Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/93282
Type: Artigo de evento
Title: Cu-mcm-22 Zeolite: A Combined X-ray Powder Diffraction And Computational Study Of The Local Structure Of Extra-framework Copper Ions
Author: Milanesio M.
Croce G.
Frache A.
Mascarenhas A.J.S.
Oliveira E.C.
Abstract: Local structure and site distribution of extra-framework copper ions in Cu-exchanged MCM-22 zeolite have been determined by synchrotron radiation X-ray powder diffraction analysis combined with ab-initio molecular orbital (DFT) calculations. Three Cu sites (SI, SuII and S III) in 6-membered rings and one site (SVI) in a 5-membered ring close to the inter lamellar region, were located inside the MCM-22 supercage, whereas no Cu ions were found within the sinusoidal channels. The existence of two families of Cu sites (in 5- and 6-membered rings respectively) with different steric hindrance and adsorptive capacity, as indicated by previous FTIR study of adsorbed NO [A. Frache, et al., Langmuir, 18 (2002) 6875], was fully confirmed in this study. © 2005 Elsevier B. V. All rights reserved.
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Rights: fechado
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-21244503161&partnerID=40&md5=2cd3e1f40e81f026cc8885940fa05bc9
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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