The diffusion of benzene in high silica zeolite ZSM5 studied by PFGNMR and QUENS

Mark Morgan; Terence Cosgrove; Robert Richardson

doi:10.1016/0166-6622(89)80239-2

The diffusion of benzene in high silica zeolite ZSM5 studied by PFGNMR and QUENS

Mark Morgan, Terence Cosgrove^*, Robert Richardson

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

The diffusion of benzene in the high silica zeolite ZSM5 has been studied at various coverages by pulsed field gradient nuclear magnetic resonance (PFGNMR) and quasi-elastic neutron scattering (QUENS). The PFGNMR technique has probed inter- and intra-crystalline diffusion over the millisecond timescale giving intra coefficients of the order 10^-10 m² s^-1 and inter coefficients in the range from 10^-7 to 10^-9 m² s^-1 with increasing coverage. This suggests a 'viscous' liquid-like environment inside the zeolite but rather faster diffusion between crystallites. QUENS has probed intra-crystalline diffusion on the nanosecond timescale giving results in the range 10^-10 to 10^-9 m² s^-1 at high coverages. A jump activation energy for this process of 5.0 ± 0.4 kJ mol^-1 has been estimated over the temperature range of 213 to 343 K.

Original language	English
Pages (from-to)	209-219
Number of pages	11
Journal	Colloids and Surfaces
Volume	36
Issue number	2
DOIs	https://doi.org/10.1016/0166-6622(89)80239-2
Publication status	Published - 1 Jan 1989

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title = "The diffusion of benzene in high silica zeolite ZSM5 studied by PFGNMR and QUENS",

abstract = "The diffusion of benzene in the high silica zeolite ZSM5 has been studied at various coverages by pulsed field gradient nuclear magnetic resonance (PFGNMR) and quasi-elastic neutron scattering (QUENS). The PFGNMR technique has probed inter- and intra-crystalline diffusion over the millisecond timescale giving intra coefficients of the order 10-10 m2 s-1 and inter coefficients in the range from 10-7 to 10-9 m2 s-1 with increasing coverage. This suggests a 'viscous' liquid-like environment inside the zeolite but rather faster diffusion between crystallites. QUENS has probed intra-crystalline diffusion on the nanosecond timescale giving results in the range 10-10 to 10-9 m2 s-1 at high coverages. A jump activation energy for this process of 5.0 ± 0.4 kJ mol-1 has been estimated over the temperature range of 213 to 343 K.",

author = "Mark Morgan and Terence Cosgrove and Robert Richardson",

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T1 - The diffusion of benzene in high silica zeolite ZSM5 studied by PFGNMR and QUENS

AU - Morgan, Mark

AU - Cosgrove, Terence

AU - Richardson, Robert

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Y1 - 1989/1/1

N2 - The diffusion of benzene in the high silica zeolite ZSM5 has been studied at various coverages by pulsed field gradient nuclear magnetic resonance (PFGNMR) and quasi-elastic neutron scattering (QUENS). The PFGNMR technique has probed inter- and intra-crystalline diffusion over the millisecond timescale giving intra coefficients of the order 10-10 m2 s-1 and inter coefficients in the range from 10-7 to 10-9 m2 s-1 with increasing coverage. This suggests a 'viscous' liquid-like environment inside the zeolite but rather faster diffusion between crystallites. QUENS has probed intra-crystalline diffusion on the nanosecond timescale giving results in the range 10-10 to 10-9 m2 s-1 at high coverages. A jump activation energy for this process of 5.0 ± 0.4 kJ mol-1 has been estimated over the temperature range of 213 to 343 K.

AB - The diffusion of benzene in the high silica zeolite ZSM5 has been studied at various coverages by pulsed field gradient nuclear magnetic resonance (PFGNMR) and quasi-elastic neutron scattering (QUENS). The PFGNMR technique has probed inter- and intra-crystalline diffusion over the millisecond timescale giving intra coefficients of the order 10-10 m2 s-1 and inter coefficients in the range from 10-7 to 10-9 m2 s-1 with increasing coverage. This suggests a 'viscous' liquid-like environment inside the zeolite but rather faster diffusion between crystallites. QUENS has probed intra-crystalline diffusion on the nanosecond timescale giving results in the range 10-10 to 10-9 m2 s-1 at high coverages. A jump activation energy for this process of 5.0 ± 0.4 kJ mol-1 has been estimated over the temperature range of 213 to 343 K.

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DO - 10.1016/0166-6622(89)80239-2

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EP - 219

JO - Colloids and Surfaces

JF - Colloids and Surfaces

IS - 2

ER -

The diffusion of benzene in high silica zeolite ZSM5 studied by PFGNMR and QUENS

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