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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 5
BKCSDE 25(5)
May 20, 2004 

Microwave Synthesis of Titanium Silicalite-1 Using Solid Phase Precursors
K. Y. Kim, W. S. Ahn*, D. W. Park, J. H. Oh, C. M. Lee, W. P. Tai
TS-1, SiO2-TiO2 xerogel, Thermal plasma, Ti-HMS, Microwave heating
Titanium silicalite-1 (TS-1) molecular sieve was produced by microwave heating of amorphous titaniumcontaining solid precursors after impregnation with aqueous TPAOH solution. SiO2-TiO2 xerogel, sub-micron sized SiO2-TiO2 prepared by thermal plasma process, and Ti-containing mesoporous silica, Ti-HMS, were tested as the solid phase substrates. Highly crystalline product was obtained within 30 min. after microwave irradiation with yields over 90% using SiO2-TiO2 xerogel, which showed essentially identical physicochemical properties to TS-1 prepared by conventional hydrothermal method. Excellent catalytic activity was also obtained for 1-hexene epoxidation using H2O2. SiO2-TiO2 particles prepared by thermal plasma and Ti-HMS were found inferior as a substrate for TS-1, probably due to difficulties in wetting the surface uniformly with TPAOH.
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