{"id":26243,"date":"2003-10-10T00:00:00","date_gmt":"2003-10-10T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/eliminacion-de-la-acidez-superficial-externa-en-zeolitas-tipo-zsm\/"},"modified":"2003-10-10T00:00:00","modified_gmt":"2003-10-10T00:00:00","slug":"eliminacion-de-la-acidez-superficial-externa-en-zeolitas-tipo-zsm","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/eliminacion-de-la-acidez-superficial-externa-en-zeolitas-tipo-zsm\/","title":{"rendered":"Eliminaci\u00f3n de la acidez superficial externa en zeolitas tipo zsm"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Ruiz Fern\u00e1ndez Jos\u00e9 Antonio <\/strong><\/h2>\n<p>La estructura cristalina de las zeolitas presenta una serie de canales y\/o cavidades en su interior, variables en tama\u00f1o en funci\u00f3n del tipo de zeolita de que se trate, que permiten orientar las reacciones hacia la formaci\u00f3n de determinados productos en funci\u00f3n simplemente del tama\u00f1o de las mol\u00e9culas (selectividad de forma). Este fen\u00f3meno tiene especial relevancia en procesos en los que las reacciones secundarias son m\u00e1s r\u00e1pidas que la reacci\u00f3n principal, y dan lugar a subproductos de elevado tama\u00f1o molecular. para que el fen\u00f3meno \u00abselectividad de forma\u00bb tenga lugar, es necesario que las reacciones se produzcan en el interior de los canales de la zeolita, sin intervenir los centros activos que se encuentran en la superficie externa.  por ello se seleccion\u00f3 como objetivo en el presente trabajo el desarrollo de m\u00e9otodos de modificaci\u00f3n de zeolitas para neutralizar los centros activos de la superficie externa, sin bloquear o neutralizar actividad catal\u00edtica del interior de la estructura (objetivo 1), y el desarrollo de catalizadores altamente para-selectivos en la desaproporci\u00f3n de tolueno, alquilaci\u00f3n de tolueno con metanol o etanol (objetivo 2), en las que la actividad catal\u00edtica externa juega un papel fundamental.  de acuerdo al progrma de investigaci\u00f3n plantedo se seleccionaron dos reacciones teste, una cuyos par\u00e1metros de reacci\u00f3n permiten obtener informaci\u00f3n sobre la modificaci\u00f3n tanto externa como interna de la zeolita (desproproci\u00f3n de tolueno), y otra que proporciona informaci\u00f3n s\u00f3lo de la modificaci\u00f3n externa (isomerizaci\u00f3n de mesililieno). Como ctalizador base se seleccion\u00f3 zeolita zsm-5 de relaci\u00f3n si\/al=34.65 y tama\u00f1o medio de cristal 3.2 um. los catalizadores preparados por modificaci\u00f3n de esta zeolita, se caracterizaron por distintas t\u00e9cnicas. Como m\u00e9todos de modificaci\u00f3n se eligieron la impregnaci\u00f3n a humedad inicipiente,la impregnaci\u00f3n en fase vapor y la impregnaci\u00f3n a reflujo con un di<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Eliminaci\u00f3n de la acidez superficial externa en zeolitas tipo zsm<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Eliminaci\u00f3n de la acidez superficial externa en zeolitas tipo zsm <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Ruiz Fern\u00e1ndez Jos\u00e9 Antonio <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 10\/10\/2003<\/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>Mar\u00eda De Los \u00e1ngeles Uguina Zamorano<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: gabriel Ovejero escudero <\/li>\n<li>Jos\u00e9 lu\u00eds Valverde palomino (vocal)<\/li>\n<li>Jos\u00e9 Aguado alonso (vocal)<\/li>\n<li>Javier Pau gamarra (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ruiz Fern\u00e1ndez Jos\u00e9 Antonio La estructura cristalina de las zeolitas presenta una serie de canales y\/o cavidades [&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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