201
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Xin HL, Alayoglu S, Tao R, Genc A, Wang CM, Kovarik L, Stach EA, Wang LW, Salmeron M, Somorjai GA, Zheng H. Revealing the atomic restructuring of Pt-Co nanoparticles. NANO LETTERS 2014; 14:3203-3207. [PMID: 24762053 DOI: 10.1021/nl500553a] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We studied Pt-Co bimetallic nanoparticles during oxidation in O2 and reduction in H2 atmospheres using an aberration corrected environmental transmission electron microscope. During oxidation Co migrates to the nanoparticle surface forming a strained epitaxial CoO film. It subsequently forms islands via strain relaxation. The atomic restructuring is captured as a function of time. During reduction cobalt migrates back to the bulk, leaving a monolayer of platinum on the surface.
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Affiliation(s)
- Huolin L Xin
- Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720 United States
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202
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Hansen TW, Wagner JB. Catalysts under Controlled Atmospheres in the Transmission Electron Microscope. ACS Catal 2014. [DOI: 10.1021/cs401148d] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Thomas W. Hansen
- Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Jakob B. Wagner
- Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
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203
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Dimitratos N, Hammond C, Kiely CJ, Hutchings GJ. Catalysis using colloidal-supported gold-based nanoparticles. APPLIED PETROCHEMICAL RESEARCH 2014. [DOI: 10.1007/s13203-014-0059-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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204
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Innovative strategy with potential to increase hemodialysis efficiency and safety. Sci Rep 2014; 4:4425. [PMID: 24651843 PMCID: PMC3961733 DOI: 10.1038/srep04425] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 03/04/2014] [Indexed: 01/22/2023] Open
Abstract
Uremic toxins are mainly represented by blood urine nitrogen (BUN) and creatinine (Crea) whose removal is critically important in hemodialysis (HD) for kidney disease. Patients undergoing HD have a complex illness, resulting from: inadequate removal of organic waste, dialysis-induced oxidative stress and membrane-induced inflammation. Here we report innovative breakthroughs for efficient and safe HD by using a plasmon-induced dialysate comprising Au nanoparticles (NPs)-treated (AuNT) water that is distinguishable from conventional deionized (DI) water. The diffusion coefficient of K3Fe(CN)6 in saline solution can be significantly increased from 2.76, to 4.62 × 10−6 cm s−1, by using AuNT water prepared under illumination by green light-emitting diodes (LED). In vitro HD experiments suggest that the treatment times for the removals of 70% BUN and Crea are reduced by 47 and 59%, respectively, using AuNT water instead of DI water in dialysate, while additionally suppressing NO release from lipopolysaccharide (LPS)-induced inflammatory cells.
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205
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Fujita T, Tokunaga T, Zhang L, Li D, Chen L, Arai S, Yamamoto Y, Hirata A, Tanaka N, Ding Y, Chen M. Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. NANO LETTERS 2014; 14:1172-1177. [PMID: 24506191 DOI: 10.1021/nl403895s] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.
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Affiliation(s)
- Takeshi Fujita
- Advanced Institute for Materials Research, Tohoku University , Sendai 980-8577, Japan
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206
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Guo Z, Liu B, Zhang Q, Deng W, Wang Y, Yang Y. Recent advances in heterogeneous selective oxidation catalysis for sustainable chemistry. Chem Soc Rev 2014; 43:3480-524. [PMID: 24553414 DOI: 10.1039/c3cs60282f] [Citation(s) in RCA: 448] [Impact Index Per Article: 44.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Oxidation catalysis not only plays a crucial role in the current chemical industry for the production of key intermediates such as alcohols, epoxides, aldehydes, ketones and organic acids, but also will contribute to the establishment of novel green and sustainable chemical processes. This review is devoted to dealing with selective oxidation reactions, which are important from the viewpoint of green and sustainable chemistry and still remain challenging. Actually, some well-known highly challenging chemical reactions involve selective oxidation reactions, such as the selective oxidation of methane by oxygen. On the other hand some important oxidation reactions, such as the aerobic oxidation of alcohols in the liquid phase and the preferential oxidation of carbon monoxide in hydrogen, have attracted much attention in recent years because of their high significance in green or energy chemistry. This article summarizes recent advances in the development of new catalytic materials or novel catalytic systems for these challenging oxidation reactions. A deep scientific understanding of the mechanisms, active species and active structures for these systems are also discussed. Furthermore, connections among these distinct catalytic oxidation systems are highlighted, to gain insight for the breakthrough in rational design of efficient catalytic systems for challenging oxidation reactions.
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Affiliation(s)
- Zhen Guo
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore.
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207
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Liu J, Liu W, Sun Q, Wang S, Sun K, Schwank J, Wang R. In situ tracing of atom migration in Pt/NiPt hollow spheres during catalysis of CO oxidation. Chem Commun (Camb) 2014; 50:1804-7. [PMID: 24413221 DOI: 10.1039/c3cc47772j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
NiPt hollow spheres decorated by Pt nanoparticles were synthesized by a facile wet chemical route through galvanic replacement. In situ STEM imaging and 3D reconstruction were performed to evidence the migration of Pt atoms during catalysis of CO oxidation, providing a practical insight into the structural stability of bimetallic catalysts.
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Affiliation(s)
- Jialong Liu
- Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, P. R. China.
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208
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Ramaker DE, Korovina A, Croze V, Melke J, Roth C. Following ORR intermediates adsorbed on a Pt cathode catalyst during break-in of a PEM fuel cell by in operando X-ray absorption spectroscopy. Phys Chem Chem Phys 2014; 16:13645-53. [DOI: 10.1039/c4cp00192c] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In operando X-ray absorption spectroscopy data using the Δμ X-ray Absorption Near Edge Spectroscopy (XANES) analysis procedure is used to follow the ORR intermediate adsorbate coverage on a working catalyst in a PEMFC during initial activation and break-in.
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Affiliation(s)
- D. E. Ramaker
- Chemistry Dept
- George Washington University
- Washington, USA
| | - A. Korovina
- Chemistry Dept
- George Washington University
- Washington, USA
| | - V. Croze
- Institute for Materials Science
- Technische Universität Darmstadt
- Darmstadt, Germany
| | - J. Melke
- Institute for Materials Science
- Technische Universität Darmstadt
- Darmstadt, Germany
| | - C. Roth
- Institute for Materials Science
- Technische Universität Darmstadt
- Darmstadt, Germany
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209
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Physico-Chemical Characteristics of Gold Nanoparticles. GOLD NANOPARTICLES IN ANALYTICAL CHEMISTRY 2014. [DOI: 10.1016/b978-0-444-63285-2.00003-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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210
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Jinschek JR. Advances in the environmental transmission electron microscope (ETEM) for nanoscale in situ studies of gas–solid interactions. Chem Commun (Camb) 2014; 50:2696-706. [DOI: 10.1039/c3cc49092k] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
This review highlights how ETEM technology advances have enabled new essential (structural) information that improve our understanding of nanomaterials' structure–property–function relationships.
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Affiliation(s)
- J. R. Jinschek
- FEI Company
- Materials Science BU
- Eindhoven, The Netherlands
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211
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Gitis V, Beerthuis R, Shiju NR, Rothenberg G. Organosilane oxidation by water catalysed by large gold nanoparticles in a membrane reactor. Catal Sci Technol 2014. [DOI: 10.1039/c3cy00506b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Go large! Surprisingly, “large” gold nanoparticles (6–18 nm in diameter) are just as effective as small ones in catalysing the oxidation of organosilanes to silanols. These catalysts are easily separated using ultrafiltration ceramic membranes.
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Affiliation(s)
- Vitaly Gitis
- Van 't Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1098XH Amsterdam, The Netherlands
- Unit of Environmental Engineering
- Ben-Gurion University of the Negev
| | - Rolf Beerthuis
- Van 't Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1098XH Amsterdam, The Netherlands
| | - N. Raveendran Shiju
- Van 't Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1098XH Amsterdam, The Netherlands
| | - Gadi Rothenberg
- Van 't Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1098XH Amsterdam, The Netherlands
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212
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An estimation of molecular dynamic behaviour in a liquid using core-loss spectroscopy. Sci Rep 2013; 3:3503. [PMID: 24356101 PMCID: PMC3868954 DOI: 10.1038/srep03503] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 11/19/2013] [Indexed: 01/07/2023] Open
Abstract
We report an effective approach for estimating the dynamic behaviour of molecules in liquid from their core-loss spectra by combining molecular dynamics simulations and first-principles band-structure calculations. The carbon K-edge of the technologically important methanol was calculated, and the experimental spectra were well reproduced using the presented calculation method, which effectively included multiple-molecule interactions. Several peaks arose from the methanol molecules with different C-O bonding modes, and the splitting of those peaks was sensitively altered by the magnitude of the dynamic behaviour of molecules. These findings allow for estimation of the dynamic behaviour of molecules in liquids using core-loss spectroscopy, and the method offers the potential to identify the dynamic behaviour of the molecules in liquids with high spatial resolution, temporal resolution, and sensitivity.
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213
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Xin HL, Niu K, Alsem DH, Zheng H. In situ TEM study of catalytic nanoparticle reactions in atmospheric pressure gas environment. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2013; 19:1558-1568. [PMID: 24011167 DOI: 10.1017/s1431927613013433] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The understanding of solid-gas interactions has been greatly advanced over the past decade on account of the availability of high-resolution transmission electron microscopes (TEMs) equipped with differentially pumped environmental cells. The operational pressures in these differentially pumped environmental TEM (DP-ETEM) instruments are generally limited up to 20 mbar. Yet, many industrial catalytic reactions are operated at pressures equal or higher than 1 bar-50 times higher than that in the DP-ETEM. This poses limitations for in situ study of gas reactions through ETEM and advances are needed to extend in situ TEM study of gas reactions to the higher pressure range. Here, we present a first series of experiments using a gas flow membrane cell TEM holder that allows a pressure up to 4 bar. The built-in membrane heaters enable reactions at a temperature of 95-400°C with flowing reactive gases. We demonstrate that, using a conventional thermionic TEM, 2 Å atomic fringes can be resolved with the presence of 1 bar O2 gases in an environmental cell and we show real-time observation of the Kirkendall effect during oxidation of cobalt nanocatalysts.
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Affiliation(s)
- Huolin L Xin
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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214
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Wang A, Liu XY, Mou CY, Zhang T. Understanding the synergistic effects of gold bimetallic catalysts. J Catal 2013. [DOI: 10.1016/j.jcat.2013.08.023] [Citation(s) in RCA: 123] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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215
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DeLaRiva AT, Hansen TW, Challa SR, Datye AK. In situ Transmission Electron Microscopy of catalyst sintering. J Catal 2013. [DOI: 10.1016/j.jcat.2013.08.018] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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216
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Qiao ZA, Wu Z, Dai S. Shape-controlled ceria-based nanostructures for catalysis applications. CHEMSUSCHEM 2013; 6:1821-1833. [PMID: 24115732 DOI: 10.1002/cssc.201300428] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Indexed: 06/02/2023]
Abstract
Among oxide catalysts, ceria is a technologically important material because of its wide applications as a promoter in three-way catalysts for the elimination of toxic exhaust gases, low-temperature water-gas-shift reaction, oxygen sensors, oxygen permeation membrane systems, and fuel cells. The catalytic activities of cerium oxide are highly dependent on interfacial structures and nanocrystal morphologies. This Minireview highlights the recent progress in the research of ceria nanoshapes as both catalysts and catalyst supports, including the synthesis, structure characterization, catalytic properties, surface chemistry, as well as reaction mechanisms. Insights from in situ spectroscopy study and theoretical modeling of nanostructured ceria-based materials have shed light on the origin of the ceria shape effect. It is suggested that the surface structure of ceria controls the catalytic activity and selectivity through structure-dependent surface-site geometry, surface vacancy formation energy, defect sites, and coordinatively unsaturated sites on ceria. The morphology-dependent catalysis in ceria has offered a new strategy to finely tune the catalytic activity and selectivity through shape control without altering the catalyst composition. A brief summary and an outlook on this research field will be presented at the end.
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Affiliation(s)
- Zhen-An Qiao
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge; TN 37831 (USA), Fax: (+1) 865-576-5235
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217
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Li L, Wang LL, Johnson DD, Zhang Z, Sanchez SI, Kang JH, Nuzzo RG, Wang Q, Frenkel AI, Li J, Ciston J, Stach EA, Yang JC. Noncrystalline-to-crystalline transformations in Pt nanoparticles. J Am Chem Soc 2013; 135:13062-72. [PMID: 23869582 DOI: 10.1021/ja405497p] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We show that the noncrystalline-to-crystalline transition of supported Pt nanoparticles (NPs) in the subnanometer to nanometer size range is statistical in nature, and strongly affected by particle size, support, and adsorbates (here we use H2). Unlike in the bulk, a noncrystalline phase exists and is stable in small NPs, reflecting a general mesoscopic feature. Observations of >3000 particles by high-resolution transmission electron microscopy show a noncrystalline-to-crystalline transition zone that is nonabrupt; there is a size regime where disordered and ordered NPs coexist. The NP size at which this transition occurs is strongly dependent on both the adsorbate and the support, and this effect is general for late 5d transition metals. All results are reconciled via a statistical description of particle-support-adsorbate interactions.
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Affiliation(s)
- Long Li
- Chemical and Petroleum Engineering, and Physics, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
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218
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Akita T, Kohyama M, Haruta M. Electron microscopy study of gold nanoparticles deposited on transition metal oxides. Acc Chem Res 2013; 46:1773-82. [PMID: 23777292 DOI: 10.1021/ar300259n] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Many researchers have investigated the catalytic performance of gold nanoparticles (GNPs) supported on metal oxides for various catalytic reactions of industrial importance. These studies have consistently shown that the catalytic activity and selectivity depend on the size of GNPs, the kind of metal oxide supports, and the gold/metal oxide interface structure. Although researchers have proposed several structural models for the catalytically active sites and have identified the specific electronic structures of GNPs induced by the quantum effect, recent experimental and theoretical studies indicate that the perimeter around GNPs in contact with the metal oxide supports acts as an active site in many reactions. Thus, it is of immense importance to investigate the detailed structures of the perimeters and the contact interfaces of gold/metal oxide systems by using electron microscopy at an atomic scale. This Account describes our investigation, at the atomic scale using electron microscopy, of GNPs deposited on metal oxides. In particular, high-resolution transmission electron microscopy (HRTEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) are valuable tools to observe local atomic structures, as has been successfully demonstrated for various nanoparticles, surfaces, and material interfaces. TEM can be applied to real powder catalysts as received without making special specimens, in contrast to what is typically necessary to observe bulk materials. For precise structure analyses at an atomic scale, model catalysts prepared by using well-defined single-crystalline substrates are also adopted for TEM observations. Moreover, aberration-corrected TEM, which has high spatial resolution under 0.1 nm, is a promising tool to observe the interface structure between GNPs and metal oxide supports including oxygen atoms at the interfaces. The oxygen atoms in particular play an important role in the behavior of gold/metal oxide interfaces, because they may participate in catalytic reaction steps. Detailed information about the interfacial structures between GNPs and metal oxides provides valuable structure models for theoretical calculations which can elucidate the local electronic structure effective for activating a reactant molecule. Based on our observations with HRTEM and HAADF-STEM, we report the detailed structure of gold/metal oxide interfaces.
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Affiliation(s)
- Tomoki Akita
- Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Masanori Kohyama
- Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Masatake Haruta
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 minami-osawa, Hachioji, Tokyo 192-0397, Japan
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219
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Zhang S, Nguyen L, Zhu Y, Zhan S, Tsung CK(F, Tao F(F. In-situ studies of nanocatalysis. Acc Chem Res 2013; 46:1731-9. [PMID: 23618394 DOI: 10.1021/ar300245g] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A heterogeneous catalyst in industry consists of nanoparticles with variable crystallite sizes, shapes, and compositions. Its catalytic performance (activity, selectivity, and durability) derives from surface chemistry of catalyst nanoparticles during catalysis. However, the surface chemistry of the catalyst particles during catalysis, termed in-situ information, is a "black box" because of the challenges in characterizing the catalysts during catalysis. The lack of such in-situ information about catalysts has limited the understanding of catalytic mechanisms and the development of catalysts with high selectivity and activity. The challenges in understanding heterogeneous catalysis include measurement of reaction kinetics, identification of reaction intermediates, bridging pressure gap and materials gap. The pressure gap is the difference in surface structure and chemistry between a catalyst during catalysis and under an ultrahigh vacuum (UHV) condition. The materials gap represents the difference between the structural and compositional complexity of industrial catalysts and the well-defined surface of model catalysts of metals or oxides. Development of in-situ characterization using electron spectroscopy and electron microscopy in recent decades has made possible studies of surface chemistry and structure of nanocatalysts under reaction conditions or during catalysis at near ambient pressure. In this Account, we review the new chemistries and structures of nanocatalysts during reactions revealed with in-situ analytical techniques. We discuss changes observed during catalysis including the evolution of composition, oxidation state, phase, and geometric structure of the catalyst surface, and the sintering of catalysts. These surface chemistries and structures have allowed researchers to build a correlation between surface chemistry and structure of active nanocatalysts and their corresponding catalytic performances. Such a correlation provides critical insights for understanding catalysis, optimization of existing nanocatalysts, and development of new nanocatalysts with high activity and selectivity.
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Affiliation(s)
- Shiran Zhang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Luan Nguyen
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Yuan Zhu
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Sihui Zhan
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | | | - Franklin (Feng) Tao
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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220
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Kuwauchi Y, Takeda S, Yoshida H, Sun K, Haruta M, Kohno H. Stepwise displacement of catalytically active gold nanoparticles on cerium oxide. NANO LETTERS 2013; 13:3073-3077. [PMID: 23786232 DOI: 10.1021/nl400919c] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Aberration-corrected environmental transmission electron microscopy (ETEM) proved that catalytically active gold nanoparticles (AuNPs) move reversibly and stepwise by approximately 0.09 nm on a cerium oxide (CeO2) support surface at room temperature and in a reaction environment. The lateral displacements and rotations occur back and forth between equivalent sites, indicating that AuNPs are loosely bound to oxygen-terminated CeO2 and may migrate on the surface with low activation energy. The AuNPs are likely anchored to oxygen-deficient sites. Observations indicate that the most probable activation sites in gold nanoparticulate catalysts, which are the perimeter interfaces between an AuNP and a support, are not structurally rigid.
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Affiliation(s)
- Yasufumi Kuwauchi
- The Institute of Scientific and Industrial Research, Osaka University , 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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221
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222
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Tuning the shape of ceria nanomaterials for catalytic applications. CHINESE JOURNAL OF CATALYSIS 2013. [DOI: 10.1016/s1872-2067(12)60573-7] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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223
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Wu J, Li P, Pan YTF, Warren S, Yin X, Yang H. Surface lattice-engineered bimetallic nanoparticles and their catalytic properties. Chem Soc Rev 2013; 41:8066-74. [PMID: 23104135 DOI: 10.1039/c2cs35189g] [Citation(s) in RCA: 221] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
When nanoparticles become small (ca. <5 nm), surface stress becomes significant and generates strain that results in a change of surface structures. In this regard, the surface lattice of nanoparticles can be engineered to create strains or other structural changes with atomic positions away from the normal lattice points. Such changes impact the electronic and catalytic properties of nanoparticles. Recently, several groups have reported the change of catalytic and electrocatalytic properties of bimetallic nanoparticles. In this tutorial review, we discuss the principles related to lattice strain and other distorted structures, and the catalytic properties of bimetallic nanostructures.
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Affiliation(s)
- Jianbo Wu
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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224
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Yang JC, Small MW, Grieshaber RV, Nuzzo RG. Recent developments and applications of electron microscopy to heterogeneous catalysis. Chem Soc Rev 2013; 41:8179-94. [PMID: 23120754 DOI: 10.1039/c2cs35371g] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) are popular and powerful techniques used to characterize heterogeneous catalysts. Rapid developments in electron microscopy--especially aberration correctors and in situ methods--permit remarkable capabilities for visualizing both morphologies and atomic and electronic structures. The purpose of this review is to summarize the significant developments and achievements in this field with particular emphasis on the characterization of catalysts. We also highlight the potential and limitations of the various methods, describe the need for synergistic and complementary tools when characterizing heterogeneous catalysts, and conclude with an outlook that also envisions future needs in the field.
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Affiliation(s)
- Judith C Yang
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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225
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Tao FF, Nguyen L, Zhang S. Design of a new reactor-like high temperature near ambient pressure scanning tunneling microscope for catalysis studies. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:034101. [PMID: 23556828 DOI: 10.1063/1.4792673] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Here, we present the design of a new reactor-like high-temperature near ambient pressure scanning tunneling microscope (HT-NAP-STM) for catalysis studies. This HT-NAP-STM was designed for exploration of structures of catalyst surfaces at atomic scale during catalysis or under reaction conditions. In this HT-NAP-STM, the minimized reactor with a volume of reactant gases of ∼10 ml is thermally isolated from the STM room through a shielding dome installed between the reactor and STM room. An aperture on the dome was made to allow tip to approach to or retract from a catalyst surface in the reactor. This dome minimizes thermal diffusion from hot gas of the reactor to the STM room and thus remains STM head at a constant temperature near to room temperature, allowing observation of surface structures at atomic scale under reaction conditions or during catalysis with minimized thermal drift. The integrated quadrupole mass spectrometer can simultaneously measure products during visualization of surface structure of a catalyst. This synergy allows building an intrinsic correlation between surface structure and its catalytic performance. This correlation offers important insights for understanding of catalysis. Tests were done on graphite in ambient environment, Pt(111) in CO, graphene on Ru(0001) in UHV at high temperature and gaseous environment at high temperature. Atom-resolved surface structure of graphene on Ru(0001) at 500 K in a gaseous environment of 25 Torr was identified.
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Affiliation(s)
- Franklin Feng Tao
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
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226
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Suzuki M, Yaguchi T, Zhang XF. High-resolution environmental transmission electron microscopy: modeling and experimental verification. Microscopy (Oxf) 2013; 62:437-50. [DOI: 10.1093/jmicro/dft001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Takeda S, Yoshida H. Atomic-resolution environmental TEM for quantitativein-situmicroscopy in materials science. Microscopy (Oxf) 2013; 62:193-203. [DOI: 10.1093/jmicro/dfs096] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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229
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Cui Y, Huang K, Nilius N, Freund HJ. Charge competition with oxygen molecules determines the growth of gold particles on doped CaO films. Faraday Discuss 2013; 162:153-63. [DOI: 10.1039/c3fd20130a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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230
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Song W, Jansen APJ, Degirmenci V, Ligthart DAJM, Hensen EJM. A computational study of the mechanism of CO oxidation by a ceria supported surface rhodium oxide layer. Chem Commun (Camb) 2013; 49:3851-3. [DOI: 10.1039/c3cc40670a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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231
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Rodriguez JA, Hanson JC, Stacchiola D, Senanayake SD. In situ/operando studies for the production of hydrogen through the water-gas shift on metal oxide catalysts. Phys Chem Chem Phys 2013; 15:12004-25. [DOI: 10.1039/c3cp50416f] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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232
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Saint-Lager MC, Laoufi I, Bailly A. Operando atomic structure and active sites of TiO2(110)-supported gold nanoparticles during carbon monoxide oxidation. Faraday Discuss 2013; 162:179-90. [DOI: 10.1039/c2fd20157g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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233
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Influence of total beam current on HRTEM image resolution in differentially pumped ETEM with nitrogen gas. Ultramicroscopy 2013; 124:46-51. [DOI: 10.1016/j.ultramic.2012.08.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Revised: 06/27/2012] [Accepted: 08/14/2012] [Indexed: 11/19/2022]
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234
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Song W, Jansen APJ, Hensen EJM. A computational study of the influence of the ceria surface termination on the mechanism of CO oxidation of isolated Rh atoms. Faraday Discuss 2013; 162:281-92. [DOI: 10.1039/c3fd20129e] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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235
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Zeng Z, Björketun ME, Ebbesen S, Mogensen MB, Rossmeisl J. Origin of electrolyte-dopant dependent sulfur poisoning of SOFC anodes. Phys Chem Chem Phys 2013; 15:6769-72. [DOI: 10.1039/c3cp51099a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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236
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Oliver-Meseguer J, Cabrero-Antonino JR, Domínguez I, Leyva-Pérez A, Corma A. Small gold clusters formed in solution give reaction turnover numbers of 10(7) at room temperature. Science 2012; 338:1452-5. [PMID: 23239732 DOI: 10.1126/science.1227813] [Citation(s) in RCA: 354] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Very small gold clusters (3 to 10 atoms) formed from conventional gold salts and complexes can catalyze various organic reactions at room temperature, even when present at concentrations of parts per billion. Absorption and emission ultraviolet-visible spectroscopy and matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry revealed that, for example, the ester-assisted hydration of alkynes began only when clusters of three to five gold atoms were formed. The turnover numbers and turnover frequencies associated with these catalyzed reactions can be as high as 10(7) and 10(5) per hour, respectively.
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Affiliation(s)
- Judit Oliver-Meseguer
- Instituto de Tecnología Química, Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
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Ta N, Liu J(J, Chenna S, Crozier PA, Li Y, Chen A, Shen W. Stabilized Gold Nanoparticles on Ceria Nanorods by Strong Interfacial Anchoring. J Am Chem Soc 2012; 134:20585-8. [DOI: 10.1021/ja310341j] [Citation(s) in RCA: 299] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Na Ta
- State Key Laboratory of Catalysis,
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jingyue (Jimmy) Liu
- State Key Laboratory of Catalysis,
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | | | | | - Yong Li
- State Key Laboratory of Catalysis,
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Aling Chen
- State Key Laboratory of Catalysis,
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Wenjie Shen
- State Key Laboratory of Catalysis,
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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238
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Yang DS, Mohammed OF, Zewail AH. Environmental Scanning Ultrafast Electron Microscopy: Structural Dynamics of Solvation at Interfaces. Angew Chem Int Ed Engl 2012; 52:2897-901. [DOI: 10.1002/anie.201205093] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 11/13/2012] [Indexed: 11/10/2022]
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239
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Yang DS, Mohammed OF, Zewail AH. Environmental Scanning Ultrafast Electron Microscopy: Structural Dynamics of Solvation at Interfaces. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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240
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Grunwaldt JD, Wagner JB, Dunin-Borkowski RE. Imaging Catalysts at Work: A Hierarchical Approach from the Macro- to the Meso- and Nano-scale. ChemCatChem 2012. [DOI: 10.1002/cctc.201200356] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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241
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Tejel C, Sancho S, López JA, Ciriano MA. Aerobic Oxidation of Carbon Monoxide in a Tetrametallic Complex. Chemistry 2012; 18:15250-3. [DOI: 10.1002/chem.201202834] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Revised: 09/16/2012] [Indexed: 11/06/2022]
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242
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Yoshida H, Kohno H, Takeda S. In situ structural analysis of crystalline Fe–Mo–C nanoparticle catalysts during the growth of carbon nanotubes. Micron 2012; 43:1176-80. [DOI: 10.1016/j.micron.2012.04.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 02/13/2012] [Accepted: 04/19/2012] [Indexed: 11/29/2022]
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243
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Arslan I, Stach EA. Electron tomography: seeing atoms in three dimensions. NATURE MATERIALS 2012; 11:911-912. [PMID: 23089992 DOI: 10.1038/nmat3472] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- Ilke Arslan
- Pacific Northwest National Laboratory, Richland, Washington 993352, USA.
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244
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Costa NJS, Rossi LM. Synthesis of supported metal nanoparticle catalysts using ligand assisted methods. NANOSCALE 2012; 4:5826-5834. [PMID: 22915064 DOI: 10.1039/c2nr31165h] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The synthesis and characterization methods of metal nanoparticles (NPs) have advanced greatly in the last few decades, allowing an increasing understanding of structure-property-performance relationships. However, the role played by the ligands used as stabilizers for metal NPs synthesis or for NPs immobilization on solid supports has been underestimated. Here, we highlight some recent progress in the preparation of supported metal NPs with the assistance of ligands in solution or grafted on solid supports, a modified deposition-reduction method, with special attention to the effects on NPs size, metal-support interactions and, more importantly, catalytic activities. After presenting the general strategies in metal NP synthesis assisted by ligands grafted on solid supports, we highlight some recent progress in the deposition of pre-formed colloidal NPs on functionalized solids. Another important aspect that will be reviewed is related to the separation and recovery of NPs. Finally, we will outline our personal understanding and perspectives on the use of supported metal NPs prepared through ligand-assisted methods.
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Affiliation(s)
- Natalia J S Costa
- Instituto de Quimica, Universidade de Sao Paulo, 05508-000, Sao Paulo, Brazil
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245
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246
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Stratakis M, Garcia H. Catalysis by supported gold nanoparticles: beyond aerobic oxidative processes. Chem Rev 2012; 112:4469-506. [PMID: 22690711 DOI: 10.1021/cr3000785] [Citation(s) in RCA: 546] [Impact Index Per Article: 45.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Manolis Stratakis
- Department of Chemistry, University of Crete, 71003 Voutes, Iraklion, Greece.
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247
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Tao F(F, Zhang S, Nguyen L, Zhang X. Action of bimetallic nanocatalysts under reaction conditions and during catalysis: evolution of chemistry from high vacuum conditions to reaction conditions. Chem Soc Rev 2012; 41:7980-93. [DOI: 10.1039/c2cs35185d] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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248
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249
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Tao F(F. Synthesis, catalysis, surface chemistry and structure of bimetallic nanocatalysts. Chem Soc Rev 2012; 41:7977-9. [DOI: 10.1039/c2cs90093a] [Citation(s) in RCA: 149] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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