In situ PFG NMR study of intracrystalline diffusion during ethene conversion in ZSM-5

R. Q. Snurr; A. Hagen; H. Ernst; H. B. Schwarz; S. Ernst; J. Weitkamp; J. Kärger

doi:10.1006/jcat.1996.0312

In situ PFG NMR study of intracrystalline diffusion during ethene conversion in ZSM-5

R. Q. Snurr, A. Hagen, H. Ernst, H. B. Schwarz, S. Ernst, J. Weitkamp, J. Kärger^*

^*Corresponding author for this work

Chemical and Biological Engineering

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Abstract

Pulsed field gradient (PFG) NMR spectroscopy has been applied to measure the self-diffusivity of an inert probe species in situ during a zeolite-catalyzed reaction. Specifically, ¹⁹F PFG NMR was used to measure CF₄ intracrystalline mobility during ethene conversion in H-ZSM-5 as a function of reaction time in sealed glass samples. CF₄ was shown to be a suitable probe species, and its mobility was seen to be sensitive to changes in the composition of the reacting system with time for the conversion of ethene in H-ZSM-5. Also, the self-diffusivity of CF₄ in well-defined nonreacting mixtures could be correlated with the mobility and changing composition of the reacting system. Studies of the reaction kinetics were performed by ¹³C MAS NMR and with a recirculation reactor. At low temperatures (approx. 373 K) ethene is converted mainly to paraffins. The gas-phase products observed in the recirculation system ranged from C₂ to C₇ alkanes.

Original language	English (US)
Article number	0312
Pages (from-to)	130-137
Number of pages	8
Journal	Journal of Catalysis
Volume	163
Issue number	1
DOIs	https://doi.org/10.1006/jcat.1996.0312
State	Published - 1996

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

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title = "In situ PFG NMR study of intracrystalline diffusion during ethene conversion in ZSM-5",

abstract = "Pulsed field gradient (PFG) NMR spectroscopy has been applied to measure the self-diffusivity of an inert probe species in situ during a zeolite-catalyzed reaction. Specifically, 19F PFG NMR was used to measure CF4 intracrystalline mobility during ethene conversion in H-ZSM-5 as a function of reaction time in sealed glass samples. CF4 was shown to be a suitable probe species, and its mobility was seen to be sensitive to changes in the composition of the reacting system with time for the conversion of ethene in H-ZSM-5. Also, the self-diffusivity of CF4 in well-defined nonreacting mixtures could be correlated with the mobility and changing composition of the reacting system. Studies of the reaction kinetics were performed by 13C MAS NMR and with a recirculation reactor. At low temperatures (approx. 373 K) ethene is converted mainly to paraffins. The gas-phase products observed in the recirculation system ranged from C2 to C7 alkanes.",

author = "Snurr, {R. Q.} and A. Hagen and H. Ernst and Schwarz, {H. B.} and S. Ernst and J. Weitkamp and J. K{\"a}rger",

note = "Funding Information: The Alexander von Humboldt Foundation is gratefully acknowledged for a research fellowship to RQS. The authors also acknowledge financial support from the Bundesministerium f{\"u}r Bildung, Wissenschaft, Forschung und Technologie (BMBF) under Grant 03D0003, the Deutsche Forschungsgemeinschaft (SFB 294), Fonds der Chemischen Industrie, and the Max Buchner-Forschungsstiftung. The authors also thank G. Seiffert (Leipzig) for technical assistance and Dr. S. Rock for providing zeolite sample H-ZSM-5 (III).",

year = "1996",

doi = "10.1006/jcat.1996.0312",

language = "English (US)",

volume = "163",

pages = "130--137",

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T1 - In situ PFG NMR study of intracrystalline diffusion during ethene conversion in ZSM-5

AU - Snurr, R. Q.

AU - Hagen, A.

AU - Ernst, H.

AU - Schwarz, H. B.

AU - Ernst, S.

AU - Weitkamp, J.

AU - Kärger, J.

N1 - Funding Information: The Alexander von Humboldt Foundation is gratefully acknowledged for a research fellowship to RQS. The authors also acknowledge financial support from the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF) under Grant 03D0003, the Deutsche Forschungsgemeinschaft (SFB 294), Fonds der Chemischen Industrie, and the Max Buchner-Forschungsstiftung. The authors also thank G. Seiffert (Leipzig) for technical assistance and Dr. S. Rock for providing zeolite sample H-ZSM-5 (III).

PY - 1996

Y1 - 1996

N2 - Pulsed field gradient (PFG) NMR spectroscopy has been applied to measure the self-diffusivity of an inert probe species in situ during a zeolite-catalyzed reaction. Specifically, 19F PFG NMR was used to measure CF4 intracrystalline mobility during ethene conversion in H-ZSM-5 as a function of reaction time in sealed glass samples. CF4 was shown to be a suitable probe species, and its mobility was seen to be sensitive to changes in the composition of the reacting system with time for the conversion of ethene in H-ZSM-5. Also, the self-diffusivity of CF4 in well-defined nonreacting mixtures could be correlated with the mobility and changing composition of the reacting system. Studies of the reaction kinetics were performed by 13C MAS NMR and with a recirculation reactor. At low temperatures (approx. 373 K) ethene is converted mainly to paraffins. The gas-phase products observed in the recirculation system ranged from C2 to C7 alkanes.

AB - Pulsed field gradient (PFG) NMR spectroscopy has been applied to measure the self-diffusivity of an inert probe species in situ during a zeolite-catalyzed reaction. Specifically, 19F PFG NMR was used to measure CF4 intracrystalline mobility during ethene conversion in H-ZSM-5 as a function of reaction time in sealed glass samples. CF4 was shown to be a suitable probe species, and its mobility was seen to be sensitive to changes in the composition of the reacting system with time for the conversion of ethene in H-ZSM-5. Also, the self-diffusivity of CF4 in well-defined nonreacting mixtures could be correlated with the mobility and changing composition of the reacting system. Studies of the reaction kinetics were performed by 13C MAS NMR and with a recirculation reactor. At low temperatures (approx. 373 K) ethene is converted mainly to paraffins. The gas-phase products observed in the recirculation system ranged from C2 to C7 alkanes.

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In situ PFG NMR study of intracrystalline diffusion during ethene conversion in ZSM-5

Abstract

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