TY - JOUR
T1 - Spectroscopic and catalytic studies on Cu-MCM-22
T2 - Effect of copper loading
AU - Mascarenhas, A. J.S.
AU - Pastore, H. O.
AU - Andrade, H. M.C.
AU - Frache, A.
AU - Cadoni, M.
AU - Marchese, L.
N1 - Funding Information:
This work was supported by the Brasilian "Fundaq~o de Amparo ~t Pesquisa do Estado de Sao Paulo" (FAPESP, grant number 99/10391-8) and by the Italian "Ministero della Ricerca Scientifica e Tecnologica" (MURST, "Progetti di Rilevante Interesse Nazionale", Cofinanziamento 2000). M.C. thanks "Associazione per lo Sviluppo Scientifico e Tecnologico del Piemonte" for a grant-in-aid.
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/0036934406
U2 - 10.1016/s0167-2991(02)80047-7
DO - 10.1016/s0167-2991(02)80047-7
M3 - Article
AN - SCOPUS:0036934406
SN - 0167-2991
VL - 142 A
SP - 343
EP - 350
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
ER -