Inorganic Chemicals Industry >

2024 , Vol. 56 >Issue 7: 55 - 60

DOI: https://doi.org/10.19964/j.issn.1006-4990.2023-0445

Research & Development

Study on effect of hydrothermal aging on physicochemical properties of propylene additives

  • ZHAO Mingzhi ,
  • DUAN Hongchang ,
  • SUN Xueqin ,
  • Lü Penggang ,
  • LI Xueli ,
  • LIU Tao ,
  • CAO Gengzhen
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  • 1.Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou 730060, China
    2.School of Chemistry and Chemical Engineering, Yan′an University, Yan′an 716000, China

Received date: 2023-09-06

  Online published: 2024-08-01

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Abstract

Using a fixed⁃bed aging device，the compounded propylene additives for increasing propylene production in catalytic cracking were subjected to 0，4，8，12 h and 24 h of hydrothermal aging under atmospheric pressure at a hydrothermal aging temperature of 800 ℃ and 100% water vapor，respectively，and the aging additives were evaluated for their ACE responses using X-ray diffractometry，N2 adsorption-desorption and pyridine adsorption infrared spectroscopies for the characterization of the aging additives.The results showed that as the aging time increased from 0 h to 24 h，the increase in propylene production of the propylene additives was decreased from 7.15% for the fresh additives to 4.02% for the aged 24 h additives，the relative crystallinity was decreased from 20% to 15%，the microporous surface area was decreased from 57 m2/g to 32 m2/g，and the ratio of strong L-acid/total L-acid was decreased from 0.33 to 0.16.The study showed that with the extension of aging time，the relative crystallinity of additive ZSM-5 was decreased，the microporous specific surface area was decreased，and the ratio of strong L-acid/total L-acid was decreased rapidly，all of which indicated that the decrease in the propylene production enhancement performance of the propylene additives was mainly due to the structural damage of the active component，ZSM-5 molecular sieve，under the condition of high temperature and hydrothermal heat.

Key words： catalytic cracking; propylene additive; hydrothermal stability; aging time; ZSM-5

Cite this article

ZHAO Mingzhi , DUAN Hongchang , SUN Xueqin , Lü Penggang , LI Xueli , LIU Tao , CAO Gengzhen . Study on effect of hydrothermal aging on physicochemical properties of propylene additives[J]. Inorganic Chemicals Industry, 2024 , 56(7) : 55 -60 . DOI: 10.19964/j.issn.1006-4990.2023-0445

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