Kinetics of physical adsorption by carbonaceous adsorbents of biporous structure

Dubinin, M. M.; Erashko, I. T.; Kadlec, O.; Ulin, V. I.; Волощук, А. М.; Zolotarev, P. P.

doi:10.1016/0008-6223(75)90231-6

Cited by 89 publications

(30 citation statements)

References 10 publications

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“…Their objective was to study the individual contributions to the transport process of the macroand microporous regions in a bidisperse material. Dubinin and coworkers (Dubinin et al, 1975) developed the method further, for biporous adsorbents. Karger and coworkers (Karger et al, 1982) suggested using the temporal moments for samples of varying particle radius to identify the limiting process in the sorption kinetics.…”

Section: Temporal Momentsmentioning

confidence: 99%

Transport of n‐paraffins in zeolite T

1996

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Section: Temporal Momentsmentioning

confidence: 99%

Transport of n‐paraffins in zeolite T

1996

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“…Assuming that exchange is controlled by intercrystalline diffusion, for spherical particles the exchange rate constant can be represented by the formula [24] k, -15Dele"' (6) (R2) ,…”

Section: Xenon Exchange Between Particles Of Zeolites Nax and Naymentioning

confidence: 99%

Application of129Xe 2D-EXSY NMR to intra- and interparticle exchange in zeolites

1995

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2D-EXSY NMR methods were used to explore diffusion between different domains in zeolites on two very different length scales. Measurements were made on xenon-containing samples consisting of a mixture of NaX and NaY zeolite particles which give distinct resonance lines. The cross peaks observed were interpreted in terms of interparticle exchange, and exchange rates were measured as a function of particle size. This kind of experiment with a length scale of microns to mm should be useful in model studies of diffusion in packed catalyst beds. Measurements also were made to study exchange on a much smaller length scale between the main-channel and side-pocket sites in samples of microcrystalline Na-mordenite. Exchange rates and site occupancies were measured as a function of ternperature, yielding activation energies for xenon desorption and intersite diffusion. Also, information was obtained on the distribution of inequivalent side-pocket sites which leads to the large xenon NMR linewidths for this type of site.

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“…an extremely low value of the overall mass transfer coefficient k v in equation 1. In the earlier X-ray experiments performed by Dubinin et al (1975), this was attributed to the diffusion resistance in the adsorption pores, i.e. the micropore system, being much higher than the resistance in the transport pores (macro-and mesopore system).…”

Section: Intensity (-)mentioning

confidence: 93%

“…The very first use of X-ray imaging, in radiography mode, to study adsorption in porous materials was performed by Dubinin et al (1975). In this pioneer work, they employed X-ray contrast substances to analyse the nature of the mass transfer limiting step, i.e.…”

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confidence: 99%

Use of x-ray microtomography to visualise dynamic adsorption of organic vapour and water vapour on activated carbon

2006

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X-ray microtomography coupled with image analysis was used to quantify the adsorption of vapours on activated carbon beds. This technique was tested using three different challenges: CCl 4 , water vapour and a mixture of water-and organic vapour. It is shown that the used technique allows determining the adsorption front progress in the case of organic vapour and mixture of water and organic vapour whereas the existence of this front was not so obvious in the case of water vapour. Experimental results obtained for organic vapours were interpreted on the basis of the WheelerJonas equation: a good agreement was found between experimental and theoretical breakthrough times.

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Kinetics of physical adsorption by carbonaceous adsorbents of biporous structure

Cited by 89 publications

References 10 publications

Transport of n‐paraffins in zeolite T

Transport of n‐paraffins in zeolite T

Application of129Xe 2D-EXSY NMR to intra- and interparticle exchange in zeolites

Use of x-ray microtomography to visualise dynamic adsorption of organic vapour and water vapour on activated carbon

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