Delamination of lamellar phyllosilicate Magadiite

Abstract

66-4 FIELD Section Title:Surface Chemistry and Colloids Research Institute of Petroleum Processing, SINOPEC, Beijing, Peop. Rep. China. FIELD URL: written in EnglishIn this paper, a new delaminated mesoporous material was prepd. by swelling the lamellar phyllosilicate Magadiite using cetyltrimethylammonium bromide and tetrapropylammonium hydroxide soln., followed by delamination under the cavitation of ultrasonic treatment. Various characterization tools including XRD, N2 adsorption, NMR, IR, SEM and TEM were employed to observe its structure and morphol. XRD results show that the delaminated material has no long-range cryst. order. Furthermore, not only high surface area is obtained, but almost half of it is external surface. The observation for the morphol. further reveals that it is made up of the random stacking of single or few layers. All these characters show that this delaminated mesoporous material meets the requirements for application as support in the hydrotreatment of heavy mols. [on SciFinder(R)

Reactivity and applications of layered silicates and layered double hydroxides

“…47 Despite these limitations, the delamination/exfoliation of magadiite has been sufficiently studied for its potential benefits in the preparation of hybrid organic-inorganic nanocomposites 109 and optically transparent monoliths. 110 Moreover, Bi et al have successfully obtained high surface area (microporous/mesoporous) materials [111][112][113] via an intermediate delamination of magadiite induced by an intercalation of cetyltrimethylammonium bromide (CTMABr) and tetrapropylammonium hydroxide (TPAOH), ultrasonication in water, followed by acidification, drying and calcination. Similarly, recent developments have shown that the exfoliation of layered sodium octosilicate can also be performed by intercalation of 1-butyl-3-(3-triethoxysilylpropyl)-4,5-dihydroimidazolium and didecyldimethylammonium ions, followed by an ultrasonication in water 114 and pentane, 115 respectively.…”