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Kato S, Matam SK, Kerger P, Bernard L, Battaglia C, Vogel D, Rohwerder M, Züttel A. The Origin of the Catalytic Activity of a Metal Hydride in CO
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Reduction. Angew Chem Int Ed Engl 2016; 55:6028-32. [DOI: 10.1002/anie.201601402] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 03/09/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Shunsuke Kato
- École Polytechnique Fédérale de Lausanne (EPFL) 1951 Sion Switzerland
| | - Santhosh Kumar Matam
- Empa, Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf Switzerland
| | - Philipp Kerger
- Max-Planck-Institut für Eisenforschung GmbH 40237 Düsseldorf Germany
| | - Laetitia Bernard
- Empa, Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf Switzerland
| | - Corsin Battaglia
- Empa, Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf Switzerland
| | - Dirk Vogel
- Max-Planck-Institut für Eisenforschung GmbH 40237 Düsseldorf Germany
| | - Michael Rohwerder
- Max-Planck-Institut für Eisenforschung GmbH 40237 Düsseldorf Germany
| | - Andreas Züttel
- École Polytechnique Fédérale de Lausanne (EPFL) 1951 Sion Switzerland
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2
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Kato S, Matam SK, Kerger P, Bernard L, Battaglia C, Vogel D, Rohwerder M, Züttel A. The Origin of the Catalytic Activity of a Metal Hydride in CO
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Reduction. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601402] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shunsuke Kato
- École Polytechnique Fédérale de Lausanne (EPFL) 1951 Sion Switzerland
| | - Santhosh Kumar Matam
- Empa, Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf Switzerland
| | - Philipp Kerger
- Max-Planck-Institut für Eisenforschung GmbH 40237 Düsseldorf Germany
| | - Laetitia Bernard
- Empa, Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf Switzerland
| | - Corsin Battaglia
- Empa, Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf Switzerland
| | - Dirk Vogel
- Max-Planck-Institut für Eisenforschung GmbH 40237 Düsseldorf Germany
| | - Michael Rohwerder
- Max-Planck-Institut für Eisenforschung GmbH 40237 Düsseldorf Germany
| | - Andreas Züttel
- École Polytechnique Fédérale de Lausanne (EPFL) 1951 Sion Switzerland
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Huber L, Ruch P, Hauert R, Saucke G, Matam SK, Michel B, Koebel MM. Monolithic nitrogen-doped carbon as a water sorbent for high-performance adsorption cooling. RSC Adv 2016. [DOI: 10.1039/c6ra00548a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the present study, we report on the development of monolithic, resin-based carbon adsorbents for adsorption heat pumps optimized for water as a sorbent.
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Affiliation(s)
- Lukas Huber
- Empa Swiss Federal Laboratories for Material Science & Technology
- Laboratory for Building Energy Materials and Components
- CH-8600 Dübendorf
- Switzerland
| | | | - Roland Hauert
- Empa Swiss Federal Laboratories for Material Science & Technology
- Laboratory for Joining Technologies and Corrosion
- CH-8600 Dübendorf
- Switzerland
| | - Gesine Saucke
- Empa Swiss Federal Laboratories for Material Science & Technology
- Materials for Energy Conversion Laboratory
- CH-8600 Dübendorf
- Switzerland
| | - Santhosh Kumar Matam
- Empa Swiss Federal Laboratories for Material Science & Technology
- Materials for Energy Conversion Laboratory
- CH-8600 Dübendorf
- Switzerland
| | | | - Matthias M. Koebel
- Empa Swiss Federal Laboratories for Material Science & Technology
- Laboratory for Building Energy Materials and Components
- CH-8600 Dübendorf
- Switzerland
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Huber L, Ruch P, Hauert R, Matam SK, Saucke G, Yoon S, Zhang Y, Koebel MM. Water sorption behavior of physically and chemically activated monolithic nitrogen doped carbon for adsorption cooling. RSC Adv 2016. [DOI: 10.1039/c6ra18660b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work, nitrogen doped resorcinol–melamine–formaldehyde (RMF) resins were synthesized, pyrolyzed and physically activated with CO2.
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Affiliation(s)
- Lukas Huber
- Empa
- Swiss Federal Laboratories for Materials Science and Technology
- Laboratory for Building Energy Materials and Components
- CH-8600 Dübendorf
- Switzerland
| | | | - Roland Hauert
- Empa
- Swiss Federal Laboratories for Materials Science and Technology
- Laboratory for Joining Technologies & Corrosion
- CH-8600 Dübendorf
- Switzerland
| | - Santhosh Kumar Matam
- Empa
- Swiss Federal Laboratories for Materials Science and Technology
- Materials for Energy Conversion Laboratory
- CH-8600 Dübendorf
- Switzerland
| | - Gesine Saucke
- Empa
- Swiss Federal Laboratories for Materials Science and Technology
- Materials for Energy Conversion Laboratory
- CH-8600 Dübendorf
- Switzerland
| | - Songhak Yoon
- Empa
- Swiss Federal Laboratories for Materials Science and Technology
- Materials for Energy Conversion Laboratory
- CH-8600 Dübendorf
- Switzerland
| | - Yucheng Zhang
- Empa
- Swiss Federal Laboratories for Materials Science and Technology
- Electron Microscopy Center
- CH-8600 Dübendorf
- Switzerland
| | - Matthias M. Koebel
- Empa
- Swiss Federal Laboratories for Materials Science and Technology
- Laboratory for Building Energy Materials and Components
- CH-8600 Dübendorf
- Switzerland
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Kuc J, Neumann M, Armbrüster M, Yoon S, Zhang Y, Erni R, Weidenkaff A, Matam SK. Methanol steam reforming catalysts derived by reduction of perovskite-type oxides LaCo1−x−yPdxZnyO3±δ. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01410g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pd–Zn nanoparticles are synthesized by reduction of LaCo1−x−yPdxZnyO3±δ for methanol steam reforming and they can be reintegrated into the perovskite crystal on reoxidation.
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Affiliation(s)
- Jagoda Kuc
- Empa, Swiss Federal Laboratories for Materials Science and Technology
- CH-8600 Dübendorf
- Switzerland
| | - Matthias Neumann
- Max-Planck-Institut für Chemische Physik fester Stoffe
- D-01187 Dresden
- Germany
| | - Marc Armbrüster
- Materials for Innovative Energy Concepts
- Institute of Chemistry
- Faculty of Natural Sciences
- Technische Universität Chemnitz
- D-09107 Chemnitz
| | - Songhak Yoon
- Empa, Swiss Federal Laboratories for Materials Science and Technology
- CH-8600 Dübendorf
- Switzerland
| | - Yucheng Zhang
- Electron Microscopy Center
- Empa, Swiss Federal Laboratories for Materials Science and Technology
- CH-8600 Dübendorf
- Switzerland
| | - Rolf Erni
- Electron Microscopy Center
- Empa, Swiss Federal Laboratories for Materials Science and Technology
- CH-8600 Dübendorf
- Switzerland
| | - Anke Weidenkaff
- Materials Chemistry
- Institute for Materials Science
- University of Stuttgart
- D-70569 Stuttgart
- Germany
| | - Santhosh Kumar Matam
- Empa, Swiss Federal Laboratories for Materials Science and Technology
- CH-8600 Dübendorf
- Switzerland
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Zhao S, Jiang B, Maeder T, Muralt P, Kim N, Matam SK, Jeong E, Han YL, Koebel MM. Dimensional and Structural Control of Silica Aerogel Membranes for Miniaturized Motionless Gas Pumps. ACS Appl Mater Interfaces 2015; 7:18803-18814. [PMID: 26244330 DOI: 10.1021/acsami.5b05462] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
With growing public interest in portable electronics such as micro fuel cells, micro gas total analysis systems, and portable medical devices, the need for miniaturized air pumps with minimal electrical power consumption is on the rise. Thus, the development and downsizing of next-generation thermal transpiration gas pumps has been investigated intensively during the last decades. Such a system relies on a mesoporous membrane that generates a thermomolecular pressure gradient under the action of an applied temperature bias. However, the development of highly miniaturized active membrane materials with tailored porosity and optimized pumping performance remains a major challenge. Here we report a systematic study on the manufacturing of aerogel membranes using an optimized, minimal-shrinkage sol-gel process, leading to low thermal conductivity and high air conductance. This combination of properties results in superior performance for miniaturized thermomolecular air pump applications. The engineering of such aerogel membranes, which implies pore structure control and chemical surface modification, requires both chemical processing know-how and a detailed understanding of the influence of the material properties on the spatial flow rate density. Optimal pumping performance was found for devices with integrated membranes with a density of 0.062 g cm(-3) and an average pore size of 142.0 nm. Benchmarking of such low-density hydrophobic active aerogel membranes gave an air flow rate density of 3.85 sccm·cm(-2) at an operating temperature of 400 °C. Such a silica aerogel membrane based system has shown more than 50% higher pumping performance when compared to conventional transpiration pump membrane materials as well as the ability to withstand higher operating temperatures (up to 440 °C). This study highlights new perspectives for the development of miniaturized thermal transpiration air pumps while offering insights into the fundamentals of molecular pumping in three-dimensional open-mesoporous materials.
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Affiliation(s)
- Shanyu Zhao
- EMPA, Swiss Federal Laboratories for Materials Science and Technology , CH-8600 Dübendorf, Switzerland
| | - Bo Jiang
- EPFL, Swiss Federal Institute of Technology Lausanne , CH-1015 Lausanne, Switzerland
| | - Thomas Maeder
- EPFL, Swiss Federal Institute of Technology Lausanne , CH-1015 Lausanne, Switzerland
| | - Paul Muralt
- EPFL, Swiss Federal Institute of Technology Lausanne , CH-1015 Lausanne, Switzerland
| | - Nayoung Kim
- EMPA, Swiss Federal Laboratories for Materials Science and Technology , CH-8600 Dübendorf, Switzerland
| | - Santhosh Kumar Matam
- EMPA, Swiss Federal Laboratories for Materials Science and Technology , CH-8600 Dübendorf, Switzerland
| | - Eunho Jeong
- EMPA, Swiss Federal Laboratories for Materials Science and Technology , CH-8600 Dübendorf, Switzerland
| | - Yen-Lin Han
- Seattle University , Seattle, Washington 98122, United States
| | - Matthias M Koebel
- EMPA, Swiss Federal Laboratories for Materials Science and Technology , CH-8600 Dübendorf, Switzerland
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Lafi AAHF, Matam SK, Hodali HA. New Synthesis of ZSM-5 from High-Silica Kaolinite and Its Use in Vapor-Phase Conversion of 1-Phenylethanol to Styrene. Ind Eng Chem Res 2015. [DOI: 10.1021/ie505004k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Santhosh Kumar Matam
- Laboratory Materials for
Energy Conversion, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Duebendorf, Switzerland
| | - Hamdallah A. Hodali
- Department of Chemistry,
Faculty of Sciences, The University of Jordan, Amman 11942, Jordan
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Marchionni V, Newton MA, Kambolis A, Matam SK, Weidenkaff A, Ferri D. A modulated excitation ED-EXAFS/DRIFTS study of hydrothermal ageing of Rh/Al2O3. Catal Today 2014. [DOI: 10.1016/j.cattod.2013.10.082] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Lu Y, Eyssler A, Otal EH, Matam SK, Brunko O, Weidenkaff A, Ferri D. Influence of the synthesis method on the structure of Pd-substituted perovskite catalysts for methane oxidation. Catal Today 2013. [DOI: 10.1016/j.cattod.2012.10.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ferri D, Newton MA, Di Michiel M, Yoon S, Chiarello GL, Marchionni V, Matam SK, Aguirre MH, Weidenkaff A, Wen F, Gieshoff J. Synchrotron high energy X-ray methods coupled to phase sensitive analysis to characterize aging of solid catalysts with enhanced sensitivity. Phys Chem Chem Phys 2013; 15:8629-39. [PMID: 23657925 DOI: 10.1039/c3cp44638g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
X-ray absorption spectroscopy and X-ray diffraction are suitable probes of the chemical state of a catalyst under working conditions but are limited to bulk information. Here we show in two case studies related to hydrothermal aging and chemical modification of model automotive catalysts that enhanced detailed information of structural changes can be obtained when the two methods are combined with a concentration modulated excitation (cME) approach and phase sensitive detection (PSD). The catalysts are subject to a modulation experiment consisting of the periodic variation of the gas feed composition to the catalyst and the time-resolved data are additionally treated by PSD. In the case of a 2 wt% Rh/Al2O3 catalyst, a very small fraction (ca. 2%) of Rh remaining exposed at the alumina surface after hydrothermal aging at 1273 K can be detected by PSD. This Rh is sensitive to the red-ox oscillations of the experiment and is likely responsible for the observed catalytic activity and selectivity during NO reduction by CO. In the case of a 1.6 wt% Pd/Al2O3-Ce(1-x)Zr(x)O2 catalyst, preliminary results of cME-XRD demonstrate that access to the kinetics of the whole material at work can be obtained. Both the red-ox processes involving the oxygen storage support and the Pd component can be followed with great precision. PSD enables the differentiation between Pd deposited on Al2O3 or on Ce(1-x)Zr(x)O2. Modification of the catalyst by phosphorous clearly induces loss of the structural dynamics required for oxygen storage capacity that is provided by the Ce(4+)/Ce(3+) pair. The two case studies demonstrate that detailed kinetics of subtle changes can be uncovered by the combination of in situ X-ray absorption and high energy diffraction methods with PSD.
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Affiliation(s)
- Davide Ferri
- Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
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Matam SK, Newton MA, Weidenkaff A, Ferri D. Time resolved operando spectroscopic study of the origin of phosphorus induced chemical aging of model three-way catalysts Pd/Al2O3. Catal Today 2013. [DOI: 10.1016/j.cattod.2012.10.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Matam SK, Chiarello GL, Lu Y, Weidenkaff A, Ferri D. PdO x /Pd at Work in a Model Three-Way Catalyst for Methane Abatement Monitored by Operando XANES. Top Catal 2013. [DOI: 10.1007/s11244-013-9960-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Eyssler A, Lu Y, Matam SK, Weidenkaff A, Ferri D. Perovskite-supported palladium for methane oxidation - structure-activity relationships. Chimia (Aarau) 2012; 66:675-80. [PMID: 23211725 DOI: 10.2533/chimia.2012.675] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Palladium is the precious metal of choice for methane oxidation and perovskite-type oxides offer the possibility to stabilize it as PdO, considered crucial for catalytic activity. Pd can adopt different oxidation and coordination states when associated with perovskite-type oxides. Here, we review our work on the effect of perovskite composition on the oxidation and coordination states of Pd and its influence on catalytic activity for methane oxidation in the case of typical Mn, Fe and Co perovskite-based oxidation catalysts. Especially X-ray absorption near edge structure (XANES) spectroscopy is shown to be crucial to fingerprint the different coordination states of Pd. Pd substitutes Fe and Co in the octahedral sites but without modifying catalytic activity with respect to the Pd-free perovskite. On LaMnO(3) palladium is predominantly exposed at the surface thus bestowing catalytic activity for methane oxidation. However, the occupancy of B-cation sites of the perovskite structure by Pd can be exploited to cyclically activate Pd and to protect it from particle growth. This is explicitly demonstrated for La(Fe, Pd)O(3), where catalytic activity for methane oxidation is enhanced under oscillating redox conditions at 500 °C, therefore paving the way to the practical application in three-way catalysts for stoichiometric natural gas engines.
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Affiliation(s)
- Arnim Eyssler
- Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
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Matam SK, Otal E, Aguirre M, Winkler A, Ulrich A, Rentsch D, Weidenkaff A, Ferri D. Thermal and chemical aging of model three-way catalyst Pd/Al2O3 and its impact on the conversion of CNG vehicle exhaust. Catal Today 2012. [DOI: 10.1016/j.cattod.2011.09.030] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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