Kim, SJ Kim, EJ Kang, TB Jung, KD Joo, OS Shin, CH 2024-01-21T03:43:59Z 2024-01-21T03:43:59Z 2021-09-01 2006-01 1380-2224 https://pubs.kist.re.kr/handle/201004/135873 Metal oxide (Ti, Fe, Zr)-pillared porous materials with various surface areas have been synthesized by the intercalation of metal organic between the layers of layered silicate ilerite. The surface areas of metal oxide-pillared ilerite materials depended significantly on pillaring time and the type and amount of pillaring metal oxide. The surface areas of Ti-, Fe- and Zr-ilerite materials were in the range of 152-338, 150-290 and 147-245 m(2)/g, respectively, depending on the pillaring condition. The results from X-ray diffraction and N-2 adsorption-desorption isotherms demonstrated that metal oxide-pillared ilerite materials possessed different pore structures from silica-pillared ilerite materials, due to the different nature of metal oxide and silica pillars. The gallery heights of Ti-, Fe- and Zr-ilerite materials were in the range of 3.55-4.05, 2.55-3.65 and 3.25-3.95 nm, respectively, which are 1-2 nm larger than that of silica-pillared ilerite materials. In addition, metal oxide-pillared ilerite materials exhibited the pore size distributions of mesoporosity. In the case of the metal oxide-pillared ilerite materials with homogeneous pore structures, the average pore diameters were in the range of about 2-5 nm, depending on the type of pillared metal oxide. Ti-ilerite materials exhibited relatively narrow range of pore size distribution. On the other hand, Fe-ilerite materials exhibited broad range of pore size distribution. The results from NH3-TPD and IR measurements revealed that the metal oxide pillaring into the interlayers of ilerite produced acid sites and new hydroxyl groups. Zr-ilerite materials possessed a broad range of acid sites from weak to medium acidity, whereas Ti-ilerite and Fe-ilerite materials had only weak acid sites. English SPRINGER PHASE BECKMANN REARRANGEMENT CYCLOHEXANONE OXIME MAGADIITE CATALYSTS CLAYS INTERCALATION DERIVATIVES KENYAITE Synthesis and characterization of transition metal oxide-pillared materials with mesoporosity from layered silicate ilerite Article 10.1007/s10934-006-5487-1 1 JOURNAL OF POROUS MATERIALS, v.13, no.1, pp.27 - 35 JOURNAL OF POROUS MATERIALS 13 1 27 35 scie scopus 000235808000004 2-s2.0-33644698677 Chemistry, Applied Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article PHASE BECKMANN REARRANGEMENT CYCLOHEXANONE OXIME MAGADIITE CATALYSTS CLAYS INTERCALATION DERIVATIVES KENYAITE pillared material metal oxide pillaring mesoporosity layered silicate ilerite