Evaluation of metal oxide phase assembling mode inside the nanotubular pores of mesostructured silica

Preparation, Characterization and Catalytic Activity of Palladium Nanoparticles Encapsulated in SBA-15

“…5A) showed maxima at 3.6-3.8 nm, which was quite different from that for SBA-15 alone and for the 0.41 wt% Pd/SBA-15-imp. The same phenomenon was also reported for the SBA-15-encapsulated ZrO 2 nanoparticles [27], and it was proposed that, in this case, it was inappropriate to use the desorption branch of the isotherms to calculate the pore size distribution [28]. Instead, the calculation using the adsorption branch of isotherms could give more reasonable results [27].…”

How nitric oxide affects the decomposition of supported nickel nitrate to arrive at highly dispersed catalysts

“…This feature is referred to as cavitation and associated with ink-bottle type pores [50]. The appearance of cavitation upon introduction of a guest phase [33,51] or plugs [52] to SBA-15 has been previously reported. Quantification (Table 2) showed that 74% of the mesopore volume (V meso,bl ) was blocked by the rodlike NiO particles.…”

Syntheses, Li Insertion, and Photoactivity of Mesoporous Crystalline TiO2

“…It is believed that the long TiÀOÀTi chains in titanium oxynitrate, which is the hydrolysate of titanium nitrate by partially losing HNO 3 during drying and thermal treatment, ensures a high loading of the precursor to form large TiO 2 crystals inside the SBA-15 pores instead of forming separated nanocrystallites or a layer of TiO 2 on the inner walls of silica. [30] On the contrary, the hydrolysate of titanium chloride without such long TiÀOÀTi chains leads to nanoparticle formation inside the silica pores. Anatase TiO 2 can also be prepared at 600 8C by using a TIP or Ti(SO 4 ) 2 solution as the precursor, where these products are all nonporous congregations of nanoparticles.…”