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Type: Artigo de periódico
Title: On The Hydrothermal Stability Of Cuapso-34 Microporous Catalysts For N 2o Decomposition: A Comparison With Cuzsm-5
Author: Palella B.I.
Cadoni M.
Frache A.
Pastore H.O.
Pirone R.
Russo G.
Coluccia S.
Marchese L.
Abstract: The hydrothermal stability of CuAPSO-34 microporous silicoaluminophosphates with chabasite structures has been investigated and compared to that of a copper-exchanged ZSM-5 zeolite by a combined XRD, FTIR, and catalytic study. CuAPSO-34 showed a higher hydrothermal structural stability (steaming 80 h at 600°C), as found by XRD. Spectroscopic FTIR investigation of adsorbed CO revealed that upon this steaming procedure the concentration of monovalent copper ions in CuAPSO-34 was not significantly affected, whereas, even after a less severe steaming (60 h at 550°C), these species dramatically decreased in CuZSM-5, and extraframework Al3+ ions were simultaneously formed. Consequently, the high activity in N 2O decomposition shown by fresh CuZSM-5 was essentially lost after steaming, while CuAPSO-34 exhibited a significantly milder deactivation. © 2003 Elsevier Science (USA). All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0021-9517(03)00033-2
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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