A Nanostrips-Assemble Morphology of ZSM-5 Zeolite for Efficient Propylene Production from Methanol Conversion,ACS Sustainable Chemistry & Engineering

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A Nanostrips-Assemble Morphology of ZSM-5 Zeolite for Efficient Propylene Production from Methanol Conversion
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-06-07 , DOI: 10.1021/acssuschemeng.3c00074
Shiqing Li _{1,

2} , Rusi Peng _{1,

2} , Zheng Wan ₁ , Yudan Gong ₁ , Xiaomeng Si ₃ , Jie Tuo ₁ , Hao Xu _{1,

4} , Jingang Jiang ₁ , Yejun Guan _{1,

4} , Yanhang Ma ₃ , Xiao He ₁ , Peng Wu _{1,

4}

Affiliation

Turning the morphology and orientated growth of zeolite crystals is essential to alter their catalytic performances. MFI-type ZSM-5 nanostripes (named as D-Z5) with a sea-urchin-like overall morphology were directly synthesized with a commercially available and small-molecular organic structure-directing agent (OSDA) of 1-butyl-1-methylpyrrolidinium hydroxide. Their nanostrip crystals exhibited a unique dioriented morphology with thin thicknesses of ∼8 nm and ∼70 nm along the a-axis and b-axis, respectively. The dealuminated D-Z5 displayed higher propylene selectivity (∼57%), longer lifetime (60 h) and much higher propylene-to-ethylene ratio (>12) in methanol-to-propylene (MTP) reaction than those conventional ZSM-5 with known crystal morphologies. Computational simulation and experimental measurements provided solid proof that the diorientated crystals decreased the bulky molecular diffusion resistance, postponed the secondary reaction and then promoted propylene to diffuse rapidly out of two sets of micropores in zeolites. This unusual diorientation phenomenon is not only beneficial for improving the MTP catalytic performance of ZSM-5, but also expected to be versatile to develop other useful zeolite catalysts.

中文翻译：

ZSM-5 沸石纳米带组装形态用于甲醇转化高效生产丙烯

改变沸石晶体的形态和定向生长对于改变其催化性能至关重要。采用市售小分子有机结构导向剂1-丁基-1-甲基吡咯烷鎓直接合成了具有海胆状整体形貌的MFI型ZSM-5纳米带（命名为D-Z5）氢氧化物。他们的纳米带晶体表现出独特的双取向形态，沿a轴和b轴的厚度约为 8 nm 和 70 nm分别为 - 轴。与传统的 ZSM-5 相比，脱铝 D-Z5 在甲醇制丙烯 (MTP) 反应中表现出更高的丙烯选择性 (∼57%)、更长的寿命 (60 h) 和更高的丙烯乙烯比 (>12)具有已知的晶体形态。计算模拟和实验测量有力地证明了双取向晶体降低了大分子扩散阻力，推迟了二次反应，从而促进丙烯从沸石的两组微孔中快速扩散出来。这种不寻常的双取向现象不仅有利于提高ZSM-5的MTP催化性能，而且有望广泛用于开发其他有用的沸石催化剂。

更新日期：2023-06-07

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