摘要
在纳米mordenite(MOR)分子筛的制备基础上,以十六烷基三甲基溴化铵(CTAB)为介孔模板剂,一步水热晶化合成了具有微-介孔结构的纳米梯级孔MOR分子筛,考察了合成条件对MOR分子筛晶粒尺寸和孔结构的影响以及Pt/MOR催化剂催化异丙苯脱烷基的性能。结果表明:在晶化温度130℃,晶化时间48 h,水硅比18,碱硅比0.36和转速20 r/min条件下,制备的MOR分子筛晶粒大小约为30.0 nm;在合成体系中引入适量的CTAB可获得纳米梯级孔MOR分子筛,与纳米MOR分子筛相比,其具有较高的介孔面积和介孔体积以及适宜的酸量与酸强度。以纳米梯级孔MOR分子筛为载体制得的Pt/MOR催化剂显示出优异的加氢脱烷基性能。
Basedon the preparation of nano-MOR zeolites firstly, nano-hierarchical pore MOR zeolites were obtained by the one-step hydrothermal crystallization method with cetyl trimethyl ammonium bromide (CTAB) as a mesoporous template. The effects of the preparation conditions on the particle size and pore structure of the MOR zeolites were examined, and the catalytic performance of Pt/MOR zeolite catalysts for cumene hydrodealkylation was also examined. The results showed that the MOR zeolites with particle size of about 30.0 nm were obtained under the conditions of crystallization temperature 130℃, crystallization time 48 h, molar ratio of H2O to Si 18, molar ratio of NaOH to Si 0.36 and rotating speed 20 r/min, and the nano-hierarchical pore MOR zeolites were obtained by introducing suitable amount of CTAB into the synthesis system. Compared with the nano-MOR zeolites, the latter possessed higher mesoporous area, higher mesoporous volume, suitable acid amount and acid strength. The Pt catalyst supported on the nano-hierarchical pore MOR zeolites exhibited excellent hydrodealkylation performance due to the increasing of mesoporous volume and the decreasing of molecular diffusion resistance.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2015年第4期367-372,共6页
Chemical Reaction Engineering and Technology
关键词
纳米MOR分子筛
梯级孔
加氢脱烷基
水热晶化法
nano-MOR zeolite
hierarchical pore
hydrodealkylation
hydrothermal crystallization method
