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Silica gel has a large specific surface area and a suitable pore structure, which is suitable for a variety of catalytic reactions. Its main functions include dispersing the active components, improving the stability of the catalyst, and enhancing the catalytic efficiency. These effects are achieved by providing an effective surface and a suitable pore structure, increasing the specific surface area of the catalyst, and improving heat resistance and mechanical strength, thereby affecting the efficiency and selectivity of the catalytic reaction.
There are many types of catalyst carriers, but silica gel, as one of them, has unique and irreplaceable advantages. First of all, the chemical properties of silicone are stable and it is not easy to react with other chemicals. Secondly, silica gel is a kind of porous synthetic silica dioxide, which can produce products of different structures through process control. The pore volume, specific surface, and pore size can all be adjusted according to the needs of the catalyst. Moreover, silica gel can be processed into different particle forms and particle sizes such as powder, spherical, and amorphous.
The sol-to-gel method is the main process for preparing carrier silica gel. The effects of one sol-to-gel and multiple sol-to-gel processes on the surface morphology, pore structure, and catalyst properties of carrier silica gel are investigated.
(1) The morphology of silica gel prepared by the sol-gel process multiple times will produce irregularities, and there will be a certain amount of fine cracks; the surface of silica gel prepared by the sol-gel process at a time is more dense and smooth. (2) The interior of the silica gel prepared by the multiple sol-gel process is mainly mesoporous, followed by micropores, and there are fewer macropores, which increases the specific surface area of the silica gel and the proportion of diffusion pores; while the interior of the silica gel prepared by the one-sol-gel process is mainly mesoporous, with micropores and mesopores.less. (3) The catalyst activity of the silica gel-loaded catalyst prepared by the multiple sol-gel process is slightly higher, the polymer morphology produced is better, and the bulk density is slightly higher.
