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A green and cost-effective surfactant-assisted synthesis of SAPO-34 using dual microporous templates with improved performance in MTO reaction
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2020-05-29 , DOI: 10.1007/s10971-020-05308-w
Sahar Akhgar , Jafar Towfighi , Marzieh Hamidzadeh

The SAPO-34 catalysts were successfully synthesized with different amounts of a cheap and green nonionic surfactant (Triton X-100) as a mesoporogen additive and MOR/TEAOH as microporous mixed templates. The prepared samples were characterized and tested in the methanol to olefins (MTO) reaction under the industrial feed composition of 72 wt% methanol in water. The results revealed that the surfactant concentration affects the acidity, particle size, and textural properties which results in different catalytic performances. The sample prepared with the surfactant molar ratio of 0.02 exhibits a 12% improvement in the light olefins selectivity (90%) as well as the longer catalyst lifetime (more than 330 min) compared to the parent one (79.3% selectivity and 260 min lifetime). This could be attributed to the high crystallinity, smaller crystallite size, proper lower acidity, higher surface area, and the facilitation of reactants and product transportation through mesoporosity created in the structure of crystals.

Hierarchical SAPO-34 molecular sieve was synthesized with different amounts of triton X-100 (0, 0.02, 0.04, and 0.06) as a green and cost-effective surfactant. The catalytic performance of samples carried out under industrial feed composition (72 wt% MeOH in water). The SP-34 (0.02) sample prepared with 0.02 molar ratio of triton X-100/Al2O3 showed the best performance among all the catalysts (90% total light olefins and more than 330 min lifetime).



中文翻译:

使用具有改善的MTO反应性能的双重微孔模板,绿色环保且经济高效的表面活性剂辅助合成SAPO-34

SAPO-34催化剂已成功合成了不同数量的廉价和绿色非离子表面活性剂(Triton X-100)作为介孔原添加剂,而MOR / TEAOH作为微孔混合模板。在工业进料组成为72 wt%的水中,在甲醇制烯烃(MTO)反应中对制备的样品进行表征和测试。结果表明,表面活性剂浓度会影响酸度,粒径和质构性质,从而导致不同的催化性能。与母体一(79.3%的选择性和260分钟的寿命)相比,以表面活性剂摩尔比0.02制备的样品在轻烯烃的选择性(90%)方面提高了12%,并且催化剂寿命更长(超过330分钟)。 )。这可能归因于高结晶度,

合成了具有不同量的Triton X-100(0、0.02、0.04和0.06)的绿色和低成本的表面活性剂分级SAPO-34分子筛。样品的催化性能在工业进料组成下(水中72 wt%MeOH)进行。以0.02摩尔的triton X-100 / Al 2 O 3摩尔比制备的SP-34(0.02)样品在所有催化剂中表现出最佳性能(总轻烯烃含量为90%,使用寿命超过330分钟)。

更新日期:2020-06-26
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