Utjecaj parametara pripreme na fizikalno-kemijske i katalitičke značajke monolitnog Al/Al2O3-MnCu katalizatora

undergraduate thesis

• Title (english): Influence of preparation conditions on the physico-chemical and catalytic properties of the monolithic Al/Al2O3-MnCu catalyst
• Author: Marijana Perković
• Mentor: Vesna Tomašić (mentor)
• Committee member: Vesna Tomašić (predsjednik povjerenstva)
• Committee member: Igor Dejanović (član povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Reaction Engineering

Abstract

Hlapljivi organski spojevi (engl. Volatile organic compound, VOC) pripadaju najčešćim onečišćivalima zraka, a u atmosferu dolaze iz kemijske, petrokemijske i sličnih industrija. U najpoznatije predstavnike hlapljivih organskih spojeva ubrajaju se: benzen, ksilen, toluen i njima srodni spojevi. S ekološke točke gledišta, potrebno je ograničiti i smanjiti emisiju VOC-a u okoliš, jer njihova prekomjerna prisutnost u atmosferi utječe na klimatske promjene, suzbija rast odnosno uzrokuje propadanje biljnog svijeta te štetno utječe na zdravlje ljudi i životinja [1]. Cilj ovoga rada bio je pripremiti odgovarajuće monolitne katalizatore i ispitati njihove katalitičke značajke pri katalitičkoj oksidaciji toluena. Za tu svrhu korištena su tri prethodno anodizirana aluminijska monolitna supstrata. Prva dva supstrata impregnirana su vodenim otopinama manganovog (II) nitrata, bakrovog (II) nitrata i limunske kiseline u odgovarajućim molarnim omjerima mangana i bakra (Mn : Cu = 1 : 5 i Mn : Cu = 5 : 1), dok je treći monolitni katalizator pripremljen impregnacijom s vodenom otopinom koja se sastojala od otopine bakrova (II) nitrata i destilirane vode. Na taj način nanesena je katalitički aktivna komponenta na inertni metalni monolitni nosač, a u kasnijim fazama istraživanja ispitane su katalitičke značajke tako pripremljenih monolitnih katalizatora. Da bi se ispitao utjecaj pripreme na fizikalno-kemijske i katalitičke značajke monolitnog katalizatora provedeni su i dodatni eksperimenti koji su se odnosili na monolitni katalizator s omjerom Mn : Cu = 1 : 1. Kao predstavnik aromatskih hlapljivih organskih spojeva izabran je toluen, zbog njegove česte primjene u industriji kao polazne sirovine pri proizvodnji drugih spojeva te u obliku otapala. Katalitička oksidacija toluena provedena je uz konstantnu početnu koncentraciju toluena (210,43 ppm), pri različitim temperaturama (100-350 °C) te pri različitim ukupnim protocima reakcijske smjese (23-138 ml min^-1). Rezultati kinetičkih istraživanja pokazali su da katalizator s omjerom Mn : Cu = 5 : 1 pokazuje najbolju katalitičku aktivnost pri katalitičkoj oksidaciji toluena, jer je već pri temperaturi od 200 °C ostvarena 100 %-tna konverzija toluena.

Abstract (english)

Volatile organic compounds are the most common air pollutants, coming from the chemical, petrochemical and similar industrial sources. Some of the well known volatile organic compounds representatives include: benzene, xylene, toluene and related compounds. From an environmental point of view, it is necessary to limit and reduce emissions of VOCs into the environment, because their excessive concentration in the atmosphere affects climate change, suppress growth and cause deterioration of plants and adversely affects the health of people and animals [1]. The aim of this study was to prepare monolithic catalysts and examine their catalytic properties during the catalytic oxidation of toluene. For this purpose, the three pre-anodized aluminum monolithic substrate was used. The first two substrates were impregnated with the aqueous solutions of manganese (II) nitrate and copper (II) nitrate in the presence of citric acid in respective molar ratios (Mn : Cu = 1 : 5, Mn : Cu = 5 : 1) and the third monolithic catalyst was prepared by impregnation with an aqueous solution of copper (II) nitrate and distilled water. In this way, the catalytically active component was loaded on an inert metal monolithic carrierand in the later stages of the study the catalytic performances of the so prepared monolithic catalysts were tested. In order to investigate the influence of the preparation method on the physico-chemical and catalytic properties of the monolithic catalysts additional experiments were performed including the catalyst with the ratio Mn : Cu = 1 : 1. Toluene was used as a representative of the aromatic volatile organic compounds due to its frequent application in the industry as starting materials for the production of other products and as a solvents. The catalytic oxidation of toluene was carried out using various monolithic catalysts whose physico-chemical properties were the result of the appropriate methods of preparation. Catalytic oxidation of toluene was performed at the constant initial concentrations of toluene (210.43 ppm), at different temperatures (100-350 °C) and at various total flow rates of the reaction mixture (23-138 ml min^-1). Results of the kinetic studies have shown that the catalyst with a ratio Mn : Cu = 5 : 1 showed the best catalytic activity for the catalytic oxidation of toluene, which already at a temperature of 200 °C achieved a 100% conversion of toluene.

• Keywords: VOC; anodizirani aluminijski monolitni nosač; Mn-Cu katalizator; CuOx -katalizator; toluen; katalitička oksidacija
• Keywords (english): VOCs; anodized aluminum monolithic carrier; Mn-Cu catalyst; CuOX catalyst; toluene; catalytic oxidation
• Language: croatian
• URN:NBN: urn:nbn:hr:149:046419
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-03-18 12:35:06