The effect of the concentration dependence of diffusivity on zeolitic sorption curves

Garg, Deepak; Ruthven, Douglas M.

doi:10.1016/0009-2509(72)85078-4

Cited by 109 publications

(32 citation statements)

References 4 publications

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“…Also, agreement between adsorption and desorption curves can be used as a criterion. Garg and Ruthven (1972) have shown that, in a system where intracrystalline diffusion is concentration-dependent, adsorption and desorption curves will show an apparent diffusion coefficient higher than the true value. The discrepancy is stronger for the adsorption curves, and increases drastically with increasing step size.…”

Section: Results and Discussion N-heptanementioning

confidence: 93%

Transport of n‐paraffins in zeolite T

1996

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Section: Results and Discussion N-heptanementioning

confidence: 93%

Transport of n‐paraffins in zeolite T

1996

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“…The variation of the effective diffusivity D c with the adsorbed phase concentration was taken into account using the correlation established by Garg and Ruthven (1972) for a langmuirian adsorption.…”

Section: Model Simplificationmentioning

confidence: 99%

Diffusion in zeolites: is surface resistance a critical parameter?

et al. 2010

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Gravimetric uptake measurements were performed with cyclohexane for different Silicalite-1 crystals sizes. It was observed that the apparent diffusion coefficients vary with crystal size, confirming the existence of a surface resistance. Considering that surface and the intracrystalline characteristic diffusion times are additives, it was possible to dissociate the two resistances.Surface mass transfer coefficient was found to be in the same order of magnitude for the different samples and activated with temperature. The contribution of surface resistance to mass transfer limitation is lower at high temperatures and for the bigger crystals. Surface resistance is far from being negligible for the smaller crystals: for crystals of 2 µm, surface resistance represents more than 60% of the total mass transfer resistance at 398 K. And crystals of that size (in the order of 2 µm) are usually used industrially, in order to minimize mass transfer resistance.The surface of one of our sample was purified by etching with a solution of hydrogen fluoride, without any enhancement of the adsorption kinetic. Surface resistance may not be located at the extreme surface of the crystals but in a layer of non negligible thickness of distorted crystal structure around the crystals.

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“…The diffusivity at the final loading at 80 mbar is much higher than the value at the initial low pressure, so the crystal reaches equilibrium more rapidly. The large dif ference between adsorption and desorption rates measured in integral sorption measurements resulting from the con centration dependence of diffusivity has been considered in detail by Garg and Ruthven [19].…”

Section: Desorption To Vacuummentioning

confidence: 99%

Analysis of thermal effects in infrared and interference microscopy: n-Butane-5A and methanol–ferrierite systems

Heinke¹,

Chmelik²,

Kortunov³

et al. 2007

Microporous and Mesoporous Materials

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…rger, J. (2007). Analysis of thermal effects in infrared and interference microscopy: n-Butane-5A and methanol-ferrierite systems. Microporous and Mesoporous Materials, This p(lpcr is dedicated \0 lhe memory of Professor LOVUI Rees. a pionccr of zeolite research who made muny seminal contributions. most n:ccn tly wi th respect to the accurate measurement of intracrystalline diffusion by thc frcqucncy rcsponse mc thod. Hc was a good fricnd and a valued collc3guc. His percep tivc comme nts and unfailing good humour will be sorely missed.

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The effect of the concentration dependence of diffusivity on zeolitic sorption curves

Cited by 109 publications

References 4 publications

Transport of n‐paraffins in zeolite T

Transport of n‐paraffins in zeolite T

Diffusion in zeolites: is surface resistance a critical parameter?

Analysis of thermal effects in infrared and interference microscopy: n-Butane-5A and methanol–ferrierite systems

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