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S. Martinez, M. Moreno-Manas, A. Vallribera, U. Schubert, A. Roig, E. Molins:
"Highly dispersed nickel and palladium nanoparticle silica aerogels: sol-gel processing of tethered metal complexes and application as catalysts in the Mizoroki-Heck reaction";
New Journal of Chemistry, 30 (2006), 1093 - 1097.

Highly dispersed Ni and Pd silica aerogels were prepared through sol-gel processes. They have been synthesized by tethering the metal to the silica matrix with the use of the complexing silanes AEAPTS [N-(aminoethyl)aminopropyl]trimethoxysilane or TRIAMIN [N-((aminoethyl)aminoethyl)aminopropyl]trimethoxysilane. The gels were dried with scCO₂ to afford the aerogels. High metal dispersion and small particle sizes were observed through HRTEM and XRD measurements. The organic groups were removed by oxidation and/or pyrolysis. The Pd reduced aerogels containing 15-17% of palladium are good recoverable catalysts in the Mizoroki-Heck reaction.