Characterization of the extra-large-pore zeolite UTD-1

Raul F. Lobo, Michael Tsapatsis, Clemens C. Freyhardt, Shervin Khodabandeh, Paul Wagner, Cong Yan Chen, Kenneth J. Balkus, Stacey I. Zones, Mark E. Davis

Research output: Contribution to journalArticlepeer-review

140 Scopus citations

Abstract

The molecular sieve UTD-1 is investigated using scanning and transmission electron microscopies (TEM), solid-state NMR spectroscopy, electron (ED) and X-ray diffraction (XRD), adsorption studies, and catalytic test reactions. The results confirm that UTD-1 is the first high-silica zeolite to contain a one;dimensional, extra-large 14-ring pore system. TEM and ED show that UTD-1 is faulted along the (002) planes. Simulations of XRD patterns of faulted structures using DIFFaX indicate that the XRD pattern of a framework containing the so-called double crankshaft chains is in better agreement with the experimental pattern than a framework with the narsarsukite chains previously reported. Thermal/hydrothermal stability studies show that UTD-1 has similar stability to other medium- and large-pore, high-silica zeolites. The ratio of isomerization to disproportionation, and the distribution of trimethylbenzene isomers in the m-xylene isomerization test reaction from UTD-1 are similar to those obtained from other large-pore zeolites (zeolites Y or L). However, UTD-1 shows a p-/o-xylene ratio of products below one.

Original languageEnglish (US)
Pages (from-to)8474-8484
Number of pages11
JournalJournal of the American Chemical Society
Volume119
Issue number36
DOIs
StatePublished - Sep 10 1997

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