Wyniki wyszukiwania dla: D. Cazorla-Amorós

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Facile encapsulation of P25 (TiO2) in spherical silica with hierarchical porosity with enhanced photocatalytic properties for gas-phase propene oxidation

J. Fernández-Catalá, D. Cazorla-Amorós, Á. Berenguer-Murcia

Applied Catalysis A: General > 2018 > 564 > C > 123-132

In this work, we have performed the encapsulation of a reference TiO₂ material (P25) in spherical silica with hierarchical porosity using a sol-gel methodology. The same P25 material has been encapsulated within a “classical” MCM-41 mesoporous silica and a precipitated silica. The materials synthesized in this work were characterized by ICP-OES, SEM, TEM, EDX, XRD, UV–VIS, TG, and nitrogen adsorption...

artykuł

Ferrosilicate-Based Heterogeneous Fenton Catalysts: Influence of Crystallinity, Porosity, and Iron Speciation

E. V. Parkhomchuk, J. García-Aguilar, K. A. Sashkina, A. Berenguer-Murcia, więcej

Catalysis Letters > 2018 > 148 > 10 > 3134-3146

Different ferrosilicate samples have been prepared with varying degrees of crystallinity, porous texture, and speciation of the Fe sites by both hydrothermal and sol–gel procedures: Fe-silicalite-1 with microcrystals (2–10 µm) and nanocrystals (180 nm), Fe-containing composite material consisting of silicalite-1 and amorphous silica, and two samples of mesoporous Fe-containing amorphous silica Fe–SiO...

artykuł

Lignin-derived Pt supported carbon (submicron)fiber electrocatalysts for alcohol electro-oxidation

F.J. García-Mateos, T. Cordero-Lanzac, R. Berenguer, E. Morallón, więcej

Applied Catalysis B: Environmental > 2017 > 211 > C > 18-30

Lignin fibers, with and without phosphorus, and loaded with platinum have been prepared in a single step by electrospinning of lignin/ethanol/phosphoric acid/platinum acetylacetonate precursor solutions. Thermochemical treatments have been carried out to obtain lignin-based carbon fiber electrocatalysts. The electrospun lignin fibers were thermostabilized in air and carbonized at 900°C. The effect...

artykuł

Efficient Pt electrocatalysts supported onto flavin mononucleotide–exfoliated pristine graphene for the methanol oxidation reaction

M. Ayán-Varela, R. Ruiz-Rosas, S. Villar-Rodil, J.I. Paredes, więcej

Electrochimica Acta > 2017 > 231 > C > 386-395

Due to its large surface area, high electrical conductivity as well as mechanical and thermal stability, pristine graphene has the potential to be an excellent support for metal nanoparticles (NPs), but the scarce amount of intrinsic chemical groups/defects in its structure that could act as anchoring sites for the NPs hinders this type of use. Here, a simple strategy based on the stabilization of...

artykuł

One step-synthesis of highly dispersed iron species into silica for propylene epoxidation with dioxygen

J. García-Aguilar, I. Miguel-García, J. Juan-Juan, I. Such-Basáñez, więcej

Journal of Catalysis > 2016 > 338 > C > 154-167

Well dispersed iron catalysts were synthesized in silica (Fe_0.0_XSiO₂) by a one-step synthesis procedure. These materials were tested in the propylene epoxidation reaction with gaseous O₂. The influence of the iron metal loading on the iron incorporation and distribution in the support (both influenced by the synthetic procedure) were thoroughly studied (conversion, generation and selectivity). Electron...

rozdział

Hydrogen Adsorption on Carbon Materials at High Pressures and Different Temperatures

F. Suárez-García, M. Jordá-Beneyto, D. Lozano-Castelló, D. Cazorla-Amorós, więcej

NATO Science for Peace and Security Series C: Environmental Security > Recent Advances in Adsorption Processes for Environmental Protection and Security > 165-175

In this work, we present experimental results corresponding to H₂ adsorption at high pressures and different temperatures (77 and 298 K) for a wide variety of carbons materials in order to analyze the effect of the porosity on the H₂ adsorption capacities in gravimetric basis. Likewise, we point out the importance of the packing density of the materials in order to obtain high H₂ adsorption capacities...

rozdział

Controlling Porosity to Improve Activated Carbon Applications

Angel Linares-Solano, D. Lozano-Castelló, M. A. Lillo-Ródenas, D. Cazorla-Amorós

NATO Science for Peace and Security Series C: Environmental Security > Recent Advances in Adsorption Processes for Environmental Protection and Security > 97-106

This chapter presents an overview of preparation and characterization of activated carbons (ACs), activated carbon fibres (ACFs) and activated carbon monoliths (ACMs) to be used in different applications. Examples of the performance of these materials in environmental, energy storage and space applications are presented, remarking the importance of carrying out a suitable porous texture characterization...

rozdział

Application of Non-crystalline Diffraction with Microfocus to Carbon Fibres

D. Cazorla-Amorós, D. Lozano-Castelló, M. Müller

Lecture Notes in Physics > Applications of Synchrotron Light to Scattering and Diffraction in Materials and Life Sciences > 199-216

An overview of the type of information obtained by X-ray microdiffraction and micro small-angle X-ray scattering ( $$\mu$$ SAXS) measurements on carbon fibres and activated carbon fibres is presented. It is shown that the use of X-ray microbeams is a unique way to know about the internal organisation of both pores and nanocrystallites in single carbon fibres. Moreover, combination of these techniques...

artykuł

Enhanced electro-oxidation resistance of carbon electrodes induced by phosphorus surface groups

R. Berenguer, R. Ruiz-Rosas, A. Gallardo, D. Cazorla-Amorós, więcej

Carbon > 2015 > 95 > C > 681-689

The electro-oxidation of carbon materials enormously degrades their performance and limits their wider utilization in multiple electrochemical applications. In this work, the positive influence of phosphorus functionalities on the overall electrochemical stability of carbon materials has been demonstrated under different conditions. We show that the extent and selectivity of electroxidation in P-containing...

artykuł

Characterization of a zeolite-templated carbon by electrochemical quartz crystal microbalance and in situ Raman spectroscopy

S. Leyva-García, K. Nueangnoraj, D. Lozano-Castelló, H. Nishihara, więcej

Carbon > 2015 > 89 > C > 63-73

Electrochemical quartz crystal microbalance was used to monitor the mass changes during the electrochemical characterization of a zeolite-templated carbon (ZTC) in 1M H₂SO₄ medium. Under electrochemical oxidation conditions, a high anodic current and a net mass increase were recorded, resulting in the increase of the specific capacitance owing to the contribution of the pseudocapacitance, mainly derived...

artykuł

Optimizing the performance of catalytic traps for hydrocarbon abatement during the cold-start of a gasoline engine

B. Puértolas, M. Navlani-García, T. García, M.V. Navarro, więcej

Journal of Hazardous Materials > 2014 > 279 > Complete > 527-536

A key target to reduce current hydrocarbon emissions from vehicular exhaust is to improve their abatement under cold-start conditions. Herein, we demonstrate the potential of factorial analysis to design a highly efficient catalytic trap. The impact of the synthesis conditions on the preparation of copper-loaded ZSM-5 is clearly revealed by XRD, N ₂ sorption, FTIR, NH ₃ -TPD, SEM and...

artykuł

New insights on electrochemical hydrogen storage in nanoporous carbons by in situ Raman spectroscopy

S. Leyva-García, E. Morallón, D. Cazorla-Amorós, F. Béguin, więcej

Carbon > 2014 > 69 > Complete > 401-408

In situ Raman spectroscopy was exploited to analyze the interaction between carbon and hydrogen during electrochemical hydrogen storage at cathodic conditions. Two different activated carbons were used and characterized by different electrochemical techniques in two electrolytes (6MKOH and 0.5MNa ₂ SO ₄ ). The in situ Raman spectra collected showed that, in addition to the D and G...

artykuł

Tailoring the porosity of chemically activated hydrothermal carbons: Influence of the precursor and hydrothermal carbonization temperature

C. Falco, J.P. Marco-Lozar, D. Salinas-Torres, E. Morallón, więcej

Carbon > 2013 > 62 > Complete > 346-355

Advanced porous materials with tailored porosity (extremely high development of microporosity together with a narrow micropore size distribution (MPSD)) are required in energy and environmental related applications. Lignocellulosic biomass derived HTC carbons are good precursors for the synthesis of activated carbons (ACs) via KOH chemical activation. However, more research is needed in order to tailor...

artykuł

Flexible ruthenium oxide-activated carbon cloth composites prepared by simple electrodeposition methods

J.M. Sieben, E. Morallón, D. Cazorla-Amorós

Energy > 2013 > 58 > Complete > 519-526

This work focuses on the preparation of flexible ruthenium oxide containing activated carbon cloth by electrodeposition. Different electrodeposition methods have been used, including chronoamperometry, chronopotentiometry and cyclic voltammetry. The electrochemical properties of the obtained materials have been measured. The results show that the potentiostatic method allows preparing composites with...

artykuł

Relevance of porosity and surface chemistry of superactivated carbons in capacitors

D. Lozano-Castelló, J.P. Marco-Lozar, M.J. Bleda-Martı́nez, F. Montilla, więcej

Carbon > 2013 > 57 > Complete > 539

artykuł

Electrochemical generation of oxygen-containing groups in an ordered microporous zeolite-templated carbon

R. Berenguer, H. Nishihara, H. Itoi, T. Ishii, więcej

Carbon > 2013 > 54 > Complete > 94-104

Zeolite templated carbon (ZTC) was electrochemically oxidized under various conditions, and its chemistry and structural evolution were compared to those produced by conventional chemical oxidation. In both oxidation methods, a general loss of the original structure regularity and high surface area was observed with increasing amount of oxidation. However, the electrochemical method showed much better...

artykuł

Asymmetric hybrid capacitors based on activated carbon and activated carbon fibre–PANI electrodes

D. Salinas-Torres, J.M. Sieben, D. Lozano-Castelló, D. Cazorla-Amorós, więcej

Electrochimica Acta > 2013 > 89 > Complete > 326-333

Composites consisting of polyaniline (PANI) coatings inside the microporosity of an activated carbon fibre (ACF) were prepared by electrochemical and chemical methods. Electrochemical characterization of both composites points out that the electrodes with polyaniline show a higher capacitance than the pristine porous carbon electrode. These materials have been used to develop an asymmetric capacitor...

artykuł

Abatement of hydrocarbons by acid ZSM-5 and BETA zeolites under cold-start conditions

B. Puértolas, J. M. López, M. V. Navarro, T. García, więcej

Adsorption > 2013 > 19 > 2-4 > 357-365

Simulated cold-start tests have been carried out to evaluate the performance of H-ZSM-5 and H-BETA zeolites as hydrocarbon traps under simulated gasoline car exhaust gases, paying special attention to the effect of water on their behaviour. It is concluded that the hydrothermal treatment of the zeolites in the acidic form contributes to the better performance of these materials as hydrocarbon traps...

artykuł

Investigating the influence of surfactants on the stabilization of aqueous reduced graphene oxide dispersions and the characteristics of their composite films

M.J. Fernández-Merino, J.I. Paredes, S. Villar-Rodil, L. Guardia, więcej

Carbon > 2012 > 50 > 9 > 3184-3194

The stabilization of reduced graphene oxide (RGO) sheets in aqueous dispersion using a wide range of surfactants of anionic, non-ionic and zwitterionic type has been investigated and compared under different conditions of pH, surfactant and RGO concentration, or sheet size. The observed differences in the performance of the surfactants were rationalized on the basis of their chemical structure (e...

artykuł

Effect of the aging time of PVP coated palladium nanoparticles colloidal suspensions on their catalytic activity in the preferential oxidation of CO

I. Miguel-García, Á. Berenguer-Murcia, T. García, D. Cazorla-Amorós

Catalysis Today > 2012 > 187 > 1 > 2-9

Palladium nanoparticles protected by polyvinylpyrrolidone (PVP) have been synthesized by the reduction-by-solvent method and deposited onto alumina by the wet impregnation method. The metallic colloid has been left for different times (aging times) at room temperature and under open bench conditions before deposition of the particles on the support. The colloids have been analyzed by TEM, and the...

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