Offretite zeolite single crystals crystallized using amphiphile-templating approach

Eng-Poh Ng (1) , Nur Hidayahni Ahmad (2) , Fitri Khoerunnisa (3) , Svetlana Mintova (4) , Tau Chuan Ling (5) , T. Jean Jean Daou (6)

1 USM - Universiti Sains Malaysia
2 University of Hail
3 Universitas Pendidikan Indonesia
4 LCS - Laboratoire catalyse et spectrochimie
5 UM - University of Malaya = Universiti Malaya [Kuala Lumpur, Malaisie]
6 IS2M - Institut de Science des Matériaux de Mulhouse

Offretite zeolite synthesis in the presence of cetyltrimethylammonium bromide (CTABr) is reported for the first time. The offretite crystals exhibited novel hexagonal prismatic shape with high crystallinity after only 72 h of hydrothermal treatment at 180 o C which is considerably faster than the already known synthesis procedure used for the preparation of offretite. The study showed that CTABr has dual-functions during crystallization of offretite, viz. as structure-directing agent and as mesoporogen. The resulting offretite crystals (Si/Al ratio = 4.1) possess more acid sites than the conventional offretite thanks to its high 2 crystallinity and hierarchical structure. The synthesized zeolite is also more reactive than its conventional counterpart in the acylation of 2-methylfuran for biofuel production under nonmicrowave instant heating condition, giving 83.5% conversion with 100% selectivity to the desired product 2-acetyl-5-methylfuran. Hence, this amphiphile synthesis approach offers another cost-effective and alternative route for crystallizing zeolite materials that require expensive organic templates.

Mots clés: Hierarchical zeolites; Crystal growth; Offretite zeolite; Amphiphile-templating approach; Acylation of 2-methylfuran

Domaines: Chimie

Eng-Poh Ng, Nur Hidayahni Ahmad, Fitri Khoerunnisa, Svetlana Mintova, Tau Chuan Ling, et al.. Offretite zeolite single crystals crystallized using amphiphile-templating approach. Molecules, 2021, 26 (8), pp.2238. ⟨10.3390/molecules26082238⟩. ⟨hal-03414931⟩