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Identifier

000426152

Title

Οργανωμένες Μεσοπορώδεις Ετεροδομές Zr1-xCexO2: Σύνθεση, Χαρακτηρισμός και Εφαρμογή στην Φωτοκαταλυτική Οξείδωση Άρυλο Αλκοολών

Author

Γκότσι, Εσμεράλντα

Thesis advisor

Αρματάς, Γεράσιμος

Reviewer

Κοπιδάκης, Γεώργιος
Ρεμεδιάκης, Ιωάννης

Abstract

In this thesis work, we present the synthesis of high-surface area mesoporous materials of ZrO2–CeO2 composition. A series of mesoporous ZrO2-based CeO2 nanocomposite frameworks (Ce/ZrO2) has been successfully prepared through a polymer-assisted sol-gel copolymerization route. The pore walls of these heterostructures consist of nanocrystalline tetragonal ZrO2 and CeO2 components with different CeO2 loadings, i.e. 2, 3, 5 and 10 wt %. Structural characterization by X-ray diffraction (XRD) and N2 physisorption measurements indicated a well-crystalline structure with large internal BET (Brunauer, Emmett and Teller) surface area and quite narrow pore size distribution. The ZrO2–CeO2 composition of as-prepared samples was confirmed by elemental X-ray microanalysis (EDS) and diffuse-reflectance UV/vis spectroscopy. The obtained Ce/ZrO2 nanocomposites demonstrated great application potential in oxidative catalysis. Catalysis studies showed that these new materials, which entail a high density of surface-active sites and open pore structure, are shown to be quite effective in the photo-oxidation of aryl alcohols. Our results indicated that the inclusion of CeO2 compounds in mesoporous structure has a beneficial effect on the catalytic activity of these materials. Although ZrO2 alone shows little photocatalytic activity, the Ce/ZrO2 heterostructures possess a remarkable activity and chemical stability for the photo-oxidation of various 1-phenyl and benzyl-alcohols to the corresponding ketones and aldehydes, under λ > 360 nm light irradiation, using molecular oxygen as oxidant.

Language

English, Greek

Issue date

2019-11-22

Collection

School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses

Type of Work--Post-graduate theses

Views

380

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