School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800 USM, Malaysia.
Department of Chemistry, Universitas Pendidikan Indonesia, Setiabudi 229, Bandung 40154, West Java, Indonesia.
Molecules. 2021 Apr 13;26(8):2238. doi: 10.3390/molecules26082238.
Offretite zeolite synthesis in the presence of cetyltrimethylammonium bromide (CTABr) is reported. The offretite crystals were synthesized with a high crystallinity and hexagonal prismatic shape after only 72 h of hydrothermal treatment at 180 °C. The CTABr has dual-functions during the crystallization of offretite, viz. as structure-directing agent and as mesoporogen. The resulting offretite crystals, with a Si/Al ratio of 4.1, possess more acid sites than the conventional offretite due to their high crystallinity and hierarchical structure. The synthesized offretite is also more reactive than its conventional counterpart in the acylation of 2-methylfuran for biofuel production under non-microwave 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.
本文报道了在十六烷基三甲基溴化铵（CTABr）存在下的 OFFRETITE 沸石合成。在 180°C 的水热条件下仅处理 72 小时，即可得到具有高结晶度和六方棱柱形状的 OFFRETITE 晶体。在 OFFRETITE 的结晶过程中，CTABr 具有双重功能，即作为结构导向剂和中孔生成剂。由于具有较高的结晶度和分级结构，Si/Al 比为 4.1 的合成 OFFRETITE 沸石具有比传统 OFFRETITE 沸石更多的酸位。在非微波瞬时加热条件下，用于生物燃料生产的 2-甲基呋喃的酰化反应中，所合成的 OFFRETITE 比其传统对应物更具反应性，在 83.5%的转化率下，目标产物 2-乙酰-5-甲基呋喃的选择性达到 100%。因此，这种两亲合成方法为需要昂贵有机模板的沸石材料的结晶提供了另一种具有成本效益的替代途径。
