Papers by Author: Yoshihiro Sugi

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Authors: Yuji Haga, Pusparatu, Kiyotada Aoyama, Kenichi Komura, Yoichi Nishimura, Yoshihiro Sugi, Jong Ho Kim, Gon Seo
Authors: T. Raja, Jana Horníková, N.E. Jacob, R.K. Jha, Yuichi Kubota, Yoshihiro Sugi
Authors: Kshudiram Mantri, Ryo Nakamura, Yasuyuki Miyata, Kenichi Komura, Yoshihiro Sugi
Abstract: Some typical multi-valent metal salt hydrates, such as chloride, nitrate, sulfate, and acetate of Fe3+, Al3+, Ga3+, In3+, ZrO2+, HfO2+, Zn2+, Co2+, Ni2+, Mn3+, Cr3+, and Cu2+ have catalytic activities for the esterification of saturated and unsaturated fatty acids and alcohols. Supporting these metal salt hydrates on ordered mesoporous silica such as MCM-41 enhanced the catalytic activity of the esterification. The esters of C10-C18 normal acid and alcohol were obtained in high yield by some of supported metal salt hydrates on MCM-41; however, the yield of the esters decreased with their chain length of acids and alcohols although the activities depended on type of metal salt hydrates. The catalyst is recyclable although some loss of activity was observed.
Authors: Jun Lee, Yoshihiro Sugi, Nam Jo Jeong, Gon Seo, Sung June Cho
Abstract: High surface area and uniform nano-sized TiO2 and ZrO2 were prepared readily by the infiltration of metal alkoxides into the nanoporous SiO2, SBA-15 and the following selective dissolution of SiO2. The obtained particles of TiO2 and ZrO2, 8.1 nm were nanocrystalline of which the structure were anatase and tetragonal, respectively. The surface area and pore volume of the nanocrystalline metal oxides can be increased to above 200 m2g-1 and 0.30 cm3g-1, respectively.
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