Accessibility of Co3O4 particles patterned in SBA-15

摘要: Abstract Crystalline Co 3 O 4 nanoparticles were patterned in the pores of SBA-15 silicas using “two solvents” technique (Co/Si atomic ratios between 0.10 and 0.35, pore sizes: 5.1, 5.6 7.3 nm). Normalized surface areas, calculated from N 2 sorption experiments, reveal a partial plugging which, for given Co/Si ratio, increases when size decreases. The CO oxidation catalytic reactivity particles either embedded or extracted silica confirms that are partially accessible to reagents. Despite accessibility limitations, compares favorably with very few data available literature. Unexpectedly low activation energies even measured. Finally, H -TPR experiments limitations correlated formation hardly reducible silicate species.