Silica aerogel from TEOS

Haereid, S., Dahle, M., Lima, S., and Einarsrud, M.-A. (1995) Preparation and properties of monolithic silica aerogels from TEOS-based alcogels aged in silane solutions./. Non-Cryst Solids, 186, 96-103. 

The classical Ti-Si02 catalyst was initially prepared from TiCh and pyrogenic Si02 in 1969 [52]. Almost 30 years later, Maier et al. [53] synthesized calcinated xerogels via a sol-gel process with TEOS and various Ti-cyclopentadienyl complexes (entry 1, Table 5.3). In 1995, Baiker [54] demonstrated that sol-gel prepared titania-silica mixed aerogels showed better catalytic behavior in epoxidation of different bulky olefins than Ti zeolites [55] and silica supported titania described at that time [56]. The most common oxidant was cumene peroxide. The drying method, the titanium content and the calcination temperature were the most important parameters. Aerogels dried by semicontinuous extraction with supercritical CO2 at low temperature were found to be more efficient (entry 2, Table 5.3). In 2001 Baiker described the preparation of a series of titania-silica mixed... 

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