Mixed-Phase Oxide Catalyst Based on Mn-Mullite (Sm, Gd)Mn <sub>2</sub> O <sub>5</sub> for NO Oxidation in Diesel Exhaust
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- Weichao Wang
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
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- Geoffrey McCool
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
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- Neeti Kapur
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
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- Guang Yuan
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
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- Bin Shan
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
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- Matt Nguyen
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
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- Uschi M. Graham
- Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511, USA.
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- Burtron H. Davis
- Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511, USA.
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- Gary Jacobs
- Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511, USA.
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- Kyeongjae Cho
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
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- Xianghong (Kelly) Hao
- Nanostellar Inc., 3696 Haven Avenue, Redwood City, CA94063, USA.
書誌事項
- 公開日
- 2012-08-17
- DOI
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- 10.1126/science.1225091
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:title>Cleaning Diesel Exhaust</jats:title> <jats:p> One strategy for removing pollutants from diesel engine exhaust is to trap the unburned carbon soot and then to combust the soot with the NO <jats:sub>2</jats:sub> that is generated from NO; the two pollutants are then converted to N <jats:sub>2</jats:sub> and CO <jats:sub>2</jats:sub> . Diesel exhaust is relatively cold, compared to gasoline engine exhaust, and conversion of NO to NO <jats:sub>2</jats:sub> has required the use of platinum catalysts. <jats:bold> W. Wang <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="832" related-article-type="in-this-issue" vol="337" xlink:href="10.1126/science.1225091">832</jats:related-article> ) now report that a more earth-abundant catalyst, based on Mn-mullite (Sm, Gd)Mn <jats:sub>2</jats:sub> O <jats:sub>5</jats:sub> metal oxides was able to oxidize NO in simulated diesel exhaust at temperatures as low as 75°C. Spectroscopic studies and quantum chemical modeling suggested that Mn-nitrates formed on Mn-Mn dimer sites were the key intermediates responsible for NO <jats:sub>2</jats:sub> formation. </jats:p>
収録刊行物
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- Science
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Science 337 (6096), 832-835, 2012-08-17
American Association for the Advancement of Science (AAAS)
