prikaz prve stranice dokumenta Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine
Embargo period 2025-03-10
doctoral thesis
Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine
Zagreb: University of Zagreb, Faculty of Science, 2023. urn:nbn:hr:217:540133
Medak, Glorija
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

Cite this document

Medak, G. (2023). Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:540133

Medak, Glorija. "Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine." Doctoral thesis, University of Zagreb, Faculty of Science, 2023. https://urn.nsk.hr/urn:nbn:hr:217:540133

Medak, Glorija. "Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine." Doctoral thesis, University of Zagreb, Faculty of Science, 2023. https://urn.nsk.hr/urn:nbn:hr:217:540133

Medak, G. (2023). 'Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine', Doctoral thesis, University of Zagreb, Faculty of Science, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:217:540133

Medak G. Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Science; 2023 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:217:540133

G. Medak, "Utjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine", Doctoral thesis, University of Zagreb, Faculty of Science, Zagreb, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:217:540133

Metadata
TitleUtjecaj jakosti kiselih mjesta u zeolitima na konverziju metanola u olefine
Title (english)Influence of acid sites strength on conversion of methanol to olefines
AuthorGlorija Medak
MentorJosip Bronić (mentor)
Committee memberMarina Cindrić (predsjednik povjerenstva)
Committee memberDamir Kralj (član povjerenstva)
Committee memberIvan Halasz (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2023-03-10, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Universal decimal classification
(UDC)		54 - Chemistry. Crystallography. Mineralogy
Abstract
Na zeolitima strukturnih tipova FAU i MFI (ZSM-5) napravljene su modifikacije tijekom ili nakon sinteze kao bi se poboljšala njihova katalitička aktivnost. Pripremljeni uzorci su modificirani dodatkom mezoporoznog templata N,N,N-trimetilheksadekan-1-amonijeva bromida (CTAB) ili jetkani vodenom otopinom natrijeva hidroksida, kako bi se povećao broj mezopora u kristalima i olakšala difuzija reaktanata do aktivnog mjesta. Jakost aktivnog mjesta ugađana je kationskom zamjenom s ionima Mg2+, Co2+, Ni2+ i Zn2+ (u vodenoj otopini i mehanokemijski). Utjecaj pojedinog metalnog kationa na broj i jakost Lewisovih i Brønstedovih kiselih mjesta u materijalu praćen je infracrvenom spektroskopijom u vakuumu pomoću adsorpcije probne molekule (deuterirani acetonitril). Broj pojedinih kiselih mjesta dobiven je integriranjem pojedinih krivulja nakon dekonvolucije spektra vezanog D3-acetonitrila, anjihova jakost određena je iz količine nakon zagrijavanja na 150, 200 i 300°C. Na odabranim uzorcima napravljeni su katalitički testovi konverzije metanola u olefine.
Abstract (english)
Modifications during and after sythesis were made on FAU and MFI (ZSM-5) zeolite type samples in order to enhance their catalytic activity. Prepared samples were modified with mesoporosity template N,N,N-Trimethylhexadecan-1-aminium bromide (CTAB) or etched with water solution of sodium hydroxide to increase the volume of mesopores in crystals and faciliate diffusion of reactnats to the active site. The strength of active sites was modified by cationic exchange with Mg2+, Co2+, Ni2+ and Zn2+ ions (in water solution and mechanochemicaly). Effect of metal cation on number and strength of Lewis and Brønsted acid sites was studied by infrared spectroscopy in vacuum with the adsorption of probe molecule (deuterated acetonitrile). The number of various types of acid sites was calculated from the integrated curves after deconvolution of spectra of adsorbed D3-acetonitrile, while their strength is determined after heating at 150, 200 and 300 °C. Catalytic tests of methanol to olefine conversion (MTO) were preformed on selected samples.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:540133
Promotion2023
Study programmeTitle: Doctoral study in chemistry
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija (doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija)
Type of resourceText
Extent89 str. ; 30 cm
File originBorn digital
Access conditionsEmbargoed access
Embargo expiration date: 2025-03-10
Terms of useLicence In copyright icon
Created on2023-03-28 13:17:17