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Blackman K, Segrest E, Turner G, Machamer K, Gupta A, Khan Pathan MA, Berriel SN, Banerjee P, Vaida ME. Simultaneous tracking of ultrafast surface and gas-phase dynamics in solid-gas interfacial reactions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:083003. [PMID: 39133084 DOI: 10.1063/5.0217441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Accepted: 07/21/2024] [Indexed: 08/13/2024]
Abstract
Real-time detection of intermediate species and final products at the surface and near-surface in interfacial solid-gas reactions is critical for an accurate understanding of heterogeneous reaction mechanisms. In this article, an experimental method that can simultaneously monitor the ultrafast dynamics at the surface and above the surface in photoinduced heterogeneous reactions is presented. This method relies on a combination of mass spectrometry and femtosecond pump-probe spectroscopy. As a model system, the photoinduced reaction of methyl iodide on and above a cerium oxide surface is investigated. The species that are simultaneously detected from the surface and gas-phase present distinct features in the mass spectra, such as a sharp peak followed by an adjacent broad shoulder. The sharp peak is attributed to the species detected from the surface, while the broad shoulder is due to the detection of gas-phase species above the surface, as confirmed by multiple experiments. By monitoring the evolution of the sharp peak and broad shoulder as a function of the pump-probe time delay, transient signals are obtained that describe the ultrafast photoinduced reaction dynamics of methyl iodide on the surface and in the gas-phase. Finally, SimION simulations are performed to confirm the origin of the ions produced on the surface and in the gas-phase.
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Affiliation(s)
- Keith Blackman
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - Eric Segrest
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - George Turner
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - Kai Machamer
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - Aakash Gupta
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - Md Afjal Khan Pathan
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - S Novia Berriel
- Department of Material Science and Engineering, University of Central Florida, Orlando, Florida 32816, USA
| | - Parag Banerjee
- Department of Material Science and Engineering, University of Central Florida, Orlando, Florida 32816, USA
- Nano Science and Technology Center, University of Central Florida, Orlando, Florida 32816, USA
- Florida Solar Energy Center, University of Central Florida, Orlando, Florida 32816, USA
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, Orlando, Florida 32816, USA
| | - Mihai E Vaida
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, Orlando, Florida 32816, USA
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Chai P, Wu Z, Wu L, Wang H, Fu C, Huang W. An Operando Study of H 2O-Enhanced Low-Temperature CO Oxidation on Pt(111) under Near Ambient Pressure Conditions. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peng Chai
- Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Zongfang Wu
- Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Longxia Wu
- Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Haocheng Wang
- Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Cong Fu
- Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Weixin Huang
- Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
- Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, P. R. China
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A Ziegler-type spherical cap model reveals early stage ethylene polymerization growth versus catalyst fragmentation relationships. Nat Commun 2022; 13:4954. [PMID: 36002458 PMCID: PMC9402950 DOI: 10.1038/s41467-022-32635-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 08/09/2022] [Indexed: 11/24/2022] Open
Abstract
Polyolefin catalysts are characterized by their hierarchically complex nature, which complicates studies on the interplay between the catalyst and formed polymer phases. Here, the missing link in the morphology gap between planar model systems and industrially relevant spherical catalyst particles is introduced through the use of a spherical cap Ziegler-type catalyst model system for the polymerization of ethylene. More specifically, a moisture-stable LaOCl framework with enhanced imaging contrast has been designed to support the TiCl4 pre-active site, which could mimic the behaviour of the highly hygroscopic and industrially used MgCl2 framework. As a function of polymerization time, the fragmentation behaviour of the LaOCl framework changed from a mixture of the shrinking core (i.e., peeling off small polyethylene fragments at the surface) and continuous bisection (i.e., internal cleavage of the framework) into dominantly a continuous bisection model, which is linked to the evolution of the estimated polyethylene volume and the fraction of crystalline polyethylene formed. The combination of the spherical cap model system and the used advanced micro-spectroscopy toolbox, opens the route for high-throughput screening of catalyst functions with industrially relevant morphologies on the nano-scale. Ziegler-type polyolefin catalysts have proven to be hard to characterize. Here the authors present a model system consisting of patterned LaOCl spherical caps, simulating bulk particles while facilitating the use of micro(-spectro)scopic characterization techniques specifically aimed at surfaces.
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Vecchietti J, Pérez-Bailac P, Lustemberg PG, Fornero EL, Pascual L, Bosco MV, Martínez-Arias A, Ganduglia-Pirovano MV, Bonivardi AL. Shape-Controlled Pathways in the Hydrogen Production from Ethanol Steam Reforming over Ceria Nanoparticles. ACS Catal 2022; 12:10482-10498. [PMID: 36033370 PMCID: PMC9396663 DOI: 10.1021/acscatal.2c02117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 07/26/2022] [Indexed: 11/29/2022]
Abstract
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The ethanol surface reaction over CeO2 nanooctahedra
(NO) and nanocubes (NC), which mainly expose (111) and (100) surfaces,
respectively, was studied by means of infrared spectroscopy (TPSR-IR),
mass spectrometry (TPSR-MS), and density functional theory (DFT) calculations.
TPSR-MS results show that the production of H2 is 2.4 times
higher on CeO2-NC than on CeO2-NO, which is
rationalized starting from the different types of adsorbed ethoxy
species controlled by the shape of the ceria particles. Over the CeO2(111) surface, monodentate type I and II ethoxy species with
the alkyl chain perpendicular or parallel to the surface, respectively,
were identified. Meanwhile, on the CeO2(100) surface, bidentate
and monodentate type III ethoxy species on the checkerboard O-terminated
surface and on a pyramid of the reconstructed (100) surface, respectively,
are found. The more labile surface ethoxy species on each ceria nanoshape,
which are the monodentate type I or III ethoxy on CeO2-NO
and CeO2-NC, respectively, react on the surface to give
acetate species that decompose to CO2 and CH4, while H2 is formed via the recombination of hydroxyl
species. In addition, the more stable monodentate type II and bidentate
ethoxy species on CeO2-NO and CeO2-NC, respectively,
give an ethylenedioxy intermediate, the binding of which is facet-dependent.
On the (111) facet, the less strongly bound ethylenedioxy desorbs
as ethylene, whereas on the (100) facet, the more strongly bound intermediate
also produces CO2 and H2 via formate species.
Thus, on the (100) facet, an additional pathway toward H2 formation is found. ESR activity measurements show an enhanced H2 production on the nanocubes.
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Affiliation(s)
- Julia Vecchietti
- Instituto de Desarrollo Tecnológico para la Industria Química, UNL-CONICET, Güemes 3450, 3000 Santa Fe, Argentina
| | - Patricia Pérez-Bailac
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, 28049 Madrid, Spain
- PhD Programme in Applied Chemistry, Doctoral School, Universidad Autónoma de Madrid, C/Francisco Tomas y Valiente 2, 28049 Madrid, Spain
| | - Pablo G. Lustemberg
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, 28049 Madrid, Spain
- Instituto de Física Rosario (IFIR), CONICET-UNR, Bv. 27 de Febrero 210bis, 2000EZP Rosario, Santa Fe, Argentina
| | - Esteban L. Fornero
- Instituto de Desarrollo Tecnológico para la Industria Química, UNL-CONICET, Güemes 3450, 3000 Santa Fe, Argentina
| | - Laura Pascual
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, 28049 Madrid, Spain
| | - Marta V. Bosco
- Instituto de Desarrollo Tecnológico para la Industria Química, UNL-CONICET, Güemes 3450, 3000 Santa Fe, Argentina
| | - Arturo Martínez-Arias
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, 28049 Madrid, Spain
| | | | - Adrian L. Bonivardi
- Instituto de Desarrollo Tecnológico para la Industria Química, UNL-CONICET, Güemes 3450, 3000 Santa Fe, Argentina
- Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina
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Zhu C, Liang JX, Wang YG, Li J. Non-noble metal single-atom catalyst with MXene support: Fe1/Ti2CO2 for CO oxidation. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)64027-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Gäßler M, Stahl J, Schowalter M, Pokhrel S, Rosenauer A, Mädler L, Güttel R. The Impact of Support Material of Cobalt‐Based Catalysts Prepared by Double Flame Spray Pyrolysis on CO2 Methanation Dynamics. ChemCatChem 2022. [DOI: 10.1002/cctc.202200286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Max Gäßler
- Ulm University: Universitat Ulm Institute of Chemical Engineering GERMANY
| | - Jakob Stahl
- University of Bremen: Universitat Bremen Faculty of Production Engineering GERMANY
| | - Marco Schowalter
- University of Bremen: Universitat Bremen Institute of Solid State Physics GERMANY
| | - Suman Pokhrel
- University of Bremen: Universitat Bremen Faculty of Production Engineering GERMANY
| | - Andreas Rosenauer
- University of Bremen: Universitat Bremen Institute of Solid State Physics GERMANY
| | - Lutz Mädler
- University of Bremen: Universitat Bremen Faculty of Production Engineering GERMANY
| | - Robert Güttel
- Universitat Ulm Institute of Chemical Process Engineering Albert-Einstein-Allee 11 89081 Ulm GERMANY
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Ghosh T, Liu X, Sun W, Chen M, Liu Y, Li Y, Mirsaidov U. Revealing the Origin of Low-Temperature Activity of Ni-Rh Nanostructures during CO Oxidation Reaction with Operando TEM. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2105599. [PMID: 35514057 PMCID: PMC9189651 DOI: 10.1002/advs.202105599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 03/30/2022] [Indexed: 06/14/2023]
Abstract
In bimetallic heterostructured nanoparticles (NPs), the synergistic effect between their different metallic components leads to higher catalytic activity compared to the activity of the individual components. However, how the dynamic changes through which these NPs adopt catalytically active structures during a reaction and how the restructuring affects their activity are largely unknown. Here, using operando transmission electron microscopy, structural changes are studied in bimetallic Ni-Rh NPs, comprising of a Ni core whose surface is decorated with smaller Rh NPs, during a CO oxidation reaction. The direct atomic-scale imaging reveals that, under O2 -rich conditions, Ni core partially transforms into NiO, forming a (Ni+NiO)-Rh hollow nanocatalyst with high catalytic activity. Under O2 -poor conditions, Rh NPs alloy with the surface of the core to form a NiRh-alloy surface, and the NPs display significantly lower activity. The theoretical calculations indicate that NiO component that forms only under O2 -rich conditions enhances the activity by preventing the CO poisoning of the nanocatalysts. The results demonstrate that visualizing the structural changes during reactions is indispensable in identifying the origin of catalytic activity. These insights into the dynamic restructuring of NP catalysts under a reactive environment are critical for the rational design of high-performance nanocatalysts.
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Affiliation(s)
- Tanmay Ghosh
- Department of PhysicsNational University of SingaporeSingapore117551Singapore
- Centre for BioImaging SciencesDepartment of Biological SciencesNational University of SingaporeSingapore117557Singapore
| | - Xiangwen Liu
- Department of PhysicsNational University of SingaporeSingapore117551Singapore
- Centre for BioImaging SciencesDepartment of Biological SciencesNational University of SingaporeSingapore117557Singapore
- Institute of Analysis and TestingBeijing Academy of Science and Technology (Beijing Center for Physical and Chemical Analysis)Beijing100094P. R. China
| | - Wenming Sun
- College of ScienceChina Agricultural UniversityBeijing100193P. R. China
| | - Meiqi Chen
- College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing100124P. R. China
| | - Yuxi Liu
- College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing100124P. R. China
| | - Yadong Li
- Department of ChemistryTsinghua UniversityBeijing100084P. R. China
| | - Utkur Mirsaidov
- Department of PhysicsNational University of SingaporeSingapore117551Singapore
- Centre for BioImaging SciencesDepartment of Biological SciencesNational University of SingaporeSingapore117557Singapore
- Centre for Advanced 2D Materials and Graphene Research CentreNational University of SingaporeSingapore117546Singapore
- Department of Materials Science and EngineeringNational University of SingaporeSingapore117575Singapore
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8
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Zaera F. Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts? Chem Rev 2022; 122:8594-8757. [PMID: 35240777 DOI: 10.1021/acs.chemrev.1c00905] [Citation(s) in RCA: 69] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A critical review of different prominent nanotechnologies adapted to catalysis is provided, with focus on how they contribute to the improvement of selectivity in heterogeneous catalysis. Ways to modify catalytic sites range from the use of the reversible or irreversible adsorption of molecular modifiers to the immobilization or tethering of homogeneous catalysts and the development of well-defined catalytic sites on solid surfaces. The latter covers methods for the dispersion of single-atom sites within solid supports as well as the use of complex nanostructures, and it includes the post-modification of materials via processes such as silylation and atomic layer deposition. All these methodologies exhibit both advantages and limitations, but all offer new avenues for the design of catalysts for specific applications. Because of the high cost of most nanotechnologies and the fact that the resulting materials may exhibit limited thermal or chemical stability, they may be best aimed at improving the selective synthesis of high value-added chemicals, to be incorporated in organic synthesis schemes, but other applications are being explored as well to address problems in energy production, for instance, and to design greener chemical processes. The details of each of these approaches are discussed, and representative examples are provided. We conclude with some general remarks on the future of this field.
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, United States
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9
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Kilian AS, Abreu GJP, de Siervo A, Landers R, Morais J. Evidencing the formation of Pt nano-islands on Cr2O3/Ag(111). CrystEngComm 2022. [DOI: 10.1039/d1ce01628h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work reports on a comprehensive surface atomic structure investigation on the Pt/Cr2O3/Ag(111) model catalyst. Molecular beam epitaxy (MBE) was applied to achieve the Pt/Cr2O3 model system and in...
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10
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Shen T, Yang Y, Xu X. Structure–Reactivity Relationship for Nano‐Catalysts in the Hydrogenation/Dehydrogenation Controlled Reaction Systems. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tonghao Shen
- Department of Chemistry Fudan University 200438 Shanghai China
| | - Yuqi Yang
- Department of Chemistry Fudan University 200438 Shanghai China
| | - Xin Xu
- Department of Chemistry Fudan University 200438 Shanghai China
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11
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Shen T, Yang Y, Xu X. Structure-Reactivity Relationship for Nano-Catalysts in the Hydrogenation/Dehydrogenation Controlled Reaction Systems. Angew Chem Int Ed Engl 2021; 60:26342-26345. [PMID: 34626058 DOI: 10.1002/anie.202109942] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 09/04/2021] [Indexed: 11/06/2022]
Abstract
For the activity of a nano-catalyst, a general and quantitative solution to building direct structure-reactivity relationship has not yet been established. On top of the first-principle-based kinetic Monte Carlo (KMC) simulations, we developed a model to build the adsorption site dependence of the activity. We applied this model to study the nano effects of Cu catalysts in the water-gas shift reaction. By accumulating the activities of different adsorption sites, our model satisfactorily reproduced the experimental apparent activation energies for catalysts with sizes over hundreds of nanometers, which were out of reach for conventional KMC simulations. Our results disclose that, even for a cubic catalyst with size of 877 nm, its activity can still be closely related to the activity of edge sites, instead of only the exposed Cu(100) facets as might be expected. The present model is expected to be useful for systems that are controlled by the hydrogenation/dehydrogenation processes.
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Affiliation(s)
- Tonghao Shen
- Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Yuqi Yang
- Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Xin Xu
- Department of Chemistry, Fudan University, 200438, Shanghai, China
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12
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In-situ and operando spectroscopies for the characterization of catalysts and of mechanisms of catalytic reactions. J Catal 2021. [DOI: 10.1016/j.jcat.2021.08.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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14
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Zhao W, Li Y, Shen W. Tuning the shape and crystal phase of TiO 2 nanoparticles for catalysis. Chem Commun (Camb) 2021; 57:6838-6850. [PMID: 34137748 DOI: 10.1039/d1cc01523k] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Synthesis of TiO2 nanoparticles with tunable shape and crystal phase has attracted considerable attention for the design of highly efficient heterogeneous catalysts. Tailoring the shape of TiO2, in the crystal phases of anatase, rutile, brookite and TiO2(B), allows tuning of the atomic configurations on the dominantly exposed facets for maximizing the active sites and regulating the reaction route towards a specific channel for achieving high selectivity. Moreover, the shape and crystal phase of TiO2 nanoparticles alter their interactions with metal species, which are commonly termed as strong metal-support interactions involving interfacial strain and charge transfer. On the other hand, metal particles, clusters and single atoms interact differently with TiO2, because of the variation of the electronic structure, while the surface of TiO2 determines the interfacial bonding via a geometric effect. The dynamic behavior of the metal-titania interfaces, driven by the chemisorption of the reactive molecules at elevated temperatures, also plays a decisive role in elaborating the structure-reactivity relationship.
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Affiliation(s)
- Wenning Zhao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yong Li
- 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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Filie A, Shirman T, Aizenberg M, Aizenberg J, Friend CM, Madix RJ. The dynamic behavior of dilute metallic alloy PdxAu1−x/SiO2 raspberry colloid templated catalysts under CO oxidation. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00469g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Dilute palladium-in-gold alloys have potential as efficient oxidation catalysts; controlling the Pd surface distribution is critical.
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Affiliation(s)
- Amanda Filie
- John A. Paulson School of Engineering and Applied Sciences
- Harvard University
- Cambridge
- USA
| | - Tanya Shirman
- John A. Paulson School of Engineering and Applied Sciences
- Harvard University
- Cambridge
- USA
| | - Michael Aizenberg
- John A. Paulson School of Engineering and Applied Sciences
- Harvard University
- Cambridge
- USA
| | - Joanna Aizenberg
- John A. Paulson School of Engineering and Applied Sciences
- Harvard University
- Cambridge
- USA
- Department of Chemistry and Chemical Biology
| | - Cynthia M. Friend
- John A. Paulson School of Engineering and Applied Sciences
- Harvard University
- Cambridge
- USA
- Department of Chemistry and Chemical Biology
| | - Robert J. Madix
- John A. Paulson School of Engineering and Applied Sciences
- Harvard University
- Cambridge
- USA
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Quintanar C, Caballero R, Ugalde M, Ramos M, Chavira E, Cruz-Manjarrez H, Espinosa F. Charge transfer and hydrogen adsorption in the Pd/Ag bimetallic nano system: an experimental and theoretical DFT cluster approach. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1820090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- C. Quintanar
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, México México
| | - R. Caballero
- Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, México México
| | - M. Ugalde
- Banco de México, Evaluación de Insumos, Irrigación México
| | - M. Ramos
- Universidad Nacional Autónoma de México, Instituto de Investigaciones en Materiales, México México
| | - E. Chavira
- Universidad Nacional Autónoma de México, Instituto de Investigaciones en Materiales, México México
| | - H. Cruz-Manjarrez
- Universidad Nacional Autónoma de México, Instituto de Física, México México
| | - F. Espinosa
- Centro de Investigación en Materiales Avanzados, Física de Materiales, Chihuahua México
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Structural changes in noble metal nanoparticles during CO oxidation and their impact on catalyst activity. Nat Commun 2020; 11:2133. [PMID: 32358583 PMCID: PMC7195460 DOI: 10.1038/s41467-020-16027-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 04/06/2020] [Indexed: 11/08/2022] Open
Abstract
The dynamical structure of a catalyst determines the availability of active sites on its surface. However, how nanoparticle (NP) catalysts re-structure under reaction conditions and how these changes associate with catalytic activity remains poorly understood. Using operando transmission electron microscopy, we show that Pd NPs exhibit reversible structural and activity changes during heating and cooling in mixed gas environments containing O2 and CO. Below 400 °C, the NPs form flat low index facets and are inactive towards CO oxidation. Above 400 °C, the NPs become rounder, and conversion of CO to CO2 increases significantly. This behavior reverses when the temperature is later reduced. Pt and Rh NPs under similar conditions do not exhibit such reversible transformations. We propose that adsorbed CO molecules suppress the activity of Pd NPs at lower temperatures by stabilizing low index facets and reducing the number of active sites. This hypothesis is supported by thermodynamic calculations.
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de Alwis C, Leftwich TR, Perrine KA. New Approach to Simultaneous In Situ Measurements of the Air/Liquid/Solid Interface Using PM-IRRAS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3404-3414. [PMID: 32175739 DOI: 10.1021/acs.langmuir.9b03958] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Vibrational spectroscopy techniques have evolved to measure gases, liquids, and solids at surfaces and interfaces. In the field of surface-sensitive vibrational spectroscopy, infrared spectroscopy measures the adsorption on surfaces and changes from reactions. Previous polarized modulated-infrared reflection-absorption spectroscopy (PM-IRRAS) measurements at the gas/solid interface were developed to observe catalytic reactions near reaction conditions. Other PM-IRRAS measurements use liquid cells where the sample is submerged and compressed against a prism that has traditionally been used for electrochemical reactions. This article presents a new method that is used to observe in situ adsorption of molecules using PM-IRRAS at the gas/liquid/solid interface. We demonstrate the meniscus method by measuring the adsorption of octadecanethiol on gold surfaces. Characterization of self-assembled monolayers (SAMs), the "gold standard" for PM-IRRAS calibration measurements, was measured in ethanol solutions. The condensed-phase (air/liquid) interface in addition to the liquid/solid interface was measured simultaneously in solution. These are compared with liquid attenuated total reflectance (ATR)-Fourier transform infrared (FTIR) spectroscopy measurements to confirm the presence of the SAM and liquid ethanol. A model of the three-phase system is used to approximate the thickness of the liquid ethanol layer and correlate these values to signal attenuation using PM-IRRAS. This proof-of-concept study enables the measurement of reactions at the gas/liquid/solid interface that could be adapted for other reactions at the electrode and electrolyte interfaces with applications in environmental science and heterogeneous catalysis.
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20
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Gerber IC, Serp P. A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts. Chem Rev 2019; 120:1250-1349. [DOI: 10.1021/acs.chemrev.9b00209] [Citation(s) in RCA: 274] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Iann C. Gerber
- LPCNO, Université de Toulouse, CNRS, INSA, UPS, 135 avenue de Rangueil, F-31077 Toulouse, France
| | - Philippe Serp
- LCC-CNRS, Université de Toulouse, UPR 8241 CNRS, INPT, 31400 Toulouse, France
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21
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Klein J, Brimaud S, Engstfeld A, Behm R. Atomic scale insights on the electronic and geometric effects in the electro-oxidation of CO on PtxRu1-x/Ru(0001) surface alloys. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Korzyński MD, Consoli DF, Zhang S, Román-Leshkov Y, Dincă M. Activation of Methyltrioxorhenium for Olefin Metathesis in a Zirconium-Based Metal–Organic Framework. J Am Chem Soc 2018; 140:6956-6960. [DOI: 10.1021/jacs.8b02837] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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23
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Hübner O, Himmel HJ. Metal Cluster Models for Heterogeneous Catalysis: A Matrix-Isolation Perspective. Chemistry 2018; 24:8941-8961. [PMID: 29457854 DOI: 10.1002/chem.201706097] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Indexed: 01/25/2023]
Abstract
Metal cluster models are of high relevance for establishing new mechanistic concepts for heterogeneous catalysis. The high reactivity and particular selectivity of metal clusters is caused by the wealth of low-lying electronically excited states that are often thermally populated. Thereby the metal clusters are flexible with regard to their electronic structure and can adjust their states to be appropriate for the reaction with a particular substrate. The matrix isolation technique is ideally suited for studying excited state reactivity. The low matrix temperatures (generally 4-40 K) of the noble gas matrix host guarantee that all clusters are in their electronic ground-state (with only a very few exceptions). Electronically excited states can then be selectively populated and their reactivity probed. Unfortunately, a systematic research in this direction has not been made up to date. The purpose of this review is to provide the grounds for a directed approach to understand cluster reactivity through matrix-isolation studies combined with quantum chemical calculations.
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Affiliation(s)
- Olaf Hübner
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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24
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Chen BR, Crosby LA, George C, Kennedy RM, Schweitzer NM, Wen J, Van Duyne RP, Stair PC, Poeppelmeier KR, Marks LD, Bedzyk MJ. Morphology and CO Oxidation Activity of Pd Nanoparticles on SrTiO3 Nanopolyhedra. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04173] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bor-Rong Chen
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Lawrence A. Crosby
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Cassandra George
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Robert M. Kennedy
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Neil M. Schweitzer
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Jianguo Wen
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Richard P. Van Duyne
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Peter C. Stair
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Kenneth R. Poeppelmeier
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Laurence D. Marks
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Michael J. Bedzyk
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States
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25
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Li J, Fleurat-Lessard P, Zaera F, Delbecq F. Switch in Relative Stability between cis and trans 2-Butene on Pt(111) as a Function of Experimental Conditions: A Density Functional Theory Study. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00544] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jinyu Li
- College of Chemistry, Fuzhou University, 350002 Fuzhou, China
| | - Paul Fleurat-Lessard
- Université
de Lyon, Laboratoire de Chimie, École Normale Supérieure
de Lyon and CNRS, 15 parvis René Descartes, BP 7000, 69342 Lyon Cedex 07, France
- Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB, UMR-CNRS 6302), Université de Bourgogne Franche-Comté, 9 Avenue Alain Savary, 21000 Dijon, France
| | - Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, United States
| | - Françoise Delbecq
- Université
de Lyon, Laboratoire de Chimie, École Normale Supérieure
de Lyon and CNRS, 15 parvis René Descartes, BP 7000, 69342 Lyon Cedex 07, France
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26
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Zwaschka G, Rondelli M, Krause M, Rötzer MD, Hedhili MN, Heiz U, Basset JM, Schweinberger FF, D'Elia V. Supported sub-nanometer Ta oxide clusters as model catalysts for the selective epoxidation of cyclooctene. NEW J CHEM 2018. [DOI: 10.1039/c7nj04275b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The preparation of organic ligand-free, isolated and catalytically active tantalum oxide complexes (Ta1) and small clusters (Tan>1) on flat silicate support was accomplished by ultra-high vacuum (UHV) techniques followed by oxidation in air.
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Affiliation(s)
- G. Zwaschka
- Technical University of Munich
- Catalysis Research Center and Chemistry Department
- Chair of Physical Chemistry
- 85748 Garching
- Germany
| | - M. Rondelli
- Technical University of Munich
- Catalysis Research Center and Chemistry Department
- Chair of Physical Chemistry
- 85748 Garching
- Germany
| | - M. Krause
- Technical University of Munich
- Catalysis Research Center and Chemistry Department
- Chair of Physical Chemistry
- 85748 Garching
- Germany
| | - M. D. Rötzer
- Technical University of Munich
- Catalysis Research Center and Chemistry Department
- Chair of Physical Chemistry
- 85748 Garching
- Germany
| | - M. N. Hedhili
- King Abdullah University of Science and Technology (KAUST)
- Imaging and Characterization Core Lab
- Thuwal 23955-6900
- Kingdom of Saudi Arabia
| | - U. Heiz
- Technical University of Munich
- Catalysis Research Center and Chemistry Department
- Chair of Physical Chemistry
- 85748 Garching
- Germany
| | - J.-M. Basset
- King Abdullah University of Science and Technology (KAUST)
- Kaust Catalysis Center (KCC)
- Thuwal 23955-6900
- Kingdom of Saudi Arabia
| | - F. F. Schweinberger
- Technical University of Munich
- Catalysis Research Center and Chemistry Department
- Chair of Physical Chemistry
- 85748 Garching
- Germany
| | - V. D'Elia
- King Abdullah University of Science and Technology (KAUST)
- Kaust Catalysis Center (KCC)
- Thuwal 23955-6900
- Kingdom of Saudi Arabia
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
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27
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Song J, Wang Y, Walter ED, Washton NM, Mei D, Kovarik L, Engelhard MH, Prodinger S, Wang Y, Peden CHF, Gao F. Toward Rational Design of Cu/SSZ-13 Selective Catalytic Reduction Catalysts: Implications from Atomic-Level Understanding of Hydrothermal Stability. ACS Catal 2017. [DOI: 10.1021/acscatal.7b03020] [Citation(s) in RCA: 206] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James Song
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
- The Gene & Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, P.O. Box 646515, Pullman, Washington 99164, United States
| | - Yilin Wang
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Eric D. Walter
- Environmental
Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Nancy M. Washton
- Environmental
Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Donghai Mei
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Libor Kovarik
- Environmental
Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Mark H. Engelhard
- Environmental
Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Sebastian Prodinger
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Yong Wang
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
- The Gene & Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, P.O. Box 646515, Pullman, Washington 99164, United States
| | - Charles H. F. Peden
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
| | - Feng Gao
- Institute
for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99354, United States
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28
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Kim JG, Cha MC, Lee J, Choi T, Chang JY. Preparation of a Sulfur-Functionalized Microporous Polymer Sponge and In Situ Growth of Silver Nanoparticles: A Compressible Monolithic Catalyst. ACS APPLIED MATERIALS & INTERFACES 2017; 9:38081-38088. [PMID: 28994573 DOI: 10.1021/acsami.7b14807] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report a compressible monolithic catalyst based on a microporous organic polymer (MOP) sponge. The monolithic MOP sponge was synthesized via Sonogashira-Hagihara coupling reaction between 1,4-diiodotetrafluorobenzene and 1,3,5-triethynylbenzene in a cosolvent of toluene and TEA (2:1, v/v) without stirring. The MOP sponge had an intriguing microstructure, where tubular polymer fibers having a diameter of hundreds of nanometers were entangled. It showed hierarchical porosity with a Brunauer-Emmett-Teller (BET) surface area of 512 m2 g-1. The MOP sponge was functionalized with sulfur groups by the thiol-yne reaction. The functionalized MOP sponge exhibited a higher BET surface area than the MOP sponge by 13% due to the increase in the total pore and micropore volumes. A MOP sponge-Ag heterogeneous catalyst (S-MOPS-Ag) was prepared by in situ growth of silver nanoparticles inside the sulfur-functionalized MOP sponge by the reduction of Ag+ ions. The catalytic activity of S-MOPS-Ag was investigated for the reduction reaction of 4-nitrophenol in an aqueous condition. When S-MOPS-Ag was compressed and released during the reaction, the rate of the reaction was considerably increased. S-MOPS-Ag was easily removed from the reaction mixture owing to its monolithic character and was reused after washing and drying.
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Affiliation(s)
- Jong Gil Kim
- Department of Materials Science and Engineering, College of Engineering, Seoul National University , Seoul 08826, Korea
| | - Min Chul Cha
- Department of Materials Science and Engineering, College of Engineering, Seoul National University , Seoul 08826, Korea
| | - Jeongmin Lee
- Department of Materials Science and Engineering, College of Engineering, Seoul National University , Seoul 08826, Korea
| | - Taejin Choi
- Department of Materials Science and Engineering, College of Engineering, Seoul National University , Seoul 08826, Korea
| | - Ji Young Chang
- Department of Materials Science and Engineering, College of Engineering, Seoul National University , Seoul 08826, Korea
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29
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Karimaghaloo A, Andrade AM, Grewal S, Shim JH, Lee MH. Mechanism of Cathodic Performance Enhancement by a Few-Nanometer-Thick Oxide Overcoat on Porous Pt Cathodes of Solid Oxide Fuel Cells. ACS OMEGA 2017; 2:806-813. [PMID: 31457472 PMCID: PMC6641108 DOI: 10.1021/acsomega.6b00433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Accepted: 02/14/2017] [Indexed: 06/10/2023]
Abstract
In a recent report, we demonstrated that few-nanometer-thick yttria-stabilized zirconia (YSZ) coating on a porous Pt cathode of a solid oxide fuel cell is an excellent facilitator of oxygen reduction reaction (ORR) kinetics and an effective suppressor of Pt agglomeration. In this article, we reveal the actual role of the YSZ overcoat in the ORR process through a series of electrochemical analyses. Without the overcoat, the nanoporous Pt is significantly agglomerated during a high-temperature operation and the ORR becomes limited by the availability of triple phase boundaries (TPBs). An ultrathin YSZ overcoat prevents the ORR process from being limited by TPB area by preserving the morphology of its underlying Pt layer. More importantly, the overcoat acts as an excellent facilitator of the atomic-oxygen-species-mediated chemical process(es) that used to be rate-limiting in the ORR of a noncoated Pt/YSZ system.
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Affiliation(s)
- Alireza Karimaghaloo
- School
of Engineering, University of California
Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Angela Macedo Andrade
- School
of Engineering, University of California
Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Simranjit Grewal
- School
of Engineering, University of California
Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Joon Hyung Shim
- School
of Mechanical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea
| | - Min Hwan Lee
- School
of Engineering, University of California
Merced, 5200 North Lake Road, Merced, California 95343, United States
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30
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Ibrahim AA, Lin A, Zhang F, AbouZeid KM, El-Shall MS. Palladium Nanoparticles Supported on a Metal-Organic Framework-Partially Reduced Graphene Oxide Hybrid for the Catalytic Hydrodeoxygenation of Vanillin as a Model for Biofuel Upgrade Reactions. ChemCatChem 2017. [DOI: 10.1002/cctc.201600956] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Amr Awad Ibrahim
- Department of Chemistry; Virginia Commonwealth University; Richmond VA 23284-2006 USA
- Permanent address: Department of Chemistry; Faculty of Science; Mansoura University; Al-Mansoura Egypt
| | - Andrew Lin
- Department of Chemistry; Virginia Commonwealth University; Richmond VA 23284-2006 USA
| | - Fumin Zhang
- Department of Chemistry; Virginia Commonwealth University; Richmond VA 23284-2006 USA
- Permanent address: Key Laboratory of the Ministry of Education for Advanced, Catalysis Materials; Institute of Physical Chemistry; Zhejiang Normal University; 321004 Jinhua P.R. China
| | - Khaled M. AbouZeid
- Department of Chemistry; Virginia Commonwealth University; Richmond VA 23284-2006 USA
| | - M. Samy El-Shall
- Department of Chemistry; Virginia Commonwealth University; Richmond VA 23284-2006 USA
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31
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Dong Y, Zaera F. Kinetics of hydrogen adsorption during catalytic reactions on transition metal surfaces. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00216e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A study of the kinetics of the hydrogenation of ethylene promoted by hydrogen was performed by using a high-flux molecular beam in order to probe the intermediate pressure regime between the ultrahigh vacuum (UHV) used in surface-science experiments and the atmospheric conditions used in catalysis, the so-called “pressure gap”.
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Affiliation(s)
- Yujung Dong
- Department of Chemistry and UCR Center for Catalysis
- University of California
- Riverside
- USA
| | - Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis
- University of California
- Riverside
- USA
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32
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Kumar R, Yadav A, Mahiya K, Mathur P. Copper(II) complexes with box or flower type morphology: Sustainability versus perishability upon catalytic recycling. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.06.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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33
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Quast AD, Bornstein M, Greydanus BJ, Zharov I, Shumaker-Parry JS. Robust Polymer-Coated Diamond Supports for Noble-Metal Nanoparticle Catalysts. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01243] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Arthur D. Quast
- Department of Chemistry, University of Utah, 315 South 1400
East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Megan Bornstein
- Department of Chemistry, University of Utah, 315 South 1400
East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Benjamin J. Greydanus
- Department of Chemistry, University of Utah, 315 South 1400
East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Ilya Zharov
- Department of Chemistry, University of Utah, 315 South 1400
East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Jennifer S. Shumaker-Parry
- Department of Chemistry, University of Utah, 315 South 1400
East, Room 2020, Salt Lake
City, Utah 84112, United States
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34
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Dong Y, Ebrahimi M, Tillekaratne A, Simonovis JP, Zaera F. Hydrogenation vs. H–D isotope scrambling during the conversion of ethylene with hydrogen/deuterium catalyzed by platinum under single-collision conditions. Phys Chem Chem Phys 2016; 18:19248-58. [DOI: 10.1039/c6cp04157d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The catalytic hydrogenation of ethylene promoted by platinum was studied under a unique regime representing pressures in the mTorr range and single-collision conditions.
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Affiliation(s)
- Yujung Dong
- Department of Chemistry and UCR Center for Catalysis
- University of California
- Riverside
- USA
| | - Maryam Ebrahimi
- Department of Chemistry and UCR Center for Catalysis
- University of California
- Riverside
- USA
| | - Aashani Tillekaratne
- Department of Chemistry and UCR Center for Catalysis
- University of California
- Riverside
- USA
| | - Juan Pablo Simonovis
- Department of Chemistry and UCR Center for Catalysis
- University of California
- Riverside
- USA
| | - Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis
- University of California
- Riverside
- USA
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35
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Plessers E, Stassen I, Sree SP, Janssen KPF, Yuan H, Martens J, Hofkens J, De Vos D, Roeffaers MBJ. Resolving Interparticle Heterogeneities in Composition and Hydrogenation Performance between Individual Supported Silver on Silica Catalysts. ACS Catal 2015; 5:6690-6695. [PMID: 26618052 PMCID: PMC4640703 DOI: 10.1021/acscatal.5b02119] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Indexed: 11/28/2022]
Abstract
![]()
Supported metal nanoparticle catalysts
are commonly obtained through
deposition of metal precursors onto the support using incipient wetness
impregnation. Typically, empirical relations between metal nanoparticle
structure and catalytic performance are inferred from ensemble averaged
data in combination with high-resolution electron microscopy. This
approach clearly underestimates the importance of heterogeneities
present in a supported metal catalyst batch. Here we show for the
first time how incipient wetness impregnation leads to 10-fold variations
in silver loading between individual submillimeter-sized silica support
granules. This heterogeneity has a profound impact on the catalytic
performance, with 100-fold variations in hydrogenation performance
at the same level. In a straightforward fashion, optical microscopy
interlinks single support particle level catalytic measurements to
structural and compositional information. These detailed correlations
reveal the optimal silver loading. A thorough consideration of catalyst
heterogeneity and the impact thereof on the catalytic performance
is indispensable in the development of catalysts.
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Affiliation(s)
- Eva Plessers
- Centre for Surface Chemistry and Catalysis, KU Leuven, Kasteelpark Arenberg 23, 3001 Heverlee, Belgium
| | - Ivo Stassen
- Centre for Surface Chemistry and Catalysis, KU Leuven, Kasteelpark Arenberg 23, 3001 Heverlee, Belgium
| | | | - Kris P. F. Janssen
- Department of Chemistry, KU Leuven, Celestijnenlaan 200 F, 3001 Heverlee, Belgium
| | - Haifeng Yuan
- Department of Chemistry, KU Leuven, Celestijnenlaan 200 F, 3001 Heverlee, Belgium
| | - Johan Martens
- Centre for Surface Chemistry and Catalysis, KU Leuven, Kasteelpark Arenberg 23, 3001 Heverlee, Belgium
| | - Johan Hofkens
- Department of Chemistry, KU Leuven, Celestijnenlaan 200 F, 3001 Heverlee, Belgium
| | - Dirk De Vos
- Centre for Surface Chemistry and Catalysis, KU Leuven, Kasteelpark Arenberg 23, 3001 Heverlee, Belgium
| | - Maarten B. J. Roeffaers
- Centre for Surface Chemistry and Catalysis, KU Leuven, Kasteelpark Arenberg 23, 3001 Heverlee, Belgium
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36
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Li L, Abild-Pedersen F, Greeley J, Nørskov JK. Surface Tension Effects on the Reactivity of Metal Nanoparticles. J Phys Chem Lett 2015; 6:3797-3801. [PMID: 26722873 DOI: 10.1021/acs.jpclett.5b01746] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present calculated adsorption energies of oxygen on gold and platinum clusters with up to 923 atoms (3 nm diameter) using density functional theory. We find that surface tension of the clusters induces a compression, which weakens the bonding of adsorbates compared with the bonding on extended surfaces. The effect is largest for close-packed surfaces and almost nonexistent on the more reactive steps and edges. The effect is largest at low coverage and decreases, even changing sign, at higher coverages where the strain changes from compressive to tensile. Quantum size effects also influence adsorption energies but only below a critical size of 1.5 nm for platinum and 2.5 nm for gold. We develop a model to describe the strain-induced size effects on adsorption energies, which is able to describe the influence of surface structure, adsorbate, metal, and coverage.
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Affiliation(s)
- Lin Li
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University , 443 Via Ortega, Stanford, California 94305, United States
| | - Frank Abild-Pedersen
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Jeff Greeley
- School of Chemical Engineering, Purdue University , 480 Stadium Mall Drive, West Lafayette, Indianapolis 47907, United States
| | - Jens K Nørskov
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University , 443 Via Ortega, Stanford, California 94305, United States
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
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37
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Vanadium oxide nanostructures on another oxide: The viewpoint from model catalysts studies. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.12.015] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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38
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Stacchiola DJ. Tuning the properties of copper-based catalysts based on molecular in situ studies of model systems. Acc Chem Res 2015; 48:2151-8. [PMID: 26103058 DOI: 10.1021/acs.accounts.5b00200] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Studying catalytic processes at the molecular level is extremely challenging, due to the structural and chemical complexity of the materials used as catalysts and the presence of reactants and products in the reactor's environment. The most common materials used on catalysts are transition metals and their oxides. The importance of multifunctional active sites at metal/oxide interfaces has been long recognized, but a molecular picture of them based on experimental observations is only recently emerging. The initial approach to interrogate the surface chemistry of catalysts at the molecular level consisted of studying metal single crystals as models for reactive metal centers, moving later to single crystal or well-defined thin film oxides. The natural next iteration consisted in the deposition of metal nanoparticles on well-defined oxide substrates. Metal nanoparticles contain undercoordinated sites, which are more reactive. It is also possible to create architectures where oxide nanoparticles are deposited on top of metal single crystals, denominated inverse catalysts, leading in this case to a high concentration of reactive cationic sites in direct contact with the underlying fully coordinated metal atoms. Using a second oxide as a support (host), a multifunctional configuration can be built in which both metal and oxide nanoparticles are located in close proximity. Our recent studies on copper-based catalysts are presented here as an example of the application of these complementary model systems, starting from the creation of undercoordinated sites on Cu(111) and Cu2O(111) surfaces, continuing with the formation of mixed-metal copper oxides, the synthesis of ceria nanoparticles on Cu(111) and the codeposition of Cu and ceria nanoparticles on TiO2(110). Catalysts have traditionally been characterized before or after reactions and analyzed based on static representations of surface structures. It is shown here how dynamic changes on a catalyst's chemical state and morphology can be followed during a reaction by a combination of in situ microscopy and spectroscopy. In addition to determining the active phase of a catalyst by in situ methods, the presence of weakly adsorbed surface species or intermediates generated only in the presence of reactants can be detected, allowing in turn the comparison of experimental results with first principle modeling of specific reaction mechanisms. Three reactions are used to exemplify the approach: CO oxidation (CO + 1/2O2 → CO2), water gas shift reaction (WGSR) (CO + H2O → CO2 + H2), and methanol synthesis (CO2 + 3H2 → CH3OH + H2O). During CO oxidation, the full conversion of Cu(0) to Cu(2+) deactivates an initially outstanding catalyst. This can be remedied by the formation of a TiCuOx mixed-oxide that protects the presence of active partially oxidized Cu(+) cations. It is also shown that for the WGSR a switch occurs in the reaction mechanism, going from a redox process on Cu(111) to a more efficient associative pathway at the interface of ceria nanoparticles deposited on Cu(111). Similarly, the activation of CO2 at the ceria/Cu(111) interface allows its facile hydrogenation to methanol. Our combined studies emphasize the need of searching for optimal metal/oxide interfaces, where multifunctional sites can lead to new efficient catalytic reaction pathways.
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Affiliation(s)
- Darío J. Stacchiola
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, United States
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Zaera F. New advances in the use of infrared absorption spectroscopy for the characterization of heterogeneous catalytic reactions. Chem Soc Rev 2015; 43:7624-63. [PMID: 24424375 DOI: 10.1039/c3cs60374a] [Citation(s) in RCA: 143] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Infrared absorption spectroscopy has proven to be one of the most powerful spectroscopic techniques available for the characterization of catalytic systems. Although the history of IR absorption spectroscopy in catalysis is long, the technique continues to provide key fundamental information about a variety of catalysts and catalytic reactions, and to also offer novel options for the acquisition of new information on both reaction mechanisms and the nature of the solids used as catalysts. In this review, an overview is provided of the main contributions that have been derived from IR absorption spectroscopy studies of catalytic systems, and a discussion is included on new trends and new potential directions of research involving IR in catalysis. We start by briefly describing the power of Fourier-transform IR (FTIR) instruments and the main experimental IR setups available, namely, transmission (TIR), diffuse reflectance (DRIFTS), attenuated total reflection (ATR-IR), and reflection-absorption (RAIRS), for advancing research in catalysis. We then discuss the different environments under which IR characterization of catalysts is carried out, including in situ and operando studies of typical catalytic processes in gas-phase, research with model catalysts in ultrahigh vacuum (UHV) and so-called high-pressure cell instruments, and work involving liquid/solid interfaces. A presentation of the type of information extracted from IR data follows in terms of the identification of adsorbed intermediates, the characterization of the surfaces of the catalysts themselves, the quantitation of IR intensities to extract surface coverages, and the use of probe molecules to identify and titrate specific catalytic sites. Finally, the different options for carrying out kinetic studies with temporal resolution such as rapid-scan FTIR, step-scan FTIR, and the use of tunable lasers or synchrotron sources, and to obtain spatially resolved spectra, by sample rastering or by 2D imaging, are introduced.
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry, University of California, Riverside, CA 92521, USA.
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Yuk SF, Asthagiri A. A first-principles study of Pt thin films on SrTiO3(100): Support effects on CO adsorption. J Chem Phys 2015; 142:124704. [PMID: 25833600 DOI: 10.1063/1.4915521] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Density functional theory was used to study CO adsorption on thin Pt metal films supported on SrO- and TiO2-terminated SrTiO3(100) surfaces. Regardless of substrate-termination, significant enhancement in CO binding occurred on the Pt monolayer compared to the bulk Pt(100) surface. We also observed CO-coverage dependent shifting of Pt atoms, influenced by the nature of underlying oxide atoms. These oxide-induced effects become negligible after depositing more than 2 monolayers of Pt. Evaluating the electronic structures of oxide-supported Pt showed that the interaction of filled Pt dxz+yz and empty Pt dz(2) states with CO molecular orbitals can be directly related to CO adsorption on the Pt/SrTiO3(100) surface. A hybrid d-band model is able to capture the CO adsorption trends for systems that do not show large lateral distortion except for the case of Pt adsorbed above the Sr atom on the SrO-termination. For this case, charge transfer from adjacent Pt atoms leads to a large filled dz(2) peak below the Fermi level that weakens the Pt-CO σ bonding due to Pauli repulsion.
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Affiliation(s)
- Simuck F Yuk
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Aravind Asthagiri
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
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Liu L, Ge C, Zou W, Gu X, Gao F, Dong L. Crystal-plane-dependent metal–support interaction in Au/TiO2. Phys Chem Chem Phys 2015; 17:5133-40. [DOI: 10.1039/c4cp05449k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The metal–support interactions between Au and different TiO2 crystal planes are investigated to identify their crystal-plane-dependent properties.
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Affiliation(s)
- Lichen Liu
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Chengyan Ge
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Weixin Zou
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Xianrui Gu
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Fei Gao
- Jiangsu Key Laboratory of Vehicle Emissions Control
- Center of Modern Analysis
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Lin Dong
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- P. R. China
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Mao BH, Chang R, Shi L, Zhuo QQ, Rani S, Liu XS, Tyo EC, Vajda S, Wang SD, Liu Z. A near ambient pressure XPS study of subnanometer silver clusters on Al2O3and TiO2ultrathin film supports. Phys Chem Chem Phys 2014; 16:26645-52. [DOI: 10.1039/c4cp02325k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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43
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Progress towards five dimensional diffraction imaging of functional materials under process conditions. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.05.008] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Bonanni S, Aït-Mansour K, Harbich W, Brune H. Reaction-induced cluster ripening and initial size-dependent reaction rates for CO oxidation on Pt(n)/TiO2(110)-(1×1). J Am Chem Soc 2014; 136:8702-7. [PMID: 24870394 DOI: 10.1021/ja502867r] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We determined the CO oxidation rates for size-selected Ptn (n ∈ {3,7,10}) clusters deposited onto TiO2(110). In addition, we investigated the cluster morphologies and their mean sizes before and after the reaction. While the clusters are fairly stable upon annealing in ultrahigh vacuum up to 600 K, increasing the temperature while adsorbing either one of the two reactants leads to ripening already from 430 K on. This coarsening is even more pronounced when both reactants are dosed simultaneously, i.e., running the CO oxidation reaction. Since the ripening depends on the size initially deposited, there is nevertheless a size effect; the catalytic activity decreases monotonically with increasing initial cluster size.
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Affiliation(s)
- Simon Bonanni
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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Mayr L, Rameshan R, Klötzer B, Penner S, Rameshan C. Combined UHV/high-pressure catalysis setup for depth-resolved near-surface spectroscopic characterization and catalytic testing of model catalysts. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:055104. [PMID: 24880412 DOI: 10.1063/1.4874002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An ultra-high vacuum (UHV) setup for "real" and "inverse" model catalyst preparation, depth-resolved near-surface spectroscopic characterization, and quantification of catalytic activity and selectivity under technologically relevant conditions is described. Due to the all-quartz reactor attached directly to the UHV-chamber, transfer of the catalyst for in situ testing without intermediate contact to the ambient is possible. The design of the UHV-compatible re-circulating batch reactor setup allows the study of reaction kinetics under close to technically relevant catalytic conditions up to 1273 K without contact to metallic surfaces except those of the catalyst itself. With the attached differentially pumped exchangeable evaporators and the quartz-microbalance thickness monitoring equipment, a reproducible, versatile, and standardised sample preparation is possible. For three-dimensional near-surface sample characterization, the system is equipped with a hemispherical analyser for X-ray photoelectron spectroscopy (XPS), electron-beam or X-ray-excited Auger-electron spectroscopy, and low-energy ion scattering measurements. Due the dedicated geometry of the X-ray gun (54.7°, "magic angle") and the rotatable sample holder, depth analysis by angle-resolved XPS measurements can be performed. Thus, by the combination of characterisation methods with different information depths, a detailed three-dimensional picture of the electronic and geometric structure of the model catalyst can be obtained. To demonstrate the capability of the described system, comparative results for depth-resolved sample characterization and catalytic testing in methanol steam reforming on PdGa and PdZn near-surface intermetallic phases are shown.
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Affiliation(s)
- Lukas Mayr
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, 6020 Innsbruck, Austria
| | - Raffael Rameshan
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, 6020 Innsbruck, Austria
| | - Bernhard Klötzer
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, 6020 Innsbruck, Austria
| | - Simon Penner
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, 6020 Innsbruck, Austria
| | - Christoph Rameshan
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, 6020 Innsbruck, Austria
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Murugadoss A, Sorek E, Asscher M. Structure and Composition of Au–Cu and Pd–Cu Bimetallic Catalysts Affecting Acetylene Reactivity. Top Catal 2014. [DOI: 10.1007/s11244-014-0264-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hydrogen-atom-mediated electrochemistry. Nat Commun 2013; 4:2766. [DOI: 10.1038/ncomms3766] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Accepted: 10/14/2013] [Indexed: 11/08/2022] Open
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Takakusagi S, Chun WJ, Uehara H, Asakura K, Iwasawa Y. Polarization-Dependent Total-Reflection Fluorescence X-ray Absorption Fine Structure for 3D Structural Determination and Surface Fine Tuning. Top Catal 2013. [DOI: 10.1007/s11244-013-0134-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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