Cation Size Effects in Swelling of the Layered Zeolite Precursor MCM-22-P

• Autorzy: Roth W.
• Języki publikacji: EN

Abstrakty

EN

The chemistry and apparent cation size effects associated with swelling of the layered precursor of zeolite MCM-22 are discussed in detail and rationalized. The swelling is achieved with a custom made solution, hexadecyltrimethylammonium hydroxide (CTMA-OH) due to combination of high pH and adsorption of the cation on the surface. Alternative swelling mixtures comprising surfactant chloride (CTMA-Cl) and another base, i.e. Na or tetraalkylammonium hydroxide (alkyl = methyl, ethyl, propyl) have been tried. Swelling occurred only with the tetrapropylammonium base indicating competition between CTMAand the accompanying cation. Tetrapropylammonium cation (TPA) size appeared greater (i.e. ~ 9 in diameter) than the spacing between silanol groups (8.2 ) on the surface, which made it less effective in competition with the surfactant cations for electrostatic attachment to the surface.

Słowa kluczowe

EN

layered zeolite precursor; MCM-22; swelling; cationic surfactant

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2006
• Tom: Vol. 80, nr 5
• Strony: 703--708
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Roth W.

• ExxonMobil Research and Engineering, 1545 Route 22 East, Annandale, NJ 08801, USA

Bibliografia

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