Isao Mochida

Pore structure analysis of activated carbon fiber by microdomain-based model

The pore structures of commercial pitch and PAN-based activated carbon fibers (ACFs) were investigated. The pore size and pore size distribution of pitch-based ACFs were measured by nitrogen adsorption isotherms and 129Xe NMR spectroscopy and compared with each other. Scanning tunneling microscopy showed that the ACFs were composed of spherical microdomain units the size of a few nanometers. The activation mechanism of ACFs was considered and explained by novel hypothesis; the concept of microdomain structure of ACFs was considered and explained to overcome limitation of the conventional fractal hypothesis. Whereas micropores were generated on each microdomain, the origin of mesopores was interdomain pores, resulting from the microdomain hypothesis.

Modern Approaches to Hydrotreating Catalysis

Hydrotreating plays an important role in petroleum refining . Crude oil contains contaminants – sulfur, nitrogen , oxygen and trace elements – which must be removed to meet product specifications. Most refineries include at least three hydrotreating units for upgrading naphtha, middle distillates , gas oils, intermediate process streams, and/or residue. Hydrotreating catalysts are the core of the process.

Molecular Alignment and Domain Assembles in the Uni-chromic Mesophase Spherules Prepared from Synthetic Naphthalene Isotropic Pitch

TitleMolecular Alignment and Domain Assembles in the Uni-chromicMesophase Spherules Prepared from Synthetic Naphthalene Isotropic PitchAuthor(s)Chang, Young-Chul; Sohn, Hun-Joon; Wang, Yong-Gang; Korai, Yozo;Nakagawa, Yoshiteru; Mochida, IsaoCitation九州大学大学院総合理工学研究科報告 ¦¦ 21(2) ¦¦ p161-165; Engineeringsciences reports, Kyushu University ¦¦ 21(2) ¦¦ p161-165Issue Date 1999-09URL http://hdl.handle.net/2324/16557Right