Rh-Pt Bimetallic Catalysts: Synthesis, Characterization, and Catalysis of Core-Shell, Alloy, and Monometallic Nanoparticles

被引:255
作者
Alayoglu, Selim [1 ]
Eichhorn, Bryan [1 ]
机构
[1] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA
基金
美国国家科学基金会;
关键词
D O I
10.1021/ja8061425
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Rh@Ptcore-shell, RhPt (1:1) alloy, and Rh + Pt monometallic nanoparticles (NPs) were prepared using standard polyol reduction chemistry in ethylene glycol (EG) with standard inorganic salts and polyvinylpyrrolidine (PVP55000) stabilizers. PVP-free colloids were also prepared but less stable than the PVP-protected NPs. Rh@Pt core-shell particles were prepared from 2.7, 3.3, and 3.9 nm Rh cores with varying shell thicknesses (similar to 1 and similar to 2 ML). The particles were characterized by a combination of TEM, single-particle EDS, EDS line scans, XRD analysis, Debye Function simulations, FT-IR, and micro-Raman CO-probe experiments. The three different architectures were evaluated for preferential oxidation of CO in hydrogen (PROX) using 1.0 wt % Pt loadings in Al2O3 supports. For hydrogen feeds with 0.2% CO and 0.5% O-2 the Rh @ Pt NP catalyst has the best activity with complete CO oxidation at 70 degrees C and very high PROX selectivity at 40 degrees C with 50% CO conversion.
引用
收藏
页码:17479 / 17486
页数:8
相关论文
共 40 条
  • [11] Preparation of Pt/Rh bimetallic colloidal particles in polymer solutions using borohydride-reduction
    Harada, Masafumi
    Einaga, Hisahiro
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2007, 308 (02) : 568 - 572
  • [12] Synthesis of solvent-stabilized colloidal nanoparticles of platinum, rhodium, and ruthenium by microwave-polyol process
    He, BL
    Chen, YX
    Liu, HF
    Liu, Y
    [J]. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 2005, 5 (02) : 266 - 270
  • [13] Radial anisotropic growth of rhodium nanoparticles
    Hoefelmeyer, JD
    Niesz, K
    Somorjai, GA
    Tilley, TD
    [J]. NANO LETTERS, 2005, 5 (03) : 435 - 438
  • [14] Rhodium nanoparticles from cluster seeds: Control of size and shape by precursor addition rate
    Humphrey, Simon M.
    Grass, Michael E.
    Habas, Susan E.
    Niesz, Krisztian
    Somorjai, Gabor A.
    Tilley, T. Don
    [J]. NANO LETTERS, 2007, 7 (03) : 785 - 790
  • [15] CO adsorption on epitaxially grown Pt layers on Ru (0001)
    Jakob, P.
    Schlapka, A.
    [J]. SURFACE SCIENCE, 2007, 601 (17) : 3556 - 3568
  • [16] Electrocatalysis of ethanol oxidation on Pt monolayers deposited on carbon-supported Ru and Rh nanoparticles
    Lima, F. H. B.
    Gonzalez, E. R.
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2008, 79 (04) : 341 - 346
  • [17] SHELL STRUCTURE OF CLUSTERS
    MARTIN, TP
    BERGMANN, T
    GOHLICH, H
    LANGE, T
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (17) : 6421 - 6429
  • [18] Preferential CO oxidation promoted by the presence of H2 over K-Pt/Al2O3
    Minemura, Y
    Ito, S
    Miyao, T
    Naito, S
    Tomishige, K
    Kunimori, K
    [J]. CHEMICAL COMMUNICATIONS, 2005, (11) : 1429 - 1431
  • [19] A new synthetic method toward bimetallic ruthenium platinum nanoparticles; composition induced structural changes
    Pan, C
    Dassenoy, F
    Casanove, MJ
    Philippot, K
    Amiens, C
    Lecante, P
    Mosset, A
    Chaudret, B
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (46) : 10098 - 10101
  • [20] Tuning of catalytic CO oxidation by changing composition of Rh-Pt bimetallic nanoparticles
    Park, Jeong Young
    Zhang, Yawen
    Grass, Michael
    Zhang, Tianfu
    Somorjai, Gabor A.
    [J]. NANO LETTERS, 2008, 8 (02) : 673 - 677