Rafał Baran

Sorbonne Université

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Stanisław Dźwigaj

Sorbonne Université

Thomas Onfroy

Laboratoire de Réactivité de Surface

AŚ

Anna Śrębowata

Institute of Physical Chemistry

Teresa Grzybek

AGH University of Krakow

Jean‐Marc Krafft

Laboratoire de Réactivité de Surface

Pieter Glatzel

European Synchrotron Radiation Facility

Yannick Millot

Laboratoire de Réactivité de Surface

Izabela Kamińska

Institute of Physical Chemistry

Frédéric Averseng

Centre National de la Recherche Scientifique

DŁ

Dariusz Łomot

Institute of Physical Chemistry

Cooperative Institutions

Centre National de la Recherche Scientifique

European Synchrotron Radiation Facility

Sorbonne Université

Jagiellonian University

University of Oslo

University of Turin

AGH University of Krakow

Laboratoire de Réactivité de Surface

UPMC Health System

European Science Foundation

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TEXS: in-vacuum tender X-ray emission spectrometer with 11 Johansson crystal analyzers

Journal of Synchrotron Radiation (2020)

Mauro Rovezzi Alistair Harris Blanka Detlefs Timothy Bohdan Artem Svyazhin

We describe the design and show first results of a large solid angle X-ray emission spectrometer that is optimized for energies between 1.5 keV and 5.5 keV. The spectrometer is based on an array of 11 cylindrically bent Johansson crystal analyzers arranged in a non-dispersive Rowland circle geometry. The smallest achievable energy bandwidth is smaller than the core hole lifetime broadening of the absorption edges in this energy range. Energy scanning is achieved using an innovative design, maintaining the Rowland circle conditions for all crystals with only four motor motions. The entire spectrometer is encased in a high-vacuum chamber that allocates a liquid helium cryostat and provides sufficient space for in situ cells and operando catalysis reactors.

Cryostat

Solid angle

Crystal (programming language)

10.1107/s160057752000243x

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Citations (11)

Influence of the preparation procedure on the nature and environment of vanadium in VSiBEA zeolite: XRD, DR UV–vis, NMR, EPR and TPR studies

Microporous and Mesoporous Materials (2012)

Rafał Baran Yannick Millot Thomas Onfroy Frédéric Averseng Jean‐Marc Krafft

Silanol

Oxidation state

10.1016/j.micromeso.2012.05.023

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Citations (24)

Examination of the influence of La promotion on Ni state in hydrotalcite-derived catalysts under CO2 methanation reaction conditions: Operando X-ray absorption and emission spectroscopy investigation

Applied Catalysis B Environment and Energy (2018)

Dominik Wierzbicki Rafał Baran Radosław Dębek Monika Motak María Elena Gálvez

Methanation

Hydrotalcite

Lanthanum

Periclase

10.1016/j.apcatb.2018.03.089

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Citations (103)

Influence of the nature and environment of cobalt on the catalytic activity of Co-BEA zeolites in selective catalytic reduction of NO with ammonia

Microporous and Mesoporous Materials (2016)

Rafał Baran Jean‐Marc Krafft Thomas Onfroy Teresa Grzybek Stanisław Dźwigaj

Selective catalytic reduction

10.1016/j.micromeso.2015.12.061

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Citations (32)

Vanadium incorporation from aqueous NH4VO3 solution into siliceous Beta zeolite determined by NMR with formation of V-single site zeolite catalysts for application in SCR of NO

Applied Catalysis A General (2020)

Rafał Baran Yannick Millot Frédéric Averseng Stanisław Dźwigaj

10.1016/j.apcata.2020.117830

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Citations (8)

Catalytic conversion of trichloroethylene on nickel containing beta zeolites into value added products

Catalysis Communications (2014)

Anna Śrębowata Rafał Baran Dmytro Lisovytskiy Izabela Kamińska Stanisław Dźwigaj

10.1016/j.catcom.2014.08.023

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Citations (9)

Activating effect of cerium in hydrotalcite derived Cu–Mg–Al catalysts for selective ammonia oxidation and the selective reduction of NO with ammonia

Reaction Kinetics Mechanisms and Catalysis (2017)

Sylwia Basąg Klaudia Kocoł Zofia Piwowarska Małgorzata Rutkowska Rafał Baran

Hydrotalcite originated mixed metal Cu–Mg–Al oxide system was doped with various amounts of cerium (0.5 or 3.0 wt%) and tested in the role of catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO) and the selective catalytic reduction of NO with ammonia (NH3-SCR). The activating effect of cerium was observed in both studied processes. However, the CeO2 loading is a very important parameter determining catalytic performance of the studied samples. It was shown that an introduction of cerium into Cu–Mg–Al mixed oxide resulted in its significant activation in the low-temperature NH3-SCR process, independently of the CeO2 loading and a decrease in the efficiency of the NO reduction at higher temperatures, which was more significant for the catalyst with the lower cerium content. In the case of the NH3-SCO process, the introduction of cerium into Cu–Mg–Al mixed oxide resulted in the activation of the low temperature reaction, which was more intensive for the catalyst with lower cerium content. These effects were related to the presence of cerium in the form of crystallites of various size and therefore their different reducibility.

Hydrotalcite

Cerium oxide

Selective catalytic reduction

Mixed oxide

Ammonia production

10.1007/s11144-017-1141-y

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Citations (23)

The Nuclearity of the Active Site for Methane to Methanol Conversion in Cu-Mordenite: A Quantitative Assessment

Journal of the American Chemical Society (2018)

Dimitrios K. Pappas Andrea Martini Michael Dyballa Karoline Kvande Shewangizaw Teketel

The direct conversion of methane to methanol (MTM) is a reaction that has the potential to disrupt a great part of the synthesis gas-derived chemical industry. However, despite many decades of research, active enough catalysts and suitable processes for industrial application are still not available. Recently, several copper-exchanged zeolites have shown considerable activity and selectivity in the direct MTM reaction. Understanding the nature of the active site in these materials is essential for any further development in the field. Herein, we apply multivariate curve resolution analysis of X-ray absorption spectroscopy data to accurately quantify the fraction of active Cu in Cu-MOR (MOR = mordenite), allowing an unambiguous determination of the active site nuclearity as a dicopper site. By rationalizing the compositional parameters and reaction conditions, we achieve the highest methanol yield per Cu yet reported for MTM over Cu-zeolites, of 0.47 mol/mol.

Mordenite

10.1021/jacs.8b08071

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Citations (211)

Ag–Ni bimetallic SiBEA zeolite as an efficient catalyst of hydrodechlorination of 1,2-dichloroethane towards ethylene

Catalysis Communications (2015)

Anna Śrębowata Izabela Zielińska Rafał Baran Grzegorz Słowik Stanisław Dźwigaj

Bimetallic strip

1,2-Dichloroethane

10.1016/j.catcom.2015.06.009

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Citations (13)