Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

doi:10.1016/j.cjche.2015.08.010

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (10): 1655-1661.DOI: 10.1016/j.cjche.2015.08.010

• 催化、动力学与反应工程 • 上一篇下一篇

Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

Guozhu Li^1,2, Zhenheng Diao¹, Jindan Na¹, Li Wang^1,2

1 Key Laboratory of Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China

收稿日期:2015-05-27 修回日期:2015-07-28 出版日期:2015-10-28 发布日期:2015-11-27
通讯作者: Li Wang
基金资助:
Supported by the National Natural Science Foundation of China (U1232134, 21306132) and the Doctoral Program of Higher Education (20120032120008).

Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

Guozhu Li^1,2, Zhenheng Diao¹, Jindan Na¹, Li Wang^1,2

1 Key Laboratory of Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China

Received:2015-05-27 Revised:2015-07-28 Online:2015-10-28 Published:2015-11-27
Supported by:
Supported by the National Natural Science Foundation of China (U1232134, 21306132) and the Doctoral Program of Higher Education (20120032120008).

摘要/Abstract

摘要： In this study, various ZSM-5/MCM-41 micro/mesoporous zeolite composites have been prepared by alkalidesilication and surfactant-directed recrystallization of ZSM-5. The effects of particle size and Si/Al ratio of initial ZSM-5 zeolites on the structure and catalytic performance of ZSM-5/MCM-41 composites are studied. The results of XRD, TEM N₂-adsorption-desorption, NH₃-TPD and in situ FT-IR revealed that ordered hexagonal MCM-41 mesopores with 3-4 nm pore size were formed around ZSM-5 crystals, and the specific surface area and mesopore volume of composites increased with increasing the Si/Al ratio of initial ZSM-5. Catalytic cracking of n-dodecane (550 ℃, 4 MPa) showed that the ZSM-5/MCM-41 composites obtained from the high Si/Al ratio and nano-sized initial ZSM-5 zeolites exhibited superior catalytic performance, with the improvement higher than 87% in the catalytic activities and 21% in the deactivation rate compared with untreated zeolites. This could be ascribed to their suitable pore structure, which enhanced the diffusion of reactant molecules in pores of catalysts.

关键词: ZSM-5/MCM-41, Zeolite, Desilication, Recrystallization, Catalytic cracking

Abstract: In this study, various ZSM-5/MCM-41 micro/mesoporous zeolite composites have been prepared by alkalidesilication and surfactant-directed recrystallization of ZSM-5. The effects of particle size and Si/Al ratio of initial ZSM-5 zeolites on the structure and catalytic performance of ZSM-5/MCM-41 composites are studied. The results of XRD, TEM N₂-adsorption-desorption, NH₃-TPD and in situ FT-IR revealed that ordered hexagonal MCM-41 mesopores with 3-4 nm pore size were formed around ZSM-5 crystals, and the specific surface area and mesopore volume of composites increased with increasing the Si/Al ratio of initial ZSM-5. Catalytic cracking of n-dodecane (550 ℃, 4 MPa) showed that the ZSM-5/MCM-41 composites obtained from the high Si/Al ratio and nano-sized initial ZSM-5 zeolites exhibited superior catalytic performance, with the improvement higher than 87% in the catalytic activities and 21% in the deactivation rate compared with untreated zeolites. This could be ascribed to their suitable pore structure, which enhanced the diffusion of reactant molecules in pores of catalysts.

Key words: ZSM-5/MCM-41, Zeolite, Desilication, Recrystallization, Catalytic cracking

Guozhu Li, Zhenheng Diao, Jindan Na, Li Wang. Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio[J]. Chinese Journal of Chemical Engineering, 2015, 23(10): 1655-1661.

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Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

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