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  1. No Access

    Article

    Conquering Catalyst Complexity: Nanoparticle Synthesis and Instrument Development for Molecular and Atomistic Characterisation Under In Situ Conditions

    Most heterogeneous, homogeneous and enzyme catalysts are nanoparticles. Conquering the complexity of such materials’ mode of operation at the atomic and molecular level necessitates being able to elucidate the...

    G. A. Somorjai, S. K. Beaumont in Topics in Catalysis (2015)

  2. No Access

    Article

    Size and Shape Dependence on Pt Nanoparticles for the Methylcyclopentane/Hydrogen Ring Opening/Ring Enlargement Reaction

    Monodisperse Pt nanoparticles (NPs) with well-controlled sizes in the range between 1.5 and 10.8 nm, and shapes of octahedron, cube, truncated octahedron and spheres (~6 nm) were synthesized employing the poly...

    S. Alayoglu, C. Aliaga, C. Sprung, G. A. Somorjai in Catalysis Letters (2011)

  3. No Access

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    Influence of Particle Size on Reaction Selectivity in Cyclohexene Hydrogenation and Dehydrogenation over Silica-Supported Monodisperse Pt Particles

    The role of particle size during the hydrogenation/dehydrogenation of cyclohexene (10 Torr C6H10, 200–600 Torr H2, and 273–650 K) was studied over a series of monodisperse Pt/SBA-15 catalysts. The conversion of c...

    R. M. Rioux, B. B. Hsu, M. E. Grass, H. Song, G. A. Somorjai in Catalysis Letters (2008)

  4. No Access

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    Molecular surface science of C–H bond activation and polymerization catalysis

    Surface science studies of heterogeneous catalysis use model systems ranging from single crystals to monodispersed nanoparticles in the 1–10 nm range. Molecular studies reveal that bond activation (C–H, H–H, C...

    A. M. Contreras, M. Montano, S. J. Kweskin, M. M. Koebel, K. Bratlie… in Topics in Catalysis (2006)

  5. No Access

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    Fabrication of 2-dimensional platinum nanocatalyst arrays by electron beam lithography: ethylene hydrogenation and CO-poisoning reaction studies

    Electron beam lithography (EBL) has been used to fabricate platinum nanoparticle arrays in the 20-nm size range on oxide thin films of silica and alumina deposited onto silicon wafers. A combination of charact...

    A. M. Contreras, J. Grunes, X.-M. Yan, A. Liddle, G. A. Somorjai in Topics in Catalysis (2006)

  6. No Access

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    Monodisperse platinum nanoparticles of well-defined shape: synthesis, characterization, catalytic properties and future prospects

    Monodisperse platinum nanoparticles with well-defined faceting have been synthesized by a modified polyol process with the addition of silver ions. Pt nanoparticles are encapsulated in mesoporous silica during in...

    R. M. Rioux, H. Song, M. Grass, S. Habas, K. Niesz… in Topics in Catalysis (2006)

  7. No Access

    Article

    Catalytic CO oxidation reaction studies on lithographically fabricated platinum nanowire arrays with different oxide supports

    Deep-ultraviolet lithography has been coupled with size-reduction and nanoimprint lithography to create high-density arrays of 20-nm wide platinum nanowires supported on oxide thin films of silica, alumina, zi...

    A. M. Contreras, X.-M. Yan, S. Kwon, J. Bokor, G. A. Somorjai in Catalysis Letters (2006)

  8. No Access

    Article

    Fabrication of Dense Arrays of Platinum Nanowires on Silica, Alumina, Zirconia and Ceria Surfaces as 2-D Model Catalysts

    High-density arrays of platinum nanowires with dimensions 20 nm × 5 nm × 12 μm (width × height × length) have been produced on planar oxide thin films of silica, alumina, zirconia, and ceria. In this multi-ste...

    X.-M. Yan, S. Kwon, A.M. Contreras, M.M. Koebel, J. Bokor… in Catalysis Letters (2005)

  9. No Access

    Article

    Platinum nanoparticle encapsulation during hydrothermal growth of mesoporous oxides: Synthesis, characterization and catalytic properties

    A synthetic method for the design of heterogeneous catalysts incorporating monodisperse platinum nanoparticles into ordered mesoporous oxide frameworks has been developed. Nanoparticles were synthesized in sol...

    Robert M. Rioux, Hyunjoon Song, James D. Hoefelmeyer… in MRS Online Proceedings Library (2005)

  10. No Access

    Article

    Fabrication of platinum nanoparticles and nanowires by electron beam lithography (EBL) and nanoimprint lithography (NIL): comparison of ethylene hydrogenation kinetics

    Electron beam lithography (EBL), size reduction lithography (SRL), and nanoimprint lithography (NIL) have been utilized to produce platinum nanoparticles and nanowires in the 20–60-nm size range on oxide films...

    A. M. Contreras, J. Grunes, X. -M. Yan, A. Liddle, G. A. Somorjai in Catalysis Letters (2005)

  11. No Access

    Article

    Restructuring of Hydrogenation Metal Catalysts Under the Influence of CO and H2

    CO and H2 structure and reactivity on single-crystal transition metal surfaces (platinum, rhodium, and palladium) were examined by surface-sensitive techniques including scanning tunneling microscopy (STM) and su...

    G.A. Somorjai, K.S. Hwang, J.S. Parker in Topics in Catalysis (2003)

  12. No Access

    Article

    The Surface Science of Catalytic Selectivity

    Catalysis science research employing model systems (single crystal surfaces) focused on understanding and enhancing catalytic activity (turnover rate). The catalyst surface structure and the mobility of adsorb...

    G.A. Somorjai, Minchul Yang in Topics in Catalysis (2003)

  13. No Access

    Article

    A Tribute to John Meurig Thomas: Llongyfarchiadau ar eich penblwydd

    G.A. Somorjai, M.W. Roberts in Topics in Catalysis (2003)

  14. No Access

    Article

    High-Temperature Short-Contact-Time Supersonic Nozzle Chemistry of Light Aliphatic Hydrocarbons

    Nozzles fabricated variously from nickel, molybdenum, iron, palladium, and quartz were utilized to produce longer-chain hydrocarbons CmHn (m≥3, n≤m) from C2 (ethane, acetylene) and C1 (methane) reactants at nozzl...

    L. Romm, G.A. Somorjai in Topics in Catalysis (2002)

  15. No Access

    Article

    AFM and TEM Studies of Pt Nanoparticle Arrays Supported on Alumina Model Catalyst Prepared by Electron Beam Lithography

    Pt nanoparticle arrays were fabricated by electron beam lithography as a model for supported catalysts. The adhesion strength of 28 nm Pt nanoparticles deposited on alumina has been studied using contact mode ...

    T. Tsirlin, J. Zhu, J. Grunes, G.A. Somorjai in Topics in Catalysis (2002)

  16. No Access

    Article

    Active Sites in Heterogeneous Catalysis: Development of Molecular Concepts and Future Challenges

    The concept that catalytic turnover occurs at a small fraction of the surface sites dates back to the 1920s. The application of modern surface science techniques and model catalysts confirmed the presence of a...

    G.A. Somorjai, K.R. McCrea, J. Zhu in Topics in Catalysis (2002)

  17. No Access

    Article

    Research in Nanosciences – Great Opportunity for Catalysis Science

    Catalysts represent the oldest commercial application of nanotechnology. It is suggested that the focus of catalysis research in the 21st century should be on achieving 100% selectivity for the desired product...

    G.A. Somorjai, Y.G. Borodko in Catalysis Letters (2001)

  18. No Access

    Article

    Formation of C m H n (m ≥ 3, n ≤ m) hydrocarbons from C1 and C2 molecules by high‐temperature (≥1000°C), short‐contact‐time (1–10 ms) nozzle beam reactions

    A nozzle, fabricated from nickel, molybdenum, iron, palladium, and quartz was utilized to produce longer chain hydrocarbons, C m H n (m ≥ 3, n≤...

    L. Romm, G.A. Somorjai in Catalysis Letters (2000)

  19. No Access

    Article

    Adsorbate (substrate)-induced restructuring of active transition metal sites of heterogeneous and enzyme catalysts

    Adsorbate-induced restructuring of transition metal surfaces and those of transition metal clusters embedded in metalloproteins has been shown to be a dominant phenomenon by LEED surface crystallography and X-...

    G.A. Somorjai, Y. Borodko in Catalysis Letters (1999)

  20. No Access

    Article

    Sum frequency generation (SFG) – surface vibrational spectroscopy studies of buried interfaces: catalytic reaction intermediates on transition metal crystal surfaces at high reactant pressures; polymer surface structures at the solid–gas and solid–liquid interfaces

    Z. Chen, D.H. Gracias, G.A. Somorjai in Applied Physics B (1999)

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