1999 Fiscal Year Final Research Report Summary
Development of New Generation Ammonia Synthesis Catalyst Process
| Project/Area Number |
10355032
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
AIKA Ken-ichi Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Professor, 大学院・総合理工学研究科, 教授 (20016736)
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| Co-Investigator(Kenkyū-buntansha) |
INAZU Koji Instructor Research assistant, Insructor, 大学院・総合理工学研究科, 助手 (70272698)
IZUMI Yasuo Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Instructor, 大学院・総合理工学研究科, 講師 (50251666)
KOBAYASHI Takaaki Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Assistant Professor, 大学院・総合理工学研究科, 助教授 (90005984)
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| Project Period (FY) |
1998 – 1999
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| Keywords | Ammonia Synthesis / Ruthenium Catalyst / Promoter Effect / High Pressure Hydrogen Treatment / Activated Carbon Supported Ruthenium Catalyst / Methanation |
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| Research Abstract |
Development of New Generation Ammonia Synthesis Catalyst Process
Among several supports, active carbon (AC) was found to be most effective in ruthenium catalysts for ammonia synthesis.
Electronic promoter such as alkali nitrate is necessary to be added to Ru/AC. Promoter nitrate must be decomposed under hydrogen stream at high temperature to the corresponding oxide or hydroxide (CsNOィイD23ィエD2→ CsOH, Ba(NOィイD23ィエD2)ィイD22ィエD2→ BaO). In this study, this hydrogen treatment process (including nitrate decomposition and partial methanation of the support AC) was found to be quite important to activate the catalysts. The hydrogen treatment is recommended to be carried out with slow heating rate (10℃/min) of temperature increase up to 550℃. Promoter decomposition was completed up to 365℃, so the extra heat treatment at the high temperature initiated the methanation of carbon support. The last process was found to be the key factor of catalyst activation, where carbon surrounding Ru particle is partially hydrogenated (to give a proper situation of Ru-CsOH interaction). The excess heating (above 550℃) brings either Ru sintering or deformation of carbon support, which gives poor activity.
Ru-CsOH/AC which is activated properly gives much higher ammonia activity than the commercial iron catalysts. The basic principle to prepare the second generation ammonia synthesis catalyst was established by this study.
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