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 N2O decomposition shown by fresh CuZSM-5 was essentially lost after steaming, while CuAPSO-34 exhibited a significantly milder deactivation.
On the Hydrothermal Stability of CuAPSO-34 Microporous Catalysts for N2O Decomposition. A comparison with CuZSM-5 / Palella, BORIS IGOR; M., Cadoni; A., Frache; H. O., Pastore; R., Pirone; G., Russo; S. COLUCCIA AND L., Marchese. - In: JOURNAL OF CATALYSIS. - ISSN 0021-9517. - STAMPA. - 217:(2003), pp. 100-106.
On the Hydrothermal Stability of CuAPSO-34 Microporous Catalysts for N2O Decomposition. A comparison with CuZSM-5
PALELLA, BORIS IGOR;
2003
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 N2O decomposition shown by fresh CuZSM-5 was essentially lost after steaming, while CuAPSO-34 exhibited a significantly milder deactivation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
