title: Air oxidation effects on microporosity, surface property, and CH4 adsorptivity of pitch-based activated carbon fibers.
abstract: The changes in microporous structure and surface properties of pitch-based activated carbon fibers upon air oxidation were examined by high-resolution N2 adsorption and various physicochemical methods such as DTA, DRIFT, XPS, and chemical titration/analysis. It was found that air oxidation below 673 K slightly modifies the microporous structure together with a minor replacement of surface -C=O groups by -C-O groups. However, oxidation above 773 K gradually increases the specific surface area and the average width of micropores by producing micropores with larger widths and greatly induces the formation of surface functional groups, especially the -COOH group. A slight change in microporosities has an evident effect on CH4 storage property.
authors.affiliation: Aquamaterial Separation Technology RG, Marine Resource and Environment Institute, National Institute of Advanced Industrial Science and Technology, 2217-14 Hayashi-cho, Takamatsu-shi, Kagawa 761-0395, Japan. zm-wang@aist.go.jp
authors.forename: Z-M
authors.initials: ZM
authors.lastname: Wang
authors.forename: N
authors.initials: N
authors.lastname: Yamashita
authors.forename: Z-X
authors.initials: ZX
authors.lastname: Wang
authors.forename: K
authors.initials: K
authors.lastname: Hoshinoo
authors.forename: H
authors.initials: H
authors.lastname: Kanoh