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undergraduate thesis
Sinteza čvrstih otopina na bazi cerija i cirkonija
2020. urn:nbn:hr:182:285871
Ivanković, Ana
Josip Juraj Strossmayer University of Osijek
Department of Chemistry

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Ivanković, A. (2020). Sinteza čvrstih otopina na bazi cerija i cirkonija (Undergraduate thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:285871

Ivanković, Ana. "Sinteza čvrstih otopina na bazi cerija i cirkonija." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2020. https://urn.nsk.hr/urn:nbn:hr:182:285871

Ivanković, Ana. "Sinteza čvrstih otopina na bazi cerija i cirkonija." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2020. https://urn.nsk.hr/urn:nbn:hr:182:285871

Ivanković, A. (2020). 'Sinteza čvrstih otopina na bazi cerija i cirkonija', Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 12 December 2024, https://urn.nsk.hr/urn:nbn:hr:182:285871

Ivanković A. Sinteza čvrstih otopina na bazi cerija i cirkonija [Undergraduate thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2020 [cited 2024 December 12] Available at: https://urn.nsk.hr/urn:nbn:hr:182:285871

A. Ivanković, "Sinteza čvrstih otopina na bazi cerija i cirkonija", Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:182:285871

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Metadata
TitleSinteza čvrstih otopina na bazi cerija i cirkonija
Title (english)Systhesis of ceria-zirconia solid solutions
AuthorAna Ivanković
MentorIgor Đerđ (mentor)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
Osijek
Defense date and country2020-09-24, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Cerijevi oksidi, a prvenstveno \( CeO_{2}\), smatraju se spojevima sa izvrsnim katalitičkim svojstvima. Materijali na bazi \( CeO_{2}\) se upotrebljavaju u različitim katalitičkim reakcijama, često kao nosači aktivnih čestica metala, zatim kao kokatalizatori pohrane kisika u naknadnoj obradi ispušnih plinova u automobilima, a čak i kao katalitički aktivne komponente u reakcijama oksidacije kataliziranim s HCl-om (Deaconova reakcija). Ce je lantanoid koji se u redoks reakcijama može reverzibilno prevoditi iz +3 oksidacijskog stanja u +4 oksidacijsko stanje. \( CeO_{2}\) ima sposobnost pohrane i otpuštanja kisika pa se koristi kao katalizator u redoks reakcijama. Iako je \( CeO_{2}\) izrazito aktivan, on nije termički stabilan pa se stoga dopira sa cirkonijem koji je termički stabilan. Radijus \( Zr^{4+}\) je puno manji od radijusa \( Ce^{4+}\) pa se samim time poboljšava termička stabilnost \( CeO_{2}\) i povećava se kapacitet pohrane kisika. U ovom završnom radu, sintetizirani su spojevi u kojima je cerijev oksid dopiran 2%, 3%, 4% i 5% s cirkonijem, a dobiveni spojevi su analizirani rentgenskom difrakcijom na prahu (PXRD), pretražnom elektronskom mikroskopijom (SEM) i termogravimetrijskom analizom (TGA).
Abstract (english)
Cerium oxides, mainly \( CeO_{2}\), are considered to be compounds with great catalytic properties. \( CeO_{2}\) -based materials are employed in a variety of different applications in catalysis acting as carrier for the active metal particles, oxygen storage co-catalysts in exhaust gas post-treatment in automobiles, or even as a catalytically active component such as in the catalyzed HCl oxidation reaction (Deacon reaction). Ce is a lanthanide, which in redox reactions can reversibly change its oxidation state from +3 to +4. \( CeO_{2}\) has ability to store and release oxygen and therefore is used as catalyst in redox reactions. Although \( CeO_{2}\) is extremely active, it is not thermally stable. Because of that Ce-compounds are doped with zirconia which is thermally stable. Radius of \( Zr^{4+}\) is smaller than the radius of \( Ce^{4+}\) cation, which is responsible for the improvement of thermal stability of \( CeO_{2}\) and an increase of oxygen storage capacity. In this thesis, cerium oxides are doped with zirconia in ratios of 2%, 3%, 4% and 5% and obtained materials have been synthesized and further analyzed by using powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA).
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:285871
ProjectNumber: HRZZ-PZS-2019-02-2467
Title: Istraživanje utjecaja metalnih promotora rijetkih zemalja i stupnja uređenja na redoks svojstva sustava Ceo2-ZrO2
Leader: Igor Đerđ
Jurisdiction: Croatia
Funder: HRZZ
Study programmeTitle: Chemistry
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) kemije)
Type of resourceText
File originBorn digital
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Created on2020-12-14 13:05:05