A5053343496- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Nanomaterials for catalytic reactions
- Electrocatalysts for Energy Conversion
- Metal-Organic Frameworks: Synthesis and Applications
- Mesoporous Materials and Catalysis
- Nanocluster Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Catalysts for Methane Reforming
- X-ray Diffraction in Crystallography
- Copper-based nanomaterials and applications
- Advanced Electron Microscopy Techniques and Applications
- Crystallization and Solubility Studies
- Asymmetric Hydrogenation and Catalysis
- Electron and X-Ray Spectroscopy Techniques
- Advanced Photocatalysis Techniques
- Electronic and Structural Properties of Oxides
- Machine Learning in Materials Science
- Zeolite Catalysis and Synthesis
- Catalysis for Biomass Conversion
- Advancements in Solid Oxide Fuel Cells
- Advanced Nanomaterials in Catalysis
- Supercapacitor Materials and Fabrication
- TiO2 Photocatalysis and Solar Cells
- Gold and Silver Nanoparticles Synthesis and Applications
Universidad de Cádiz
2015-2024
Hospital Universitario Puerto Real
2018-2023
Universidad Complutense de Madrid
2017
Universitat Politècnica de València
2009-2014
University of Cambridge
2007-2012
Philadelphia University
2012
CEA Grenoble
2009
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009
Institut Nanosciences et Cryogénie
2009
Industrial University of Santander
2009
There is a critical need for improved methane-oxidation catalysts to both reduce emissions of methane, greenhouse gas, and improve the performance gas turbines. However, materials that are currently available either have low activity below 400°C or unstable at higher temperatures. Here, we describe supramolecular approach in which single units composed palladium (Pd) core ceria (CeO(2)) shell preorganized solution then homogeneously deposited onto modified hydrophobic alumina. Electron...
Abstract The removal of acetylene from ethylene streams is key in industry for manufacturing polyethylene. Here we show that a well-defined Pd 1 –Au dimer, anchored to the walls metal–organic framework (MOF), catalyses selective semihydrogenation with ≥99.99% conversion (≤1 ppm acetylene) and >90% selectivity extremely rich (1% acetylene, 89% ethylene, 10% H 2 , simulated industrial front-end reaction conditions). proceeds an apparent activation energy ∼1 kcal mol –1 working even at 35...
The assumption that oxidative addition is the key step during cross-coupling reaction of aryl halides has led to development a plethora increasingly complex metal catalysts, thereby obviating in many cases exact influence base, which simple, inexpensive, and necessary reagent for this paramount transformation. Here, combined experimental computational study shows not single kinetically relevant different reactions catalyzed by sub-nanometer Pt or Pd species, since reactivity control shifted...
Abstract The gram‐scale synthesis, stabilization, and characterization of well‐defined ultrasmall subnanometric catalytic clusters on solids is a challenge. chemical synthesis X‐ray snapshots Pt 0 2 clusters, homogenously distributed densely packaged within the channels metal–organic framework, presented. This hybrid material catalyzes efficiently, even more importantly from an economic environmental viewpoint, at low temperature (25 to 140 °C), energetically costly industrial reactions in...
Metal single-atom catalysts (SACs) promise great rewards in terms of metal atom efficiency. However, the requirement particular conditions and supports for their synthesis, together with need solvents additives catalytic implementation, often precludes use under industrially viable conditions. Here, we show that palladium single atoms are spontaneously formed after dissolving tiny amounts salts neat benzyl alcohols, to catalyze direct aerobic oxidation benzoic acids without ligands,...
A lot of interesting and sophisticated examples nanoparticle (NP) self-assembly (SA) are known. From both fundamental technological standpoints, this field requires advancements in three principle directions: (a) understanding the mechanism driving forces three-dimensional (3D) SA with nano- microlevels organization; (b) disassembly/deconstruction processes; (c) finding synthetic methods assembly into continuous superstructures without insulating barriers. perspective, we investigated...
Nature uses enzymes to dissociate and transfer H2 by combining Fe2+ H+ acceptor/donor catalytic active sites. Following a biomimetic approach, it is reported here that very small planar Fe2,3+ oxide nanoparticles (2.0 ± 0.5 nm) supported on slightly acidic inorganic oxides (nanocrystalline TiO2, ZrO2, ZnO) act as bifunctional catalysts alkynes chemo- stereoselectively. This catalyst synthesized oxidative dispersion of Fe0 at the isoelectronic point support. The resulting Fe2+,3+ solid...
The de-novo synthesis of soluble or solid-supported Pd-(CaCO3)n clusters (n = 2–13) and their high catalytic activity for the semi-hydrogenation internal alkynes compared to terminal alkynes, is presented. Mechanistic studies show that this reactivity, i.e. more reactive than comes from higher electrophilicity cluster nanoparticulated Lindlar catalyst, which unveils advantages isolating minimum unit a solid catalyst. Translating active sites into catalysts turns around classical approach...
Abstract Living on the edge : Three‐dimensional reconstructions from electron tomography data recorded Au/Ce 0.50 Tb 0.12 Zr 0.38 O 2−x catalysts show that gold nanoparticles (see picture; yellow) are preferentially located stepped facets and nanocrystal boundaries. An epitaxial relationship between metal support plays a key role in structural stabilization of nanoparticles. magnified image
Electron tomography in high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) mode is used to image networks of nanoparticles within polymer-nanoparticle blend photovoltaic devices. Blends CdSe (∼6.5 nm diameter spheres and ∼33 long nanorods) with poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylene vinylene] (OC(1)C(10)-PPV) are investigated. using spherical particles found contain aggregated regions which well-connected exist, surrounded by lower-density...
The synthesis and reactivity of single metal atoms in a low-valence state bound to just water, rather than organic ligands or surfaces, is major experimental challenge. Herein, we show gram-scale wet Pt11+ stabilized confined space by crystallographically well-defined first water sphere, with second coordination sphere linked metal-organic framework (MOF) through electrostatic H-bonding interactions. role the cluster not only isolating stabilizing Pt atoms, but also regulating charge...
Stainless-steel honeycomb monoliths (square cell-shape/230 cpsi cylinders) were 3D-printed and used as support of a Ni/CeO2-ZrO2 powder deposited by washcoating. The resulting catalysts characterized XRF, SEM-EDX H2-TPR, tested in the dry reforming methane reaction. In 750–900 °C range, they showed competitive conversions (45–95%) H2/CO ratio (0.84–0.94) compared to cordierite honeycombs with same catalyst loading geometric characteristics, but did not require activation time thanks better...
The combination of well-defined Fe3+ isolated single-metal atoms and Ag2 subnanometer metal clusters within the channels a metal-organic framework (MOF) is reported characterized by single-crystal X-ray diffraction for first time. resulting hybrid material, with formula [Ag02(Ag0)1.34FeIII0.66]@NaI2{NiII4[CuII2(Me3mpba)2]3}·63H2O (Fe3+Ag02@MOF), capable catalyzing unprecedented direct conversion styrene to phenylacetylene in one pot. In particular, Fe3+Ag02@MOF─which can easily be obtained...
The several factors that render certain kinds of nanoporous oxidic solids valuable for the design a wide range new heterogeneous catalysts are outlined and exemplified. These include: (i), their relative ease preparation, when both mesoporous siliceous frameworks (ca. 20 to 250 Å diameter pores) microporous framework-substituted aluminophosphates 4 14 can be tailored suit particular catalytic needs according whether regiospecific or enantio- shape-selective conversions goal; (ii), enormous...
The realization of materials at the nanometer scale creates new challenges for quantitative characterization and modeling as many physical chemical properties nanoscale are highly size shape-dependent. In particular, accurate nanometrological noble metal nanoparticles (NPs) is crucial understanding their optical response that determined by collective excitation conduction electrons, known localized surface plasmons. Its manipulation gives place to a variety applications in ultrasensitive...
Abstract Sub‐nanometer metal clusters have special physical and chemical properties, significantly different from those of nanoparticles. However, there is a major concern about their thermal stability susceptibility to oxidation. In situ X‐ray Absorption spectroscopy Near Ambient Pressure Photoelectron results reveal that supported Cu 5 are resistant irreversible oxidation at least up 773 K, even in the presence 0.15 mbar oxygen. These experimental findings can be formally described by...