When commercially available silica gel (SiO2) and in-house synthesized SBA-15 mesoporous silica were taken as catalyst supports for the same oxidation reaction for same metal loading, both have shown different activity. As both have meso range pores, both have high surface area, both have good thermal stability. However, SBA-15 supported catalyst has higher catalytic activity than SiO2 supported catalyst (same metal species) for the same reaction. Which property/structural geometry takes part during the reaction due to which this difference is coming out ?????
Sio2 donot has any porous ,but SBA has a mesoporose and if you functionalize the surface and poros of it can be more usful for diffrent organic reactions.
I agree totally with the answer of Morjgan Zendehdel. SBA-15 is a mesoporous material and silica gel SiO2 is not porous. So their application as catalysts in organic reactions give a different catalytic activities.
Hello Dr Vasu Chaudhary
As previously Nibou and Mojgan said, SiO2 is just not porous while SBA-15 have a very different geometry that include, hexagonal porous and well arrangement structure. You can verify this fact using XRD pattern where any diffraction peak will be observed in SiO2 while in the case of SBA-15 it will be show three characteristics peaks at low-angle XRD pattern.
Differences on the catalytic activity (e.g.: oxidation) could be associated to the dispersion of these metal species (what type of preparation methodology did you use??) and also to crystallite syze and also to surface area, pore volume . There are a lot of factor and differences that could affect and difference both materials.
With kind regards,
Julián Sánchez.
I have searched various vendors, but they show silica gel are of two types porous and non porous and sba15 is type of mesoporous silica gel. It is of high quality because of same pore size distribution and very high surface area.
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