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Physicochemical Properties of Montmorillonite Interlayered with Cationic Oxyaluminum Pillars

Published online by Cambridge University Press:  02 April 2024

M. L. Occelli  and
R. M. Tindwa
M. L. Occelli
Affiliation:
Gulf Research & Development Company, P.O. Drawer 2038 Pittsburgh, Pennsylvania 15230
R. M. Tindwa
Affiliation:
Gulf Research & Development Company, P.O. Drawer 2038 Pittsburgh, Pennsylvania 15230
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Abstract

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By ion exchanging expandable clay minerals with large, cationic oxyaluminum polymers, “pillars” were introduced that permanently prop open the clay layers. On the basis of thermal, infrared spectroscopic, adsorption, and X-ray powder diffraction (XRD) analysis, the interlayering of commercial sodium bentonite with aluminum chlorohydroxide, [Al13O4(OH)24(H2O)12]+7, polymers appears to have produced an expanded clay with a surface area of 200–300 m2/g. The pillared product contained both Brönsted and Lewis acid sites. XRD and differential scanning calorimetry measurements indicated that the micropore structure of this interlayered clay is stable to 540°C. Between 540° and 760°C, the pillared clay collapsed with a corresponding decrease in surface area (to 55 m2/g) and catalytic cracking activity for a Kuwait gas oil having a 260°-426°C boiling range.

Резюме

Резюме

При помощи ионообменных расширяющихся глинистых минералов с большими катион-ными оксиалюминовыми полимерами были введены “столбы,” которые постоянно поддерживают открытыми глинистые слои. На основе данных по термическому и адсорбционному анализах, инфракрасной спектроскопии и порошковой рентгеновской диффракции (XRD), прослойка промышленного бентонита с хлоргидроокисей алюминия, [Аl13O4(OH)24(Н2O)12]+7, кажется, что полимеры образовали расширенную глину с площад поверхности 200–300 м2/г. “Столбовый” продукт содержал кислотные места Бренстеда и Льюиса. Измерения по ХRD и дифференциальной сканирующей калориметрии указывают, что микропористая структура прослойковой глины является стабильной до 540°С. [Е.С.]

Resümee

Resümee

Wenn expandierbare Tonminerale mit großen, kationischen Oxyaluminium-Polymeren ausgetauscht werden, werden “Pillars” eingebaut, die die Tonlagen permanent aufspreizen. Aufgrund thermischer und infrarotspektroskopischer, Adsorptions- und Röntgenpulverdiffraktions (XRD)-Analysen scheint die Wechsellagerung von käuflichem Na-Bentonit mit Aluminiumchlorohydroxid, [Al13O4(OH)24(H2O)12]+7, -Polymeren zur Bildung eines expandierbaren Tons zu führen, der eine Oberfläche von 200 - 300 m2/g hat. Das “Pillar”-Produkt enthielt sowohl Brönsted- als auch Lewis-Säureplätze. XRD- und differentialkalorimetrische Messungen deuteten darauf hin, daß die Struktur der Mikroporen dieser Wechsellagerungstone bis 540°C stabil ist. Zwischen 540° und 760°C brach der “Pillar”-Ton zusammen, was zu einer entsprechenden Abnahme der Oberfläche (auf 55 m2/g) führt und zu einer Abnahme der Fähigkeit zum katalytisch-en Cracken von Gasöl aus Kuwait, das einen Siedebereich zwischen 260° und 420°C hat. [U.W.]

Résumé

Résumé

Par l’échange d'ions entre des minéraux argileux expansibles et de larges polymères cationiques oxyaluminium, des “pilliers” ont été introduits qui maintiennent ouverts de manière permanente les couches argileuses. Basé sur des analyses thermiques, de spectroscopie infrarouge, d'adsorption, et de diffraction de rayons-X (XRD), le placement en couches alternatives de bentonite de sodium commerciale et de polymères chlorohydroxide d'aluminium, [Al13O4(OH)24(H2O)12]+7, semble avoir produit une argile dilatée ayant une aire de surface égale à 200–300 m2/g. Le produit à pilliers contenait à la fois des sites acides Brönsted et Lewis. Des mesures XRD et de calorimétrie differentielle ont indiqué que la structure micropore de cette argile à couches alternatives est stable jusqu'a 540°C. Entre 540° et 760°C, l'argile à pilliers s'est effondrée entraînant une diminution correspondante de l'aire de surface (à 55 m2/g) et une activité catalytique/cra-quante pour un petrole à essence du Kuwait ayant une étendue de températures d’ ébullition de 260°-426°C. [D.J.]

Keywords

CatalysisInterlayeringMolecular sieveMontmorilloniteOxyaluminumPillar
Type
Research Article
Information
Clays and Clay Minerals , Volume 31 , Issue 1 , February 1983 , pp. 22 - 28
Copyright
Copyright © 1983, The Clay Minerals Society

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