Useful utilization of carbon monoxide to depress environmental problems
Project/Area Number |
05640669
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
物質変換
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Research Institution | Otsuma Woman's University |
Principal Investigator |
ITO Tomoyasu Otsuma Woman's University, School of Social Information Studies, Professor, 社会情報学部, 教授 (20087109)
|
Project Period (FY) |
1993 – 1994
|
Project Status |
Completed (Fiscal Year 1994)
|
Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
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Keywords | Carbon monoxide / Magnesium oxide catalyst / Environmental cleanup / Adsorption / Coordinative unsaturation / オリゴマー |
Research Abstract |
1. Carbon monoxide was found to be adsorbed on magnesium oxide catalyst as oligomer species consisting of one to four CO molecules even below room temperature. These oligomers have interesting structures and their isolation from the surface is highly desirable from a view point of useful utilization of gas causing pollution problems ; this is a next target to be solved. 2. The most-abundantly formd oligomer is a trimer, which is thermally stable at room temperature and can be formed even under very low CO concentration. However, these oligomer formation is easily poisoned by the coexistence of oxygen and water vapor. This should be overcome in future. 3. Oligomer formation is initiated by monomer formation on a coordinatively-unsaturated Mg ion ; further CO moleculers are added to this monomer to form oligomers if an O ion at the nearest lattice position is in low coordiantion state. 4. In the oligomer formation, an O ion acts as a base site on which oligomer itself is absorbed. An Mg ion as an acid site is also plays important oles in initiation of oligomer formation and stabilization of formed oligomer. Both the Mg and O ions concerned must be in coordinative-unsaturation. 5. A Part of monomer species formed on an O ion with specific environment is easily transformed into another monomer species below room temperature through which oxygen isotope exchange on the surface can take place. This mutual transformation between monomers has been confirmed by detailed study based on the molelular orbital method. 6. Adsorption state of carbon dioxide on magnesium oxide catalyst and oxidation behavior of CO on palladium catalyst have been also studied for comparison purpose.
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Report
(3 results)
Research Products
(25 results)