Naslov
The Role of Preparation Way of Zeolite Beta Crystals on Their Acid Places Content

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

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

Izvornik
4th EAZC Book of Summaries / - , 2019

Skup
4th Euro Asia Zeolite Conference (EAZC)

Mjesto i datum
Taormina, Italija, 27.01.2019. - 30.01.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
mesoporous beta ; wet impregnation ; zeolite ; postsynthesis treatment ; acid sites

Sažetak
Since the intracrystalline diffusion of the reactants and products within zeolite catalyst (microporous crystals of micrometer size) is slow, the limitations of their efficiency should be avoided adding mesoporous voids (channels, holes). Introduction of mesoporous voids (hierarchical structure of the crystals) can be obtained using additional mesoporous template (e.g. CTAB) during catalyst synthesis, or by postsynthesis treatment of classically synthesized microcrystals (dealumination and desilication using e.g. NH4F or NaOH solutions). Another important issue in catalysis efficiency (we study methanol-to- olefine conversion – MTO) is number of active places (i.e. Lewis and Brönsteadt acid places). Its number can be increased with number of hetero T-atoms within framework. Beside direct synthesis of catalyst (zeolite Beta) of larger Al content, postsynthesis treatment (wet impregnation) can be used. After treatment, results show significant increase of number of both types of acid sites.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne prirodne znanosti, Kemijsko inženjerstvo

POVEZANOST RADA