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 originale | Inglese |
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pagine (da-a) | 479-484 |
Numero di pagine | 6 |
Rivista | Journal of Catalysis |
Volume | 208 |
Numero di pubblicazione | 2 |
DOI | |
Stato di pubblicazione | Pubblicato - 2002 |