Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/101510
Type: Artigo de evento
Title: Spectroscopic And Catalytic Studies On Cu-mcm-22: Effect Of Copper Loading
Author: Mascarenhas A.J.S.
Pastore H.O.
Andrade H.M.C.
Frache A.
Cadoni M.
Marchese L.
Abstract: Copper exchanged MCM-22 zeolites with varying copper contents were prepared, characterized and tested in the nitrous oxide decomposition. Over-exchanged samples showed high activity, comparable to very active Cu-ZSM-5 catalysts. The nature of the copper species was investigated by TPR - H2, FTIR - CO and FTIR - NO, evidencing at least three different species: exchanged Cu2+ ions, cationic oligomeric species and oxidic phases. Upon NO adsorption, mononitrosilic complexes CuI - (NO) were formed, and completely oxidized to CuII - (NO) with increasing NO pressure. Nitrate complexes were extensively formed by reaction with the oxidic phases in the sample with 183% cation exchange level.
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Rights: fechado
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0036934406&partnerID=40&md5=5464bfd8847cef90bcd4324488429614
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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