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RISS 인기검색어
- 검색키워드
- 저자 : Renzas, J. Russell (검색결과 2 건)
- 무료
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Size Effect of Ruthenium Nanoparticles in Catalytic Carbon Monoxide Oxidation
Joo, Sang Hoon,Park, Jeong Y.,Renzas, J. Russell,Butcher, Derek R.,Huang, Wenyu,Somorjai, Gabor A. American Chemical Society 2010 Nano letters Vol.10 No.7
<P>Carbon monoxide oxidation over ruthenium catalysts has shown an unusual catalytic behavior. Here we report a particle size effect on CO oxidation over Ru nanoparticle (NP) catalysts. Uniform Ru NPs with a tunable particle size from 2 to 6 nm were synthesized by a polyol reduction of Ru(acac)<SUB>3</SUB> precursor in the presence of poly(vinylpyrrolidone) stabilizer. The measurement of catalytic activity of CO oxidation over two-dimensional Ru NPs arrays under oxidizing reaction conditions (40 Torr CO and 100 Torr O<SUB>2</SUB>) showed an activity dependence on the Ru NP size. The CO oxidation activity increases with NP size, and the 6 nm Ru NP catalyst shows 8-fold higher activity than the 2 nm catalysts. The results gained from this study will provide the scientific basis for future design of Ru-based oxidation catalysts.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-7/nl101700j/production/images/medium/nl-2010-01700j_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl101700j'>ACS Electronic Supporting Info</A></P>
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Qadir, Kamran,Joo, Sang Hoon,Mun, Bongjin S.,Butcher, Derek R.,Renzas, J. Russell,Aksoy, Funda,Liu, Zhi,Somorjai, Gabor A.,Park, Jeong Young American Chemical Society 2012 NANO LETTERS Vol.12 No.11
<P>Recent progress in colloidal synthesis of nanoparticles with well-controlled size, shape, and composition, together with development of in situ surface science characterization tools, such as ambient pressure X-ray photoelectron spectroscopy (APXPS), has generated new opportunities to unravel the surface structure of working catalysts. We report an APXPS study of Ru nanoparticles to investigate catalytically active species on Ru nanoparticles under oxidizing, reducing, and CO oxidation reaction conditions. The 2.8 and 6 nm Ru nanoparticle model catalysts were synthesized in the presence of poly(vinyl pyrrolidone) polymer capping agent and deposited onto a flat Si support as two-dimensional arrays using the Langmuir–Blodgett deposition technique. Mild oxidative and reductive characteristics indicate the formation of surface oxide on the Ru nanoparticles, the thickness of which is found to be dependent on nanoparticle size. The larger 6 nm Ru nanoparticles were oxidized to a smaller extent than the smaller Ru 2.8 nm nanoparticles within the temperature range of 50–200 °C under reaction conditions, which appears to be correlated with the higher catalytic activity of the bigger nanoparticles. We found that the smaller Ru nanoparticles form bulk RuO<SUB>2</SUB> on their surfaces, causing the lower catalytic activity. As the size of the nanoparticle increases, the core–shell type RuO<SUB>2</SUB> becomes stable. Such in situ observations of Ru nanoparticles are useful in identifying the active state of the catalysts during use and, hence, may allow for rational catalyst designs for practical applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-11/nl303072d/production/images/medium/nl-2012-03072d_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl303072d'>ACS Electronic Supporting Info</A></P>
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