| Project/Area Number |
07555554
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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 | Yamaguchi University |
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Principal Investigator |
TSUCHIYA Susumu Yamaguchi University, Faculty of Engineering, Professor, 工学部, 教授 (10016719)
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| Co-Investigator(Kenkyū-buntansha) |
SUGISE Ryoji Ube Industries Ltd.Dr., 宇部研究所, 主席研究員
SAKATA Yoshihisa Yamaguchi University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (40211263)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | catalyst / complex oxide / synthesis process / alcohol / copper / rare earth metal / methanol |
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| Research Abstract |
We inestigated such a novel catalyst system for hydrogenation as the mixture of complex oxide, Cu_6O_8Ln (NO_3), derivatives (Ln : lanthanide). This complex oxide canbe easily decomposed under hydrogen atmosphere form binary system of copper metal and lanthanide. We forcus on the catalytic behavior of the system investigated in the methanol systhesis and the hydrogenation of ethylene.
The complex oxide of Cu_6O_8Yb (NO_3) was prepared by thermal decomposition of Cu (NO_3) _2 and Yb (NO_3) _3 mixture under O_2 blowing at 700 K.The structure of the prepared oxide complex was confirmed by XRD.Cu-Yb_2O_3 was then prepared by the decomposition of Cu_6O_8Yb (NO_3) under H_2 atmosphere at prescribed temperature before the reaction.
A closed gas circulation system was used to follow the reaction. The reactionmixtures were analyzed by GLC.The catalyst morphology was observed by XRD,XPS and TEM-EDS.
CO hydrogenation was carried out over Cu-Yb_2O_3 and the ternary component catalyst, Cu/ZnO/Cr_2O_3. Cu-Yb_2O_3 was prepared from the corresponding complex oxide at 573 K.The main product of CO hydrogenation was methanol and the selectivity for methanol was more than 95 %. The formation of CO_2 was observed other than the hydrogenation. Judging from the time course of the reaction, CO_2 selectively formed at the initial stage and the activity decreased with increasing the passing time. Methanol produced constantly after the period for 2h. We have confirmed that the activity did not decrease over 50 h. At 473K,the Cu-Yb_2O_3 showed maximum activity, which is four times higher than that of the ternary component catalyst, Cu/ZnO/Cr_2O_3.
Since Cu-Yb_2O_3 is prepared from the decomposition of Cu_6O_8Yb (NO_3), the activity would be dependent on the preparation temperature. The catalyst pretreated at 523 K showed the maximum activity. The catalyst morphology was studied to elucidate the relationship between the catalytic acftivity and the pretreatment.
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