{"id":18079,"date":"2002-04-07T00:00:00","date_gmt":"2002-04-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/sa%c2%adntesis-y-caracterizacion-estructural-y-microestructural-de-nitruros-y-oxinitruros-de-interes-tecnologico\/"},"modified":"2002-04-07T00:00:00","modified_gmt":"2002-04-07T00:00:00","slug":"sa%c2%adntesis-y-caracterizacion-estructural-y-microestructural-de-nitruros-y-oxinitruros-de-interes-tecnologico","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/sa%c2%adntesis-y-caracterizacion-estructural-y-microestructural-de-nitruros-y-oxinitruros-de-interes-tecnologico\/","title":{"rendered":"S\u00edntesis y caracterizaci\u00f3n estructural y microestructural de nitruros y oxinitruros de inter\u00e9s tecnol\u00f3gico"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Abdelouahad El Himri <\/strong><\/h2>\n<p>La investigaci\u00f3n en nitruros y carburos de metales de transici\u00f3n es un \u00e1rea emergente debido al n\u00famero cada vez mayor de aplicaciones que encuentran estos materiales. Los nitruros polimet\u00e1licos de molibdeno son, en este contexto, materiales catal\u00edticos prometedores, ya que han mostrado ser activos y selectivos en procesos de denitrogenaci\u00f3n y desulfuraci\u00f3n. Nuestro grupo ha desarrollado un m\u00e9todo de s\u00edntesis de estos compuestos basado en el uso de precursores polimet\u00e1licos obtenidos por liofilizaci\u00f3n.  nuestra primera tarea ha sido el estudio de la influencia de las condiciones de s\u00edntesis en la preparaci\u00f3n de nitruros monomet\u00e1licos de elementos de transici\u00f3n de los grupos 5 y 6 (v, cr, mo, w y nb). Despu\u00e9s se han preparado oxinitruros polimet\u00e1licos usando precursores obtenidos por liofilizaci\u00f3n de disoluciones acusosas de los metales en las proporciones estequiom\u00e9tricas adecuadas. La amonolisis de los precursores en la condiciones apropiadas nos ha permitido obtener los oxinitruros intersticales de vanadio-molibdeno, vanadio-cromo, cromo-molibdeno, vanadio-wolframio y molibdeno-wolframio, de estequiometr\u00edas a1-zbz(oxny), (0 &lt; z &lt; 1), as\u00ed como los compuestos polimet\u00e1licos de estequimoetr\u00eda v 1-u-zcruwz(oxny), v1-u-zmou wz(oxny) y cr1-u-zmou wz(oxny) (u, z = 0.2, 0.33, 0.4, 0.6; u + z &lt; 1), y v0.25cr0.25mo0.25w0.25(oxny). en todos los casos se obtienen fases \u00fanicas con estructura tipo sal com\u00fan.  en los sistemas bimet\u00e1licos se observa una variaci\u00f3n lineal de los par\u00e1metros de celda con la composici\u00f3n. La composici\u00f3n en metales es, dentro del error experimental, igual a la composici\u00f3n nominal de los precursores correspondientes. los granos de estos compuestos est\u00e1n constituidos por agregados de part\u00edculas esf\u00e9ricas nanom\u00e9tricas, de un di\u00e1metro t\u00edpico de unos 10-30 nan\u00f3metros. hemos preparado tambi\u00e9n los oxinitruros intersticiales de niobio y molibdeno, de estequiometr\u00eda nb1-zmoz(oxny) por amo<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>S\u00edntesis y caracterizaci\u00f3n estructural y microestructural de nitruros y oxinitruros de inter\u00e9s tecnol\u00f3gico<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 S\u00edntesis y caracterizaci\u00f3n estructural y microestructural de nitruros y oxinitruros de inter\u00e9s tecnol\u00f3gico <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Abdelouahad El Himri <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Universitat de val\u00e9ncia (estudi general)<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 04\/07\/2002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Fernando Sapi\u00f1a Navarro<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: daniel Beltran porter <\/li>\n<li>amparo Fuertes miquel (vocal)<\/li>\n<li>teofilo Rojo aparicio (vocal)<\/li>\n<li>roger Marchand (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Abdelouahad El Himri La investigaci\u00f3n en nitruros y carburos de metales de transici\u00f3n es un \u00e1rea emergente [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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