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Understanding The Brønsted Acidity of Sapo-5, Sapo-17, Sapo-18 and SAPO-34 and Their Catalytic Performance for Methanol Conversion to Hydrocarbons

1994; Elsevier BV; Linguagem: Inglês

10.1016/s0167-2991(08)63726-x

2542-6613

J. Chen, Paul A. Wright, Srinivasan Natarajan, J. M. Thomas,

Crystal Structures and Properties

SAPO-5, SAPO-17, SAPO-18 and SAPO-34 were successfully synthesised. The bridging Si-OH-Al groups (Brønsted acid sites) in these SAPOs were observed by means of diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. On the basis of temperature-programmed-desorption (TPD) of ammonia, it is inferred that the strength of the Brønsted acid sites is in the order SAPO-5<SAPO-17<SAPO-18<SAPO-34. SAPO-18 and SAPO-34, which have cages smaller than those of SAPO-5 and SAPO-17, exhibit high activity and selectivity towards light olefins for the conversion of methanol, whereas SAPO-5 has the longest life time among the SAPOs under investigation.