1
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Tang M, Li S, Zhu B, You R, Yu L, Ou Y, Yuan W, Xu Q, Yang H, Wales DJ, Zhang Z, Gao Y, Wang Y. Oscillatory Active State of a Pd Nanocatalyst Identified by In Situ Capture of the Instantaneous Structure-Activity Change at the Atomic Scale. J Am Chem Soc 2024; 146:18341-18349. [PMID: 38942067 DOI: 10.1021/jacs.4c02830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/30/2024]
Abstract
Identifying the active phase with the highest activity, which is long-believed to be a steady state of the catalyst, is the basis of rational design of heterogeneous catalysis. In this work, we performed detailed in situ investigations, successfully capturing the instantaneous structure-activity change in oscillating Pd nanocatalysts during methane oxidation, which reveals an unprecedented oscillatory active state. Combining in situ quantitative environmental transmission electron microscopy and highly sensitive online mass spectrometry, we identified two distinct phases for the reaction: one where the Pd nanoparticles refill with oxygen, and the other, a period of abrupt pumping of oxygen and boosted methane oxidation within about 1 s. It is the rapid reduction process that shows the highest activity for total oxidation of methane, not a PdO or Pd steady state under the conditions applied here (methane:oxygen = 5:1). This observation challenges the traditional understanding of the active phase and requires a completely different strategy for catalyst optimization.
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Affiliation(s)
- Min Tang
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Songda Li
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Beien Zhu
- Phonon Science Research Center for Carbon Dioxide, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Ruiyang You
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Linjiang Yu
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yang Ou
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Wentao Yuan
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qiang Xu
- DENSsolutions, Delft 2628 ZD, Netherlands
- Guangzhou Laboratory, Guangzhou 510220, China
| | - Hangsheng Yang
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan 030032, China
| | - David J Wales
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Ze Zhang
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yi Gao
- Phonon Science Research Center for Carbon Dioxide, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Yong Wang
- State Key Laboratory of Silicon and Advanced Semiconductor Materials and Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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2
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Lifar MS, Tereshchenko AA, Bulgakov AN, Guda SA, Guda AA, Soldatov AV. Optimal Dynamic Regimes for CO Oxidation Discovered by Reinforcement Learning. ACS OMEGA 2024; 9:27987-27997. [PMID: 38973853 PMCID: PMC11223201 DOI: 10.1021/acsomega.3c10422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 05/30/2024] [Accepted: 06/03/2024] [Indexed: 07/09/2024]
Abstract
Metal nanoparticles are widely used as heterogeneous catalysts to activate adsorbed molecules and reduce the energy barrier of the reaction. Reaction product yield depends on the interplay between elementary processes: adsorption, activation, desorption, and reaction. These processes, in turn, depend on the inlet gas composition, temperature, and pressure. At a steady state, the active surface sites may be inaccessible due to adsorbed reagents. Periodic regime may thus improve the yield, but the appropriate period and waveform are not known in advance. Dynamic control should account for surface and atmospheric modifications and adjust reaction parameters according to the current state of the system and its history. In this work, we applied a reinforcement learning algorithm to control CO oxidation on a palladium catalyst. The policy gradient algorithm was trained in the theoretical environment, parametrized from experimental data. The algorithm learned to maximize the CO2 formation rate based on CO and O2 partial pressures for several successive time steps. Within a unified approach, we found optimal stationary, periodic, and nonperiodic regimes for different problem formulations and gained insight into why the dynamic regime can be preferential. In general, this work contributes to the task of popularizing the reinforcement learning approach in the field of catalytic science.
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Affiliation(s)
- Mikhail S. Lifar
- The
Smart Materials Research Institute, Southern
Federal University, 344090 Rostov-on-Don, Russia
| | - Andrei A. Tereshchenko
- The
Smart Materials Research Institute, Southern
Federal University, 344090 Rostov-on-Don, Russia
| | - Aleksei N. Bulgakov
- The
Smart Materials Research Institute, Southern
Federal University, 344090 Rostov-on-Don, Russia
| | - Sergey A. Guda
- The
Smart Materials Research Institute, Southern
Federal University, 344090 Rostov-on-Don, Russia
- Institute
for Mathematics, Mechanics and Computer Science in the name of I.I.
Vorovich, Southern Federal University, 344090 Rostov-on-Don, Russia
| | - Alexander A. Guda
- The
Smart Materials Research Institute, Southern
Federal University, 344090 Rostov-on-Don, Russia
| | - Alexander V. Soldatov
- The
Smart Materials Research Institute, Southern
Federal University, 344090 Rostov-on-Don, Russia
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3
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Pineda M, Stamatakis M. Kinetic Monte Carlo simulations for heterogeneous catalysis: Fundamentals, current status, and challenges. J Chem Phys 2022; 156:120902. [DOI: 10.1063/5.0083251] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Kinetic Monte Carlo (KMC) simulations in combination with first-principles (1p)-based calculations are rapidly becoming the gold-standard computational framework for bridging the gap between the wide range of length scales and time scales over which heterogeneous catalysis unfolds. 1p-KMC simulations provide accurate insights into reactions over surfaces, a vital step toward the rational design of novel catalysts. In this Perspective, we briefly outline basic principles, computational challenges, successful applications, as well as future directions and opportunities of this promising and ever more popular kinetic modeling approach.
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Affiliation(s)
- M. Pineda
- Thomas Young Centre and Department of Chemical Engineering, University College London, Roberts Building, Torrington Place, London WC1E 7JE, United Kingdom
| | - M. Stamatakis
- Thomas Young Centre and Department of Chemical Engineering, University College London, Roberts Building, Torrington Place, London WC1E 7JE, United Kingdom
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4
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Huang X, Jones T, Fedorov A, Farra R, Copéret C, Schlögl R, Willinger MG. Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2101772. [PMID: 34117665 DOI: 10.1002/adma.202101772] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/10/2021] [Indexed: 05/12/2023]
Abstract
Metal catalysts play an important role in industrial redox reactions. Although extensively studied, the state of these catalysts under operating conditions is largely unknown, and assignments of active sites remain speculative. Herein, an operando transmission electron microscopy study is presented, which interrelates the structural dynamics of redox metal catalysts to their activity. Using hydrogen oxidation on copper as an elementary redox reaction, it is revealed how the interaction between metal and the surrounding gas phase induces complex structural transformations and drives the system from a thermodynamic equilibrium toward a state controlled by the chemical dynamics. Direct imaging combined with the simultaneous detection of catalytic activity provides unparalleled structure-activity insights that identify distinct mechanisms for water formation and reveal the means by which the system self-adjusts to changes of the gas-phase chemical potential. Density functional theory calculations show that surface phase transitions are driven by chemical dynamics even when the system is far from a thermodynamic phase boundary. In a bottom-up approach, the dynamic behavior observed here for an elementary reaction is finally extended to more relevant redox reactions and other metal catalysts, which underlines the importance of chemical dynamics for the formation and constant re-generation of transient active sites during catalysis.
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Affiliation(s)
- Xing Huang
- Scientific Center for Optical and Electron Microscopy, ETH Zurich, Otto-Stern-Weg 3, Zurich, 8093, Switzerland
- College of Chemistry, Fuzhou University, Fuzhou, 350116, P. R. China
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1-5, Zurich, 8093, Switzerland
- Fritz-Haber Institute of Max-Planck Society, Faradayweg 4-6, 14195, Berlin, Germany
| | - Travis Jones
- Fritz-Haber Institute of Max-Planck Society, Faradayweg 4-6, 14195, Berlin, Germany
| | - Alexey Fedorov
- Department of Mechanical and Process Engineering, ETH Zurich, Leonhardstrasse 21, 8092, Zurich, Switzerland
| | - Ramzi Farra
- Fritz-Haber Institute of Max-Planck Society, Faradayweg 4-6, 14195, Berlin, Germany
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1-5, Zurich, 8093, Switzerland
| | - Robert Schlögl
- Fritz-Haber Institute of Max-Planck Society, Faradayweg 4-6, 14195, Berlin, Germany
- Department Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, 45470, Mülheim an der Ruhr, Germany
| | - Marc-Georg Willinger
- Scientific Center for Optical and Electron Microscopy, ETH Zurich, Otto-Stern-Weg 3, Zurich, 8093, Switzerland
- Fritz-Haber Institute of Max-Planck Society, Faradayweg 4-6, 14195, Berlin, Germany
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5
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Shetty M, Walton A, Gathmann SR, Ardagh MA, Gopeesingh J, Resasco J, Birol T, Zhang Q, Tsapatsis M, Vlachos DG, Christopher P, Frisbie CD, Abdelrahman OA, Dauenhauer PJ. The Catalytic Mechanics of Dynamic Surfaces: Stimulating Methods for Promoting Catalytic Resonance. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03336] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Manish Shetty
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Catalysis Center for Energy Innovation, 150 Academy Street, Newark, Delaware 19716, United States
| | - Amber Walton
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Sallye R. Gathmann
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - M. Alexander Ardagh
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Catalysis Center for Energy Innovation, 150 Academy Street, Newark, Delaware 19716, United States
| | - Joshua Gopeesingh
- University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Joaquin Resasco
- University of California Santa Barbara, Engineering II Building, Santa Barbara, California 93106, United States
| | - Turan Birol
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Qi Zhang
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Michael Tsapatsis
- Catalysis Center for Energy Innovation, 150 Academy Street, Newark, Delaware 19716, United States
- Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland 20723, United States
- Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Dionisios G. Vlachos
- Catalysis Center for Energy Innovation, 150 Academy Street, Newark, Delaware 19716, United States
- Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United States
| | - Phillip Christopher
- Catalysis Center for Energy Innovation, 150 Academy Street, Newark, Delaware 19716, United States
- University of California Santa Barbara, Engineering II Building, Santa Barbara, California 93106, United States
| | - C. Daniel Frisbie
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Omar A. Abdelrahman
- Catalysis Center for Energy Innovation, 150 Academy Street, Newark, Delaware 19716, United States
- University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Paul J. Dauenhauer
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Catalysis Center for Energy Innovation, 150 Academy Street, Newark, Delaware 19716, United States
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6
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Thattarathody R, Katheria S, Sheintuch M. Methylal Steam Reforming with Pt/Al 2O 3, Ni/Al 2O 3, and Mixed Cu/ZnO/Al 2O 3 Catalysts. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04483] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Sanjay Katheria
- Department of Chemical Engineering, Technion, Haifa 3200003, Israel
| | - Moshe Sheintuch
- Department of Chemical Engineering, Technion, Haifa 3200003, Israel
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7
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Narendiran K, Viswanathan GA. Wall Temperature Modulates Transversal Spatiotemporal Pattern Selection in Shallow, Nonadiabatic Packed-Bed Reactors. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Narendiran
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Ganesh A. Viswanathan
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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8
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Lashina EA, Kaichev VV, Saraev AA, Vinokurov ZS, Chumakova NA, Chumakov GA, Bukhtiyarov VI. Experimental Study and Mathematical Modeling of Self-Sustained Kinetic Oscillations in Catalytic Oxidation of Methane over Nickel. J Phys Chem A 2017; 121:6874-6886. [PMID: 28813604 DOI: 10.1021/acs.jpca.7b04525] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elena A. Lashina
- Boreskov Institute of Catalysis, Akademika Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
| | - Vasily V. Kaichev
- Boreskov Institute of Catalysis, Akademika Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
| | - Andrey A. Saraev
- Boreskov Institute of Catalysis, Akademika Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
| | - Zakhar S. Vinokurov
- Boreskov Institute of Catalysis, Akademika Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
| | - Nataliya A. Chumakova
- Boreskov Institute of Catalysis, Akademika Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
| | - Gennadii A. Chumakov
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
- Sobolev Institute of Mathematics, Akademika Koptyuga Ave. 4, 630090 Novosibirsk, Russia
| | - Valerii I. Bukhtiyarov
- Boreskov Institute of Catalysis, Akademika Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
- Novosibirsk State University, Pirogova
Str. 2, 630090 Novosibirsk, Russia
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9
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Blomberg S, Zhou J, Gustafson J, Zetterberg J, Lundgren E. 2D and 3D imaging of the gas phase close to an operating model catalyst by planar laser induced fluorescence. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:453002. [PMID: 27619414 DOI: 10.1088/0953-8984/28/45/453002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In recent years, efforts have been made in catalysis related surface science studies to explore the possibilities to perform experiments at conditions closer to those of a technical catalyst, in particular at increased pressures. Techniques such as high pressure scanning tunneling/atomic force microscopy (HPSTM/AFM), near ambient pressure x-ray photoemission spectroscopy (NAPXPS), surface x-ray diffraction (SXRD) and polarization-modulation infrared reflection absorption spectroscopy (PM-IRAS) at semi-realistic conditions have been used to study the surface structure of model catalysts under reaction conditions, combined with simultaneous mass spectrometry (MS). These studies have provided an increased understanding of the surface dynamics and the structure of the active phase of surfaces and nano particles as a reaction occurs, providing novel information on the structure/activity relationship. However, the surface structure detected during the reaction is sensitive to the composition of the gas phase close to the catalyst surface. Therefore, the catalytic activity of the sample itself will act as a gas-source or gas-sink, and will affect the surface structure, which in turn may complicate the assignment of the active phase. For this reason, we have applied planar laser induced fluorescence (PLIF) to the gas phase in the vicinity of an active model catalysts. Our measurements demonstrate that the gas composition differs significantly close to the catalyst and at the position of the MS, which indeed should have a profound effect on the surface structure. However, PLIF applied to catalytic reactions presents several beneficial properties in addition to investigate the effect of the catalyst on the effective gas composition close to the model catalyst. The high spatial and temporal resolution of PLIF provides a unique tool to visualize the on-set of catalytic reactions and to compare different model catalysts in the same reactive environment. The technique can be applied to a large number of molecules thanks to the technical development of lasers and detectors over the last decades, and is a complementary and visual alternative to traditional MS to be used in environments difficult to asses with MS. In this article we will review general considerations when performing PLIF experiments, our experimental set-up for PLIF and discuss relevant examples of PLIF applied to catalysis.
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Affiliation(s)
- Sara Blomberg
- Division of Synchrotron Radiation Research, Lund University, Box 118, S-221 00, Sweden
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10
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Gänzler AM, Casapu M, Boubnov A, Müller O, Conrad S, Lichtenberg H, Frahm R, Grunwaldt JD. Operando spatially and time-resolved X-ray absorption spectroscopy and infrared thermography during oscillatory CO oxidation. J Catal 2015. [DOI: 10.1016/j.jcat.2015.01.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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Lashina EA, Kaichev VV, Chumakova NA, Ustyugov VV, Chumakov GA, Bukhtiyarov VI. Mathematical simulation of self-oscillations in methane oxidation on nickel: An isothermal model. KINETICS AND CATALYSIS 2012. [DOI: 10.1134/s0023158412030081] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Rao T, Zhang Z, Hou ZH, Xin HW. Coarse-grained Simulations of Chemical Oscillation in Lattice Brusselator System. CHINESE J CHEM PHYS 2011. [DOI: 10.1088/1674-0068/24/04/425-433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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13
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Alas SJ, Vicente L. Kinetic study of the “surface explosion” phenomenon in the NO+CO reaction on Pt(100) through dynamic Monte Carlo simulation. J Chem Phys 2008; 128:134705. [DOI: 10.1063/1.2885048] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Chapter 9 Non-linear Dynamics in Catalytic Reactions. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1573-4331(08)00009-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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15
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Zhdanov VP. Simulation of the effect of surface-oxide formation on bistability in CO oxidation on Pt-group metals. J Chem Phys 2007; 126:074706. [PMID: 17328626 DOI: 10.1063/1.2483966] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The kinetics of CO oxidation on Pt-group metals are known to often exhibit bistability. During the low-reactive regime observed at relatively high CO pressure, the surface is primarily covered by CO and the reaction rate is controlled by O2 dissociation. During the high-reactive regime at relatively low CO pressure, in contrast, the surface is mainly covered by oxygen and the reaction rate is proportional to CO pressure. In the latter case, the adsorbed oxygen may be in the chemisorbed state and/or may form surface oxide. The experiments indicate that the formation of surface oxide often occurs via the island growth and accordingly should be described in terms of the theory of first-order phase transitions. Here, the author proposes a generic lattice-gas model satisfying this requirement and allowing one to execute the corresponding Monte Carlo simulations. Systematically varying the model parameters determining the oxide stability, he classifies the likely scenarios of the bistable reaction kinetics complicated by oxide formation.
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16
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Nekhamkina O, Digilov R, Sheintuch M. Modeling of temporally complex breathing patterns during Pd-catalyzed CO oxidation. J Chem Phys 2003. [DOI: 10.1063/1.1584651] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Chaos and synchronisation in heterogeneous catalytic systems: CO oxidation over Pd zeolite catalysts. Catal Today 2001. [DOI: 10.1016/s0920-5861(01)00342-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Centi G. Supported palladium catalysts in environmental catalytic technologies for gaseous emissions. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1381-1169(01)00155-8] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Zhdanov VP, Kasemo B. Coupled catalytic oscillators: Beyond the mass-action law. CHAOS (WOODBURY, N.Y.) 2001; 11:335-343. [PMID: 12779467 DOI: 10.1063/1.1368129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We present Monte Carlo simulations of the reaction kinetics corresponding to two coupled catalytic oscillators in the case when oscillations result from the interplay between the reaction steps and adsorbate-induced surface restructuring. The model used is aimed to mimic oscillations on a single nm catalyst particle with two kinds of facets or on two catalyst particles on a support. Specifically, we treat the NO reduction by H(2) on a composite catalyst containing two catalytically active Pt(100) parts connected by an inactive link. The catalyst is represented by a rectangular fragment of a square lattice. The left- and right-hand parts of the lattice mimic Pt(100). With an appropriate choice of the model parameters, these sublattices play a role of catalytic oscillators. The central catalytically inactive sublattice is considered to be able only to adsorb NO reversibly and can be viewed as a Pt(111) facet or a support. The interplay of the reactions running on the catalytically active areas occurs via NO diffusion over the boundaries between the sublattices. Using this model, we show that the coupling of the catalytically active sublattices may synchronize nearly harmonic oscillations observed on these sublattices and also may result in the appearance of aperiodic partly synchronized oscillations. The spatio-temporal patterns corresponding to these regimes are nontrivial. In particular, the model predicts that, due to phase separation, the reaction may be accompanied by the formation of narrow NO-covered zones on the left and right sublattices near the boundaries between these sublattices and the central sublattice. Such patterns cannot be obtained by using the conventional mean-field reaction-diffusion equations based on the mass-action law. The experimental opportunities to observe the predicted phenomena are briefly discussed. (c) 2001 American Institute of Physics.
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Affiliation(s)
- V. P. Zhdanov
- Department of Applied Physics, Chalmers University of Technology, S-412 96 Goteborg, SwedenBoreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia
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20
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Centi G, Cavani F, Trifirò F. New Aspects of the Mechanisms of Selective Oxidation and Structure/Activity Relationships. SELECTIVE OXIDATION BY HETEROGENEOUS CATALYSIS 2001. [DOI: 10.1007/978-1-4615-4175-2_8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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21
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Latkin E, Elokhin V, Gorodetskii V. Monte Carlo model of oscillatory CO oxidation having regard to the change of catalytic properties due to the adsorbate-induced Pt(1 0 0) structural transformation. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1381-1169(00)00468-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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22
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Transient response of catalyst bed temperature in the pulsed reaction of partial oxidation of methane to synthesis gas over supported group VIII metal catalysts. Catal Today 2001. [DOI: 10.1016/s0920-5861(00)00506-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Li J, Liu C, Zhu Q. Self-Sustained Fluctuation in the Oxidation of Methanol over an Fe–Mo Oxide Catalyst. J Catal 2000. [DOI: 10.1006/jcat.2000.3053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Cobden P, de Wolf C, Smirnov M, Makeev A, Nieuwenhuys B. Non-linear processes on Pt, Rh, Pd, Ir and Ru surfaces during the NOhydrogen reactions. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(00)00050-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Latkin E, Elokhin V, Matveev A, Gorodetskii V. The role of subsurface oxygen in oscillatory behaviour of CO+O2 reaction over Pd metal catalysts: Monte Carlo model. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(00)00061-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Belessi V, Costa C, Bakas T, Anastasiadou T, Pomonis P, Efstathiou A. Catalytic behavior of La–Sr–Ce–Fe–O mixed oxidic/perovskitic systems for the NO+CO and NO+CH4+O2 (lean-NOx) reactions. Catal Today 2000. [DOI: 10.1016/s0920-5861(00)00300-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Oscillating Behavior in N2O Decomposition over Rh Supported on Zirconia-Based Catalysts: The Role of the Reaction Conditions. J Catal 2000. [DOI: 10.1006/jcat.2000.2847] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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López AC, Albano EV. Dynamic response of an irreversible catalytic reaction to periodic variation of the reactant’s pressure. J Chem Phys 2000. [DOI: 10.1063/1.480931] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Slinko MM, Kurkina ES, Liauw MA, Jaeger NI. Mathematical modeling of complex oscillatory phenomena during CO oxidation over Pd zeolite catalysts. J Chem Phys 1999. [DOI: 10.1063/1.480144] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Berdau M, Yelenin GG, Karpowicz A, Ehsasi M, Christmann K, Block JH. Macroscopic and mesoscopic characterization of a bistable reaction system: CO oxidation on Pt(111) surface. J Chem Phys 1999. [DOI: 10.1063/1.479097] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zhdanov VP. Simulation of surface restructuring and oscillations in CO–NO reaction on Pt(100). J Chem Phys 1999. [DOI: 10.1063/1.478782] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Oscillations of methane combustion over alumina-supported palladium catalysts under oxygen-deficient conditions. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s1381-1169(98)00286-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Experimental study of reaction instability and oscillatory behavior during CO oxidation over Pd supported on glass fiber catalysts. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0167-2991(99)80148-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Bennett CO. Experiments and Processes in the Transient Regime for Heterogeneous Catalysis. ADVANCES IN CATALYSIS 1999. [DOI: 10.1016/s0360-0564(08)60515-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Non-steady activity during methane combustion over Pd/Al2O3 and the influences of Pt and CeO2 additives. Catal Today 1999. [DOI: 10.1016/s0920-5861(98)00308-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Berdau M, Karpowicz A, Yelenin GG, Christmann K, Block JH. Kinetic phase diagram for CO oxidation on Pt(210): Pattern formation in the hysteresis and oscillation regions. J Chem Phys 1997. [DOI: 10.1063/1.473131] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kulginov D, Zhdanov VP, Kasemo B. Oscillatory surface reaction kinetics due to coupling of bistability and diffusion limitations. J Chem Phys 1997. [DOI: 10.1063/1.473054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sheintuch M. Spatiotemporal patterns in a heterogeneous model of a catalyst particle. J Chem Phys 1996. [DOI: 10.1063/1.471874] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Jelemensky L, Kuster B, Marin G. Kinetic modelling of multiple steady-states for the oxidation of aqueous ethanol with oxygen on a carbon supported platinum catalyst. Chem Eng Sci 1996. [DOI: 10.1016/0009-2509(96)00035-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Liauw MA, Plath PJ, Jaeger NI. Complex oscillations and global coupling during the catalytic oxidation of CO. J Chem Phys 1996. [DOI: 10.1063/1.471299] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yamamoto SY, Surko CM, Maple MB, Pina RK. Spatio‐temporal dynamics of oscillatory heterogeneous catalysis: CO oxidation on platinum. J Chem Phys 1995. [DOI: 10.1063/1.468963] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Abstract
The physical concepts underlying the lateral distribution of the components forming a lamellar assembly of amphiphiles are discussed in this review. The role of amphiphiles' molecular structure and/or aqueous environment (ionic strength, water soluble substances) on formation and stability of lateral patterns is investigated. A considerable effort is devoted to the analysis of the properties of patterned structure which can be different from those of randomly mixed multi-component lamellae. Examples include adhesion and fusion among laterally inhomogeneous bilayers, enhanced interfacial adsorption of ions and polymers, enhanced transport across the bilayer, modified mechanical properties, local stabilization of non-planar geometries (pores, edges) and related phenomena (electroporation, budding transition and so on). Furthermore, an analysis of chemical reactivity within or at the water interface of a laterally inhomogeneous bilayer is briefly discussed. A link between these concepts and experimental findings taken from the biological literature is attempted throughout the review.
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Affiliation(s)
- A Raudino
- Dipartimento di Scienze Chimiche, Università di Catania, Italy
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Mertens F, Imbihl R, Mikhailov A. Turbulence and standing waves in oscillatory chemical reactions with global coupling. J Chem Phys 1994. [DOI: 10.1063/1.468482] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Shvartsman S, Sheintuch M. Spatiotemporal patterns in an isothermal heterogeneous model of a fixed‐bed reactor. J Chem Phys 1994. [DOI: 10.1063/1.467988] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Hartmann N, Krischer K, Imbihl R. The role of adsorbate–adsorbate interactions in the rate oscillations in catalytic CO oxidation on Pd (110). J Chem Phys 1994. [DOI: 10.1063/1.468420] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mertens F, Imbihl R, Mikhailov A. Breakdown of global coupling in oscillatory chemical reactions. J Chem Phys 1993. [DOI: 10.1063/1.465590] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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