c-Axis-oriented HZSM-5 zeolites were directly synthesized by introducing crosslinked polyacrylamide (C-PAM) hydrogels into ZSM-5 synthesis gels. The growth orientation of the crystals as well as the acidity of ZSM-5 could be modulated by the C-PAM content in the synthesis gel. The crystal growth along the a-axis and b-axis was obviously restricted, whereas c-axis growth was distinctly promoted with increasing C-PAM content, which was probably due to the C-PAM having stronger interactions with the {010} and {100} facets than the {101} facet. Sample Z-2, which was prepared with 2% C-PAM exhibited the shortest b-axis length elongated prism structure and strong acid sites. Furthermore, Z-2 exhibited excellent catalytic performance in the methanol-to-olefin (MTO) reaction showing the highest methanol conversion (100%) and the light olefin selectivity (TOS) (81.2%), as well as the longest lifetime (>23 h).

通过将交联聚丙烯酰胺（C-PAM）水凝胶引入ZSM-5合成凝胶中，可以直接合成c轴取向的HZSM-5沸石。晶体的生长方向以及ZSM-5的酸度可以通过合成凝胶中C-PAM的含量来调节。沿a轴和b轴的晶体生长受到明显限制，而c轴的生长则随着C-PAM含量的增加而明显促进，这可能是由于C-PAM与{010}和{比{101}方面多100个方面。用2％C-PAM制备的样品Z-2表现出最短的b轴长的棱柱结构和强酸位。此外，Z-2在甲醇制烯烃（MTO）反应中表现出出色的催化性能，显示出最高的甲醇转化率（100％）和轻质烯烃选择性（TOS）（81.2％），以及最长的使用寿命（> 23小时）。