Synthesis of alumina-pillared fluorine micas using poly(vinyl alcohol) as a template and their porous characteristics

Synthesis of alumina pillared fluorine micas has been undertaken using synt hetic high layer-charged expandable fluorine mica and hydroxoaluminum solut ions loadings under the presence of poly(vinyl alcohol) (PVA) to obtain mic roporous solids having high thermal durability. The basal spacings and surf ace areas of the products depend on the solution loading. The optimal solut ion loading in this study was 24 mmol Al/g mica. The products thus obtained gave the large basal spacing of 2.7 nm at 500 degreesC and the maximum sur face area of 403 m(2) g(-1) at 600 degreesC. The surface area of the produc t was above 300 m(2) g(-1) after heating at 800 degreesC, showing high ther mal durability. Pore size distribution of the products proved of micropore of micropores. Sintered bodies of the alumina-pillared micas were obtained by firing at 500-700 degreesC using pressed compacts of the pillared micas. They were machinable and retained porous characteristics.