Abstract
The addition of solid 5/6 basic aluminum chloride salt (ACH) to a concentrated (50% w/w) acetone suspension of various dioctahedral and trioctahedral smectites, followed by washing with distilled water and centrifugation, leads to the formation of well formed pillared derivatives (PILCs). The samples were characterized by chemical analysis, X-ray diffraction, N 2 adsorption, 29Si and 27Al MAS NMR spectroscopy, and turned out to be highly microporous with micropore volumes in the range 0.10–0.12 cm 3/g, and with highly ordered clay sheets ( d 001 = 1.8 nm). The number and strength of the acid sites were estimated by analysing the product distribution of the 1-butene isomerization reaction. A mechanism of the pillaring process is proposed on the basis of MAS NMR, XRD, and N 2 adsorption data.
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