抄録
Metal (Ti, Fe) containing porous materials with different surface areas have been synthesized by pillaring metal oxide between the layers of layered silicate ilerite. The BET surface areas of metal-pillared ilerite (Me-ilerite) materials were different with pillaring methods, pillaring time, and the types and amounts of metal precursors. The Me-ilerite materials of relatively large surface areas were obtained when metal precursor itself without dissolving it in octylamine was added directly to octylammonium-ilerite gel. The surface areas of Me-ilerite materials increased with pillaring time. In case of Fe pillaring, however, the surface areas decreased after some pillaring time, due to pore blocking by iron oxides formed from hydrolysis of Fe precursor in the octylammonium-ilerite gel. Also, the surface areas of Me-ilerite materials were different with the type and amount of metal precursor, due to different nature between metal precursors. Ti-ilerite materials showed higher surface areas than Fe-ilerite materials. Ti-ilerite and Fe-ilerite materials exhibited the maximum surface areas at about 15 and 20wt% of Ti and Fe precursors, respectively. The surface areas of Ti-ilerite and Fe-ilerite materials were in the range of 150-340 m2/g and 150-290 m2/g, respectively, which are much higher than that of H-ilerite used as a host, 20 m2/g. The X-ray diffraction showed that the basal spacings of Me-ilerite materials were significantly expanded by metal pillaring into the layers of ilerite. The basal spacings of Ti-ilerite and Fe-ilerite materials were in the range of 4.3-4.8 nm and 3.3-4.5 nm, respectively, which are much larger than 0.75 nm of H-ilerite. The results from the surface areas and X-ray diffraction suggested that a pillared structure with porosity should be formed between the layers of ilerite by metal oxide pillaring.
