Comparative Research on the Supercritical Catalytic Cracking of n-Dodecane and Kerosene Using Nanosheet MFI Zeolite

doi:10.7652/xjtuxb201711008

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Comparative Research on the Supercritical Catalytic Cracking of n-Dodecane and Kerosene Using Nanosheet MFI Zeolite

更新时间：2025-07-09

- Comparative Research on the Supercritical Catalytic Cracking of n-Dodecane and Kerosene Using Nanosheet MFI Zeolite
- Vol. 51, Issue 11, Pages: 51-56+62(2017)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201711008
  CLC： O643.32
- Online First：10 November 2017，
  
  Published：2017
- 稿件说明：
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Comparative Research on the Supercritical Catalytic Cracking of n-Dodecane and Kerosene Using Nanosheet MFI Zeolite[J]. 2017, 51(11): 51-56+62.
DOI：

Comparative Research on the Supercritical Catalytic Cracking of n-Dodecane and Kerosene Using Nanosheet MFI Zeolite[J]. 2017, 51(11): 51-56+62. DOI： 10.7652/xjtuxb201711008.

摘要

针对传统ZSM-5分子筛孔径小、反应物分子扩散路径长、催化活性稳定性较差等问题

通过水热法合成了具有更高催化活性及稳定性的纳米片型MFI分子筛(Nanosheet MFI

NS-MFI)

并通过XRD、BET、SEM、TEM和NH

-TPD表征

分别以正十二烷和煤油为超临界催化裂解底物

测试了NS-MFI的催化活性及稳定性

并与传统的ZSM-5分子筛进行比较。与ZSM-5分子筛相比

NS-MFI具有更高的比表面积、更大的孔容、更薄的片层结构。在裂解正十二烷时

NS-MFI催化裂解的产气率更高

低碳烯烃的选择性更高

产生的热沉值更大。裂解煤油时

在550 ℃时

由于煤油中含有大量的环烷烃

使其更难被裂解

两种分子筛催化裂解的活性相当; 在600 ℃时

NS-MFI具有比ZSM-5更高的催化活性。两种分子筛裂解煤油的活性均低于裂解正十二烷的活性

多级孔道结构及较薄的片层结构有利于反应物及产物的扩散

可提高催化剂的反应活性及稳定性。

Abstract

In order to overcome the low catalytic activity and stability of ZSM-5 zeolite due to its microporous and long diffusion path to the substrates and products

a nanosheet MFI(NS-MFI)zeolite with higher activity and stability was synthesized by hydrothermal method

and it was characterized by XRD

BET

SEM

TEM and NH

-TPD methods. The supercritical catalytic activity of NS-MFI zeolite was studied by cracking n-dodecane and kerosene

and the activity was compared with that of conventional ZSM-5 zeolite. Compared with ZSM-5

NS-MFI showed higher BET surface area

larger volume and ultrathin lamellar structure. During the cracking of n

-dodecane

the NS-MFI zeolite showed higher gas generation rate

selectivity of alkenes and heat sinks because of its special morphological structure; during the cracking of kerosene at 550 ℃

NS-MFI showed equivalent activity to ZSM-5 zeolite

because large amount of cycloalkanes exist in kerosene which is difficult to be cracked. While at 600 ℃

the NS-MFI zeolite showed better performance. However

the activities of kerosene cracking by the two zeolites were both lower than that of n-dodecane cracking. So

it can be concluded that porous and ultrathin lamellar structure is beneficial to the diffusion of reactants and products

and hence improving the catalytic activity and stability.

关键词

Keywords

references

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