Deviation from Arrhenius behaviour of rate of intercage diffusion in Zeolite Y<sup>1</sup>

Santikary, Prakriteswar; Yashonath, S.

doi:10.1002/ejtc.15

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…It can be found that the activation energy at high temperature is higher than that at a low one. This phenomenon was also found in Xe diffusion in zeolite Y …”

Section: Resultssupporting

confidence: 64%

Effect of Li Doping on Diffusion and Separation of Hydrogen and Methane in Covalent Organic Frameworks

Yang

Cao

2012

J. Phys. Chem. C

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We systematically investigate the diffusion and separation behavior of hydrogen and methane in covalent organic frameworks (COFs) and Li-doped counterparts. The results indicate that the self-diffusivities of hydrogen and methane in COFs decrease monotonically with the increase of pressure. Interestingly, after Li doping into COFs, the selfdiffusivities first increase at low pressure, and then reach a plateau, and finally decrease slightly at high pressure. This phenomenon stems from the fact that the Li atom has a strong affinity to the gas molecules. In addition, it is also found that the COFs show a larger self-diffusivity than most of the metal− organic frameworks (MOFs), and the permselectivities of the COFs for H 2 /CH 4 are 1 order of magnitude higher than the Lidoped COFs. In particular, the adsorption selectivity of Li-doped COFs for CH 4 /H 2 gets a significant improvement, compared to undoped ones. To further understand the effect of Li doping on diffusion and separation of gases, the isosurface and the contour plots of the center of mass and radial distribution functions of gases are also explored. In short, the Li doping into COFs can increase the adsorption selectivity of COF materials significantly, while for a kinetic separation process, the undoped COF-based membranes might be a very promising material.

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“…It can be found that the activation energy at high temperature is higher than that at a low one. This phenomenon was also found in Xe diffusion in zeolite Y …”

Section: Resultssupporting

confidence: 64%

Effect of Li Doping on Diffusion and Separation of Hydrogen and Methane in Covalent Organic Frameworks

Yang

Cao

2012

J. Phys. Chem. C

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Diffusion of confined fluids in microporous zeolites and clay materials

Mitra¹,

Sharma²,

Mukhopadhyay³

2021

Rep. Prog. Phys.

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Fluids exhibit remarkable variation in their structural and dynamic properties when they are confined at the nanoscopic scale. Various factors, including geometric restriction, the size and shape of the guest molecules, the topology of the host, and guest–host interactions, are responsible for the alterations in these properties. Due to their porous structures, aluminosilicates provide a suitable host system for studying the diffusion of sorbates in confinement. Zeolites and clays are two classes of the aluminosilicate family, comprising very ordered porous or layered structures. Zeolitic materials are important due to their high catalytic activity and molecular sieving properties. Guest molecules adsorbed by zeolites display many interesting features including unidimensional diffusion, non-isotropic rotation, preferred orientation and levitation effects, depending on the guest and host characteristics. These are useful for the separation of hydrocarbons which commonly exist as mixtures in nature. Similarly, clay materials have found application in catalysis, desalination, enhanced oil recovery, and isolation barriers used in radioactive waste disposal. It has been shown that the bonding interactions, level of hydration, interlayer spacing, and number of charge-balancing cations are the important factors that determine the nature of diffusion of water molecules in clays. Here, we present a review of the current status of the diffusion mechanisms of various adsorbed species in different microporous zeolites and clays, as investigated using quasielastic neutron scattering and classical molecular dynamics simulation techniques. It is impossible to write an exhaustive review of the subject matter, as it has been explored over several decades and involves many research topics. However, an effort is made to cover the relevant issues specific to the dynamics of different molecules in microporous zeolites and clay materials and to highlight a variety of interesting features that are important for both practical applications and fundamental aspects.

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Deviation from Arrhenius behaviour of rate of intercage diffusion in Zeolite Y¹

Cited by 2 publications

References 8 publications

Effect of Li Doping on Diffusion and Separation of Hydrogen and Methane in Covalent Organic Frameworks

Effect of Li Doping on Diffusion and Separation of Hydrogen and Methane in Covalent Organic Frameworks

Diffusion of confined fluids in microporous zeolites and clay materials

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Deviation from Arrhenius behaviour of rate of intercage diffusion in Zeolite Y1

Cited by 2 publications

References 8 publications

Effect of Li Doping on Diffusion and Separation of Hydrogen and Methane in Covalent Organic Frameworks

Effect of Li Doping on Diffusion and Separation of Hydrogen and Methane in Covalent Organic Frameworks

Diffusion of confined fluids in microporous zeolites and clay materials

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Product

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Deviation from Arrhenius behaviour of rate of intercage diffusion in Zeolite Y¹