Abstract
SAPO-18, which has a microporous framework structure related to, but crystallographically distinct from, that of the solid acid catalyst SAPO-34, was synthesized hydrothermally from a silicoaluminophosphate gel containing N,N-diisopropylethylamine as a structuredirecting template. Although both materials have similar Si/(Si + Al + P) ratios, the content of Brønsted acid sites in SAPO-18 is considerably less than that in SAPO-34. As catalysts for methanol conversion to light olefins, SAPO-18 and SAPO-34 have closely similar initial activity and selectivity, but the lifetime of SAPO-18 is distinctly superior to that of SAPO-34.
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Chen, J., Thomas, J.M., Wright, P.A. et al. Silicoaluminophosphate number eighteen (SAPO-18): a new microporous solid acid catalyst. Catal Lett 28, 241–248 (1994). https://doi.org/10.1007/BF00806053
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DOI: https://doi.org/10.1007/BF00806053