Naslov
Utjecaj načina sinteze na morfologiju kristala zeolita Beta
(The Influence of the Synthesis Pathway on the Morphology of Zeolite Beta Crystals)

Autori
Landripet, Ivana ; Puškarić, Andreas ; Bronić, Josip ;

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
26th HSKIKI Book of Abstracts / - , 2019, 211-211

Skup
26. hrvatski skup kemičara i kemijskih inženjera (26HSKIKI) ; 4. simpozij Vladimir Prelog

Mjesto i datum
Šibenik, Hrvatska, 09.04.2019. - 12.04.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
zeolite ; mesoporous beta ; morphology ; CTAB

Sažetak
The BEA framework topology attracts much attention because of the three‐dimensional large‐pore channel system, large available micropore volume, and the presence of active sites in different concentrations that are useful in a number of acid‐catalyzed reactions. Intracrystalline diffusion of the reactants and products within zeolite crystals is limited, and can be avoided reducing the size of the crystals to nanoscale or by introducing mesoporous voids. Efficiency of the catalytic process can be improved by increasing the number of active places (i.e. Lewis and Brønsted acid places). Samples of hierarchical zeolite beta was made by a feasible one‐pot (one‐step) method, which is suitable for application in industrial production. Introduction of mesoporous voids (hierarchical structure of the crystals) was obtained using additional mesoporous template (e.g. CTAB) during catalyst synthesis, or by postsynthesis treatment of classically synthesized microcrystals by dealumination/desilication. Crystalline size and morphology was adopted by the addition of ammonium fluoride. Fluoride ions have a structure‐directing role and induce formation of the nanosized crystals.The synthesis resulted in micro‐ and mesoporous zeolite beta (hierarchical structure) with micrometer and nanometer size crystals, what is confirmed using characterization by infrared spectroscopy, X‐ray powder diffraction, scanning electron microscopy, particle size analysis and infrared physisorption measurements.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

POVEZANOST RADA