添加氯化钠合成多级孔纳米ZSM-5分子筛及其MTP催化性能  

Synthesis of Nano-sized Hierarchical ZSM-5 Zeolites with NaCl Addition and Their MTP Catalysis Properties

作　　者：张洪菡 张善鹤 李春义[1] ZHANG Honghan;ZHANG Shanhe;LI Chunyi(State Key Laboratory of Heavy Oil Processing,China University of Petroleum (East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,山东青岛266580

出　　处：《青岛科技大学学报（自然科学版）》2019年第1期38-43,共6页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家重点基础研究发展规划项目(2012CB215006)

摘　　要：极浓体系下,通过添加NaCl水热合成了一系列多级孔纳米ZSM-5分子筛。所得分子筛通过X射线衍射仪(XRD)、低温氮气吸附仪、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和傅里叶红外光谱仪(FT-IR)表征。结果表明:NaX能使纳米晶相互聚集,形成多级孔结构,其中NaCl实用性最强;n(NaCl)/n(SiO_2)=0.1/1时,分子筛具有最大的比表面积和介孔量;晶化时间为8h,可得到纯相高结晶度的ZSM-5分子筛。将一定条件下制备的多级孔纳米NaCl-ZSM-5催化剂用于MTP(甲醇制丙烯)反应中,和常规多级孔纳米ZSM-5催化剂相比,NaCl-ZSM-5具有更好的稳定性(1 250min)和更高的丙烯碳基收率(质量分数36.5%)。In extremely concentrated system,a series of hierarchical nano-sized ZSM-5 zeolites were synthesized with the addition of NaCl.The obtained samples were characterized by XRD,N 2 adsorption-desorption,SEM,TEM andPy-FTIR.The results showed that the addition of NaXwas crucial to the formation of nano-sized aggregates,and NaCl had the optimal practicability;the as-synthesized zeolites hadthelarger surface area and mesopore volume when n(NaCl)/n(SiO 2)=0.1/1.The high crystallinity ZSM-5 zeolites were obtained when the time was 8 h.Compared with normal ZSM-5 catalysts,the as-synthesized ZSM-5 catalysts had enhanced stability(1 250 min)and propylene yield(36.5%)in MTP reaction.

关 键 词：NACL ZSM-5 纳米 多级孔 MTP 

分 类 号：O611.4[理学—无机化学]