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- Lee, Jae Sung
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The effect of pre-coking and regeneration on the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene
- Alternative Title
- The effect of pre-coking and regeneration on the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene
- Author(s)
- Kim, Yeon Ho, Lee, Kyung Hee, Lee, Jae Sung
- Issued Date
- 2011-12
- Citation
- CATALYSIS TODAY, v.178, no.1, pp.72 - 78
- Abstract
- A new method to modify the acidity of zeolite was attempted to improve the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene. Pre-coking and regeneration in the presence of O(2) at 773 K generated a large exothermic heat in a short time, which resulted in the thermal dealumination of framework aluminum that acted as a Bronsted acid site. The treatment had a profound effect on the acid properties of the catalyst as probed by (27)Al MAS NMR, temperature-programmed desorption of ammonia, and pyridine FTIR. The results showed that the concentration of oxygen in regeneration step had critical effects on the acidity and stability of Zn/ZSM-5. Thus improvement of lifetime of Zn/ZSM-5 in aromatization of 2-methyl-2-butene was achieved without deteriorating activity and selectivity by the pre-coking and controlled regeneration by oxygen. (C) 2011 Elsevier B. V. All rights reserved
- Publisher
- ELSEVIER SCIENCE BV
- ISSN
- 0920-5861
- Keyword (Author)
- Aromatization, 2-Methyl-2-butene, Dealumination, Acidity, Zn/ZSM-5
- Keyword
- ZEOLITE CATALYSTS, XYLENE ISOMERIZATION, ACIDITY, ALKANES, HZSM-5, HYDROCARBONS, IMPROVEMENT, H-ZSM-5, PROPANE, OLEFINS
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