Sinteza in karakterizacija cinkovega imidazolatnega ogrodja ZIF-8

Zamljen, Aleksandra (avtor), Meden, Anton (mentor)

V današnjem času, ko se še posebej osredotočamo na skrb za okolje, je ključno, da namesto fosilnih goriv poskušamo uveljaviti nove vire energije. Vodik je ena boljših alternativ, predvsem zaradi svoje čistosti in visoke količine energije na maso energenta. Poleg samega pridobivanja, je ena večjih težav tudi shranjevanje vodika in njegovo sproščanje pri standardni temperaturi in tlaku, saj shranjevanje vodika pod visokim tlakom ali utekočinjen vodik nista ekonomsko ugodni rešitvi. Rezervoarji so v teh primerih pod visokim tlakom, zato takšni načini shranjevanja predstavljajo tudi veliko nevarnost. V diplomskem delu sem sintetizirala porozno kovinsko-organsko ogrodje cinkov 2 metilimidazolat (ZIF-8), ki ima potencial za shranjevanje vodika. Želela sem najti optimalno sintezno pot za pripravo te spojine. S sintezo v vodni raztopini, evtektično metodo, sintezo v vodni raztopini v prisotnosti TEA in sintezo v metanolu sem poskušala pridobiti enak produkt, pri čemer sem kot izhodne spojine uporabila 2 metilimidazol in cinkov nitrat heksahidrat ali cinkov acetat dihidrat. Produkte sem analizirala z rentgensko praškovno difrakcijo in FTIR spektroskopijo in tako dobila potrditev, da so bili vsi nastali produkti različnih sinteznih poti spojina ZIF-8. Produkti različnih sintez se v strukturi bistveno niso razlikovali, torej organska topila za sintezo lahko zamenjamo tudi z vodno raztopino.

• Jezik: Slovenski jezik
• Ključne besede: ZIF-8 (angl. zeolitic imidazolate framework-8), mikroporozna ogrodja, zeolitska imidazolatna ogrodja, shranjevanje vodika
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Leto izida: 2020
• PID: 20.500.12556/RUL-119095
• COBISS.SI-ID: 27523587
• Datum objave v RUL: 03.09.2020

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Synthesis and characterization of zinc imidazolate framework ZIF-8

Izvleček

Nowadays, environmental sustainability is of the utmost importance, therefore, it is crucial to use renewable sources of energy rather than fossil fuels. Hydrogen holds great promise as a zero-emission fuel, due to the highest energy density per unit mass. Along with the production, one of the major drawbacks, however, is a lack of effective hydrogen storage solutions at standard pressure and temperature as pressurized and liquid hydrogen are not considered as economically viable options for storage. Furthermore, reservoirs are, in these cases, under high pressure, which is also extremely dangerous. The aim of this work was to determine the most favourable synthetic pathway for porous metal-organic framework zinc 2 methylimidazolate (ZIF-8), which is a promising material for hydrogen storage. The synthesis of a zinc 2-methylimidazolate in an aqueous solution, with deep eutectic method, the synthesis in an aqueous solution in the presence of TEA and preparation in methanol were implemented. 2-methylimidazole and zinc nitrate hexahydrate or zinc acetate dihydrate were used as the reactants. X-ray powder diffraction and FTIR spectroscopy were also carried out in order to characterize all products. Both analysis confirmed that products of different synthetic pathways were the compound ZIF 8. Products did not differ significantly in their structure, which indicates water solutions can be used as an alternative to organic solvents.

• Ključne besede: ZIF-8 (zeolitic imidazolate framework-8), microporous frameworks, zeolitic imidazolate frameworks, hydrogen storage