The structure of the new pure silica zeolite RUB-24, Si32O64, obtained by topotactic condensation of the intercalated layer silicate RUB-18

Although the structure analysis showed that the pores of the (idealized) silica framework are empty, nitrogen sorption experiments showed that there is no “free” access to the pore volume. According to 29Si MAS NMR spectroscopy a few defects are present caused by incomplete or random condensation of the silanol groups which might block access to the pores.