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|Type:||Artigo de evento|
|Title:||Spectroscopic And Catalytic Studies On Cu-mcm-22: Effect Of Copper Loading|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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