2006 Fiscal Year Final Research Report Summary
Design for a shape-selective oxidation reaction system using zeolite nanocrystal-layered membrane
| Project/Area Number |
17360379
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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 | 一般 |
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| Research Field |
Reaction engineering/Process system
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
MASUDA Taka Hokkaido Univ., Grad. School of Eng., Professor, 大学院工学研究科, 教授 (20165715)
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| Co-Investigator(Kenkyū-buntansha) |
TAGO Teruoki Hokkaido Univ., Grad. School of Eng., Associate Professor, 大学院工学研究科, 助教授 (20304743)
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| Project Period (FY) |
2005 – 2006
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| Keywords | zeolite / nanocrystal / selective oxidation / selective deactivation of acid site / Ni-supporting zeolite / nanocrystal-layered membrane / catalytic membrane |
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| Research Abstract |
The main objective of this research is to develop a zeolite membrane exhibiting shape-selective oxidation properties. The major results are described below.
A)Preparation of mono-dispersed ZSM-5 zeolite nanocrystals: Two types of zeolites with different crystal size, 2.0 micro-meter (micro-zeolite) and 50 nano-meter (nano-zeolite), could be prepared. These zeolites show the same acidity, pore volume, and crystalinity regardless of the different crystal size. Methanol reaction was carried out over the ZSM-5 zeolites, which is a series of reactions from methanol to ether, olefins, paraffins, and aromatics. Though the decrease in the catalytic activity was observed just after the reaction in the micro-zeolite, the nano-zeolite exhibited the high activity and the long life-time.
B)Selective-deactivation of the acid sites at the outer surface: Acid sites of the zeolite at the outer surface were successfully deactivated by using phenyl-slilane compound. The intermediate of the dimthyl-ether could be selectively produced over the zeolite.
C)Preparation of nanocrystal-layered membrane: The ZSM-5 zeolite nanocrystals were piled up on an alumina filter. The thickness of the nanocrystals could be controlled in the range from 20 to 40 micrometer. The methanol reaction was carried out using the nanocrystal-layered membrane, and the selectivity of the intermediate such as ether and olefins successfully increased up to 90 %.
D)Ni-supporting zeolite for selective-oxidation system: Since the acid sites at the outer surface of the zeolite were deactivated, Ni ions could be selectively exchanged for protons at the inner pore of the ZSM-5 zeolite nanocrystals. Accordingly, Ni-supporting zeolite nanocrystals and membrane, which realizes the shape-selective oxidation, could be prepared.
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Research Products
(13 results)
