To solve the easy deactivation of zeolite catalyst in methanol to propylene (MTP) reaction, hierarchical ZSM-11 zeolite composed of loosely aggregating ultra-small nanocrystals (∼10 nm) were prepared using vinyltrimethoxysilane-methyl methacrylate (VTMS-MMA) copolymer latex as a “bond blocker”. The structure and texture properties of the as-synthesized zeolite were systematically characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N adsorption desorption, NH-TPD, and thermogravimetric analysis (TG). The results showed that as compared with the parent ZSM-11-0 without adding the latex, the hierarchically porous ZSM-11- (1 ≤ ≤ 3) zeolite synthesized with VTMS-MMA copolymer latex had a higher surface area, mesopore volume, and moderate acidity. Due to the nanocrystallization of the primary grain in the polycrystalline aggregates, the micropores channels in the as-synthesized ZSM-11- (1 ≤ ≤ 3) were effectively shortened and abundant intercrystalline mesopores resulted from loosely aggregating of the ultrasmall primary crystals were therefore introduced, which offered the optimized ZSM-11-1 catalysts with a longer catalyst life (46 h) and a higher propylene yield (∼40.5 %) in MTP.

中文翻译：

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多级孔ZSM-11的合成及其甲醇制丙烯催化性能


为了解决甲醇制丙烯（MTP）反应中沸石催化剂容易失活的问题，以乙烯基三甲氧基硅烷-甲基丙烯酸甲酯（VTMS-MMA）共聚物乳液为原料，制备了由松散聚集的超小纳米晶体（~10 nm）组成的多级孔ZSM-11沸石。 “债券阻滞剂”。使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、N 吸附脱附、NH-TPD 和热重分析 (TG) 系统地表征了合成沸石的结构和织构性质。 ）。结果表明，与未添加乳液的母体ZSM-11-0相比，采用VTMS-MMA共聚物乳液合成的分级孔ZSM-11-（1≤≤3）沸石具有更高的比表面积、介孔体积和酸度适中。由于多晶聚集体中初生晶粒的纳米化，所合成的ZSM-11-（1≤≤3）中的微孔通道被有效缩短，并因此引入了由超小初晶松散聚集而产生的丰富的晶间介孔。 ，它提供了优化的 ZSM-11-1 催化剂，在 MTP 中具有更长的催化剂寿命（46 小时）和更高的丙烯收率（∼40.5%）。