Priprava Mn3O4 katalizatora na nosaču od γ-Al2O3

master's thesis

• Title (english): The preparation of γ-Al2O3 supported Mn3O4 catalyst
• Author: Karla Miloš
• Mentor: Stanislav Kurajica (mentor)
• Committee member: Stanislav Kurajica (predsjednik povjerenstva)
• Committee member: Gordana Matijašić (član povjerenstva)
• Committee member: Katarina Mužina (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom radu pripremljen je Mn3O4 katalizator na nosaču od γ-Al2O3 metodom sušenja s raspršivanjem (eng. spray drying) iz vodene otopine aluminijeva nitrata nonahidrata i manganova(II) nitrata tetrahidrata, uz limunsku kiselinu kao kompleksator i amonijevu lužinu kao pH modifikator. Tako dobiveni uzorci i termički obrađeni uzorci karakterizirani su rendgenskom difrakcijskom analizom (XRD), infracrvenom spektroskopijom s Fourierovom transformacijom (FTIR), pretražnom elektronskom mikroskopijom s energijski razlučujućom rendgenskom spektroskopijom (SEM-EDS), diferencijalnom toplinskom i termogravimetrijskom analizom (DTA-TGA) i fizisorpcijom N2. Katalitička aktivnost pripremljenih katalizatora ispitana je katalitičkom oksidacijom toluena. XRD analiza pokazala je prisutnost amonijeva nitrata kod termički neobrađenih uzoraka koju je potvrdila i FTIR analiza. Kod termički obrađenih uzoraka potvrđena je prisutnost γ-, odnosno α-alumine ovisno o temperaturi termičke obrade. SEM-EDS analiza pokazala je da su dobiveni porozni uzorci s homogenom raspodjelom elemenata. Najveću katalitičku aktivnost pokazao je uzorak s najvećim udjelom mangana.

Abstract (english)

In this paper, γ-Al2O3 supported Mn3O4 catalyst was prepared using the spray drying method. The samples were prepared from an aqueous solution of aluminum nitrate nonahydrate and manganese (II) nitrate tetrahydrate with citric acid as complexing agent and ammonium hydroxide as pH modifier. The samples thus obtained and thermally treated samples were characterized by X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), differential thermal and thermogravimetric analysis (DTA-TGA) and by N2 physisorption. The catalytic activity of the prepared catalysts was tested in catalytic oxidation of toluene. XRD analysis showed the presence of ammonium nitrate in thermally untreated samples, which was also confirmed by FTIR analysis. In heat-treated samples, the presence of γ- or α-alumina was confirmed depending on the heat treatment temperature. SEM-EDS analysis showed that porous samples with a homogeneous distribution of elements were obtained. The sample with the highest amount of manganese showed the highest catalytic activity.

• Keywords: aluminijev oksid; manganov oksid; metoda sušenja s raspršivanjem
• Keywords (english): aluminum oxide; manganese oxide; spray drying method
• Language: croatian
• URN:NBN: urn:nbn:hr:149:420422
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Applied organic chemistry; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra primijenjene kemije (sveučilišni/a magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-11-24 09:18:50