All Outputs (49)

Critical Role of Oxygen in Silver-Catalyzed Glaser-Hay Coupling on Ag(100) in Vacuum and in Solution on Ag Particles (2017)
Journal Article
Orozco, N., Kyriakou, G., Beaumont, S., Fernandez Sanz, J., Holgado, J., Taylor, M., …Lambert, R. (2017). Critical Role of Oxygen in Silver-Catalyzed Glaser-Hay Coupling on Ag(100) in Vacuum and in Solution on Ag Particles. ACS Catalysis, 7(5), 3113-3120. https://doi.org/10.1021/acscatal.7b00431

The essential role of oxygen in enabling heterogeneously catalyzed Glaser-Hay coupling of phenylacetylene on the Ag(100) was elucidated by STM, laboratory and synchrotron photoemission and DFT calculations. In the absence of co-adsorbed oxygen, pheny... Read More about Critical Role of Oxygen in Silver-Catalyzed Glaser-Hay Coupling on Ag(100) in Vacuum and in Solution on Ag Particles.

Magnetic recyclable microcomposite silica-steel core with TiO₂ nanocomposite shell photocatalysts for sustainable water purification (2017)
Journal Article
Wilson, M., Cheng, C., Oswald, G., Srivastava, R., Beaumont, S., & Badyal, J. (2017). Magnetic recyclable microcomposite silica-steel core with TiO₂ nanocomposite shell photocatalysts for sustainable water purification. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 523, 27-37. https://doi.org/10.1016/j.colsurfa.2017.03.034

Micron-sized steel particles encapsulated within a silica host matrix and then coated with a photocatalytic TiO2 nanocomposite shell have been prepared using sol-gel chemistry and shown to readily degrade waterborne organic pollutants during UV illum... Read More about Magnetic recyclable microcomposite silica-steel core with TiO₂ nanocomposite shell photocatalysts for sustainable water purification.

Recyclable palladium catalyst cloths for carbon-carbon coupling reactions (2017)
Journal Article
Wilson, M., Kore, R., Fraser, R., Beaumont, S., Srivastava, R., & Badyal, J. (2017). Recyclable palladium catalyst cloths for carbon-carbon coupling reactions. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 520, 788-795. https://doi.org/10.1016/j.colsurfa.2017.01.050

Low loading palladium catalyst cloths have been prepared by surface complexation of palladium(II) chloride with plasmachemical imidazole functionalised non-woven polypropylene cloth. For Sonogashira, Mizoroki-Heck, and Suzuki-Miyaura carbon-carbon co... Read More about Recyclable palladium catalyst cloths for carbon-carbon coupling reactions.

Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea (2016)
Journal Article
Wigzell, J., Racovita, R., Stentiford, B., Wilson, M., Harris, M., Fletcher, I., …Badyal, J. (2016). Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 506, 344-355. https://doi.org/10.1016/j.colsurfa.2016.06.058

The young leaves of the bamboo plant, Phyllostachys aurea, exhibit a distinct dual wetting behaviour on their adaxial surface. Contact angle analysis, variable pressure (environmental) scanning electron microscopy, gas chromatography, time-of-flight... Read More about Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea.

X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer–Tropsch synthesis catalysts (2016)
Journal Article
Herbert, J. J., Senecal, P., Martin, D. J., Bras, W., Beaumont, S. K., & Beale, A. M. (2016). X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer–Tropsch synthesis catalysts. Catalysis Science & Technology, 6(15), 5773-5791. https://doi.org/10.1039/c6cy00581k

This review aims to critically assess the use of X-ray techniques, both of a scattering (e.g. X-ray diffraction (XRD), pair distribution function (PDF)) and spectroscopic nature (X-ray absorption spectroscopy (XAFS)), in the study of cobalt-based Fis... Read More about X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer–Tropsch synthesis catalysts.

Spatially orthogonal chemical functionalization of a hierarchical pore network for catalytic cascade reactions (2015)
Journal Article
Parlett, C. M., Isaacs, M. A., Beaumont, S. K., Bingham, L. M., Hondow, N. S., Wilson, K., & Lee, A. F. (2016). Spatially orthogonal chemical functionalization of a hierarchical pore network for catalytic cascade reactions. Nature Materials, 15(2), 178-182. https://doi.org/10.1038/nmat4478

The chemical functionality within porous architectures dictates their performance as heterogeneous catalysts1; however, synthetic routes to control the spatial distribution of individual functions within porous solids are limited. Here we report the... Read More about Spatially orthogonal chemical functionalization of a hierarchical pore network for catalytic cascade reactions.

Selective oxidation of cyclohexene through gold functionalized silica monolith microreactors (2015)
Journal Article
Alotaibi, M. T., Taylor, M. J., Liu, D., Beaumont, S. K., & Kyriakou, G. (2016). Selective oxidation of cyclohexene through gold functionalized silica monolith microreactors. Surface Science, 646, 179-185. https://doi.org/10.1016/j.susc.2015.10.039

Two simple, reproducible methods of preparing evenly distributed Au nanoparticle containing mesoporous silica monoliths are investigated. These Au nanoparticle containing monoliths are subsequently investigated as flow reactors for the selective oxid... Read More about Selective oxidation of cyclohexene through gold functionalized silica monolith microreactors.

Conquering Catalyst Complexity: Nanoparticle Synthesis and Instrument Development for Molecular and Atomistic Characterisation Under In Situ Conditions (2015)
Journal Article
Somorjai, G. A., & Beaumont, S. K. (2015). Conquering Catalyst Complexity: Nanoparticle Synthesis and Instrument Development for Molecular and Atomistic Characterisation Under In Situ Conditions. Topics in Catalysis, 58(10), 560-572. https://doi.org/10.1007/s11244-015-0398-5

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 their structure under operational conditions... Read More about Conquering Catalyst Complexity: Nanoparticle Synthesis and Instrument Development for Molecular and Atomistic Characterisation Under In Situ Conditions.

Sonogashira Cross-Coupling and Homocoupling on a Silver Surface: Chlorobenzene and Phenylacetylene on Ag(100) (2015)
Journal Article
Sanchez-Sanchez, C., Orozco, N., Holgado, J. P., Beaumont, S. K., Kyriakou, G., Watson, D. J., …Lambert, R. M. (2015). Sonogashira Cross-Coupling and Homocoupling on a Silver Surface: Chlorobenzene and Phenylacetylene on Ag(100). Journal of the American Chemical Society, 137(2), 940-947. https://doi.org/10.1021/ja5115584

Scanning tunneling microscopy, temperature-programmed reaction, near-edge X-ray absorption fine structure spectroscopy, and density functional theory calculations were used to study the adsorption and reactions of phenylacetylene and chlorobenzene on... Read More about Sonogashira Cross-Coupling and Homocoupling on a Silver Surface: Chlorobenzene and Phenylacetylene on Ag(100).

A nanoscale demonstration of hydrogen atom spillover and surface diffusion across silica using the kinetics of CO₂ methanation catalyzed on spatially separate Pt and Co nanoparticles (2014)
Journal Article
Beaumont, S. K., Alayoglu, S., Specht, C., Kruse, N., & Somorjai, G. A. (2014). A nanoscale demonstration of hydrogen atom spillover and surface diffusion across silica using the kinetics of CO₂ methanation catalyzed on spatially separate Pt and Co nanoparticles. Nano Letters, 14(8), 4792-4796. https://doi.org/10.1021/nl501969k

Hydrogen spillover is of great importance to understanding many phenomena in heterogeneous catalysis and has long been controversial. Here we exploit well-defined nanoparticles to demonstrate its occurrence through evaluation of CO2 methanation kinet... Read More about A nanoscale demonstration of hydrogen atom spillover and surface diffusion across silica using the kinetics of CO₂ methanation catalyzed on spatially separate Pt and Co nanoparticles.

Combining in situ NEXAFS spectroscopy and CO₂ methanation kinetics to study Pt and Co nanoparticle catalysts reveals key insights into the role of platinum in promoted cobalt catalysis (2014)
Journal Article
Beaumont, S. K., Alayoglu, S., Specht, C., Michalak, W. D., Pushkarev, V. V., Guo, J., …Somorjai, G. A. (2014). Combining in situ NEXAFS spectroscopy and CO₂ methanation kinetics to study Pt and Co nanoparticle catalysts reveals key insights into the role of platinum in promoted cobalt catalysis. Journal of the American Chemical Society, 136(28), 9898-9901. https://doi.org/10.1021/ja505286j

The mechanistic role of platinum and precious metals in promoting cobalt hydrogenation catalysts of the type used in reactions such as Fischer–Tropsch synthesis is highly debated. Here we use well-defined monometallic Pt and Co nanoparticles (NPs) an... Read More about Combining in situ NEXAFS spectroscopy and CO₂ methanation kinetics to study Pt and Co nanoparticle catalysts reveals key insights into the role of platinum in promoted cobalt catalysis.

Recent developments in the application of nanomaterials to understanding molecular level processes in cobalt catalysed Fischer-Tropsch synthesis (2014)
Journal Article
Beaumont, S. K. (2014). Recent developments in the application of nanomaterials to understanding molecular level processes in cobalt catalysed Fischer-Tropsch synthesis. Physical Chemistry Chemical Physics, 16(11), 5034-5043. https://doi.org/10.1039/c3cp55030c

This perspective offers an overview of using nanomaterials for understanding cobalt catalysed Fischer–Tropsch chemistry. Nanomaterials now afford unprecedented control of size, shape and structure at the nanometre scale. This makes them invaluable to... Read More about Recent developments in the application of nanomaterials to understanding molecular level processes in cobalt catalysed Fischer-Tropsch synthesis.

Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization (2013)
Journal Article
Alayoglu, S., Beaumont, S. K., Melaet, G., Lindeman, A. E., Musselwhite, N., Brooks, C. J., …Somorjai, G. A. (2013). Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization. Journal of Physical Chemistry C, 117(42), 21803-21809. https://doi.org/10.1021/jp405745n

In this paper, we report the colloidal synthesis and detailed characterization of 11 nm bimetallic CoCu nanoparticle catalysts. Presently Co and Cu is an attractive combination because of their respective properties for industrially important Fischer... Read More about Surface Composition Changes of Redox Stabilized Bimetallic CoCu Nanoparticles Supported on Silica under H₂ and O₂ Atmospheres and During Reaction between CO₂ and H₂: In Situ X-ray Spectroscopic Characterization.

Exploring surface science and restructuring in reactive atmospheres of colloidally prepared bimetallic CuNi and CuCo nanoparticles on SiO₂ in situ using ambient pressure X-ray photoelectron spectroscopy (2013)
Journal Article
Beaumont, S. K., Alayoglu, S., Pushkarev, V. V., Liu, Z., Kruse, N., & Somorjai, G. A. (2013). Exploring surface science and restructuring in reactive atmospheres of colloidally prepared bimetallic CuNi and CuCo nanoparticles on SiO₂ in situ using ambient pressure X-ray photoelectron spectroscopy. Faraday Discussions, 162, 31-44. https://doi.org/10.1039/c2fd20145c

Bimetallic nanoparticles (11 nm diameter) of CuNi and CuCo were prepared by a new synthetic route and the 1:1 atomic ratio of their constituent elements confirmed using STEM-EDS at a single particle level. These nanoparticles, supported on the native... Read More about Exploring surface science and restructuring in reactive atmospheres of colloidally prepared bimetallic CuNi and CuCo nanoparticles on SiO₂ in situ using ambient pressure X-ray photoelectron spectroscopy.

Hydrogenation of benzene and toluene over size controlled Pt/SBA-15 catalysts: Elucidation of the Pt particle size effect on reaction kinetics (2012)
Journal Article
Pushkarev, V. V., An, K., Alayoglu, S., Beaumont, S. K., & Somorjai, G. A. (2012). Hydrogenation of benzene and toluene over size controlled Pt/SBA-15 catalysts: Elucidation of the Pt particle size effect on reaction kinetics. Journal of Catalysis, 292, 64-72. https://doi.org/10.1016/j.jcat.2012.04.022

Vapor-phase hydrogenation of benzene and toluene over a size-dependent (1.5–5.2 nm) series of Pt nanoparticles (NPs) encapsulated in polyvinylpyrrolidone (PVP) or polyamidoamine (PAMAM) dendrimer and supported in SBA-15 mesoporous silica was investig... Read More about Hydrogenation of benzene and toluene over size controlled Pt/SBA-15 catalysts: Elucidation of the Pt particle size effect on reaction kinetics.

Reforming of C₂ Hydrocarbons Over Model Pt Nanoparticle Catalysts (2012)
Journal Article
Alayoglu, S., Pushkarev, V. V., Musselwhite, N., An, K., Beaumont, S. K., & Somorjai, G. A. (2012). Reforming of C₂ Hydrocarbons Over Model Pt Nanoparticle Catalysts. Topics in Catalysis, 55(11-13), 723-730. https://doi.org/10.1007/s11244-012-9873-4

Size-controlled model Pt nanoparticle catalysts, synthesized by colloidal chemistry, were used to study the hydrogenative reforming of three C6 hydrocarbons in mixtures with 5:1 excess of H2: methylcyclopentane, n-hexane and 2-methylpentane. We found... Read More about Reforming of C₂ Hydrocarbons Over Model Pt Nanoparticle Catalysts.

Size-Controlled Model Co Nanoparticle Catalysts for CO₂ Hydrogenation: Synthesis, Characterization, and Catalytic Reactions (2012)
Journal Article
: Iablokov, V., Beaumont, S. K., Alayoglu, S., Pushkarev, V. V., Specht, C., Gao, J., …Somorjai, G. A. (2012). Size-Controlled Model Co Nanoparticle Catalysts for CO₂ Hydrogenation: Synthesis, Characterization, and Catalytic Reactions. Nano Letters, 12(6), 3091-3096. https://doi.org/10.1021/nl300973b

Model cobalt catalysts for CO2 hydrogenation were prepared using colloidal chemistry. The turnover frequency at 6 bar and at 200–300 °C increased with cobalt nanoparticle size from 3 to 10 nm. It was demonstrated that near monodisperse nanoparticles... Read More about Size-Controlled Model Co Nanoparticle Catalysts for CO₂ Hydrogenation: Synthesis, Characterization, and Catalytic Reactions.

Heterogeneously catalyzing C-C coupling reactions with precious metal nanoparticles (2012)
Journal Article
Beaumont, S. K. (2012). Heterogeneously catalyzing C-C coupling reactions with precious metal nanoparticles. Journal of Chemical Technology and Biotechnology, 87(5), 595-600. https://doi.org/10.1002/jctb.3748

C–C coupling reactions are ubiquitous in synthetic chemistry, joining together fragments of larger molecules within overall synthetic schemes. Many obvious operational advantages would result from catalyzing such processes heterogeneously, however, t... Read More about Heterogeneously catalyzing C-C coupling reactions with precious metal nanoparticles.

In situ study of oxidation states and structure of 4 nm CoPt bimetallic nanoparticles during CO oxidation using X-ray spectroscopies in comparison with reaction turnover frequency (2012)
Journal Article
Zheng, F., Alayoglu, S., Pushkarev, V. V., Beaumont, S. K., Specht, C., Aksoy, F., …Somorjai, G. A. (2012). In situ study of oxidation states and structure of 4 nm CoPt bimetallic nanoparticles during CO oxidation using X-ray spectroscopies in comparison with reaction turnover frequency. Catalysis Today, 182(1), 54-59. https://doi.org/10.1016/j.cattod.2011.10.009

In situ near edge X-ray absorption fine structure (NEXAFS) spectroscopy and ambient pressure X-ray photoelectron spectroscopy (AP-XPS) were performed to monitor the oxidation state and structure of 4 nm CoPt nanoparticles during the reaction of CO wi... Read More about In situ study of oxidation states and structure of 4 nm CoPt bimetallic nanoparticles during CO oxidation using X-ray spectroscopies in comparison with reaction turnover frequency.

Determination of Molecular Surface Structure, Composition, and Dynamics under Reaction Conditions at High Pressures and at the Solid–Liquid Interface (2011)
Journal Article
Somorjai, G. A., Beaumont, S. K., & Alayoglu, S. (2011). Determination of Molecular Surface Structure, Composition, and Dynamics under Reaction Conditions at High Pressures and at the Solid–Liquid Interface. Angewandte Chemie International Edition, 50(43), 10116-10129. https://doi.org/10.1002/anie.201008214

In the last two decades, surface-science experiments and techniques have been developed to focus on obtaining molecular information under reaction conditions at high pressures (near or above 1 bar) and liquid interfaces. This Minireview describes the... Read More about Determination of Molecular Surface Structure, Composition, and Dynamics under Reaction Conditions at High Pressures and at the Solid–Liquid Interface.