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De Coster V, Srinath NV, Yazdani P, Poelman H, Galvita VV. Modulation Engineering: Stimulation Design for Enhanced Kinetic Information from Modulation-Excitation Experiments on Catalytic Systems. ACS Catal 2023. [DOI: 10.1021/acscatal.3c00646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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Clark AH, Steiger P, Bornmann B, Hitz S, Frahm R, Ferri D, Nachtegaal M. Fluorescence-detected quick-scanning X-ray absorption spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2020; 27:681-688. [PMID: 32381768 PMCID: PMC7285694 DOI: 10.1107/s1600577520002350] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 02/19/2020] [Indexed: 06/01/2023]
Abstract
Time-resolved X-ray absorption spectroscopy (XAS) offers the possibility to monitor the state of materials during chemical reactions. While this technique has been established for transmission measurements for a number of years, XAS measurements in fluorescence mode are challenging because of limitations in signal collection as well as detectors. Nevertheless, measurements in fluorescence mode are often the only option to study complex materials containing heavy matrices or in samples where the element of interest is in low concentration. Here, it has been demonstrated that high-quality quick-scanning full extended X-ray absorption fine-structure data can be readily obtained with sub-second time resolution in fluorescence mode, even for highly diluted samples. It has also been demonstrated that in challenging samples, where transmission measurements are not feasible, quick fluorescence can yield significant insight in reaction kinetics. By studying the fast high-temperature oxidation of a reduced LaFe0.8Ni0.8O3 perovskite type, an example where the perovskite matrix elements prevent measurements in fluorescence, it is shown that it is now possible to follow the state of Ni in situ at a 3 s time resolution.
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Affiliation(s)
- Adam H. Clark
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | | | | | - Stephan Hitz
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Ronald Frahm
- Bergische Universität Wuppertal, D-42119 Wuppertal, Germany
| | - Davide Ferri
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
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Pieber SM, Kambolis A, Ferri D, Bhattu D, Bruns EA, Elsener M, Kröcher O, Prévôt ASH, Baltensperger U. Mitigation of Secondary Organic Aerosol Formation from Log Wood Burning Emissions by Catalytic Removal of Aromatic Hydrocarbons. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:13381-13390. [PMID: 30351026 DOI: 10.1021/acs.est.8b04124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Log wood burning is a significant source of volatile organic compounds including aromatic hydrocarbons (ArHC). ArHC are harmful, are reactive in the ambient atmosphere, and are important secondary organic aerosol (SOA) precursors. Consequently, SOA represents a major fraction of the sub-micron organic aerosol pollution from log wood burning. ArHC reduction is thus critical in the mitigation of adverse health and environmental effects of log wood burning. In this study, two Pt-based catalytic converters were prepared and tested for the mitigation of real-world log wood burning emissions, including ArHC and SOA formation, as well as toxic carbon monoxide and methane, a greenhouse gas. Substantial removal of mono- and polycyclic ArHC and phenolic compounds was achieved with both catalysts operated at realistic chimney temperatures (50% conversion was achieved at 200 and 300 °C for non-methane hydrocarbons in our experiments for Pt/Al2O3 and Pt/CeO2-Al2O3, respectively). The catalytically cleaned emissions exhibited a substantially reduced SOA formation already at temperatures as low as 185-310 °C. This reduces the sub-micron PM burden of log wood burning significantly. Thus, catalytic converters can effectively reduce primary and secondary log wood burning pollutants and, thereby, their adverse health impacts and environmental effects.
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Affiliation(s)
- Simone M Pieber
- Paul Scherrer Institute , Laboratory of Atmospheric Chemistry , 5232 Villigen , Switzerland
- Empa, Laboratory for Air Pollution and Environmental Technology , 8600 Duebendorf , Switzerland
| | - Anastasios Kambolis
- Paul Scherrer Institute , Bioenergy and Catalysis Laboratory , 5232 Villigen , Switzerland
| | - Davide Ferri
- Paul Scherrer Institute , Bioenergy and Catalysis Laboratory , 5232 Villigen , Switzerland
| | - Deepika Bhattu
- Paul Scherrer Institute , Laboratory of Atmospheric Chemistry , 5232 Villigen , Switzerland
| | - Emily A Bruns
- Paul Scherrer Institute , Laboratory of Atmospheric Chemistry , 5232 Villigen , Switzerland
| | - Martin Elsener
- Paul Scherrer Institute , Bioenergy and Catalysis Laboratory , 5232 Villigen , Switzerland
| | - Oliver Kröcher
- Paul Scherrer Institute , Bioenergy and Catalysis Laboratory , 5232 Villigen , Switzerland
- École polytechnique fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - André S H Prévôt
- Paul Scherrer Institute , Laboratory of Atmospheric Chemistry , 5232 Villigen , Switzerland
| | - Urs Baltensperger
- Paul Scherrer Institute , Laboratory of Atmospheric Chemistry , 5232 Villigen , Switzerland
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Guda AA, Bugaev AL, Kopelent R, Braglia L, Soldatov AV, Nachtegaal M, Safonova OV, Smolentsev G. Fluorescence-detected XAS with sub-second time resolution reveals new details about the redox activity of Pt/CeO 2 catalyst. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:989-997. [PMID: 29979160 PMCID: PMC6038606 DOI: 10.1107/s1600577518005325] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 04/04/2018] [Indexed: 06/02/2023]
Abstract
A setup for fluorescence-detected X-ray absorption spectroscopy (XAS) with sub-second time resolution has been developed. This technique allows chemical speciation of low-concentrated materials embedded in highly absorbing matrices, which cannot be studied using transmission XAS. Using this setup, the reactivity of 1.5 wt% Pt/CeO2 catalyst was studied with 100 ms resolution during periodic cycling in CO- and oxygen-containing atmospheres in a plug-flow reactor. Measurements were performed at the Pt L3- and Ce L3-edges. The reactivity of platinum and cerium demonstrated a strong correlation. The oxidation of the catalyst starts on the ceria support helping the oxidation of platinum nanoparticles. The new time-resolved XAS setup can be applied to various systems, capable of reproducible cycling between different states triggered by gas atmosphere, light, temperature, etc. It opens up new perspectives for mechanistic studies on automotive catalysts, selective oxidation catalysts and photocatalysts.
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Affiliation(s)
- Alexander A. Guda
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
| | - Aram L. Bugaev
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
- Department of Chemistry, NIS and CrisDi Interdepartmental Centres, asn INST Reference Center, University of Turin, Via P. Giuria 7, Turin 10125, Italy
| | | | - Luca Braglia
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
- Department of Chemistry, NIS and CrisDi Interdepartmental Centres, asn INST Reference Center, University of Turin, Via P. Giuria 7, Turin 10125, Italy
| | - Alexander V. Soldatov
- The Smart Materials Research Center, Southern Federal University, Sladkova 174/28, Rostov-on-Don 344090, Russian Federation
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Gänzler AM, Casapu M, Maurer F, Störmer H, Gerthsen D, Ferré G, Vernoux P, Bornmann B, Frahm R, Murzin V, Nachtegaal M, Votsmeier M, Grunwaldt JD. Tuning the Pt/CeO2 Interface by in Situ Variation of the Pt Particle Size. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00330] [Citation(s) in RCA: 115] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Andreas M. Gänzler
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Florian Maurer
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Heike Störmer
- Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT), Engesserstraße 7, 76131 Karlsruhe, Germany
| | - Dagmar Gerthsen
- Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT), Engesserstraße 7, 76131 Karlsruhe, Germany
| | - Géraldine Ferré
- Université de Lyon, Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON), UMR 5256, CNRS, Université Claude Bernard Lyon 1, 2 avenue A. Einstein, 69626 Villeurbanne, France
| | - Philippe Vernoux
- Université de Lyon, Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON), UMR 5256, CNRS, Université Claude Bernard Lyon 1, 2 avenue A. Einstein, 69626 Villeurbanne, France
| | - Benjamin Bornmann
- Department of Physics, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
| | - Ronald Frahm
- Department of Physics, University of Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
| | - Vadim Murzin
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - Maarten Nachtegaal
- Paul Scherrer Institute (PSI), PSI Aarebrücke, 5232 Villigen, Switzerland
| | - Martin Votsmeier
- Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63457 Hanau, Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
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6
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Müller P, Hermans I. Applications of Modulation Excitation Spectroscopy in Heterogeneous Catalysis. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b04855] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Philipp Müller
- Department of Chemistry & Department of Chemical Engineering, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Ive Hermans
- Department of Chemistry & Department of Chemical Engineering, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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