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master's thesis
Hidrotermalna sinteza dopiranog nanokristaličnog CeO2
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2017. urn:nbn:hr:149:556124
Guliš, Martina
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

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Guliš, M. (2017). Hidrotermalna sinteza dopiranog nanokristaličnog CeO2 (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:556124

Guliš, Martina. "Hidrotermalna sinteza dopiranog nanokristaličnog CeO2." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:149:556124

Guliš, Martina. "Hidrotermalna sinteza dopiranog nanokristaličnog CeO2." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:149:556124

Guliš, M. (2017). 'Hidrotermalna sinteza dopiranog nanokristaličnog CeO2', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:556124

Guliš M. Hidrotermalna sinteza dopiranog nanokristaličnog CeO2 [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2017 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:149:556124

M. Guliš, "Hidrotermalna sinteza dopiranog nanokristaličnog CeO2", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:149:556124

Metadata
TitleHidrotermalna sinteza dopiranog nanokristaličnog CeO2
Title (english)Hydrothermal synthesis of doped nanocrystalline ceria
AuthorMartina Guliš
MentorStanislav Kurajica (mentor)
Committee memberStanislav Kurajica (predsjednik povjerenstva)
Committee memberVesna Tomašić (član povjerenstva)
Committee memberJuraj Šipušić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2017-09-25, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Basic Technical Sciences
Materials
Abstract
Pripravljeni su i karakterizirani uzorci čistog i dopiranog cerijeva (IV) oksida, CeO2, te je testirana njihova katalitička aktivnost u procesu katalitičke oksidacije toluena koji je upotrijebljen kao modelni hlapljivi organski spoj. Provedena je serija sinteza nanočestica čistog CeO2 i dopiranog CeO2 sa 10 % množinskog udjela sljedećih dopanada: Mn, Fe, Co, Ni, Cu, Zn, Cd i Al. Hidrotermalna sinteza provedena je bez ikakvih aditiva koji bi smanjili katalitičku aktivnost i mogli biti štetni za okoliš. Pripravljeni uzorci te uzorci zagrijavani 2 h na 500 °C analizirani su rendgenskom difrakcijom. Veličina kristalita izračunata je pomoću Scherrerove metode. Odabrani uzorci analizirani su infracrvenom spektroskopijom s Fourierovom transformacijom (FTIR), energijskom razlučujućom rendgenskom spektroskopijom (EDX), transmisijskim elektronskim mikroskopom visoke rezolucije (HR - TEM), spektroskopijom gubitka energije elektrona (EELS) te su određene N2 adsorpcijske / desorpcijske izoterme. Katalitička aktivnost je utvrđena na temelju oksidacije toluena u cijevnom reaktoru s nepokretnim slojem katalizatora, CeO2. Dobiveni rezultati pokazuju kako su Mn, Cu i Zn uspješno dopirani u kristalnu rešetku te nisu dobivene dodatne kristalne faze na difraktogramima. Kod dopiranja s ostalim metalnim kationima dolazi do nastanka dodatnih kristalnih faza, no ti rezultati ne isključuju ulazak kationa u rešetku. Dobivene veličine kristalita pripravljenih uzoraka čistog i dopiranog CeO2 nalaze se između 3 - 5 nm, dok su iste nakon termičke obrade između 9 - 17 nm. Veličina kristalita odgovara rezultatima dobivenim transmisijskom elektronskom mikroskopijom. CeO2 dopiran s Cu i Mn pokazao je značajnu katalitičku aktivnost za oksidaciju toluena. Uzorci dopirani sa Fe, Ni i Zn nisu pokazali značajno unaprjeđenje katalitičke aktivnosti dok su uzorci dopirani s Cd, Co i Al pokazali smanjenje katalitičke aktivnosti tijekom oksidacije toluena.
Abstract (english)
Pure and doped nanocrystalline ceria have been prepared, characterized and tested for catalytic activity in process of catalytic oxidation of toluene as volatile organic compound model. A series of hydrothermal synthesis was performed and the products were pure ceria and doped ceria where 10 at. % of Ce was replaced with Mn, Fe, Co, Ni, Cu, Zn, Cd and Al. Hydrothermal synthesis was performed without additives which would reduce the catalytic activity or could be toxic for the environment. The prepared samples and samples thermally treated at 500 °C for 2 h are studied by X-ray diffraction (XRD). Average crystalline sizes were calculated using Scherrer’s method. Selected samples were also analyzed with Fourier transformation infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM), electron energy loss spectroscopy (EELS) and N2 adsorption/desorption isotherms. Catalytic activity was tested based on the toluene oxidation process in a tube reactor with a fixed catalyst layer. The obtained results show that Mn, Cu and Zn were successfully incorporated into the crystal lattice without additional crystalline phases, while for other investigated metals additional crystal phases appear. Crystallite sizes of prepared doped ceria samples were between 3 and 5 nm, while thermal treatment causes the increase in crystallite size to a range between 9 and 17 nm. Crystallite size matches well with particle size determined using TEM. CeO2 doped with Cu i Mn showed significant catalytic activity for process of toluene oxidation. Samples doped with Fe, Ni and Zn did not show significant advancement of catalytic activity while samples doped with Cd, Co and Al showed a decrease in catalytic activity for toluene oxidation process.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:556124
Study programmeTitle: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry
Course: Advanced materials and technologies
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-04-22 12:17:12