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

Guozhu Li; Zhenheng Diao; Jindan Na; Li Wang

doi:10.1016/j.cjche.2015.08.010

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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

催化、动力学与反应工程 | Updated：2026-01-06

- Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio
- Chinese Journal of Chemical Engineering Vol. 23, Issue 10, Pages: 1655-1661(2015)
- Affiliations：
  
  2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University,Tianjin,China,300072
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2015.08.010
  CLC：
- Published：2015
- Accepted：
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-dodecane: Effect of initial particle size and Si/Al ratio[J]. Chinese Journal of Chemical Engineering, 2015, 23(10): 1655-1661.
DOI：

-dodecane: Effect of initial particle size and Si/Al ratio[J]. Chinese Journal of Chemical Engineering, 2015, 23(10): 1655-1661. DOI： 10.1016/j.cjche.2015.08.010.

摘要

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 N

-adsorption-desorption

-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.

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