Synthesis of mesoporous silicon imido nitride with high surface area and narrow pore size distribution

Silicon imido nitride with a specific surface area up to 1000 m(2) g(-1) is obtained by ammonolysis of silicon tetrachloride in organic solvents and s ubsequent NH4Cl removal at elevated temperatures in a stream of anhydrous a mmonia. The material has a remarkably narrow pore size distribution and a m ean pore size of 5.7 nm. TEM investigations reveal the spherical macromorph ology and uniform dendritic mesostructure of the micrometer sized particles . A high number of Si-NH2 groups on the inner surface of the material is in dicated from IR measurements. Si-29 MAS NMR indicates the presence of SiN48 - tetrahedra.