Synthesis of ZSM-5 catalysts with tunable mesoporosity by ultrasound-assisted method: A highly stable catalyst for methanol to propylene
Synthesis of ZSM-5 catalysts with tunable mesoporosity by ultrasound-assisted method: A highly stable catalyst for methanol to propylene
复制标题
超声辅助法合成介孔可调的ZSM-5催化剂：一种高度稳定的甲醇制丙烯催化剂
DOI：
10.1016/j.catcom.2018.06.001
复制
发表时间：
2018-08-01
影响因子：
3.7
通讯作者：
Xu, Hualong
中科院分区：
文献类型：
--
作者：
Zhuang, Sishuang;Hu, Zhijie;Xu, Hualong
利用一种简便的超声辅助方法合成了一系列介孔可调的ZSM-5分子筛。X射线衍射、傅里叶变换红外光谱和NH3-TPD结果表明，合成的ZSM-5分子筛在保持原有酸性的同时，仍保持了MFI结构。透射电子显微镜观察发现，超声处理通过破坏弱键，显著影响了晶化过程，特别是初始无定形凝胶的状态，从而导致晶体中介孔的形成。富含中孔的ZSM-5催化剂对结焦有明显的抑制作用，对甲醇制丙烯反应表现出较高的催化稳定性。当空速为4.0h(-1)时，Z5-US-60催化剂对>；600h表现出最高的催化稳定性。
A series of ZSM-5 zeolites with tunable mesoporosity were synthesized by a facile ultrasound-assisted method. XRD, FT-IR and NH3-TPD results exhibited that as-synthesized ZSM-5 kept the MFI structure as well as the original acidity. Traced by TEM techniques, the crystallization process, especially the state of initial amorphous gel, was found notably affected by the ultrasound treatment by breaking the weak bonds, which led to formation of mesopores in crystals. The ZSM-5 catalysts with abundant mesoprores inhibited coking significantly and showed high catalytic stability for methanol to propylene reaction. The Z5-us-60 catalyst exhibited the highest catalytic stability for > 600 h at a high WHSV of 4.0 h(-1).