Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 황성주 | - |
dc.date.accessioned | 2016-08-28T12:08:50Z | - |
dc.date.available | 2016-08-28T12:08:50Z | - |
dc.date.issued | 2011 | - |
dc.identifier.issn | 1616-301X | - |
dc.identifier.other | OAK-7693 | - |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/221715 | - |
dc.description.abstract | Manganese oxide nanocrystals are combined with aluminum oxide nanocrystals to improve their crystallinity via calcination without a significant increase of crystal size. A nanocomposite, consisting of two metal oxides, can be synthesized by the reaction between permanganate anions and aluminum oxyhydroxide keggin cations. The as-prepared manganese oxide-aluminum oxide nanocomposite is X-ray amorphous whereas heat-treatment gives rise to the crystallization of an α-MnO 2 phase at 600 °C and Mn 3O 4/Mn 2O 3 and γ-Al 2O 3 phases at 800 °C. Electron microscopy and N 2 adsorption-desorption-isotherm analysis clearly demonstrate that the as-prepared nanocomposite is composed of a porous assembly of monodisperse primary particles with a size of ∼20 nm and a surface area of >410 m 2 g -1. Of particular interest is that the small particle size of the as-prepared nanocomposite is well-maintained up to 600 °C, a result of the prevention of the growth of manganate grains through nanoscale mixing with alumina grains. The calcined nanocomposite shows very-high catalytic activity for the oxidation of cyclohexene with an extremely high conversion efficiency of >95% within 15 min. The present results show that the improvement of the crystallinity without significant crystal growth is very crucial for optimizing the catalytic activity of manganese oxide nanocrystals. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. | - |
dc.language | English | - |
dc.title | A composite formation route to well-crystalline manganese oxide nanocrystals: High catalytic activity of manganate-alumina nanocomposites | - |
dc.type | Article | - |
dc.relation.issue | 12 | - |
dc.relation.volume | 21 | - |
dc.relation.index | SCIE | - |
dc.relation.index | SCOPUS | - |
dc.relation.startpage | 2301 | - |
dc.relation.lastpage | 2310 | - |
dc.relation.journaltitle | Advanced Functional Materials | - |
dc.identifier.doi | 10.1002/adfm.201100218 | - |
dc.identifier.wosid | WOS:000291723300015 | - |
dc.identifier.scopusid | 2-s2.0-79959503406 | - |
dc.author.google | Kim T.W. | - |
dc.author.google | Yoo H. | - |
dc.author.google | Kim I.Y. | - |
dc.author.google | Ha H.-W. | - |
dc.author.google | Han A.R. | - |
dc.author.google | Chang J.-S. | - |
dc.author.google | Lee J.S. | - |
dc.author.google | Hwang S.-J. | - |
dc.contributor.scopusid | 황성주(7404626171) | - |
dc.date.modifydate | 20190901081003 | - |