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

doi:10.1021/ja9708528

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

Chemical Engineering and Materials Science

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143 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 language	English (US)
Pages (from-to)	8474-8484
Number of pages	11
Journal	Journal of the American Chemical Society
Volume	119
Issue number	36
DOIs	https://doi.org/10.1021/ja9708528
State	Published - Sep 10 1997

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Characterization of the extra-large-pore zeolite UTD-1. / Lobo, Raul F.; Tsapatsis, Michael; Freyhardt, Clemens C.; Khodabandeh, Shervin; Wagner, Paul; Chen, Cong Yan; Balkus, Kenneth J.; Zones, Stacey I.; Davis, Mark E.

In: Journal of the American Chemical Society, Vol. 119, No. 36, 10.09.1997, p. 8474-8484.

Research output: Contribution to journal › Article › peer-review

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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.",

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

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AU - Lobo, Raul F.

AU - Tsapatsis, Michael

AU - Freyhardt, Clemens C.

AU - Khodabandeh, Shervin

AU - Wagner, Paul

AU - Chen, Cong Yan

AU - Balkus, Kenneth J.

AU - Zones, Stacey I.

AU - Davis, Mark E.

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N2 - 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.

AB - 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.

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

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