Katalitička oksidacija BTEX u monolitnom reaktoru

master's thesis

• Title (english): Catalytic oxidation of BTEX in the monolithic reactor
• Author: Ivana Elizabeta Zelić
• Mentor: Vesna Tomašić (mentor)
• Committee member: Vesna Tomašić (predsjednik povjerenstva)
• Committee member: Vanja Kosar (član povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Onečišćenje okoliša problem je kojem se u današnje vrijeme posvećuje sve veća pažnja. Uslijed naglog industrijskog razvoja te sve većeg inteziteta antropogenih aktivnosti u okoliš dospijeva sve veći broj onečišćujućih tvari. Hlapljivi organski spojevi koji pri normalnim uvjetima tlaka i temperature vrlo lako isparavaju predstavljaju jednu od najznačajnijih skupina spojeva koji uvjetuju onečišćenje atmosfere. Postoje brojne metode kojima se nastoji spriječiti emisija hlapljivih organskih spojeva u okoliš. Pritom se katalitička oksidacija pokazala obećavajućim postupkom razgradnje hlapljivih organskih spojeva te jednim od najučinkovitijih i ekonomski najprihvatljivijih postupaka za njihovu oksidaciju/razgradnju. Cilj ovoga rada bio je razvoj keramičkog monolitnog katalizatora za katalitičku oksidaciju aromatskih hlapljivih organskih spojeva. Razvoj katalizatora uključivao je nanošenje katalitički aktivnih komponenata na inertne monolitne nosače, pri čemu je u prvom slučaju korišten komercijalni inertni monolitni nosač (kordijerit), a u drugom slučaju je tehnologijom 3D tiska (ili aditivne proizvodnje; engl. additive manufacturing) pripremljen kristobalitni monolitni nosač. U oba slučaja kao katalitički aktivna komponenta korišten je miješani oksid mangana i bakra koji je u ranijim istraživanjima pokazao visoku učinkovitost u sličnim eksperimentalnim sustavima. Istraživanja su provedena primjenom toluena kao pojedinačne komponente i smjese organskih spojeva koja je sadržavala benzen, toluen, etilbenzen i ksilen (BTEX). Reakcije su provedene pri različitim temperaturama uz konstantan ukupan protok reakcijske smjese. Tijekom rada provedena je i usporedba aktivnosti pripremljenih katalizatora s aktivnošću komercijalnog monolitnog katalizatora koji je u svom sastavu sadržavao plemenite metale kao katalitički aktivne komponente. Nađeno je da se tehnologija aditivne proizvodnje može uspješno primijeniti za pripremu monolitnih katalizatora za katalitičku oksidaciju hlapljivih organskih spojeva. Kordijeritni monolitni i kristobalitni monolitni nosači sa slojem MnCuOx pokazali su se učinkovitim katalizatorima za oksidaciju benzena, toluena, etilbenzena i o-ksilena. Ustanovljeno je da se pripremljeni monolitni katalizatori mogu koristiti kao zamjena za skupe komercijalne katalizatore koji sadrže teško dostupne i skupe plemenite metale.

Abstract (english)

Environmental pollution is a problem that is getting more and more attention nowadays. Due to the sudden industrial development and the increasing intensity of anthropogenic activities there is an increasing number of pollutants in the environment. Volatile organic compounds, which under normal pressure and temperature conditions easily evaporate, are one of the most significant groups of compounds that cause atmospheric pollution. There are numerous methods to prevent the release of volatile organic compounds into the environment. Catalytic oxidation proved to be a promising process for the degradation of volatile organic compounds and one of the most efficient and economically most acceptable processes for their oxidation / decomposition. The aim of this work was the development of a ceramic monolithic catalyst for catalytic oxidation of aromatic volatile organic compounds. The development of the catalyst involved the application of catalytically active components to inert monolithic carriers, in which a commercial inert monolithic carrier (cordierite) was used in the first case. In the other case a crystalline monolithic carrier was prepared by 3D printing technology (or additive manufacturing). In both cases mixed manganese and copper oxide were used as a catalytically active component, which in previous studies showed high efficiency in similar experimental systems. Studies were conducted using toluene as a single component and mixture of organic compounds containing benzene, toluene, ethylbenzene and xylene (BTEX). The reactions were carried out at different temperatures and a constant total flow of the reaction mixture. During the work there was also a comparison of activity of the prepared catalyst with the activity of a commercial monolithic catalyst, which in its composition contained noble metals as a catalytically active component. The experiment showed that additive manufacturing can be successfully used for the preparation of monolithic catalysts for catalytic oxidation of volatile organic compounds. During the whole process cordierite monolithic and crystalline monolithic carriers with the MnCuOx layer proved to be effective catalysts for benzene, toluene, ethylbenzene and o-xylene oxidation. It was established that prepared monolithic catalysts can be used as a substitute for expensive commercial catalysts containing heavily accessible and expensive noble metals.

• Keywords: hlapljivi organski spojevi; katalitička oksidacija; BTEX; monolitni katalizator; tehnologija aditivne proizvodnje
• Keywords (english): volatile organic compounds; catalytic oxidation; BTEX; monolithic catalyst; additive manufacturing
• Language: croatian
• URN:NBN: urn:nbn:hr:149:979248
• Project: Number: IP-2018-01-8669; Title: Intenzifikacija fotokatalitičkih i katalitičkih procesa za obradu otpadnih voda i otpadnih plinova; Acronym: IN-PhotoCat; Leader: Vesna Tomašić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2022-02-27 21:27:59