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A new mechanism about the process of preparing nanoporous silica with activated carbon mold

2005; Elsevier BV; Volume: 121; Issue: 3 Linguagem: Inglês

10.1016/j.mseb.2005.04.008

1873-4944

Qun Xu, Kunlun Ding, Liumin He, Jianbo Li, Yiqun Guo, Haijuan Fan,

Catalysis and Oxidation Reactions

Abstract Supercritical fluids can be used to proceed nanoscale casting, during which silica precursor dissolved in supercritical CO 2 and the supercritical CO 2 was in contact with the active carbon templates. After removal of active carbon templates by calcinations, microporous and mesoporous silica samples replicating not only mesostructures, but also macroscopic of active carbon molds were obtained and the product have better porous capacity and specific surface area. Here, we studied the influences of a variety of factors upon nanoscale casting using supercritical fluids (NC-SCF), and determined the best casting condition. Also, we compared nanoscale casting by using supercritical fluids to simple liquid casting and on the basis of these studies, a new mechanism about preparing nanoporous silica with supercritical CO 2 -assisted method and with simple liquid casting was proposed.