Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Synthesis and Spectroscopic Characterization of Vanadium-Incorporated V-AlMCM-48 Mesoporous Material

바나듐이 들어있는 Mesoporous V-AlMCM-48 분자체의 합성 및 분광학적 특성 조사

  • Back, Gernho (Department of Chemistry, Changwon National University) ;
  • Yu, Jong-Sung (Department of Chemistry, Hannam University) ;
  • Park, Sung-Kun (Department of Chemistry, Changwon National University) ;
  • Lee, Chul Wee (Advanced Chemical Technology Division, KRICT) ;
  • Won, Taejin (Department of Chemistry, Changwon National University)
  • Received : 2006.06.16
  • Accepted : 2006.07.25
  • Published : 2006.08.31
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Abstract

A solid-state reaction of $V_2O_5$ with AlMCM-48 followed by calcination generated very weak paramagnetic $VO^{2+}$ species in the mesoporous material. Dehydration and subsequent reduction with CO result in the formation of vanadyl $VO^{2+}$ species that can be characterized by EPR. The chemical environment of vanadium centers in $VO^{2+}-AlMCM-48$ was investigated by XRD, EDX, DR-UV-Vis, EPR,$^{29}Si$ and $^{27}Al$ and $^{51}V$ NMR. Vanadium species in MCM-48 are existed as pseudotetrahedral $VO^{2+}$ state when they were dehydrated or reduced with CO. The coordination of water on vanadyl ions transformed their structure to distorted octahedral.

$V_2O_5$와 AlMCM-48을 고체상에서 반응시킨 후 소성하면 메조포러스 물질 내에서 V(V) 화학종이 아주 약하게 나타난다. 그러나 환원 과정을 거치면 EPR로 조사할 수 있는 바나딜 $VO^{2+}$ 화학종이 생성된다. $VO^{2+}-AlMCM-48$에 들어있는 바나듐의 화학적 환경을 XRD, EDX, UV-Vis, EPR, $^{29}Si$ and $^{27}Al$ and $^{51}V$ NMR로 조사하였다. 탈수하거나 CO 로 환원하면 바나듐은 MCM-48에 유사 사면체형 $VO^{2+}$ 바나딜 이온 상태로 존재하며 물이 배위되면 찌그러진 팔면체구조로 바뀐다.

Keywords

Acknowledgement

Supported by : 창원대학교

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