{"id":9371,"date":"2019-12-31T09:22:05","date_gmt":"2019-12-31T09:22:05","guid":{"rendered":"https:\/\/cit.upc.edu\/?post_type=portfolio&p=9371"},"modified":"2023-06-06T10:37:26","modified_gmt":"2023-06-06T10:37:26","slug":"un-catalitzador-capac-de-transformar-co2-en-etanol","status":"publish","type":"portfolio","link":"https:\/\/cit.upc.edu\/ca\/portfolio-item\/un-catalitzador-capac-de-transformar-co2-en-etanol\/","title":{"rendered":"Un catalitzador capa\u00e7 de transformar CO2 en etanol"},"content":{"rendered":"\n

El di\u00f2xid de carboni (CO2) es considera que \u00e9s el gas d\u2019efecte hivernacle m\u00e9s important, aix\u00ed com la causa principal de l\u2019escalfament global. Per aix\u00f2, utilitzar-lo com a mat\u00e8ria primera C1 per sintetitzar de manera eficient productes qu\u00edmics i industrials valuosos, com ara el mon\u00f2xid de carboni, el metanol, l\u2019etanol, l\u2019\u00e0cid f\u00f2rmic, les urees i els policarbonats, entre altres productes qu\u00edmics d\u2019alt valor, \u00e9s tant un repte acad\u00e8mic com una demanda social.
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El grup IMEM i l\u2019empresa B Braun Surgical han desenvolupat un catalitzador d\u2019hidroxiapatita, que s\u2019ha polaritzat el\u00e8ctricament mitjan\u00e7ant un proc\u00e9s d\u2019estimulaci\u00f3 t\u00e8rmica, per produir de manera ecol\u00f2gica i selectiva etanol a partir de CO2 i CH4. La reacci\u00f3, que produeix etanol com a producte principal, funciona de manera eficient tant a 95 \u00b0C sota l\u2019acci\u00f3 de radiaci\u00f3 UV com a 140 \u00b0C en abs\u00e8ncia d\u2019il\u00b7luminaci\u00f3. Encara que es forma etanol a la superf\u00edcie del catalitzador, amb una selectivitat superior al 90 %, a trav\u00e9s de la reducci\u00f3 electrocatal\u00edtica de CO2, l\u2019estudi del mecanisme de reacci\u00f3 ha posat de manifest que la pres\u00e8ncia d\u2019aigua \u00e9s crucial per promoure la formaci\u00f3 i l\u2019estabilitzaci\u00f3 de radicals reactius. D\u2019altra banda, la plasticitat del catalitzador ha perm\u00e8s modular-ne la selectivitat, disminuint la formaci\u00f3 d\u2019etanol en favor d\u2019altres productes qu\u00edmics valuosos, com ara el formaldehid i l\u2019acetona.\r
Com a prova de concepte, la reacci\u00f3 proposada s\u2019ha dut a terme amb \u00e8xit usant aire contaminat del tr\u00e0nsit per carretera. En aquest sentit, l\u2019obtenci\u00f3 d\u2019etanol i altres compostos qu\u00edmics a partir d\u2019aire contaminat obre una via nova per transformar les emissions de gasos d\u2019efecte hivernacle en productes qu\u00edmics valuosos mitjan\u00e7ant catalitzadors simples basats en un mineral abundant a la Terra.\r

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El di\u00f2xid de carboni (CO2) es considera que \u00e9s el gas d\u2019efecte hivernacle m\u00e9s important, aix\u00ed com la causa principal de l\u2019escalfament global. Per aix\u00f2, utilitzar-lo [\u2026]<\/span><\/p>\n","protected":false},"author":5,"featured_media":9372,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":[],"portfolio-types":[266],"class_list":["post-9371","portfolio","type-portfolio","status-publish","has-post-thumbnail","hentry","portfolio-types-tecnologias-quimicas-y-de-la-alimentacion-ca"],"yoast_head":"\nUn catalitzador capa\u00e7 de transformar CO2 en etanol - CIT UPC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cit.upc.edu\/ca\/portfolio-item\/un-catalitzador-capac-de-transformar-co2-en-etanol\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un catalitzador capa\u00e7 de transformar CO2 en etanol - CIT UPC\" \/>\n<meta property=\"og:description\" content=\"El di\u00f2xid de carboni (CO2) es considera que \u00e9s el gas d\u2019efecte hivernacle m\u00e9s important, aix\u00ed com la causa principal de l\u2019escalfament global. 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