Q3166796 (Q3166796): Difference between revisions
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Project | Project Q3166796 in Spain | ||
Revision as of 08:17, 8 October 2021
Project Q3166796 in Spain
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | No label defined |
Project Q3166796 in Spain |
Statements
193,600.0 Euro
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242,000.0 Euro
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80.0 percent
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1 January 2018
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31 December 2020
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UNIVERSIDAD DE CADIZ
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11012
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ESTA PROPUESTA TIENE COMO EJE CENTRAL LA PREPARACION DE NANOCATALIZADORES POR CRECIMIENTO EPITAXIAL DE CAPAS DE ESPESOR ATOMICO SOBRE SUPERFICIES CRISTALOGRAFICAMENTE BIEN DEFINIDAS DE NANO-OXIDOS CON MORFOLOGIA CONTROLADA. _x000D_ USANDO METODOS QUIMICOS POR VIA HUMEDA SE PREPARARAN SISTEMAS MULTICOMPONENTE OXIDO/OXIDO Y METAL/OXIDO/OXIDO CON PRESTACIONES MEJORADAS EN CATALISIS MEDIOAMBIENTAL._x000D_ SE ESPERA CONTRIBUIR AL RETO DE ¿EFICIENCIA EN LA UTILIZACION DE RECURSOS Y MATERIAS PRIMAS", EN CONCRETO DE TIERRAS RARAS LIGERAS (CE) Y PESADAS (TB), ASI COMO DE METALES NOBLES (AU) Y DEL GRUPO DEL PLATINO (PD). _x000D_ LAS ESTRATEGIAS PARA IMPACTAR EN ESTE RETO SON: (1) DISMINUCION DE LAS CARGAS MOLARES DE LOS LANTANIDOS EN LAS NUEVAS FORMULACIONES; (2) MEJORAS EN LA ACTIVIDAD Y ESTABILIDAD DE LOS CATALIZADORES; (3) REDUCCION DE PERDIDAS DE METALES NOBLES EN LOS PROCESOS DE PREPARACION. LAS DOS PRIMERAS SUPONEN ¿HACER MAS CON MENOS¿; LA TERCERA, AUMENTAR LA EFICIENCIA ATOMICA DURANTE LA SINTESIS Y EL CICLO DE VIDA DE LAS MATERIAS PRIMAS. _x000D_ SE DEPOSITARAN CAPAS EPITAXIALES ULTRAFINAS DE OXIDOS DE CERIO SOBRE NANOCRISTALES DE ZRO2, TIO2 Y MGO CON MORFOLOGIAS BIEN DEFINIDAS, PREPARADOS POR VIA HIDROTERMAL. CON MODIFICACIONES ADECUADAS SE AMPLIARA EL ABANICO A SUSTRATOS TIPO OXIDO MIXTO. ESTA APROXIMACION SINTETICA REDUCIRA EL CONTENIDO EN CE AL INCORPORADO EN LA CAPA EPITAXIAL; PEQUEÑO EN COMPARACION CON EL DEL CEO2 MASIVO._x000D_ LA MODIFICACION DEL CEO2 CON LANTANIDOS PESADOS, COMO TB, O METALES 3D (FE, NI) DA LUGAR A MATERIALES CON PROPIEDADES REDOX Y CATALITICAS MEJORADAS RESPECTO DE LAS DEL CEO2. SIN EMBARGO, EL TB SE CUENTA ENTRE LAS MATERIAS PRIMAS DE MAYOR CARACTER CRITICO. PARA MODERAR SU USO, SE PROPONE CRECER CAPAS EPITAXIALES DE ESPESOR ATOMICO DE OXIDOS MIXTOS CE/TB SOBRE NANOESTRUCTURAS BASADAS EN CEO2. EN CONCRETO, SE ENSAYARAN NANOCUBOS, NANO-OCTAHEDROS Y NANOVARILLAS PARA CRECER CAPAS SOBRE SUPERFICIES {100}, {110} Y {111}. LA SIMILITUD ESTRUCTURAL CON EL SUSTRATO HACE PENSAR EN EL CRECIMIENTO DE CAPAS MUY HOMOGENEAS CONTENIENDO AL LANTANIDO PESADO O A MEZCLAS CE-LN, CE-M(3D). SE PUEDE MODIFICAR EL ESTADO DE TENSION Y LAS PROPIEDADES DE DICHAS CAPAS CRECIENDOLAS SOBRE OXIDOS MIXTOS CEMO2-X (M=LA3+, PR3+, ZR4+). _x000D_ LA ESTABILIZACION DE AU Y PD (MN) SOPORTADOS SOBRE CUALQUIERA DE LOS NANO-OXIDOS MENCIONADOS (ZRO2, TIO2, MGO O CEO2) SE CONSEGUIRIA MEDIANTE LA DEPOSICION DE CAPAS ULTRAFINAS DE CEO2 O CEMO2-X (M=LN, 3D) SOBRE CATALIZADORES MN/SOPORTE PREVIAMENTE PREPARADOS. SE ESPERA QUE LAS INTERACCIONES MN-CAPA ULTRAFINA DE CEMO2-X PERMITIRA AUMENTAR SIGNIFICATIVAMENTE LA RESITENCIA A LA SINTERIZACION DE LA FASE METALICA, QUE REPRESENTA UNA DE LAS PRINCIPALES CONTRIBUCIONES A LA DESACTIVACION DE CATALIZADORES DE MN SOPORTADOS. TAMBIEN SU ACTIVIDAD INTRINSECA._x000D_ LA PROPUESTA IMPACTA TAMBIEN SOBRE OTROS RETOS EN EL AMBITO DEL MEDIO AMBIENTE Y EN EL DESARROLLO DE TECNOLOGIAS FACILITADORAS, COMO SON LAS NANOTECNOLOGIAS. EN RELACION CON ESTO CONSIDERESE: (1) EL ALTO IMPACTO AMBIENTAL DE LA MINERIA Y EL PROCESADO DE LANTANIDOS; (2) EL USO INTENSIVO DE LANTANIDOS EN TECNOLOGIAS CATALITICAS PARA EL CONTROL DE LA POLUCION AMBIENTAL; (3) LA OPTIMIZACION DE TECNICAS QUIMICAS DE AMPLIA DISPONIBILIDAD PARA LA PREPARACION DE NANOESTRUCTURAS 2D DE ESPESOR SUBNANOMETRICO; (4) EL DESARROLLO DE NUEVAS METODOLOGIAS DE MICROSCOPIA ELECTRONICA TEM/STEM AVANZADAS PARA LA CARACTERIZACION DE SUPERFICIES E INTERFASES DE MATERIALES BIDIMENSIONALES DE ESPESOR SUBNANOMETRICO. (Spanish)
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WE PROPOSE EXPLORING THE GROWTH OF ATOMICALLY-THIN EPITAXIAL (ATE) LAYERS OF LANTHANIDE-CONTAINING OXIDES ON THE CRYSTALLOGRAPHICALLY WELL-DEFINED SURFACES OF SHAPED NANO-OXIDE SUSBSTRATES._x000D_ USING FACILE WET CHEMISTRY ROUTES, OXIDE/OXIDE AND NOBLE METAL/OXIDE/OXIDE MULTICOMPONENT NANOCATALYSTS WILL BE PREPARED AND TESTED IN ENVIRONMENTAL PROTECTION RELATED PROCESSES._x000D_ IMPACT IS EXPECTED ON THE SOCIETAL CHALLENGE ¿TOWARDS A MORE EFFICIENT USAGE OF RESOURCES AND RAW MATERIALS¿. THE PROJECT WILL PARTICULARLY FOCUS ON LIGHT (CE) AND HEAVY RARE EARTHS (TB) AS WELL AS ON NOBLE METALS, AU AND PD, THE LATTER FROM THE PLATINUM GROUP. _x000D_ STRATEGIES TO REACH THIS IMPACT INCLUDE: (1) DECREASING MOLAR LOADINGS OF THE LANTHANIDES IN THE NEW FORMULATIONS; (2) IMPROVING ACTIVITY AND ESTABILITY OF THE NEW NANOCATALYSTS; (3) MINIMIZING LOSSES OF METAL PRECURSORS DURING THE SYNTHESIS OF SUPPORTED CATALYSTS. THE FORMER TWO TRANSLATE AS ¿DOING MORE WITH LESS¿, WHEREAS THE LATTER INVOLVE INCREASING ATOMIC EFFICIENCY DURING SYNTHESIS AS WELL AS EXPANDING THE END-OF-LIFE CYCLE OF THE ABOVE MENTIONED RAW MATERIALS._x000D_ ATOMICALLY-THIN, EPITAXIAL, CERIA LAYERS (ATEL) WILL BE DEPOSITED ON THE SURFACE OF SHAPE-CONTROLLED ZRO2, TIO2 AND MGO NANOCRYSTALS PREPARED BY HYDROTHERMAL METHODS. BY ADEQUATE MODIFICATIONS MIXED OXIDES WILL BE ALSO USED. THIS APPROACH ALLOWS LIMITING THE AMOUNT OF CERIA TO THAT INCORPORATED INTO THE ULTRATHIN SURFACE LAYER, IN GENERAL MUCH LOWER THAN THAT INVOLVED IN CONVENTIONAL, BULK, CERIA POWDERS. _x000D_ INCORPORATION OF A HEAVY LANTHANIDE AS TB OR 3D METALS, AS FE OR NI, INTO CERIA BRINGS LARGE IMPROVEMENTS BOTH IN REDOX AND CATALYTIC PERFORMANCE WITH RESPECT TO THE PURE OXIDE. HOWEVER, TB IS CURRENTLY INCLUDED AMONG THOSE HIGHLY CRITICAL. GROWING THESE CE-TB MIXED OXIDE PHASES AS ATOMICALLY-THIN EPITAXIAL LAYERS, ONTO CERIA-BASED NANOPARTICLES, IS PROPOSED AS AN STRATEGY TO IMPLEMENT IT WITHIN A LIMITED USAGE CONSTRAIN. NANOCUBES, NANO-OCTAHEDRA AND NANORODS WILL BE USED TO GROW EPITAXIAL LAYERS ONTO {100}, {110} AND {111} TYPE SURFACES. THE SIMILARITY BETWEEN THE STRUCTURE OF THE CORRESPONDING DIOXIDES ANTICIPATES THE GROWTH OF HIGHLY HOMOGENEOUS EPITAXIAL LAYERS, WHICH INCLUDE THE HEAVY LANTHANIDE. MOREOVER, INCORPORATING A SECOND ELEMENT IN THE CERIA SUBSTRATE, CEMO2-X (M=LA3+, Y3+, ZR4+), OPENS THE POSSIBILITY TO MODULATE THE STRAIN STATE OF THE EPITAXIAL LAYERS AND, HENCE, THEIR PROPERTIES._x000D_ WE ALSO PROPOSE EXPLORING THE ROLE OF ATELS TO PROMOTE ACTIVITY AND STABILITY OF AU AND PD SUPPORTED ON THE ABOVE MENTIONED SHAPE-CONTROLLED NANO-OXIDE SUPPORTS. THESE LAYERS WOULD BE ADDED ONTO PREVIOUSLY PREPARED NM/SUPPORT CATALYSTS. WE HYPOTHESIZE IN THIS CASE WITH A POSITIVE INFLUENCE OF THE NM-LAYER INTERACTIONS BOTH ON IMPROVING THEIR INTRINSIC ACTIVITY AND ON LIMITING METAL NANOPARTICLE SINTERING, WIDELY RECOGNISED AS A MAJOR CONTRIBUTION TO THEIR DEACTIVATION._x000D_ AN IMPACT ON OTHER SOCIETAL CHALLENGES RELATED TO ENVIRONMENTAL PROTECTION AS WELL AS ON FOSTERING THE DEVELOPMENT OF NANOTECHNOLOGY IS EXPECTED. RELATED TO THIS, IT BECOMES MEANINGFUL CONSIDERING: (1) THE VERY LARGE ENVIRONMENTAL IMPACT OF REES MINING AND PROCESSING; (2) THE INTENSIVE USE OF LANTHANIDES IN CATALYTIC TECHNOLOGIES; (3) MAKING AVAILABLE OPTIMIZED ROUTES FOR A FACILE, REPRODUCIBLE, SYNTHESIS OF ATOMICALLY THIN SUPPORTED 2D PHASES; (4) DEVELOPMENT OF SPECIFIC METHODOLOGIES FOR THE TEM/STEM CHARACTERIZATION OF SURFACES AND INTERFACES INVOLVING SUBNANOMETER-THICK 2D PHASES. (English)
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Cádiz
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Identifiers
MAT2017-87579-R
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