Two-stage glucose-assisted crystallization of ZSM-5 to improve methanol to propylene (MTP)
Two-stage glucose-assisted crystallization of ZSM-5 to improve methanol to propylene (MTP)
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DOI：
10.1016/j.micromeso.2018.05.003
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发表时间：
2018-11-01
影响因子：
5.2
通讯作者：
Rood, Mark J.
中科院分区：
文献类型：
--
作者：
Feng, Rui;Wang, Xixi;Rood, Mark J.
提高ZSM-5催化剂的寿命和丙烯选择性对甲醇制丙烯（MTP）反应具有重要意义。以葡萄糖为第二模板剂，采用两步晶化法合成了分级ZSM-5分子筛。采用低温N2吸附、XRD、Al-27和Si-29 NMR、吡啶探针FTIR、NH3-TPD、SEM和TEM等手段对样品的结构、表面性质和形貌进行了表征。与常规的一段结晶ZSM-5相比，两段葡萄糖辅助结晶ZSM-5沸石显示出大的棱柱形晶粒，增加了晶内介孔，并且降低了酸量和酸强度。在450 ℃、甲醇WHSV为3.8 h（-1）的甲醇制丙烯（MTP）反应中，新制备的ZSM-5催化剂如ZSM-5-T3表现出最高的丙烯选择性（45.2%）、丙烯/乙烯比（8.4）和C-2（-）中心点C-4（-）选择性（63.9%）。
Improving propylene selectivity and the lifetime of ZSM-5 catalyst is of great significance for methanol to propylene (MTP) reaction. Hierarchical ZSM-5 zeolites were synthesized by a two-stage crystallization method using glucose as a second template. The structural and surface properties and the morphologies of the prepared samples were characterized by low-temperature N-2 sorption, XRD, Al-27 and Si-29 NMR, FTIR using pyridine probe molecule, NH3-TPD, SEM, and TEM analysis. The two-stage glucose-assisted crystallized ZSM-5 zeolites exhibited large prismatic crystallites, increased intracrystalline mesopores, and reduced acid amount and acid strength, compared with the conventional one-stage crystallized ZSM-5. Methanol to propylene (MTP) reaction at 450 degrees C and methanol WHSV of 3.8 h(-1) revealed that the newly prepared ZSM-5 catalyst, such as ZSM-5-T3, exhibited highest propylene selectivity of 45.2%, propylene to ethylene ratio of 8.4, and C-2(-)center dot C-4(-) selectivity of 63.9%.