2000 Fiscal Year Final Research Report Summary
Prodical Application of Environmental Catalysis through the Chemical Vapor Deposition of Silica
| Project/Area Number |
10555278
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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 | 展開研究 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | Tottori University |
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Principal Investigator |
NIWA Miki Tottori Univ., Faculty of Engineering Professor, 工学部, 教授 (10023334)
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| Co-Investigator(Kenkyū-buntansha) |
KAZU Okumura Tottori Univ., Faculty of Engineering Research Associate, 工学部, 助手 (30294341)
NAONOBU Katada Tottori Univ., Faculty of Engineering Assistant Professor, 工学部, 助教授 (00243379)
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| Project Period (FY) |
1998 – 2000
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| Keywords | Environmental Catalyst / Hydrohobicity / Silica CVD / pallodium / Zeolite / Alumina / NO Removal / Catalytic Combastion |
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| Research Abstract |
The improvement of the catalytic activity and durability of Pd/zeolite catalyst for the NO-CH_4-O_2 reaction in the presence of water vapor is an important subject. We found that the much improvement in the durability was attained by the modification of the external surface of zeolite with SiO_2 monolayer through the chemical vapor deposition (CVD) due to the generation of the hydrophobic character in the external surface of zeolite. The initial activity for NO reduction was increased by the addition of the Ag, Mn into the Pd/zeolite. The combination of the addition effect of and CVD of SiO_2 layer over ZSM-5 external surface resulted in the improvement in both activity and durability of Pd for NO-CH_4-O_2 reaction.
A continuous-flow method of chemical vapor deposition of tetramethoxysilane on γ-alumina was developed for industrial utilization of silica monolayer solid-acid catalyst. The flow method caused relatively heterogeneous coverage of silicon compared to static reactor especially in the low silicon concentration region. However, the difference in the structure was small in the high silicon concentration region where the coverage arrived at almost 100%. The catalytic activity for double-bond isomerization of 1-butene and thermal stability obtained by the two methods were similar, showing that the continuous flow method was sufficient to prepare the silica monolayer catalyst industrially.
Chemical vapor deposition of Si(OCH_3)_4 was carried out on silicalite crystals in order to control the pore-opening size. Adsorption of alkanes on silicalite an CVD-silicalite was performed gravimetrically and chromatographically. It was found that the linear and branched paraffins could be separated by choosing the extent of silica deposition on silicalite.
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