Katalitička oksidacija toluena na keramičkim monolitnim katalizatorima

master's thesis

• Title (english): Catalytic oxidation of toluene on ceramic monolithic catalysts
• Author: Lucija Ivanjko
• Mentor: Vesna Tomašić (mentor)
• Committee member: Vesna Tomašić (predsjednik povjerenstva)
• Committee member: Igor Dejanović (član povjerenstva)
• Committee member: Aleksandra Sander (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Reaction Engineering

Abstract

Katalitička oksidacija hlapljivih organskih spojeva (VOC), poput benzena, toluena i ksilena, je u posljednjih dvadeset godina predmet brojnih istraživanja, ponajviše zbog njihove toksične i kancerogene prirode. Također, VOC indirektno djeluju kao prekursori nastajanja prizemnog ozona i smoga. Katalitička oksidacija pokazala se kao jedna od najučinkovitijih i ekološki prihvatljivih metoda koja uspješno zadovoljava stroge zakonske regulative vezane uz dopuštene emisije VOC-a u okoliš. Eksperimentalni dio ovog rada usmjeren je na razvoj keramičkih monolitnih katalizatora za potpunu oksidaciju toluena pri niskim temperaturama. Tanki sloj miješanih oksida mangana i bakra nanesen je na kordijeritni monolitni supstrat metodom impregnacije. Korišteni su monolitni supstrati različitih dužina (2, 4, 6, 8 cm). Katalitička oksidacija toluena provedena je u monolitnom reaktoru uz stacionarne uvjete te pri različitim reakcijskim temperaturama i prostornim vremenima. Pripremljeni monolitni katalizatori pokazali su veliku katalitičku aktivnost i stabilnost. Katalitička aktivnost pripremljenih katalizatora potom je uspoređena s aktivnošću keramičkih i metalnih monolitnih katalizatora testiranih u prethodnim istraživanjima. Utjecaj reakcijskih varijabli na brzinu oksidacije toluena analiziran je pomoću jednostavnog kinetičkog modela prvog reda i jednodimenzijskog (1D) heterogenog modela reaktora. Validacijom modela utvrđeno je da se predloženi model reaktora može uspješno primijeniti za opisivanje eksperimentalnih monolitnih reaktora korištenih u ovom radu.

Abstract (english)

Catalytic oxidation of volatile organic compounds (VOCs), such as benzene, toluene and xylene, has been the subject of many studies over the past 20 years, due to their toxic, mutagenic and carcinogenic nature. In adittion, VOCs act indirectly as ozone and smog precursors. Catalytic oxidation has been recognized as one of the most efficient and environmentally friendly techniques that can satisfy the criteria of permissible emissions of VOCs into the environment. Experimental part of this work is focused on development of the ceramic monolithic catalysts for total oxidation of toluene at low temperature. A thin layer of mixed manganese and cooper oxides was deposited on a cordierite substrate by impregnation method. Four cordierite substrates of different lenght (2, 4, 6, 8 cm) were used. Catalytic oxidation of toluene was performed under steady-state conditions in a monolithic reactor operating over a wide range of reaction temperatures and at various space times. Prepared monolithic catalysts showed excellent activity and stability. Catalytic activity of prepared catalysts was compared with the activity of ceramic and metal monolithic catalysts which were tested in previous research. The influence of reaction variables on the rate of toluene oxidation was examined using the simple first-order kinetic model and the one-dimensional (1D) heterogeneous model to describe the reaction system. Validation of the applied models showed that suggested models can be used for describing experimental monolithic reactors which were tested in this work.

• Keywords: katalitička oksidacija; hlapljivi organski spojevi; toluen; keramički monolitni katalizator (Mn-CuOx/kordijerit)
• Keywords (english): catalytic oxidation; volatile organic compounds; toluene; ceramic monolithic catalyst (Mn-CuOx/cordierite)
• Language: croatian
• URN:NBN: urn:nbn:hr:149:854137
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-07-23 10:47:27