A5058259914- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Nanomaterials for catalytic reactions
- Advanced Photocatalysis Techniques
- Gas Sensing Nanomaterials and Sensors
- Advanced Nanomaterials in Catalysis
- Electrocatalysts for Energy Conversion
- Mesoporous Materials and Catalysis
- Transition Metal Oxide Nanomaterials
- Water Quality Monitoring and Analysis
- Catalysis and Hydrodesulfurization Studies
- Carbon dioxide utilization in catalysis
- Advancements in Battery Materials
- Chemical Looping and Thermochemical Processes
- TiO2 Photocatalysis and Solar Cells
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Copper-based nanomaterials and applications
- Carbon Nanotubes in Composites
- Metal complexes synthesis and properties
- Electrochemical Analysis and Applications
- Luminescence Properties of Advanced Materials
- Pigment Synthesis and Properties
Universidad de Salamanca
2021-2024
Universidad de Cádiz
2018-2021
Universidad de Extremadura
2014-2016
The behavior of activated carbon in many catalysis processes is determined by the basic character its surface. Using FT-IR spectroscopy, an attempt made here to identify not only pyrone and chromene type structures but also their isomers a commercial (Merck; AC). infrared analysis between 400 4000 cm–1 focuses on keto (−C═O) group pyrones, methylene (−CH2−) chromenes, enol ether (O–C═C) both kinds structures. Although overlapping bands are frequent AC spectrum, occurrence most significant...
From a granular commercial activated carbon (AC) and six metal oxide (Al2O3, Fe2O3, SnO2, TiO2, WO3 ZnO) precursors, two series of AC-metal nanocomposites were prepared by wet impregnation, oven-drying at 120 °C, subsequent heat treatment 200 or 850 °C in an inert atmosphere. Here, the electrical conductivity resulting products was studied under moderate compression. The influence applied pressure, sample volume, mechanical work, density hybrid materials thoroughly investigated. DC...
Because of the relevance in heterogeneous catalysis, changes produced surface chemistry activated carbon (AC) upon impregnation with Al3+, Fe3+ and Zn2+ ions from aqueous solution NO3− salts at pH 2.91 for 1.54 5.16 two successive soaking oven-drying steps are studied. The samples (A120, F120 Z120) were analyzed terms elemental composition by energy dispersive X-ray analysis (EDX), FT-IR spectroscopy, photoelectron spectroscopy (XPS), measurement point zero charge (pHpzc). process yield was...
The chemical changes produced in the surface of activated carbon as a result process preparation carbon–metal oxide catalysts from SnCl2, TiO2, and Na2WO4 water at pH 1.37 for 5.84 9.54 are studied. samples were first prepared by wet impregnation method two successive steps soaking 80 °C 5 h oven-drying 120 24 h. Then, they analyzed elemental analysis, FT-IR spectroscopy, measurement point zero charge (pHpzc). yield was 149 wt % with 103 106 Na2WO4. catalyst precursors entails oxidation...
Despite the increasing economic incentives and environmental advantages associated to their substitution, carbon-rich fossil fuels are expected remain as dominant worldwide source of energy through at least next two decades perhaps later. Therefore, both control reduction CO2 emissions have become issues major concern big challenges for international scientific community. Among proposed strategies achieve these goals, conversion by its into high added value products, such methane or syngas,...
A novel facile method to prepare ceria nanocrystals with well-defined cubic morphology and enhanced optical properties is herein disclosed. Both the decrease in band gap appearance of absorption edges above 400 nm, which redound a significant visible light, are accomplished by simply incorporating situ different amounts typical chelating bidentate ligand, 1,10-phenanthroline, during synthesis these nanocubes. Such remarkable effect has been tentatively connected ability this...
Ceria‐zirconia mixed oxides are widely used as catalysts and catalytic supports. Nevertheless, due to economic geo‐strategic concerns, reducing optimizing the lanthanide content in these formulations while preserving or even improving their excellent redox properties has become a challenge for current research. In this context, design of core@shell nanostructures arises feasible alternative achieve aforesaid goal. present work, new nanostructured ZrO 2 @CeO system based on spherical...
Summary In catalysis processes, activated carbon (AC) and metal oxides (MOs) are widely used either as catalysts or catalyst supports because of their unique properties. A combination AC a MO in single hybrid material entails changes not only the composition, microstructure texture but also morphology, which may largely influence catalytic behaviour resulting product. This work is aimed at investigating modifications morphology particle size distribution (PSD) for AC‐MO result preparation...
The introduction of iron ionic sites by metal exchange defective homometallic nickel pyrazolate frameworks generates non-precious, Earth-abundant, first-row heterometallic Fe/Ni-pyrazolate frameworks. Fe incorporation at the Ni nodes framework allows to control hydrogen peroxide activation, minimizing its decomposition and O2 liberation, occurring nodes. generation Fe-OH reactive oxygen species Fe/Ni is demonstrated higher activity in proof-of-concept oxidation 1-phenylethanol acetophenone...
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Morphological features of metal (hydr)oxide (MO) particles supported on activated carbon (AC) largely influence the performance these composite materials in most their applications, particularly heterogeneous catalysis. Furthermore, MO precursor as well preparation method and conditions strongly determine morphological features. Thus, present work is aimed at shedding light role chemistry surface morphology a series AC-MO composites prepared by wet impregnation commercial AC with Al(NO3)3,...
Three nanostructured catalysts with low total rare earth elements (REEs) content (i.e., 15 mol.%) were prepared by depositing CeO2 or Ln3+-doped (Ln3+ = Y3+ La3+; Ln/Ce 0.15) on the surface of ZrO2 nanoparticles, as nanometre-thick, fluorite-type clusters. These samples subjected to successive reduction treatments at increasing temperatures, from 500 900 °C. A characterisation study XPS was performed clarify diffusion process cerium into bulk crystallites upon yield CexZr1−xO2−δ phases, and...