Acid SAPO-34 catalysts for oxidative dehydrogenation of ethane

L. Marchese, A. Frache, G. Gatti, S. Coluccia, L. Lisi, G. Ruoppolo, G. Russo, H. O. Pastore

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

Acid SAPO-34-based microporous catalysts with chabasite structure have been tested for the oxidative dehydrogenation of ethane in the temperature range 550-700°C. Pure acid and La/Na-containing samples were monitored and very interesting catalytic performances were achieved at 550-700°C (75-60% C2H4 selectivity and 5-30% ethane conversion) with respect to those reported for both acid zeolites and metal oxides. These performances correlated to the Brønsted acidity probed by FTIR spectroscopy and temperature-programmed desorption of NH3. The number of Brønsted acid sites located at the bridging hydroxyls (3626-3600 cm−1) in acidic SAPO-34 was higher than in La- and Na-containing samples, which showed also a larger amount of P-OH at framework defects. Lewis acidity induced by the presence of La and Na ions also influenced the reactivity of the SAPO-34-based catalysts.

Lingua originaleInglese
pagine (da-a)479-484
Numero di pagine6
RivistaJournal of Catalysis
Volume208
Numero di pubblicazione2
DOI
Stato di pubblicazionePubblicato - 2002

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