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.
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,