Priprava i karakterizacija cerijeva(IV) oksida oplemenjenog nanočesticama bakra

master's thesis

• Title (english): The preparation and characterization of ceria amended with copper nanoparticles
• Author: Josipa Kolar
• Mentor: Stanislav Kurajica (mentor)
• Committee member: Stanislav Kurajica (predsjednik povjerenstva)
• Committee member: Katarina Mužina (član povjerenstva)
• Committee member: Gordana Matijašić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj ovog rada je pripraviti mezostrukturirani cerijev(IV) oksid (CeO2) te ga oplemeniti nanočesticama bakra (CuNP). Mezostrukturirani cerijev(IV) oksid pripravljen je metodom nanolijevanja u kojoj je silika služila kao mezoporozni predložak. Nanočestice bakra pripremljene su metodom redukcije s NaBH4. Karakterizacija uzoraka provedena je UV-Vis, DLS, XRD, FTIR, SEM/ EDS, UV-Vis DRS te BET analizom. Pripravljeni uzorci sastoje se od finih nepravilnih čestica različitih veličina. Raspodjela cerija, kisika i bakra u uzorcima je homogena, no zapažena je prisutnost zaostalog silicija i natrija. Uzorak dobiven uz više ciklusa uranjanja CeO2 u nanočestice bakra sadrži nešto više bakra. Specifična površina pripravljenih uzoraka CeO2 znatno je manja od SiO2 dok je prosječni promjer pora veći. Uzorci CeO2 bez, i s različitim udjelima bakra ne razlikuju se znatno po specifičnoj površini i promjeru pora. Uzorak CeO2 bez bakra pokazuje bolju katalitičku aktivnost od uzoraka s nanočesticama bakra.

Abstract (english)

The aim of this work is to synthesize mesostructured cerium(IV) oxide (CeO₂) and enhance it with copper nanoparticles (CuNP). The mesostructured cerium(IV) oxide was synthesized using the nanocasting method, where silica was used as a mesoporous template. Copper nanoparticles were prepared by the reduction method using NaBH₄. Sample characterization was carried out using UV-Vis, DLS, XRD, FTIR, SEM/EDS, UV-Vis DRS, and BET analysis. The prepared samples consist of fine irregular particles of varying sizes. The distribution of cerium, oxygen, and copper in the samples is homogeneous, although residual silicon and sodium were observed. The sample obtained after multiple dipping cycles of CeO₂ in the copper nanoparticle solution contains a slightly higher copper content. The specific surface area of the CeO₂ samples is significantly smaller than that of SiO₂, while the average pore diameter is larger. CeO₂ samples with and without different copper contents do not differ significantly in terms of specific surface area and pore diameter. The CeO₂ sample without copper exhibits better catalytic activity compared to the samples with copper nanoparticles.

• Keywords: cerijev(IV) oksid; nanočestice bakra; nanolijevanje; katalitička aktivnost
• Keywords (english): cerium(IV) oxide; copper nanoparticles; nanocasting; catalytic activity
• Language: croatian
• URN:NBN: urn:nbn:hr:149:717979
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-10-01
• Created on: 2024-11-07 13:18:11