Arantxa Davó-Quiñonero

Arantxa Davó-Quiñonero
University of Alicante | UA · Inorganic Chemistry

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39
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Publications

Publications (39)
Article
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Fabrication of ultrathin films of dielectric (with particular reference to materials with high dielectric constants) materials has significance in many advanced technological applications including hard protective coatings, sensors, and next-generation logic devices. Current state-of-the-art in microelectronics for fabricating these thin films is a...
Article
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Residual biomass gasification is a promising route for the production of H2-rich syngas. However, the simultaneous formation of pollutants such as light hydrocarbons (HCs), benzene, toluene and xylenes (BTEX), polycyclic aromatic hydrocarbons (PAHs), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) during gasification must be controlle...
Article
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Rising global demand for biodegradable materials and green sources of energy has brought attention to lignin. Herein, we report a method for manufacturing standalone lignin membranes without additives for the first time to date. We demonstrate a scalable method for macroporous (∼100 to 200 nm pores) lignin membrane production using four different o...
Article
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The mechanism and kinetic of CO2 methanation reaction of 9.5 % Ni/Al2O3 catalyst is analysed under a wide range of operating conditions. Once the catalyst activity is stabilized, the influence of temperature, total pressure and space velocity is studied for kinetic characterisation. A data set comprising of 153 experimental runs has been used to de...
Article
A Ce0.5Pr0.5Ox soot combustion catalyst has been shaped combining this material prepared in two different structures (nanoparticles and MS-macroporous) in a single active phase. Nanoparticles, prepared by reversed microemulsion method, provide high activity to the hybrid material, and the MS structure, obtained by a hard template synthesis method,...
Article
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The preferential CO oxidation (so-called CO-PROX) is the selective CO oxidation amid H2-rich atmospheres, a process where ceria-based materials are consolidated catalysts. This article aims to disentangle the potential CO–H2 synergism under CO-PROX conditions on the low-index ceria surfaces (111), (110) and (100). Polycrystalline ceria, nanorods an...
Article
Sponge-like carbon monoliths with tailored channel architecture and porosity were prepared by combining sol-gel polymerization and 3D printing technology. The pore size distribution (PSD) and macropore volume were controlled by varying the water concentration used in the synthesis. The size and interconnection degree of primary particles, and conse...
Article
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This study addresses the yet unresolved CO2 methanation mechanism on a Ru/CeO2 catalyst by means of near-ambient-pressure X-ray photoelectron spectroscopy (NAP–XPS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) complemented with periodic density functional theory (DFT) calculations. NAP–XPS results show that the switch fr...
Article
The conversion of CO2 towards added valuable products is considered as a potential alternative to achieve the increase of the petrochemical industry while reducing the CO2 emissions. In the present work, the effect of Ru loading on CeO2 supports has been studied for the CO2 methanation reaction, and catalysts with different Ru loading in the 1–5 wt...
Article
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Honeycomb monoliths are the preferred supports in many industrial heterogeneous catalysis reactions, but current extrusion synthesis only allows obtaining parallel channels. Here, we demonstrate that 3D printing opens new design possibilities that outperform conventional catalysts. High performance carbon integral monoliths have been prepared with...
Article
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Cryptomelane is an abundant mineral manganese oxide with unique physicochemical features. This work investigates the real capabilities of cryptomelane as an oxidation catalyst. In particular, the preferential CO oxidation (CO-PROX), has been studied as a simple reaction model. When doped with copper, the cryptomelane-based material has revealed a g...
Article
PrOx nanoparticles (10nm; 81m²/g) were synthesized and analysed as soot combustion catalyst in comparation with other reference materials including CeO2 nanoparticles and PrOx and CeO2 catalysts with three dimensionally ordered (3DOM) and without controlled structure. PrOx nanoparticles reached the highest activity; T50 decreases from 603 °C (uncat...
Article
CO2 hydrogenation to CH4 (or methanation) has been proposed to diminish CO2 emissions producing a valuable fuel. A catalyst consisting of NiO-CeO2 mixed oxide 6–7 nm nanoparticles with enhanced properties has been prepared, and compared with other NiO-CeO2 reference catalysts including a mixed oxide with the same composition but without control of...
Article
Three-dimensional (3D)-printed catalysts are being increasingly studied; however, most of these studies focus on the obtention of catalytically active monoliths, and thus traditional channeled monolithic catalysts are usually obtained and tested, losing sight of the advantages that 3D-printing could entail. This work goes one step further, and an a...
Article
The individual and simultaneous removal of NOx by Storage and Reduction with H2 (H2‐NSR) and combustion of soot have been studied for La and CuLa catalysts. The NOx storage capacity of pure lanthanum oxide is improved either by copper addition or by using a colloidal crystal hard template for the synthesis of a macroporous structure. Although the N...
Article
The role of different active sites on Ni/CeO2 catalysts in the CO2 methanation has been studied. Two types of active sites have been identified: CO2 chemisorption and dissociation sites at the NiO-ceria interface and H2 dissociation sites on Ni⁰ entities. Additionally, the proportion of these active sites has been optimized to maximize the activity...
Article
The preferential CO oxidation (CO-PROX) reaction is paramount for the purification of reformate H2-rich streams, where CuO/CeO2 catalysts show promising opportunities. This work sheds light on the lattice oxygen recovery mechanism on CuO/CeO2 catalysts during CO-PROX reaction, which is critical to guarantee both good activity and selectivity, but t...
Article
The effect of the 3DOM structure and the Ni-doping of CeO2 on the physicochemical properties and catalytic activity for the soot combustion was studied. Moreover, the way in which Ni is introduced to the ceria support was also investigated. For that, CeO2 supports were synthesised with uncontrolled (Ref) and 3DOM structured morphology and their res...
Article
A new concept, referred to as key‐lock catalyst, is presented in this article. Soot combustion ceria catalysts were prepared combining hard (polymethylmethacrylate colloidal crystals) and soft (Pluronic F127) templates, tuning the porosity of ceria in different size ranges to match the morphology of soot aggregates. The catalysts porosity was chara...
Article
Full-text available
The CO2 methanation mechanism was studied for Ni/CeO2 and Ni/Al2O3 catalysts. The higher methanation activity and selectivity of Ni/CeO2 is attributed to: i) Ni/CeO2 combines two types of active sites efficient for CO2 dissociation at the NiO-Ceria interface and for H2 dissociation on Ni⁰ particles; ii) water desorption is the slowest mechanism ste...
Article
Nominally different Cu contents have been loaded on synthetic Cryptomelane oxide and the resulting CuO/Cryptomelane catalysts have been tested in the CO-PROX reaction. Catalytic activity was assessed in terms of the tunable synergistic interaction between copper and cryptomelane. This work entails the use of conventional characterization techniques...
Article
Honeycomb-shaped cordierite monoliths are widely used as supports for a great number of industrial applications. However, the high manufacturing costs of cordierite monoliths only justifies its use for high temperatures and aggressive chemical environments, demanding applications where the economic benefit obtained exceeds the manufacturing costs....
Article
A series of α-alumina supported cobalt spinel catalysts of various exposition of the (100), (111) and (110) planes was synthetized and tested in CO-PROX reaction. Successful control of the polyhedral shape of the nano-spinel active phase was achieved via glycerol and/or Zn additions to the impregnation solution. This allowed for the application of...
Article
The hydrogenation of CO2 into CH4 from H2 produced by renewable energy is considered an interesting alternative in order to promote the development of such green energies. In the present work, the effect of Ni and Ru loadings on the catalytic performance of alumina-supported catalysts is studied for CO2 methanation reaction. All catalysts were prep...
Article
An improved honeycomb-like monolith with asymmetrical channels, where the channels section decrease along the monolith, was fabricated using a template prepared by 3D printing. A reference honeycomb monolith was also prepared in the same way but with conventional straight channels. Cu/Ceria active phase was loaded on these supports, and SEM-EDX, Ra...
Article
PrOx and CuO/PrOx catalysts have been prepared with conventional (Ref) and three dimensionally order macroporous (3DOM) structures, and the effect of the structure on the soot combustion has been studied. It has been demonstrated that the 3DOM structure significantly improves the catalytic combustion of soot with O2. The activity follows the trend...
Article
The effect of the LnOx support has been studied for Ni‐based CO2 methanation catalysts. 10 wt. % nickel catalysts with LaOx, CeO2 and PrOx supports have been prepared, characterized by N2 adsorption, XRD, XRF, TG‐MS (N2‐TPD and H2‐TPR) and XPS, and have been tested for CO2 methanation. The catalytic activity follows the trend Ni/CeO2 > Ni/PrOx >> N...
Article
The synthesis and use for soot combustion of praseodymium oxide with three-dimensionally ordered macroporous (3DOM) structure is described. This novel PrOx-3DOM catalyst is presented as an improved novel metal-free alternative to CeO2 as soot combustion catalyst. The PrOx-3DOM catalyst presents a well-defined 3DOM structure with high macropores vol...
Article
CeO2 catalysts have been prepared with conventional (Ref) and three dimensionally order macroporous (3DOM) structures, and the effect of the structure on the soot combustion mechanism has been studied in detail. Isotopic exchange experiments showed that the CeO2-3DOM catalyst produces more active oxygen upon O2 chemisorption than the counterpart Ce...
Article
Full-text available
A Ce0.9Pr0.1O2 catalyst has been prepared using nitrates as metal precursors, which have been infiltrated into a polymethylmethacrylate colloidal crystal template and calcined at 500 °C. Its catalytic activity for CO oxidation (4.3 μmolCO s⁻¹ gcatalyst⁻¹ at 300 °C) is far superior compared to a reference catalyst prepared in the same way but withou...
Article
A novel concept is presented, consisting of a macroporous carrier-free catalyst. As a proof of concept, a novel Cu-containing Sr-Ti NSR catalyst with a macroporous network has been synthesized, and its maximum NOx storage capacity (1500 μmolNOx/gcatalyst) significantly surpasses that of conventional Pt/Ba/Al2O3 formulations (∼600–800 μmolNOx/gcatal...
Article
The catalytic activity of CuO/Cryptomelane for the preferential oxidation of CO in H2-rich streams has been studied in the absence and presence of H2O and CO2, paying special attention to the catalyst stability and to changes on its physical-chemical properties under CO-PROX reaction conditions. For fresh CuO/cryptomelane catalyst, the presence of...
Article
It is demonstrated that the synthesis procedure for preparing three-dimensionally ordered macroporous (3DOM) Pr-doped ceria catalysts using a polymethylmethacrylate (PMMA) template not only affects the porous structure, but also the chemistry of the ceria surface. The PMMA template does not affect the crystalline features (type of phases, crystalli...
Article
Novel methodology, referred to as rapid-scan operando, has been demonstrated to be a highly powerful tool for studying reaction mechanisms in heterogeneous catalysis, because it combines rapid scan for IR monitoring in the milliseconds time frame and operando methodology. As proof of concept, the NOx–CO and NOx–H2 reactions were studied as model ca...
Article
Full-text available
Cryptomelane and CuO/cryptomelane catalysts have been tested in the preferential oxidation of CO in the presence of H2 (CO-PROX reaction), paying special attention to deactivation and regeneration issues. Cryptomelane was stable during the CO-PROX reactions in ramp experiments until 200 °C and in a long-term isothermal experiment (10 h). Changes ne...
Article
Model CuO/Ce0.8X0.2O catalysts (with X = Ce, Zr, La, Pr or Nd) have been prepared in order to obtain CuO/ceria materials with different chemical features, and have been characterized by XRD, Raman spectroscopy, N2 adsorption and H2-TPR. CO-PROX experiments have been performed in a fixed-bed reactor and in an operando DRIFTS cell coupled to a mass...

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The preferential CO oxidation (CO-PROX) reaction is an efficient catalytic approach to tackle H2 purification for fuel cell uses. This Special Issue aims to cover outstanding recent research and novel trends in the design of active heterogeneous catalysis in the CO-PROX reaction. We invite researchers to contribute with research articles and review papers based on original experimental/theoretical findings that could stimulate the practicability of CO-PROX technology. More details at: https://www.mdpi.com/journal/catalysts/special_issues/COPROX_catals