Selecteve catalytic reduction of NO with CO in the presence of oxygen
| Project/Area Number |
13650841
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
TANAKA Tsunehiro Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (70201621)
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| Co-Investigator(Kenkyū-buntansha) |
HITOMI Yutaka Graduate School of Engineering, Research Associate, 工学研究科, 助手 (20335186)
FUNABIKI Takuzo Graduate School of Engineering, Professor, 工学研究科, 教授 (70026061)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Cu catalyst / alumina / NO reduction / Carbon monoxide / deNOx reaction / XAFS / ESR / auto-reduction |
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| Research Abstract |
Since an outbreak of Nox gas in high temperature burning is inevitable, the reduction and/or removal of Nox is strongly requested from the viewpoint of environmental preservation. Although there have been a series of studies aiming at reduction and/or removal of Nox exhausted from diesel engine and lean-burn engine by reduction with hydrocarbons as an reductant, yet any catalysis system has not been used in practice because of the dependence of activity upon the kind of hydrocarbon and because of the catalyst life. In the present study, we attempted to develop the Nox removal SCR system with CO as a reductant, Cu/Al203 exhibits as high catalytic activity in the presence of oxygen as Rh/A1203, a model three-way catalyst, and higher activity in the region of lean-burn than Rh/A1203. In the term of project, we have found out the correlation between catalyst state and activity in the lean-burn condition and carried out the optimization of the catalyst. Catalytic activity varied with the loading of Cu and 1 wt% loaded catalyst exhibited the highest activity. But 0.25 wt% loaded catalyst exhibited highest TOF (turn-over-frequency) . ESR and XAFS showed that Cu species which is sintered by high temperature treatment exhibits high activity for CO oxidation resulting in the prevention from NO reduction. The Cu species effective for NO reduction was found to be highly dispersed mononuclear Cu species which is dominant species in 0.25 wt% loaded catalyst TPR spectral features of this catalyst showed that this Cu species is hardly reduced and the H2 reduction at higher than 1000 K does not bring about the formation of metallic Cu but monovalent Cu. The auto-reduction of this Cu species was observed by ESR and photoluminescence and reduced Cu is easily re-oxidized by NO but hardly re-oxidized by O2.
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Report
(3 results)
Research Products
(21 results)
