Synthesis, Characterization Of Hierarchical Porous Materials

Porous materials with high surface areas and pore volumes have achieved great development and have been widely used in the fields of energy storage, separation, catalysis, and so on. However, the applications of porous materials are sometimes significantly influenced by their sole porosity and complex and costly synthesis. It is highly desirable to develop facile routes to hierarchical porous materials, combining advantages of multi-porosity. The hierarchical porous structure with high diffusion, surface area, and pore volume will lead to their high accessibility and high storage capacity in many possible applications. The present project is trying to choose the proper inorganic precursor, mesoporous template and synthesis temperature. The aims of the present project are to develop facile, low cost and efficient routes to novel hierarchical porous materials.Zeolites with micropores have been widely used in industry as heterogeneous catalysts, in particular as solid acid catalysts in the fields of oil refining and petrochemistry. However, relatively small and sole micropores in zeolites strongly influence the mass transport to and from the active sites located in micropores, which severely limit the performance of industrial catalysts. Mesoporous material can be used for larger molecule catalysis for its larger pore diameter, however the relatively low thermal and hydrothermal stability of ordered mesoporous materials become the main bottle-neck for the widely accepting of them as industry catalyst. So one work that can synthesize hierarchical pore materials will be very significant because it will overcome the disadvantages of both microporous and mesoporous materials. We demonstrate here a unique, facile, controllable, and universal route for the synthesis of hierarchical mesoporous zeolites templated from cationic polymer and sodium alginate. Obviously, the synthesis of hierarchical mesoporous zeolites is easily controlled. The template we used here are cheap and easily achieved. We choose the microporous zeolite Y as the matrix. After one-pot hydrothermal treatment and high temperature calcination, we achieved the hierarchical porous materials successfully. Nanostructures in nanotechnology have received enormous interest for their fascinating physical properties and numerous potential applications. It is highly desirable and challenging to achieve mesostructured silica nanotube less than 100 nm through a facile route for their fascinating properties from nanosize. Herein, we report one-pot hydrothermal route to mesostructured silica nanotubes from the assembly of CNT, CTAB, and silica gel, followed by the calcination. The synthetic procedure is simple and the obtained silica nanotubes show small tube diameters, uniformed mesopores. Besides, mesostructured silica coated CNT composite is obtained by removal of CTAB. As the materials we got are typical nanostructures so they have potential applications in catalysis, optics ,separations and so on.