Kinetika katalitičke oksidacije toluena u plinskoj fazi na miješanim oksidima mangana

master's thesis

• Title (english): Kinetics of the gas phase catalytic oxidation of toluene over mixed manganese oxides
• Author: Josipa Smolković
• Mentor: Vesna Tomašić (mentor)
• Committee member: Vesna Tomašić (predsjednik povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Committee member: Karolina Maduna (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Reaction Engineering

Abstract

Hlapljivi organski spojevi (eng. volatile organic compounds, VOC) velika su grupa organskih spojeva koji zbog svoje strukture lako isparavaju pri normalnim atmosferskim uvjetima temperature i tlaka, a najvećim dijelom emisija hlapljivih organskih spojeva poput toluena je rezultat proizvodnje i uporabe organskih kemijskih proizvoda i distribucije fosilnih goriva te izgaranja goriva u motornim vozilima. Progresivni porast emisija VOC u okoliš i njihov štetni učinak rezultirao potrebom za istraživanjem tehnologija koje su ekonomski isplative i dovode do učinkovite razgradnje onečišćujućih tvari kao što je toluen. U tom kontekstu katalitička oksidacija pokazala se obećavajućom tehnologijom, a kao katalizatori visoke aktivnosti pokazali su se jednostavni oksidi mangana budući da su jeftini i otporniji na trovanje. U ovome radu pripremljen je miješani metalni oksid mangana i željeza u praškastom i monolitnom obliku i zatim je provedena katalitička oksidacija toluena kao modelne komponete u dvije izvedbe reaktora: a) u cijevnom reaktoru s nepokretnim slojem katalizatora pri konstantnoj koncentraciji toluena (210,43 ppm), uz konstantnu masu katalizatora (0,05 g), pri različitim temperaturama (100–230 °C) i ukupnim protocima reakcijske smjese (23–138 mL/min), b) u monolitnom reaktoru također pri različitim uvjetima provedbe procesa, tj. pri konstantnoj koncentraciji toluena (210,43 ppm), uz konstantnu masu katalizatora (0,0037 g), pri različitim temperaturama (100–300 °C) te pri različitim ukupnim protocima reakcijske smjese (23–138 mL/min). Zatim je provedena karakterizacija i ispitivanje katalitičkih značajki pripremljenih katalizatora. Analiziran je rad reaktora primijenjenih u eksperimentu i pritom su korišteni jednodimenzijski pseudohomogeni model i model s unutarfaznom difuzijom za modeliranje cijevnog reaktora s nepokretnim slojem, dok je za modeliranje metalnog monolitnog reaktora primijenjen model koji je također uključivao međufazu difuziju. U završnom dijelu ovog rada provedena je ocjena prihvatljivosti predloženih modela na temelju usporedbe rezultata dobivenih primjenom modela s eksperimentalnim rezultatima uz procjenu parametara modela.

Abstract (english)

Volatile Organic Compounds (VOCs) are a large group of organic compounds that because of its structure easily evaporate at normal atmospheric conditions of temperature and pressure, and most of the emission of volatile organic compounds such as toluene is a result of the production and use of organic chemical products and distribution fossil fuels and fuel combustion in motor vehicles. The progressive increase in VOC emissions to the environment and their adverse effect resulted in the need for research technologies that are economically feasible and lead to effective degradation of pollutants such as toluene. In this context, catalytic oxidation has proved to be a promising technology, and as high activity catalysts have proved to be a simple oxide of manganese as they are cheap and more resistant to poisoning. In this paper mixed metal oxide of manganese and iron was prepared in powder and monolithic form and then catalytic oxidation of toluene as a model components is carried out out in two types of reactors: a) a tubular reactor in a fixed bed reactor at a constant concentration of toluene (210,43 ppm) and a constant weight (0,05 g), at different temperatures (100–275 °C) and the total flow of the reaction mixture (23–138 mL/min), b) in the monolithic reactor also in various conditions of the process, i.e. at a constant concentration of toluene (210,43 ppm), with a constant weight of the catalyst (0,0024 g), at different temperatures (100–215 °C) and at different total flow rates of the reaction mixture (23-138 mL/min). Then is performed characterization and testing of catalytic characteristics of prepared catalyst. For the purpose of further analysis of the reactor used in the work applied as one-dimensional model pseudo-homogeneous model for modeling tubular reactor with a fixed bed, while the modeling of the metal monolithic reactor model was applied which is also included interphase diffusion. In the final part of this work was conducted to assess the acceptability of applied models by comparing experimental results with theoretical results obtained with the proposed model and the estimated parameters of the model.

• Keywords: VOC; katalitička oksidacija; toluen; manganovi oksidi; Mn-Fe katalizator; monolitni reaktor
• Keywords (english): VOC; catalytic oxidation; toluene; manganese oxides; Mn-Fe catalyst; monolithic reactor
• Language: croatian
• URN:NBN: urn:nbn:hr:149:690892
• 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: 2017-10-18 12:43:28