Sorption and Isomerization of Normal Olefins on Cross-Linked and Simply Exchanged Montmorillonites

Stul, Michel; Leemput, L. Van; Uytterhoeven, Jan B.

doi:10.1346/ccmn.1983.0310212

Cited by 4 publications

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“…The present paper deals with the structural characteristics of mixed Dabco ~+-and Dabco2+-inorganic cation (mostly Na +) systems on a series of smectites with different charge density to gain more information on the nature of the segregation and its relation to specific surface area. From these results suitable samples were selected for the study of the sorption behavior of normal olefins (see Stul et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Smectites Exchanged with Mono- and Biprotonated 1,4-Diazobicyclo(2,2,2)-Octane

Leemput¹

1983

Clays and clay miner.

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Abstraet--Smectites exchanged to various degrees with mono-or biprotonated 1,4-diazobicyclo(2,2,2)-octane (Dabco) have a porous structure in which the organic molecule acts as a "pillar." Less Dabco z+ than Dabco '+ was necessary both to initiate and to complete expansion, whereas for both Dabco 1+ and Dabco 2+ the threshold for expansion increased with the charge density of the clay. Interstratification of 9.7-/~ and 14.5-/~ (Dabco 1+) or 14. l-/~ (Dabco 2+) layers was observed before full expansion occurred.Nitrogen sorption isotherms on partially exchanged Dabco '+-and Dabco~+-clays are of the BET II and Langmuir type respectively, whereas n-butane adsorbed according to BET type II for both cationic forms. The specific surface area was governed by the number of Dabco z+ pillars, irrespective of the inorganic cation, and increased with Dabco z+ content even beyond the composition where full expansion was reached and notwithstanding the increasing number of silicate layers in the c direction of the crystal units. This relationship is explained by an enhanced random interleaving of clay platelets in the stacking units conraining Dabco z+.

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Section: Introductionmentioning

confidence: 99%