2000 Fiscal Year Final Research Report Summary
CONTINUOUS PRODUCTION OF HYDROGEN FROM METHANE WITHOUT CARBON DIOXIDE PRODUCTION
| Project/Area Number |
11650810
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | KAGOSHIMA UNIVERSITY |
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Principal Investigator |
KAI Takami KAGOSHIMA UNIVERSITY, FACULTY OF ENGINEERING, DEPARTMENT OF APPLIED CHEMISTRY AND CHEMICAL ENGINEERING, ASSOCIATE PROCESSOR, 工学部, 助教授 (00177312)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Takeshige KAGOSHIMA UNIVERSITY, FACULTY OF ENGINEERING, DEPARTMENT OF APPLIED CHEMISTRY AND CHEMICAL ENGINEERING, PROFESSOR, 工学部, 教授 (20041543)
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| Project Period (FY) |
1999 – 2000
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| Keywords | METHANE / HYDROGEN / CARBON DIOXIDE / FIXED BED / NICKEL / ALUMINA / SILICA / FLUIDIZED BED |
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| Research Abstract |
The production technique in which hydrogen is produced from the methane decomposition without the production of carbon dioxide was studied. Some works using fixed bed reactor have been carried out to develop catalysts. In this study, in order to produce hydrogen and carbon continuously, the fluidized bed system was studied.
Nickel catalyst supported on carriers were prepared. The reaction temperature was 500-550℃. The inner diameter of column used for a fluidized bed was 12 mm. Since the size was too small to establish the fluidizing state utilized industrially. However, the catalyst particle were moved in the reactor. The particle diameter was about 60 x 10-6 m.
Silica, alumina and active charcoal were used as a catalyst supports. The highest reaction rate was obtained for silica supported catalyst. The deposition of carbon per unit weight of Ni increased with Ni loading. In the case of a fixed bed, the reactor was blocked by the deposited carbon on the catalyst after 120 h. However, the plugging was not observed for a fluidized bed reactor. This is one of the advantages of the fluidized bed utilization.
Since to keep a good fluidization quality to operate as a reactor, the fluidity of the catalyst particles on which carbon deposited was investigated. The fluidity of crashed silica support decreased after 30 min. The angle of repose increase with reaction time and carbon deposition. The initial value of the angle of repose for the crashed silica support was high. On the other hand, the value of the spherical alumina support was small and the good fluidity was observed during 9 h reaction.
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