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Interlamellar and Multilayer Nitrogen Sorption by Homoionic Montmorillonites

Published online by Cambridge University Press:  01 July 2024

M. I. Knudson Jr.  and
J. L. McAtee Jr.
M. I. Knudson Jr.*
Affiliation:
Baylor University, Department of Chemistry, Waco, Texas 76703, U.S.A.
J. L. McAtee Jr.
Affiliation:
Baylor University, Department of Chemistry, Waco, Texas 76703, U.S.A.
*
*Present address: Baroid Division, NL Industries, Inc., P.O. Box 1675, Houston, Texas 77001, U.S.A.
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Abstract

Nitrogen sorption by various homoionic montmorillonites was studied at 78°K. The adsorption isotherms in the relative pressure range P/P0= 0.05-0.25 were found to be either Type I or Type II in the BET classification. The nitrogen sorption process was considered to be predominantly interla-mellar when described by a Type I isotherm. With a Type II isotherm, the adsorption was assumed to be predominantly on those surfaces not in the interlamellar regions.

It was concluded that only cations within a certain size range promote significant interlamellar nitrogen penetration in montmorillonites. The role of the smaller cations in nitrogen sorption by montmorillonites seems to be their influence on the external aggregate structures. Very large cations tend to clog up the interlamellar pores as well as some of the external voids.

Résumé

Résumé

On a étudié la sorption d’azote à 78°K par différentes montmorillonites homoioniques. Les isothermes d’adsorption dans le domaine des pressions relatives étudiées (P/P0= 0,05-0,25) sont soit du Type I, soit du Type II selon la classification BET. Ce phénomène de sorption d’azote est considéré comme principalement interlamellaire lorsqu’il est décrit par un isotherme du Type I; avec un isotherme du Type II, on suppose que l’adsorption a lieu principalement sur les surfaces non situées dans les régions interlamellaires.

On conclut que seuls des cations d’une certaine taille permettent une pénétration interlamellaire notable de l’azote dans les montmorillonites. Le rôle des cations plus petits dans la sorption de l’azote par les montmorillonites semble consister en l’influence qu’ils ont sur la structure externe des agrégats. Les très gros cations tendent à obstruer aussi bien les pores interlamellaires que les vides externes.

Kurzreferat

Kurzreferat

Die Stickstoffsorption durch verschiedene homoionische Montmorillonite wurde bei 78°K untersucht. Die Adsorptionsisothermen im relativen Druckbereich P/P0= 0,05-0,25 entfielen entweder auf Typ I oder Typ II in der BET-Klassifikation. Der Vorgang der Stickstoffsorption wurde als vorwiegend interlamellar angenommen, wenn er sich durch eine Isotherme vom Typ I beschreiben ließ und vorwiegend an solchen Oberflächen ablaufend, die nicht im interlamellaren Bereich liegen, wenn eine Isotherme vom Typ II vorlag.

Es wurde geschlossen, daß nur Kationen in einem bestimmten Größenbereich ein signifikantes Eindringen von Stickstoff in den Zwischenschichtbereich von Montmorilloniten ermöglichen. Die Rolle kleiner Kationen bei der Stickstoffsorption von Montmorillonit scheint in ihrem Einfluß auf die äußeren Aggregatstrukturen zu liegen. Sehr große Kationen neigen dazu, sowohl unterlamellare Poren als auch einige äußere Hohlräume zu verstopfen.

Резюме

Резюме

Изучается сорбция азота различными гомоионными монтмориллонитами при 78°K. Нашли, что изотермы адсорбции в сравнительном диапазоне давления (Р/Р0 = от 0,05 до 0,25) были по классификации ВЕТ или типа I или II. В присутствии изотерма типа I процесс сорбции считается преимущественно межслойным. А изотерм типа II адсорбируется большей частью на поверхностях, а не между слоями.

В заключение решили, что только катионы в пределах определенного размера стимули-руют межслойную пенетрацию в монтмориллонитах. Роль более малых катионов на сорбцию азота монтмориллонитами, кажется, является их влияние на наружную структуру агрегата. Очень крупные катионы имеют тенденцию засаривать поры промежуточных слоев и также некоторые наружные пустые пространства.

Type
Research Article
Information
Clays and Clay Minerals , Volume 22 , Issue 1 , February 1974 , pp. 59 - 65
Copyright
Copyright © The Clay Minerals Society 1974

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