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Received June 16, 2006
Accepted July 25, 2006
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바나듐이 들어있는 Mesoporous V-AlMCM-48 분자체의 합성 및 분광학적 특성 조사
Synthesis and Spectroscopic Characterization of Vanadium-Incorporated V-AlMCM-48 Mesoporous Material
창원대학교 화학과, 641-773 경남 창원시 사림동 9 1한남대학교 화학과, 306-791 대전시 대덕구 오정동 133 2한국화학연구원 신화학연구단, 305-600 대전시 유성구 장동 100
Department of Chemistry, Changwon National University, 9, Sarim-dong, Changwon, Kyungnam 641-773, Korea 1Department of Chemistry, Hannam University, 133, Ojeong-dong, Daedeok-gu, Daejeon 306-791, Korea 2Advanced Chemical Technology Division, KRICT, 100, Jang-dong, Yuseong-gu, Daejeon 305-600, Korea
ghbaek@changwon.ac.kr
Korean Chemical Engineering Research, August 2006, 44(4), 369-374(6), NONE Epub 6 September 2006
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Abstract
V2O5와 AlMCM-48을 고체상에서 반응시킨 후 소성하면 메조포러스 물질 내에서 V(V) 화학종이 아주 약하게 나타난다. 그러나 환원 과정을 거치면 EPR로 조사할 수 있는 바나딜 VO2+ 화학종이 생성된다. VO2+-AlMCM-48에 들어있는 바나듐의 화학적 환경을 XRD, EDX, UV-Vis, EPR, 29Si and 27Al and 51V NMR로 조사하였다. 탈수하거나 CO로 환원하면 바나듐은 MCM-48에 유사 사면체형 VO2+ 바나딜 이온 상태로 존재하며 물이 배위되면 찌그러진 팔면체 구조로 바뀐다.
A solid-state reaction of V2O5 with AlMCM-48 followed by calcination generated very weak paramagnetic VO2+ species in the mesoporous material. Dehydration and subsequent reduction with CO result in the formation of vanadyl VO2+ species that can be characterized by EPR. The chemical environment of vanadium centers in VO2+- AlMCM-48 was investigated by XRD, EDX, DR-UV-Vis, EPR, 29Si and 27Al and 51V NMR. Vanadium species in MCM-48 are existed as pseudotetrahedral VO2+ state when they were dehydrated or reduced with CO. The coordination of water on vanadyl ions transformed their structure to distorted octahedral.
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