ZSM-35沸石的合成及其催化裂解庚烷制烯烃  

Synthesis of ZSM-35 zeolites and catalytic cracking of n-heptane to olefin

作　　者：张晓丹 张永军 韩洪晶[1] 张亚男 王海英[1] 张加羽 刘心雨 陈彦广[1] Zhang Xiaodan;Zhang Yongjun;Han Hongjing;Zhang Yanan;Wang Haiying;Zhang Jiayu;Liu Xinyu;Chen Yanguang(College of Chemistry&Chemical Engineering,Northeast Petroleum University,Daqing 163318,China;Daqing Petrochemical Research Center,PetroChina Petrochemical Research Institute,Daqing 163000,China)

机构地区：[1]东北石油大学化学化工学院,黑龙江大庆163318 [2]中国石油石油化工研究院大庆化工研究中心,黑龙江大庆163714

出　　处：《炼油与化工》2024年第5期7-13,共7页Refining And Chemical Industry

基　　金：中国石油科技创新基金项目(2021DQ02-0701)。

摘　　要：利用烷烃催化裂解制备轻烯烃的研究已取得显著进展,而提高轻烯烃产率和选择性仍然存在挑战。文中采用水热合成方法以吡咯烷(PYR)和十六烷基三甲基溴化铵(CTAB)为双模板剂制备了具有层状薄片堆叠构成的球形ZSM-35-0.01CTAB分子筛。通过PYR和CTAB的相互作用,相对于母体ZSM-35催化剂,ZSM-35-0.01CTAB比表面积和孔体积分别由309 m^(2)/g和0.19 m^(3)/g升至340 m^(2)/g和0.24 m^(3)/g。在正庚烷催化裂解过程中,相比于ZSM-35的27.68%和ZSM-35-0.005CTAB的32.19%,有促进中间体的传质,将C_(2)^(=)~C_(4)^(=)产率提升至37.05%。新的合成策略为调节ZSM-35沸石的形貌和尺寸提供了有效途径,并在烷烃裂解过程中提供了新的理论指导。Catalytic cracking of alkanes to produce olefin has received extensive attention.However,the yield and selectivity of olefinremains a challenge.The spherical ZSM-35-0.01CTAB zeolites were prepared by hydrothermal synthesis using pyrrolidine(PYR)and cetyltrimethyl ammonium bromide(CTAB)as double templates in this paper.The specific surface area and pore volume of ZSM-35-0.01CTAB zeolite increased from 309 m^(2)/g and 0.19 m^(3)/g to 340 m^(2)/g and 0.24 m^(3)/g,respectively.Due to the interaction between PYR and CTAB,which was conducive to the mass transfer of intermediates.Due to the interaction between PYR and CTAB,it was beneficial to the mass transfer of intermediates.The yield of C_(2)^(=)~C_(4)^(=)increased to 37.05%during the catalytic cracking of n-heptane compared to ZSM-35(27.68%)and ZSM-35-0.005CTAB(32.19%).This new synthesis strategy provided an effective way to adjust the morphology and size of ZSM-35 zeolite and a new theoretical guidance in the process of alkane cracking.

关 键 词：ZSM-35沸石 双模板剂 正庚烷 催化裂解 C_(2)^(=)~C_(4)^(=) 

分 类 号：TQ426.94[化学工程]