Source:http://linkedlifedata.com/resource/pubmed/id/21688407
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| Predicate | Object |
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| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
20
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| pubmed:dateCreated |
2011-6-17
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| pubmed:abstractText |
NO reduction by CO was investigated over CuO/?-Al2O3, Mn2O3/?-Al2O3, and CuOMn2O3/?-Al2O3 model catalysts before and after CO pretreatment at 300 °C. The CO-pretreated CuO-Mn2O3/?-Al2O3 catalyst exhibited higher catalytic activity than did the other catalysts. Based on X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV/Vis diffuse reflectance spectroscopy (DRS), Raman, and H2-temperature-programmed reduction (TPR) results, as well as our previous studies, the possible interaction model between dispersed copper and manganese oxide species as well as ?-Al2O3 surface has been proposed. In this model, Cu and Mn ions occupied the octahedral vacant sites of ?-Al2O3, with the capping oxygen on top of the metal ions to keep the charge conservation. For the fresh CuO/?-Al2O3 and Mn2O3/?-Al2O3 catalysts, the -Cu-O-Cu- and -Mn-O-Mn- species were formed on the surface of ?-Al2O3, respectively; but for the fresh CuO-Mn2O3/?-Al2O3 catalyst, -Cu-O-Mn- species existed on the surface of -Al2O3. After CO pretreatment, -Cu-?-Cu- and -Mn-?-Mn- (? represents surface oxygen vacancy (SOV)) species would be formed in CO-pretreated CuO/?-Al2O3 and CO-pretreated Mn2O3/?-Al2O3 catalysts, respectively; whereas -Cu-?-Mn- species existed in CO-pretreated CuO-Mn2O3/?-Al2O3. Herein, a new concept, surface synergetic oxygen vacancy (SSOV), which describes the oxygen vacancy formed between the individual Mn and Cu ions, is proposed for CO-pretreated CuO-Mn2O3/?-Al2O3 catalyst. In addition, the role of SSOV has also been approached by NO temperature-programmed desorption (TPD) and in situ FTIR experiments. The FTIR results of competitive adsorption between NO and CO on all the CO-pretreated CuO/?-Al2O3, Mn2O3/?-Al2O3, and CuO-Mn2O3/?-Al2O3 samples demonstrated that NO molecules mainly were adsorbed on Mn2+ and CO mainly on Cu+ sites. The current study suggests that the properties of the SSOVs in CO-pretreated CuO-Mn2O3/?-Al2O3 catalyst were significantly different to SOVs formed in CO-pretreated CuO/?-Al2O3 and Mn2O3/?-Al2O3 catalysts, and the SSOVs played an important role in NO reduction by CO.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
May
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| pubmed:issn |
1521-3765
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| pubmed:author | |
| pubmed:copyrightInfo |
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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| pubmed:issnType |
Electronic
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| pubmed:day |
9
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| pubmed:volume |
17
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
5668-79
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| pubmed:year |
2011
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| pubmed:articleTitle |
The remarkable enhancement of CO-pretreated CuO-Mn2O3/?-Al2O3 supported catalyst for the reduction of NO with CO: the formation of surface synergetic oxygen vacancy.
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| pubmed:affiliation |
Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, PR China.
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| pubmed:publicationType |
Journal Article
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