Different Routes to the Pore Engineering of Spherical MCM-41

摘要

Different routes, including the replacements of the template, addition of pore expander and hydrothermal post- synthesis treatment have been used for the pore engineering of spherical MCM- 41. A comparison among the pore engineering effects of these methods has been made. The results show that the hydrothermal post-synthesis treatment affords the synthesized material with a larger pore size and narrow pore size distribution without changing the spherical morphology. As far as the pore-size expansion is concerned, the addition of DMTA is the most effective one, but this might be limited by the spherical morphology. Combining the replacement of C_(16) TMABr with the Gemini surfactant GEM 16-8- 16 with an addition of DMTA gives rise to the largest pore volume and surface area.