1996 Fiscal Year Final Research Report Summary
Preparation of Molecular Sieving Activated Carbon Fiber from Pitch-Based Carbon Fiber
| Project/Area Number |
07555244
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
反応・分離工学
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| Research Institution | Okayama University |
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Principal Investigator |
SAKATA Yusaku Okayama University, Department of Applied Chemicatry, Professor, 工学部, 教授 (70032951)
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| Co-Investigator(Kenkyū-buntansha) |
NISHINO Hiroshi Osaka Gas Co.Ltd., Research and Development Section, Consultant (Researcher), 開発研究所, 顧問(研究職)
UDDIN Md.Azhar Okayama University, Graduate School of Natural Science, Research Associate, 大学院自然科学研究科, 助手 (70263613)
MUTO Akinori Okayama University, Department of Applied Chemistry, Lecturer, 工学部, 講師 (00174243)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Carbon Fiber / Actived Carbon Fiber / High Surface Area Carbon / Adsorption Capacity / Molecular Sieving Adsorption / Pore Size Distribution / 吸着速度 |
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| Research Abstract |
The purpose of this work is to develop a process for the preparation of porous activated carbon fiber (ACF) with uniform pore size using petroleum-pitch-based carbon fiber as a precursor. It became clear that the narrow diameter (ca.16 mu m) of the raw material carbon fibers is one of the main factors preventing the application of existing carbon activation techniques to the production of activated carbon. In concrete, we were able to show that in order to freely control and design the pore structure uniformly whilst meeting the antagonistic requirements of both increasing the surface area and maintaining a high yield, it is necessary to : (1) select an activation gas that has an oxidizing ability which can be controlled with ease (carbon dioxide) ; (2) reduce the oxygen content of the activation gas to less than approx. 1 ppm ; (3) maintain a uniform temperature distribution in the furnace during activation treatment.
The relationship between the specific surface area and the yield of porous activated carbon fiber was studied over a wide range of treatment time at predetermined temperatures (850,900,950 ﾟC). As a result, we were able to prepare a series of activated carbon samples with molecular sieving function differing from each other only in their pore size and were able to evaluate the pore structures and adsorption properties thus :
1) ACF with a high surface area (2800 m^2/g) and a yield of 42% was obtained.
2) Capacity and rate of gas phase adsorption of hydrocarbons (methane, ethylene, n-butane, iso-butane etc.) were measured and the character of the pore structures was investigated.
3) Adsorption capacity and adsorption rate of chloroform and humic acid in aqueous phase were determined.
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