The influence of silica mesostructure upon the Pd-catalyzed selective oxidation of allylic alcohols has been investigated for amorphous and surfactant-templated SBA-15, SBA-16, and KIT-6 silicas. Significant rate enhancements can be achieved via mesopore introduction, most notably through the use of interconnected porous silica frameworks, reflecting both improved mass transport and increased palladium dispersion; catalytic activity decreases in the order Pd/KIT-6 ≈ Pd/SBA-16 > Pd/SBA-15 > Pd/SiO2. Evidence is presented that highly dispersed palladium oxide nanoparticles, not zerovalent palladium, are the catalytically active species. © 2011 American Chemical Society.
- active site
- selective oxidation
Parlett, C. M. A., Bruce, D. W., Hondow, N. S., Lee, A. F., & Wilson, K. (2011). Support-enhanced selective aerobic alcohol oxidation over Pd/mesoporous silicas. ACS Catalysis, 1(6), 636-640. https://doi.org/10.1021/cs200145n