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2004
Silicon
I 0058
49- 014
The Topotactic Conversion of a Novel Layered Silicate into a New Framework
Zeolite. — A novel layered silicate (PLS-1) is synthesized by hydrothermal treatment
of a mixture of SiO2, H2O, KOH, Me4NOH, and 1,4-dioxane (autoclave, 423 K, 10 d).
The new silicate crystallizes in the monoclinic space group P21/m and adopts a structure
with shared faces of pentagonal cylinders made up of five-membered silicon rings, or
pentasil rings. Heating of PSL-1 above 673 K gives a new framework zeolite (CDS-1)
with a cylindrically double saw edged structure as a result of dehydration—condensation between the pentasil layers. CDS-1 crystallizes in the orthorhombic space group
Pnma. It is expected to find wide application as a catalyst, adsorbent, separator, or ion
exchanger for various industrial uses. — (IKEDA*, T.; AKIYAMA, Y.; OUMI, Y.;
KAWAI, A.; MIZUKAMI, F.; Angew. Chem., Int. Ed. 43 (2004) 37, 4892-4896; Lab.
Membr. Chem., Natl. Inst. Adv. Ind. Sci. Technol., Japan Sci. Technol Corp., Miyagino,
Sendai 983, Japan; Eng.) — W. Pewestorf
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