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Nano Research 2018, 11(1): 360-369 https://doi.org/10.1007/s12274-017-1638-8
Research Article | Issue | Published: 19 July 2017

The role of water in methane adsorption and diffusion within nanoporous silica investigated by hyperpolarized 129Xe and 1H PFG NMR spectroscopy

Show Author's Information Yuanli Hu1,2,  Mingrun Li1,  Guangjin Hou1,  Shutao Xu3,  Ke Gong1,2,  Xianchun Liu1,  Xiuwen Han1,  Xiulian Pan1( ),  Xinhe Bao1( )
State Key Laboratory of CatalysisDalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian116023China
National Engineering Laboratory for Methanol to OlefinsDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian116023China
University of Chinese Academy of SciencesBeijing100049China
Keywords:
water adsorption, diffusion, nanopores, hyperpolarized 129Xe, nuclear magnetic resonance
Cite this article:
Hu Y, Li M, Hou G, et al. The role of water in methane adsorption and diffusion within nanoporous silica investigated by hyperpolarized 129Xe and 1H PFG NMR spectroscopy. Nano Research, 2018, 11(1): 360-369. https://doi.org/10.1007/s12274-017-1638-8
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Abstract Full text Electronic supplementary material About this article

Understanding the properties and behavior of water molecules in restricted geometries, such as the nanopores of rocks, is of interest for shale gas exploitation. We present herein ex situ and in situ nuclear magnetic resonance (NMR) studies on the effects of water on the adsorption and diffusion of methane in nanopores. Silica materials with one-dimensional pores of ZSM-22, MCM-41, and SBA-15, with pore sizes ranging from 0.5 to 6 nm, were chosen as models. Hyperpolarized (HP) 129Xe NMR results show that water adsorption does not affect the pore sizes of ZSM-22 and MCM-41 but reduces that of SBA-15. The presence of water suppresses methane adsorption; this suppression effect is stronger in smaller pores. The self-diffusion coefficients of methane within ZSM-22 and MCM-41 are not significantly influenced by the presence of water, as measured by 1H pulsed field gradient (PFG) NMR. However, within SBA-15, which has a pore size of 6 nm, the diffusion coefficient of methane increases as the amount of water adsorption increases, peaks, and then decreases to a constant value with further water adsorption. These experiments reveal the effects of the pore size and the presence of water on methane adsorption and diffusion in constrained spaces, which could have important implications for flow simulations of methane in shales.


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About this article

The role of water in methane adsorption and diffusion within nanoporous silica investigated by hyperpolarized 129Xe and 1H PFG NMR spectroscopy

Show Author's information Yuanli Hu1,2, Mingrun Li1, Guangjin Hou1, Shutao Xu3, Ke Gong1,2, Xianchun Liu1, Xiuwen Han1, Xiulian Pan1( ), Xinhe Bao1( )
State Key Laboratory of CatalysisDalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian116023China
National Engineering Laboratory for Methanol to OlefinsDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian116023China
University of Chinese Academy of SciencesBeijing100049China

Abstract

Understanding the properties and behavior of water molecules in restricted geometries, such as the nanopores of rocks, is of interest for shale gas exploitation. We present herein ex situ and in situ nuclear magnetic resonance (NMR) studies on the effects of water on the adsorption and diffusion of methane in nanopores. Silica materials with one-dimensional pores of ZSM-22, MCM-41, and SBA-15, with pore sizes ranging from 0.5 to 6 nm, were chosen as models. Hyperpolarized (HP) 129Xe NMR results show that water adsorption does not affect the pore sizes of ZSM-22 and MCM-41 but reduces that of SBA-15. The presence of water suppresses methane adsorption; this suppression effect is stronger in smaller pores. The self-diffusion coefficients of methane within ZSM-22 and MCM-41 are not significantly influenced by the presence of water, as measured by 1H pulsed field gradient (PFG) NMR. However, within SBA-15, which has a pore size of 6 nm, the diffusion coefficient of methane increases as the amount of water adsorption increases, peaks, and then decreases to a constant value with further water adsorption. These experiments reveal the effects of the pore size and the presence of water on methane adsorption and diffusion in constrained spaces, which could have important implications for flow simulations of methane in shales.

Keywords: water adsorption, diffusion, nanopores, hyperpolarized 129Xe, nuclear magnetic resonance

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Publication history
Copyright
Acknowledgements

Publication history

Received: 22 March 2017
Revised: 17 April 2017
Accepted: 18 April 2017
Published: 19 July 2017
Issue date: January 2018

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany 2017

Acknowledgements

Acknowledgements

This work was supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences (No. XDB10020202).

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