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The hydrothermal stability of the alkali-treated ZSM-5 and it’s catalytic performance in catalytic cracking of VGO

  • Dongmin Han
  • Yanhong Chen
  • Chunyi Li
Original Paper

Abstract

To enhance the heavy oil cracking ability of ZSM-5, desilication by alkali has been adopted in this study. The results showed that desilication by NaOH, NaOH/Al(NO3)3, NaOH/(NH4)3PO4 solutions all can induce some mesoporous structure to ZSM-5 zeolite. Among them, the sample ZSM-5/NaOH/(NH4)3PO4-F showed the highest mesoporous surface area. The hydrothermal stability of the desilicated ZSM-5 samples was also measured. The NaOH-modified ZSM-5 sample exhibited worse hydrothermal stability than the parent ZSM-5, while NaOH/(NH4)3PO4 modified ZSM-5 sample maintained the higher relative crystallinity and more acidic sites than the parent ZSM-5 after the hydrothermal treatment. The micro-activity tests showed that the NaOH/Al(NO3)3, NaOH/(NH4)3PO4-modified ZSM-5 samples exhibited higher catalytic activity than the parent ZSM-5 sample and NaOH-modified ZSM-5 sample in catalytic cracking of vacuum gas oil (VGO). Especially, for the sample ZSM-5/NaOH/(NH4)3PO4, the conversion of VGO increased from 78.91 to 85.13%, and the yield of propylene increased from 15.01 to 18.83% compared to the unmodified ZSM-5 catalyst.

Keywords

Alkali-treated ZSM-5 Mesopores Acidity Hydrothermal stability Phosphorus Catalytic cracking 

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringShengli College China University of PetroleumDongyingChina
  2. 2.State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China)QingdaoChina

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