The effect of pre-coking and regeneration on the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene
SCIE
SCOPUS
- Title
- The effect of pre-coking and regeneration on the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene
- Authors
- Kim, YH; Lee, KH; Lee, JS
- Date Issued
- 2011-12-15
- Publisher
- ELSEVIER SCIENCE BV
- 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.
- Keywords
- Aromatization; 2-Methyl-2-butene; Dealumination; Acidity; Zn/ZSM-5; ZEOLITE CATALYSTS; XYLENE ISOMERIZATION; ACIDITY; ALKANES; HZSM-5; HYDROCARBONS; IMPROVEMENT; H-ZSM-5; PROPANE; OLEFINS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16501
- DOI
- 10.1016/J.CATTOD.2011.07.002
- ISSN
- 0920-5861
- Article Type
- Article
- Citation
- CATALYSIS TODAY, vol. 178, no. 1, page. 72 - 78, 2011-12-15
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