Maria Casapu
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View article: Tailoring the active sites in Cu-SSZ-13 as a catalyst for the selective catalytic reduction of NH3 to minimize HCHO and HCN emissions
Tailoring the active sites in Cu-SSZ-13 as a catalyst for the selective catalytic reduction of NH3 to minimize HCHO and HCN emissions Open
Synthetic fuels are promising candidates for achieving carbon neutrality and lowering soot formation. However, their combustion leads to notable amounts of formaldehyde and other oxygenates. These emissions further affect the selective cat…
View article: Influence of the CeO<sub>2</sub> Morphology and Initial Pd–Pt Interaction Degree on Catalyst Activity and Stability
Influence of the CeO<sub>2</sub> Morphology and Initial Pd–Pt Interaction Degree on Catalyst Activity and Stability Open
View article: Tracking Sulfur Poisoning of Pd/Al<sub>2</sub>O<sub>3</sub> Catalysts for Methane Oxidation on Different Complexity Scales
Tracking Sulfur Poisoning of Pd/Al<sub>2</sub>O<sub>3</sub> Catalysts for Methane Oxidation on Different Complexity Scales Open
Understanding the deactivation induced by sulfur poisoning is crucial for designing more efficient palladium-based monolithic catalysts for methane oxidation. This study employs advanced characterization techniques, including X-ray absorpt…
View article: Confining the Synthesis of Palladium Nanoparticles in Mesoporous Silicas for CO Oxidation: The Role of the Support
Confining the Synthesis of Palladium Nanoparticles in Mesoporous Silicas for CO Oxidation: The Role of the Support Open
The synthesis of palladium (Pd) nanoparticles (NPs) in the highly constrained pore network of mesoporous silicas is systematically investigated for the first time, comparing the synthesis outcomes with a reference sample of Pd NPs on the o…
View article: Novel and more facile synthesis of highly dispersed iron in small-pore zeolites by ion exchange for catalytic applications
Novel and more facile synthesis of highly dispersed iron in small-pore zeolites by ion exchange for catalytic applications Open
In this work, we demonstrate a simple strategy for ion-exchange of iron at the exchange sites of small-pore zeolites by in situ generation of Fe 2+ .
View article: High-porosity Pt–CeO<sub>2</sub> nanosponges as oxidation catalyst
High-porosity Pt–CeO<sub>2</sub> nanosponges as oxidation catalyst Open
A highly porous Pt–CeO 2 nanosponge catalyst is obtained by thermal transformation from a cerium oxalate precursor, showing good thermal stability and promising activity for catalytic oxidation of CO, VOCs, NH 3 with high selectivity for N…
View article: Lifecycle of Pd Clusters: Following the Formation and Evolution of Active Pd Clusters on Ceria During CO Oxidation by In Situ/Operando Characterization Techniques
Lifecycle of Pd Clusters: Following the Formation and Evolution of Active Pd Clusters on Ceria During CO Oxidation by In Situ/Operando Characterization Techniques Open
For maximizing the atomic efficiency in noble metal-based catalysts, dedicated preparation routes and high lifetime are essential. Both aspects require an in-depth understanding of the fate of noble metal atoms under reaction conditions. F…
View article: Pd loading threshold for an efficient noble metal use in Pd/CeO2 methane oxidation catalysts
Pd loading threshold for an efficient noble metal use in Pd/CeO2 methane oxidation catalysts Open
International audience
View article: <i>L</i> <sub>3</sub>-edge X-ray spectroscopy of rhodium and palladium compounds
<i>L</i> <sub>3</sub>-edge X-ray spectroscopy of rhodium and palladium compounds Open
L 3 -edge high-energy-resolution fluorescence-detection X-ray absorption near-edge structure (XANES) spectra for palladium and rhodium compounds are presented, with focus on their electronic structures. The data are compared with transmiss…
View article: Highly Active Oxidation Catalysts through Confining Pd Clusters on CeO<sub>2</sub> Nano‐Islands
Highly Active Oxidation Catalysts through Confining Pd Clusters on CeO<sub>2</sub> Nano‐Islands Open
CeO 2 ‐supported noble metal clusters are attractive catalytic materials for several applications. However, their atomic dispersion under oxidizing reaction conditions often leads to catalyst deactivation. In this study, the noble metal cl…
View article: Highly Active Oxidation Catalysts through Confining Pd Clusters on CeO<sub>2</sub> Nano‐Islands
Highly Active Oxidation Catalysts through Confining Pd Clusters on CeO<sub>2</sub> Nano‐Islands Open
CeO 2 ‐supported noble metal clusters are attractive catalytic materials for several applications. However, their atomic dispersion under oxidizing reaction conditions often leads to catalyst deactivation. In this study, the noble metal cl…
View article: Structural Changes of Ni and Ni–Pt Methane Steam Reforming Catalysts During Activation, Reaction, and Deactivation Under Dynamic Reaction Conditions
Structural Changes of Ni and Ni–Pt Methane Steam Reforming Catalysts During Activation, Reaction, and Deactivation Under Dynamic Reaction Conditions Open
Ni-based catalysts are the most widely used materials to produce H2 in large-scale methane steam reformers under stationary conditions. For domestic applications such as fuel cells, H2 production involves the exposure…
View article: Versatile Spectroscopic Cell for <i>Operando</i> Studies in Heterogeneous Catalysis Using Tender X‐ray Spectroscopy in Fluorescence Mode
Versatile Spectroscopic Cell for <i>Operando</i> Studies in Heterogeneous Catalysis Using Tender X‐ray Spectroscopy in Fluorescence Mode Open
The design and commissioning of a cell suitable for operando studies using high‐energy‐resolution fluorescence‐detected X‐ray absorption near‐edge structure (HERFD‐XANES) spectroscopy in the tender X‐ray regime is reported. The cell is opt…
View article: A laboratory scale fast feedback characterization loop for optimizing coated catalysts for emission control
A laboratory scale fast feedback characterization loop for optimizing coated catalysts for emission control Open
This work presents a fast and non-invasive photo-based channel analysis approach, which helps to screen and understand the effects of different coating parameters on the activity of noble metal-based oxidation catalyst coated on a ceramic …
View article: A review on exhaust gas after-treatment of lean-burn natural gas engines – From fundamentals to application
A review on exhaust gas after-treatment of lean-burn natural gas engines – From fundamentals to application Open
Modern lean-operated internal combustion engines running on natural gas, biogas or methane produced from wind or solar energy are highly fuel-efficient and can greatly contribute to securing energy supply, e.g. by mitigating fluctuations i…
View article: Identifying the Structure of Supported Metal Catalysts Using Vibrational Fingerprints from Ab Initio Nanoscale Models (Small 34/2023)
Identifying the Structure of Supported Metal Catalysts Using Vibrational Fingerprints from Ab Initio Nanoscale Models (Small 34/2023) Open
Pd Nanocatalysts Ceria-supported palladium nanoparticles exposed to carbon monoxide have been investigated by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements and density functional theory (DFT) calculation…
View article: Identifying the Structure of Supported Metal Catalysts Using Vibrational Fingerprints from Ab Initio Nanoscale Models
Identifying the Structure of Supported Metal Catalysts Using Vibrational Fingerprints from Ab Initio Nanoscale Models Open
Identifying active sites of supported noble metal nanocatalysts remains challenging, since their size and shape undergo changes depending on the support, temperature, and gas mixture composition. Herein, the anharmonic infrared spectrum of…
View article: Methane Oxidation over PdO: Towards a Better Understanding of the Influence of the Support Material
Methane Oxidation over PdO: Towards a Better Understanding of the Influence of the Support Material Open
The presence of water vapor during the oxidation of the strong greenhouse gas methane over PdO‐based catalysts is known to result in severe inhibition and catalyst deactivation. In this context, our current study elucidates the role of the…
View article: Dynamics of the Reversible Inhibition during Methane Oxidation on Bimetallic Pd‐Pt Catalysts Studied by Modulation‐Excitation XAS and DRIFTS
Dynamics of the Reversible Inhibition during Methane Oxidation on Bimetallic Pd‐Pt Catalysts Studied by Modulation‐Excitation XAS and DRIFTS Open
Water and NO reversibly inhibit catalytic methane oxidation to CO 2 over Pd/Al 2 O 3 and Pd−Pt/Al 2 O 3 at temperatures near 50 % conversion. Modulation‐excitation X‐ray absorption spectroscopy (ME‐XAS) was used to characterize the interac…
View article: Coexisting phases of Pd-ceria catalysts for methane oxidation explored by a joint theoretical and experimental vibrational study
Coexisting phases of Pd-ceria catalysts for methane oxidation explored by a joint theoretical and experimental vibrational study Open
International audience
View article: Dynamic Structural Evolution of Ceria-Supported Pt Particles: A Thorough Spectroscopic Study
Dynamic Structural Evolution of Ceria-Supported Pt Particles: A Thorough Spectroscopic Study Open
CeO2-supported Pt nanoparticles are of prominent technological interest due to their excellent dispersion and thus performance in a wide range of catalytic reactions. In this study, the dynamic structural evolution of Pt supported on ceria…
View article: Surface Noble Metal Concentration on Ceria as a Key Descriptor for Efficient Catalytic CO Oxidation
Surface Noble Metal Concentration on Ceria as a Key Descriptor for Efficient Catalytic CO Oxidation Open
During the CO oxidation over metallic Pt clusters and Pt nanoparticles in Pt/CeO2 catalysts, we found that the Pt surface concentration is a key descriptor for the reaction rate. By increasing the surface noble metal concentration (SNMC) o…
View article: Understanding the multiple interactions in vanadium-based SCR catalysts during simultaneous NO<sub><i>x</i></sub> and soot abatement
Understanding the multiple interactions in vanadium-based SCR catalysts during simultaneous NO<sub><i>x</i></sub> and soot abatement Open
The multiple interactions during simultaneous removal of soot and NO x were systematically studied over a V-based catalyst, which is highly relevant for the development of more efficient 2-way SCRonDPF systems.
View article: Present Challenges in Catalytic Emission Control for Internal Combustion Engines
Present Challenges in Catalytic Emission Control for Internal Combustion Engines Open
Mobility in the modern world relies on heterogeneous catalysis [...]
View article: Catalytic CO Oxidation and H2O2 Direct Synthesis over Pd and Pt-Impregnated Titania Nanotubes
Catalytic CO Oxidation and H2O2 Direct Synthesis over Pd and Pt-Impregnated Titania Nanotubes Open
Titania nanotubes (TNTs) impregnated with Pd and Pt nanoparticles are evaluated as heterogeneous catalysts in different conditions in two reactions: catalytic CO oxidation (gas phase, up to 500 °C) and H2O2 direct synthesis (liquid phase, …
View article: Insights into the Structural Dynamics of Pt/CeO2 Single-Site Catalysts during CO Oxidation
Insights into the Structural Dynamics of Pt/CeO2 Single-Site Catalysts during CO Oxidation Open
Despite their high atomic dispersion, single site catalysts with Pt supported on CeO2 were found to have a low activity during oxidation reactions. In this study, we report the behavior of Pt/CeO2 single site catalyst under more complex ga…
View article: Spatiotemporal Investigation of the Temperature and Structure of a Pt/CeO<sub>2</sub> Oxidation Catalyst for CO and Hydrocarbon Oxidation during Pulse Activation
Spatiotemporal Investigation of the Temperature and Structure of a Pt/CeO<sub>2</sub> Oxidation Catalyst for CO and Hydrocarbon Oxidation during Pulse Activation Open
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View article: The Impact of Pressure and Hydrocarbons on NOx Abatement over Cu- and Fe-Zeolites at Pre-Turbocharger Position
The Impact of Pressure and Hydrocarbons on NOx Abatement over Cu- and Fe-Zeolites at Pre-Turbocharger Position Open
Positioning the catalysts in front of the turbocharger has gained interest over recent years due to the earlier onset temperature and positive effect of elevated pressure. However, several challenges must be overcome, like presence of high…
View article: Impact of gas phase reactions and catalyst poisons on the NH3-SCR activity of a V2O5-WO3/TiO2 catalyst at pre-turbine position
Impact of gas phase reactions and catalyst poisons on the NH3-SCR activity of a V2O5-WO3/TiO2 catalyst at pre-turbine position Open
View article: Versatile and high temperature spectroscopic cell for <i>operando</i> fluorescence and transmission x-ray absorption spectroscopic studies of heterogeneous catalysts
Versatile and high temperature spectroscopic cell for <i>operando</i> fluorescence and transmission x-ray absorption spectroscopic studies of heterogeneous catalysts Open
A modular high-temperature cell consisting of a plug-flow microreactor with a fixed catalyst bed and long heating zone has been established for operando x-ray absorption/fluorescence spectroscopic and diffraction studies. The functionality…