Adsorption of Nitrogen, Oxygen and Argon in Transition and Rare Earth Ion Exchanged Zeolites a and X

Jasra, Raksh V.; Sebastian, Jince; Chudasama, Chintansinh D.

doi:10.1142/9789812704320_0058

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“…However, these techniques are expensive and cumbersome to achieve on a large scale commercially. We have demonstrated 24,27 the potential of developing molecular sieves by carrying out liquidphase deposition of silica on the external surface of zeolite A. In the present work, we have carried out silica deposition on the external surface of zeolite A by reaction of zeolite silanol groups with tetraethyl orthosilicate (TEOS) from liquid phase.…”

Section: Introductionmentioning

confidence: 97%

Pore-Size Engineering of Zeolite A for the Size/Shape Selective Molecular Separation

Chudasama

Sebastian

Jasra

2005

Ind. Eng. Chem. Res.

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The size of pore apertures of zeolite A was systematically controlled by silica deposition on the external surface of the zeolite A from a dilute solution of tetraethyl orthosilicate (TEOS) in dry toluene. The silica deposition on the external surface is confirmed by EDX analysis and external surface area measurements. The adsorption properties of these pore-size-engineered zeolites show that these adsorbents are useful for the size-selective separation of molecules of size in the range of 3−4 Å, such as N2/O2/Ar and H2O/CH3OH/C2H5OH. Argon and nitrogen molecules are restricted from entering the zeolite pores after depositing TEOS on the external surface of zeolite A, and their adsorption capacities decrease. Comparatively smaller oxygen molecules can still enter the pores and become adsorbed there. O2/N2 and O2/Ar selectivity increase with increase in the TEOS deposition. The adsorption properties of the pore-size-engineered zeolite A become similar to that of commercially available molecular sieve 3A after depositing around 0.20% TEOS on the external surface of NaA.

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Section: Introductionmentioning

confidence: 97%