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首页> 外文期刊>RSC Advances >F-assisted synthesis of a hierarchical ZSM-5 zeolite for methanol to propylene reaction: a b-oriented thinner dimensional morphology
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F-assisted synthesis of a hierarchical ZSM-5 zeolite for methanol to propylene reaction: a b-oriented thinner dimensional morphology

机译：甲醇辅助丙烯反应的Z分子筛ZSM-5分子筛的F辅助合成：b取向的较薄尺寸形态

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摘要

Under neutral fluoride medium at 373 K, a facile strategy has been developed to synthesise a hierarchical ZSM-5 zeolite (M-ZSM-5) using a solid silica source in a dense system. The resulting material shows a hexagonal lamellar shape with b-oriented thinner dimension and bi-modal porosity containing MFI micropores and intracrystal mesopores. The effect of synthesis factors, such as NH4F/SiO2, H2O/SiO2, crystallization temperature and time, on the zeolite morphology and size is studied and its primary crystallization process is proposed. Through varying the synthesis parameters, the crystal size could be tuned with the aspect ratio at a range of 6.2-12. Typically, M-ZSM-5 with a thinner thickness (100 nm) and a high aspect ratio (AR = 12) shows a highly effective catalytic performance in methanol to propylene (MTP) reaction. Compared to the bulk C-ZSM-5 sample obtained from a hydroxyl system, M-ZSM-5 shows higher selectivity for propylene (45.1% vs. 38.1%) and butylene (27.2% vs. 21.3%), especially prolonged catalytic lifetime (224 h vs. 98 h). This enhanced performance could be contributed to the optimized acidity and superior diffusivity of M-ZSM-5 with lamellar morphology and bimodal porosity, which are crucial for suppressing secondary reactions and inhibiting coke deposition.
机译：在373 K的中性氟化物介质下，已经开发了一种简便的策略，可以在致密系统中使用固态二氧化硅源合成分层的ZSM-5沸石（M-ZSM-5）。所得材料显示出具有b取向的较薄尺寸和双峰孔隙的六边形层状形状，其包含MFI微孔和晶体内中孔。研究了NH4F / SiO2，H2O / SiO2，晶化温度和时间等合成因素对沸石形态和尺寸的影响，并提出了其初晶过程。通过改变合成参数，可以用纵横比在6.2-12范围内调节晶体尺寸。通常，具有更薄厚度（100 nm）和高纵横比（AR = 12）的M-ZSM-5在甲醇与丙烯（MTP）反应中显示出非常有效的催化性能。与从羟基体系中获得的大量C-ZSM-5样品相比，M-ZSM-5对丙烯（45.1％对38.1％）和丁烯（27.2％对21.3％）的选择性更高，尤其是延长了催化寿命（ 224小时与98小时）。这种增强的性能可能有助于优化M-ZSM-5具有层状形态和双峰孔隙率的酸度和优异的扩散性，这对于抑制次级反应和抑制焦炭沉积至关重要。

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