A5086042043- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Nanomaterials for catalytic reactions
- Catalysis and Hydrodesulfurization Studies
- X-ray Diffraction in Crystallography
- Advanced Photocatalysis Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Mesoporous Materials and Catalysis
- Nanocluster Synthesis and Applications
- Zeolite Catalysis and Synthesis
- Electron and X-Ray Spectroscopy Techniques
- Catalysts for Methane Reforming
- Advanced Chemical Physics Studies
- Machine Learning in Materials Science
- Asymmetric Hydrogenation and Catalysis
- Ammonia Synthesis and Nitrogen Reduction
- Diamond and Carbon-based Materials Research
- Carbon dioxide utilization in catalysis
- Copper-based nanomaterials and applications
- Catalysis for Biomass Conversion
- Electrochemical Analysis and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallization and Solubility Studies
- TiO2 Photocatalysis and Solar Cells
ALBA Synchrotron (Spain)
2019-2025
Elettra-Sincrotrone Trieste S.C.p.A.
2024
European Synchrotron Radiation Facility
2013-2021
Leibniz Institute for Catalysis
2016-2020
University of Rostock
2016-2020
Rostocker Zentrum zur Erforschung des Demografischen Wandels
2016-2018
Institute of Crystallography
2013-2018
Southern Federal University
2017
European Science Foundation
2017
Hirosaki University
2017
In the typical NH3-SCR temperature range (100-500 °C), ammonia is one of main adsorbed species on acidic sites Cu-SSZ-13 catalyst. Therefore, study at high a key step for understanding its role in catalytic cycle. We employed different spectroscopic techniques to investigate nature complexes occurring upon NH3 interaction. particular, FTIR spectroscopy revealed formation species, that is, (i) bonded copper centers, (ii) Brønsted sites, and (iii) NH4(+)·nNH3 associations. XANES XES allowed us...
The potential of oxide-supported rhodium single atom catalysts (SACs) for heterogeneous hydroformylation was investigated both theoretically and experimentally. Using high-level domain-based local-pair natural orbital coupled cluster singles doubles with perturbative triples contribution (DLPNO-CCSD(T)) calculations, stability catalytic activity were Rh atoms on different oxide surfaces. Atomically dispersed, supported synthesized MgO CeO2. While the CeO2-supported catalyst is found to be...
Coordination polymer Ni2(dhtp)(H2O)2·8H2O is a 3D network that maintains crystallinity and porosity after solvent removal. A mild thermal treatment in high vacuo at 393 K removes not only water physisorbed on the walls of structure but also directly coordinated to Ni(II) sites. This procedure allows us obtain MOF material with honeycomb able strongly coordinate NO. In this contribution characterization CPO-27-Ni respect structural (EXAFS compared XRD), vibrational (IR Raman) electronic (UV,...
Dealumination of NH(4)-Y zeolite during steaming to 873 K was investigated with in situ, time-dependent, synchrotron radiation XRPD and situ Al K-edge XAS. Water desorption is complete at 450 K, ammonium decomposition occurs between 500 550 K. Only a small fraction Al(3+) species (5%) leaves the framework heating from 710 K; these occupy site I' inside sodalite cage. This increases up 8% first 50 min remains constant for following 70 isotherm high-temperature part cooling experiment. During...
Abstract Novel nanostructured catalysts with highly dispersed cobalt have been synthesized by the pyrolysis of metal phenanthroline complexes. Materials significantly different properties were obtained simply tuning metal/ligand ratio. The catalytic potential this class compounds is shown first example dehydrogenation formic acid under catalysis atomically cobalt. From TEM, XPS, and XRD characterization, KSCN poisoning, leaching, formation CoN x species as active site seems key to success...
Platinum nanoparticles dispersed on nanosized ceria are active for CO oxidation at room temperature after hydrogen pretreatment. High angular annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis of the reduced catalyst shows spreading 1 nm sized platinum particles under beam, characteristic a two-dimensional strong metal–support interaction. In situ X-ray absorption fluorescence spectroscopy (XAFS) reveals Pt–O distance 2.1 Å, which is significantly longer than...
Incorporation of silicon atoms into nickel nanoparticles boosts the catalytic activity for (de)hydrogenation reactions.
Activated carbons and related Pd-based catalysts are investigated with a multi-techniques approach, which allows correlating structure performance.
We present three methods of the synthesis zirconium metal–organic framework UiO-67 functionalized with platinum bipyridine coordination complexes (bpydcPtIICl2 and bpydcPtIVCl4) acting as linkers in MOF framework. These Pt can be reduced to bpydcPt0 under flow H2 gas 600–700 K range, probed by a sophisticated parametric refinement situ EXAFS data. IR spectroscopy testifies high coordinative unsaturation centers, able form bpydcPt0(CO)2 dicarbonyl upon CO adsorption. The large pore size...
During the last three decades low dimensional systems attracted increasing interest both from fundamental and technological point of view due to their unique physical chemical properties.X-ray Absorption Spectroscopy (XAS) is a powerful tool for characterization such kind systems, owing its selectivity high sensitivity in interatomic distances determination.Moreover this technique can simultaneously provide information on electronic local structural properties nanomaterials, significantly...
Understanding and tuning the catalytic properties of metals atomically dispersed on oxides are major stepping-stones toward a rational development single-atom catalysts (SACs). Beyond individual showcase studies, design synthesis structurally regular series SACs opens door to systematic experimental investigations performance as function metal identity. Herein, based various 4d (Ru, Rh, Pd) 5d (Ir, Pt) transition has been synthesized common MgO carrier. Complementary (X-ray absorption...
Abstract Realizing the full potential of oxide‐supported single‐atom metal catalysts (SACs) is key to successfully bridge gap between fields homogeneous and heterogeneous catalysis. Here we show that one‐pot combination Ru 1 /CeO 2 Rh SACs enables a highly selective olefin isomerization‐hydrosilylation tandem process, hitherto restricted molecular in solution. Individually, monoatomic sites remarkable reaction specificity for double‐bond migration anti ‐Markovnikov α‐olefin hydrosilylation,...
The European Synchrotron Radiation Facility has recently made available to the user community a facility totally dedicated Time-resolved and Extreme-conditions X-ray Absorption Spectroscopy – TEXAS. Based on an upgrade of former energy-dispersive XAS beamline ID24, it provides unique experimental tool combining unprecedented brilliance (up 10 14 photons s −1 4 µm × FWHM spot) detection speed for full EXAFS spectrum (100 ps per spectrum). science mission includes studies processes down...
A frontier challenge in single-atom (SA) catalysis is the design of fully inorganic sites capable emulating high reaction selectivity traditionally exclusive organometallic counterparts homogeneous catalysis. Modulating direct coordination environment SA sites, via exploitation oxide support's surface chemistry, stands as a powerful albeit underexplored strategy. We report that isolated Rh atoms stabilized on oxygen-defective SnO2 uniquely unite excellent TOF with essentially full gas-phase...
Recently, there has been a growing interest in using MOF templating to synthesize heterogeneous catalysts based on metal nanoparticles carbonaceous supports. Unlike the common approach of direct pyrolysis PdIn-MOFs at high temperatures, this work proposes reductive chemical treatment under mild conditions before (resulting PdIn-QT). The resulting material (PdIn-QT) underwent comprehensive characterization via state-of-the-art aberration-corrected electron microscopy, N2 physisorption, X-ray...
synchrotron radiation-based techniques are a precious tool in battery research, as they enable the detection of metastable intermediates and ensure characterization under realistic cycling conditions. However, do not come exempt risks. The interaction between radiation samples, particularly within an active electrochemical cell, can induce relevant effects at irradiated spot, potentially jeopardizing experiment's reliability biasing data interpretation. With aim contributing to this ongoing...
In this work we used several complementary techniques (TEM, TPR, CO chemisorption, EXAFS and FTIR spectroscopy) to understand the effects of activation temperature atmosphere (air or H2) on particle size distribution, fraction, type exposed surface sites Pd nanoparticles supported a high area SiO2−Al2O3 (SA) support. distribution has been carefully determined by statistic TEM study, from which cuboctahedral-like shape metal particles is demonstrated. Assuming model perfect cuboctahedral...
The effect of a graphitization treatment on the phyisico-chemical properties an activated carbon have been studied by means multi-technical approach. Inelastic neutron scattering and DRIFT spectroscopy revealed modifications occurring at material borders, involving H-containing species O-containing functional groups. Information structural were obtained Raman X-Ray Powder Diffraction.
Supported hydrodesulfidation (HDS) MoS2/SiO2, MoS2/γ-Al2O3 and MoS2/MgO catalysts having a model character have been synthesized by using CS2 as the sulfiding agent deeply investigated means of several techniques. XRPD, HRTEM, Raman UV-Vis methods applied to obtain information on morphology structure well vibrational spectroscopic properties. It is shown that, when compared with HRTEM results, data give realistic stacking degree, particle size distribution heterogeneity supported MoS2...
By applying N-doped carbon modified iron-based catalysts, the controlled hydrogenation of N-heteroarenes is achieved.