학술논문
Characterization of cationic pillared layer clays
Document Type
Original Paper
Author
Source
Reaction Kinetics and Catalysis Letters. July 1998 64(2):317-323
Subject
Language
English
ISSN
0133-1736
1588-2837
1588-2837
Abstract
Na-montmorillonite and its Al-, Ti-, Fe-, Cr-, Zr- and Sn-pillared derivatives (pillared layer clays) were prepared and characterized by instrumental methods and a chemical reaction. Structural characterization involved X-ray fluorescence (XRF) analysis, X-ray diffractometry (XRD),29 Si and27 Al MAS NMR spectroscopies, thermogravimetric (TG) and BET measurements. By the distinctly characteristic shapes of the d001 vs. temperature curves two groups could be distinguished, (i) Al-PILC, Ti-PILC, Cr-PILC, Zr-PILC and (ii) Fe-PILC, Sn-PILC, Na-montmorillonite. On montmorillonite isomerization of cyclopropane only occurred while oligomerization followed isomerization over Al-PILC. This latter reaction was attributed to Lewis and (the considerably smaller number of) Brönsted acid sites whose number, strength and accessibility increased due to pillaring.