PREPARATION OF SILICA-PILLARED MOLECULAR-SIEVE - EFFECTS OF CATALYSTS ON GELATION OF INTERCALATED SI(OC2H5)(4)

The effects of acid and base catalysts on hydrolysis and condensation polymerization of intercalated TEOS (Si(OC2H5)(4)) in H-magadiite were investigated, It was found that the acid- or base-catalyzed reaction of TEOS in the layered silicate gallery could affect the surface area and pore size distribution, The samples silica-pillared by acid- and base-catalyzed reactions show a large increase in basal spacing of 33.3 and 39.2 Angstrom, respectively. Also, they exhibit relatively narrow pore size distributions in the range of 30-40 Angstrom and show high surface areas in the range of 648-845 m(2)/g. These results indicate that the variations in the conditions of gelation contribute to improvement in physical properties (surface area, pore size distribution, etc.) of silica-pillared molecular sieves. (C) 1995 Academic Press, Inc.