1
|
He B, Zhang Y, Liu X, Chen L. In‐situ Transmission Electron Microscope Techniques for Heterogeneous Catalysis. ChemCatChem 2020. [DOI: 10.1002/cctc.201902285] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bowen He
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
| | - Yixiao Zhang
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
| | - Xi Liu
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
- SynCat@BeijingSynfuels China Technology Co.Ltd Beijing 101407 P.R. China
- State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of Sciences Taiyuan 030001 P.R. China
| | - Liwei Chen
- In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P.R. China
- i-Lab, CAS Center for Excellence in Nanoscience Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO)Chinese Academy of Sciences Suzhou 215123 P.R. China
| |
Collapse
|
2
|
Leiser RJ, Rotstein HG. Emergence of localized patterns in globally coupled networks of relaxation oscillators with heterogeneous connectivity. Phys Rev E 2017; 96:022303. [PMID: 28950537 DOI: 10.1103/physreve.96.022303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Indexed: 11/07/2022]
Abstract
Oscillations in far-from-equilibrium systems (e.g., chemical, biochemical, biological) are generated by the nonlinear interplay of positive and negative feedback effects operating at different time scales. Relaxation oscillations emerge when the time scales between the activators and the inhibitors are well separated. In addition to the large-amplitude oscillations (LAOs) or relaxation type, these systems exhibit small-amplitude oscillations (SAOs) as well as abrupt transitions between them (canard phenomenon). Localized cluster patterns in networks of relaxation oscillators consist of one cluster oscillating in the LAO regime or exhibiting mixed-mode oscillations (LAOs interspersed with SAOs), while the other oscillates in the SAO regime. Because the individual oscillators are monostable, localized patterns are a network phenomenon that involves the interplay of the connectivity and the intrinsic dynamic properties of the individual nodes. Motivated by experimental and theoretical results on the Belousov-Zhabotinsky reaction, we investigate the mechanisms underlying the generation of localized patterns in globally coupled networks of piecewise-linear relaxation oscillators where the global feedback term affects the rate of change of the activator (fast variable) and depends on the weighted sum of the inhibitor (slow variable) at any given time. We also investigate whether these patterns are affected by the presence of a diffusive type of coupling whose synchronizing effects compete with the symmetry-breaking global feedback effects.
Collapse
Affiliation(s)
- Randolph J Leiser
- Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
| | - Horacio G Rotstein
- Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102, USA.,Institute for Brain and Neuroscience Research, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
| |
Collapse
|
3
|
|
4
|
Vendelbo SB, Elkjær CF, Falsig H, Puspitasari I, Dona P, Mele L, Morana B, Nelissen BJ, van Rijn R, Creemer JF, Kooyman PJ, Helveg S. Visualization of oscillatory behaviour of Pt nanoparticles catalysing CO oxidation. NATURE MATERIALS 2014; 13:884-90. [PMID: 25038730 DOI: 10.1038/nmat4033] [Citation(s) in RCA: 221] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 05/15/2014] [Indexed: 05/22/2023]
Abstract
Many catalytic reactions under fixed conditions exhibit oscillatory behaviour. The oscillations are often attributed to dynamic changes in the catalyst surface. So far, however, such relationships were difficult to determine for catalysts consisting of supported nanoparticles. Here, we employ a nanoreactor to study the oscillatory CO oxidation catalysed by Pt nanoparticles using time-resolved high-resolution transmission electron microscopy, mass spectrometry and calorimetry. The observations reveal that periodic changes in the CO oxidation are synchronous with a periodic refacetting of the Pt nanoparticles. The oscillatory reaction is modelled using density functional theory and mass transport calculations, considering the CO adsorption energy and the oxidation rate as site-dependent. We find that to successfully explain the oscillations, the model must contain the phenomenon of refacetting. The nanoreactor approach can thus provide atomic-scale information that is specific to surface sites. This will improve the understanding of dynamic properties in catalysis and related fields.
Collapse
Affiliation(s)
- S B Vendelbo
- ChemE, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - C F Elkjær
- Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Kgs. Lyngby, Denmark
| | - H Falsig
- Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Kgs. Lyngby, Denmark
| | - I Puspitasari
- ChemE, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - P Dona
- FEI Company, Achtseweg Noord 5, 5651 GG Eindhoven, The Netherlands
| | - L Mele
- FEI Company, Achtseweg Noord 5, 5651 GG Eindhoven, The Netherlands
| | - B Morana
- DIMES-ECTM, Delft University of Technology, PO Box 5053, 2600 GB Delft, The Netherlands
| | - B J Nelissen
- Albemarle Catalyst Company BV, PO Box 37650, 1030 BE Amsterdam, The Netherlands
| | - R van Rijn
- Leiden Probe Microscopy BV, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
| | - J F Creemer
- DIMES-ECTM, Delft University of Technology, PO Box 5053, 2600 GB Delft, The Netherlands
| | - P J Kooyman
- ChemE, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - S Helveg
- Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Kgs. Lyngby, Denmark
| |
Collapse
|
5
|
Jensen R, Andersen T, Nierhoff A, Pedersen T, Hansen O, Dahl S, Chorkendorff I. Self-sustained carbon monoxide oxidation oscillations on size-selected platinum nanoparticles at atmospheric pressure. Phys Chem Chem Phys 2013; 15:2698-702. [PMID: 23340809 DOI: 10.1039/c2cp43684a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-quality mass spectrometry data of the oscillatory behavior of CO oxidation on SiO(2) supported Pt-nanoparticles at atmospheric pressure have been acquired as a function of pressure, coverage, gas composition and nanoparticle size. The oscillations are self-sustained for several days at constant temperature, pressure and CO/O(2) ratio. The frequency of the oscillations is very well defined and increases over time. The oscillation frequency is furthermore strongly temperature dependent with increasing temperature resulting in increasing frequency. A plausible mechanism for the oscillations is proposed based on an oxidation-reduction cycle of the nanoparticles which change the rate of CO oxidation on the particles.
Collapse
Affiliation(s)
- Robert Jensen
- CINF, Department of Physics, Technical University of Denmark, Fysikvej 312, 2800 Lyngby, Denmark
| | | | | | | | | | | | | |
Collapse
|
6
|
Rotstein HG, Wu H. Swing, release, and escape mechanisms contribute to the generation of phase-locked cluster patterns in a globally coupled FitzHugh-Nagumo model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 86:066207. [PMID: 23368024 DOI: 10.1103/physreve.86.066207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Revised: 08/31/2012] [Indexed: 06/01/2023]
Abstract
We investigate the mechanism of generation of phase-locked cluster patterns in a globally coupled FitzhHugh-Nagumo model where the fast variable (activator) receives global feedback from the slow variable (inhibitor). We identify three qualitatively different mechanisms (swing-and-release, hold-and-release, and escape-and-release) that contribute to the generation of these patterns. We describe these mechanisms and use this framework to explain under what circumstances two initially out-of-phase oscillatory clusters reach steady phase-locked and in-phase synchronized solutions, and how the phase difference between these steady state cluster patterns depends on the clusters relative size, the global coupling intensity, and other model parameters.
Collapse
Affiliation(s)
- Horacio G Rotstein
- Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102, USA.
| | | |
Collapse
|
7
|
Rotstein HG, Wu H. Dynamic mechanisms of generation of oscillatory cluster patterns in a globally coupled chemical system. J Chem Phys 2012; 137:104908. [PMID: 22979891 DOI: 10.1063/1.4749792] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We use simulations and dynamical systems tools to investigate the mechanisms of generation of phase-locked and localized oscillatory cluster patterns in a globally coupled Oregonator model where the activator receives global feedback from the inhibitor, mimicking experimental results observed in the photosensitive Belousov-Zhabotinsky reaction. A homogeneous two-cluster system (two clusters with equal cluster size) displays antiphase patterns. Heterogenous two-cluster systems (two clusters with different sizes) display both phase-locked and localized patterns depending on the parameter values. In a localized pattern the oscillation amplitude of the largest cluster is roughly an order of magnitude smaller than the oscillation amplitude of the smaller cluster, reflecting the effect of self-inhibition exerted by the global feedback term. The transition from phase-locked to localized cluster patterns occurs as the intensity of global feedback increases. Three qualitatively different basic mechanisms, described previously for a globally coupled FitzHugh-Nagumo model, are involved in the generation of the observed patterns. The swing-and-release mechanism is related to the canard phenomenon (canard explosion of limit cycles) in relaxation oscillators. The hold-and-release and hold-and-escape mechanisms are related to the release and escape mechanisms in synaptically connected neural models. The methods we use can be extended to the investigation of oscillatory chemical reactions with other types of non-local coupling.
Collapse
Affiliation(s)
- Horacio G Rotstein
- Department of Mathematical Sciences, New Jersey Institute of Technology, Newark, New Jersey 07102, USA.
| | | |
Collapse
|
8
|
Investigation of the CO oxidation rate oscillations using electrochemical promotion of catalysis over sputtered-Pt films interfaced with YSZ. Electrochem commun 2010. [DOI: 10.1016/j.elecom.2010.07.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
9
|
Claussen JC, Nagler J, Schuster HG. Sierpinski signal generates 1/f alpha spectra. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2004; 70:032101. [PMID: 15524560 DOI: 10.1103/physreve.70.032101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2003] [Accepted: 01/23/2004] [Indexed: 05/24/2023]
Abstract
We investigate the row sum of the binary pattern generated by the Sierpinski automaton: Interpreted as a time series we calculate the power spectrum of this Sierpinski signal analytically and obtain a unique rugged fine structure with underlying power law decay with an exponent of approximately 1.15. Despite the simplicity of the model, it can serve as a model for 1/f(alpha) spectra in a certain class of experimental and natural systems such as catalytic reactions and mollusc patterns.
Collapse
Affiliation(s)
- Jens Christian Claussen
- Institut für Theoretische Physik und Astrophysik, Universität Kiel, Leibnizstrasse 15, D-24098 Kiel, Germany
| | | | | |
Collapse
|
10
|
Kiss IZ, Brackett AW, Hudson JL. Nonuniform Reaction Rates during CO and CO/H2 Oxidation on Coupled Pt Electrodes. J Phys Chem B 2004. [DOI: 10.1021/jp0494943] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- István Z. Kiss
- Department of Chemical Engineering, 102 Engineers' Way, University of Virginia, Charlottesville, Virginia 22904-4741
| | - Andrew W. Brackett
- Department of Chemical Engineering, 102 Engineers' Way, University of Virginia, Charlottesville, Virginia 22904-4741
| | - John L. Hudson
- Department of Chemical Engineering, 102 Engineers' Way, University of Virginia, Charlottesville, Virginia 22904-4741
| |
Collapse
|
11
|
Peskov NV, Slinko MM, Jaeger NI. Stochastic model of reaction rate oscillations during CO oxidation over zeolite-supported catalysts. Chem Eng Sci 2003. [DOI: 10.1016/j.ces.2002.12.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
12
|
Zhai Y, Kiss IZ, Hudson JL. Emerging Coherence of Oscillating Chemical Reactions on Arrays: Experiments and Simulations. Ind Eng Chem Res 2003. [DOI: 10.1021/ie030164z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yumei Zhai
- Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, Charlottesville, Virginia 22904-4741
| | - István Z. Kiss
- Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, Charlottesville, Virginia 22904-4741
| | - John L. Hudson
- Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, Charlottesville, Virginia 22904-4741
| |
Collapse
|
13
|
Peskov NV, Slinko MM, Jaeger NI. Mathematical model of reaction rate oscillations on a chain of nm-sized catalyst particles. J Chem Phys 2003. [DOI: 10.1063/1.1566940] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
14
|
Peskov NV, Slinko MM, Jaeger NI. Stochastic model of reaction rate oscillations in the CO oxidation on nm-sized palladium particles. J Chem Phys 2002. [DOI: 10.1063/1.1429234] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
15
|
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]
|
16
|
Ohlhoff A, Engel H. Flow-mediated spatial coupling during CO oxidation on a palladium-supported catalyst in a continuous-flow reactor. Catal Today 2001. [DOI: 10.1016/s0920-5861(01)00343-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
17
|
Influence of time delayed global feedback on pattern formation in oscillatory CO oxidation on Pt(1 1 0). Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00936-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
18
|
Yuranov I, Kiwi-Minsker L, Slin'ko M, Kurkina E, Tolstunova E, Renken A. Oscillatory behavior during CO oxidation over Pd supported on glass fibers: experimental study and mathematical modeling. Chem Eng Sci 2000. [DOI: 10.1016/s0009-2509(99)00557-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
19
|
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
|