was caused by forming the perovskite-type oxides of La and Co precursors inside mesopores of silica template. The ultrafine LaCoO_{3} was applied as a catalyst for total oxidation of toluene. Catalytic performance of ultrafine LaCoO_{3} was compared with those of traditional LaCoO_{3} (by co-precipitation or citric acid method) and LaCoO_{3} with silica templates. The ultrafine LaCoO_{3} catalyst was the most active due to remarkably high surface area(140 m^{2}/g). The ultrafine LaCoO_{3} catalyst by the new synthesis route has improved surface area and catalytic activity compared with traditional LaCoO_{3}. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | perovskite | - |
dc.subject | catalyst | - |
dc.subject | mesoporous | - |
dc.subject | template | - |
dc.subject | toluene | - |
dc.subject | 페롭스카이트 | - |
dc.subject | 촉매 | - |
dc.subject | 메조기공 | - |
dc.subject | 주형 | - |
dc.subject | 톨루엔 | - |
dc.subject | perovskite | - |
dc.subject | catalyst | - |
dc.subject | mesoporous | - |
dc.subject | template | - |
dc.subject | toluene | - |
dc.subject | 페롭스카이트 | - |
dc.subject | 촉매 | - |
dc.subject | 메조기공 | - |
dc.subject | 주형 | - |
dc.subject | 톨루엔 | - |
dc.title | A study on synthesis of ultrafine perovskite-type oxide catalyst LaCoO_{3} via mesoporous silica templating | - |
dc.title.alternative | 메조포러스 실리카를 주형으로 이용한 페롭스카이트형 산화물 촉매 LaCoO_{3}의 미세입자 합성에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 268831/325007 | - |
dc.description.department | 한국과학기술원 : 생명화학공학과, | - |
dc.identifier.uid | 020053870 | - |
dc.contributor.localauthor | Ihm, Son-Ki | - |
dc.contributor.localauthor | 임선기 | - |
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