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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.
Rights: fechado
Identifier DOI: 
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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