ZSM-5分子筛制备及其催化正己烷芳构化的反应性能
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摘要
采用原位水热晶化法制备出S-ZSM-5分子筛,利用X射线衍射仪、氨气程序升温脱附法、氮气吸附法等测定方法分析了其物相结构,并在连续固定床反应装置上,于反应温度为400℃,质量空速为1 h~(-1),N_2压力为0.5 MPa的条件下,评价了S-ZSM-5分子筛催化正己烷芳构化的反应性能。结果表明:S-ZSM-5分子筛比表面积为385 m~2/g,孔体积为0.54 cm~3/g,具有一定的介孔结构;与工业用相同硅铝比W-ZSM-5分子筛相比,S-ZSM-5分子筛具有ZSM-5分子筛特征衍射峰,并且衍射峰较强,结晶度较高,具有强酸和弱酸,且酸量和酸强度适宜,分子筛晶型较为规则;S-ZSM-5分子筛催化剂催化正己烷芳构化反应,正己烷转化率约为98.00%,芳烃选择性基本维持在约70.00%。
The S-ZSM-5 zeolite was prepared by in-situ crystallization synthesis method, and the phase structure was analyzed by X-ray diffraction(XRD), Brunauer, Emmett and Teller(BET), NH_3-temperature-programmed desorption(NH_3-TPD) and scanning electron microscope(SEM) etc, the reaction performances of n-hexane catalyzed by S-ZSM-5 zeolite in the continuous fixed-bed under the conditions of reaction temperature 400 ℃, mass space velocity 1 h~(-1),pressure 0.5 MPa(N_2).The results showed that the ZSM-5 zeolite had the some mesoporous structures with the specific surface area of 385 m~2/g, pore volume of 0.54 m~3/g; compared with W-ZSM-5 zeolite(same Si/Al for industrial use), S-ZSM-5 zeolite had strong characteristic diffraction peaks of ZSM-5 with higher crystallinity, moderate acid amount and acid strength. and regular crystalline structure; in the aromatization reaction of ZSM-5 zeolite, the conversion of n-hexane was 98.00%,and the aromatization selectivity was holding at 70.00% basically.
The S-ZSM-5 zeolite was prepared by in-situ crystallization synthesis method, and the phase structure was analyzed by X-ray diffraction(XRD), Brunauer, Emmett and Teller(BET), NH_3-temperature-programmed desorption(NH_3-TPD) and scanning electron microscope(SEM) etc, the reaction performances of n-hexane catalyzed by S-ZSM-5 zeolite in the continuous fixed-bed under the conditions of reaction temperature 400 ℃, mass space velocity 1 h~(-1),pressure 0.5 MPa(N_2).The results showed that the ZSM-5 zeolite had the some mesoporous structures with the specific surface area of 385 m~2/g, pore volume of 0.54 m~3/g; compared with W-ZSM-5 zeolite(same Si/Al for industrial use), S-ZSM-5 zeolite had strong characteristic diffraction peaks of ZSM-5 with higher crystallinity, moderate acid amount and acid strength. and regular crystalline structure; in the aromatization reaction of ZSM-5 zeolite, the conversion of n-hexane was 98.00%,and the aromatization selectivity was holding at 70.00% basically.
引文
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[3]祁燕龙,刘振英, 简书基, 等. 我国对二甲苯产能和市场分析[J]. 河南化工, 2015, 32(4):7-9.
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[5]任浩楠, 李剑, 杨丽娜. 改性ZSM-5甲醇芳构化催化剂研究进展[J].天然气化工(C1化学与化工), 2015,40(3):83-87.
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