Aromatization of iso-butanol with CO2 as an enhancer over ZSM-5 catalysts

Isobutanol was converted to aromatic compounds, such as BTX and C9 aromatics, over Ga or Zn impregnated ZSM-5 catalysts. The mechanism for aromatization includes dehydration, oligomerization, dehydrogenation, cyclization, and cycloaromatization according to referenced literature. Among these process...

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Bibliographic Details
Published in:Research on chemical intermediates 2017-12, Vol.43 (12), p.7223-7239
Main Authors: Mo, Yong-Hwan, Choi, Young-Ju, Choi, Hyejung, Park, Sang-Eon
Format: Article
Language:English
Subjects:
Aromatic compounds
Butanol
Carbon dioxide
Catalysis
Catalysts
Chemistry
Chemistry and Materials Science
Dehydration
Dehydrogenation
Gallium compounds
Hydrogen storage
Infrared radiation
Inorganic Chemistry
Isobutanol
Oligomerization
Physical Chemistry
Shift reaction
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Summary:Isobutanol was converted to aromatic compounds, such as BTX and C9 aromatics, over Ga or Zn impregnated ZSM-5 catalysts. The mechanism for aromatization includes dehydration, oligomerization, dehydrogenation, cyclization, and cycloaromatization according to referenced literature. Among these processes, dehydrogenation appeared to be the biggest hurdle to overcome; CO 2 was expected to be consumed by removing hydrogen, facilitating formation of aromatic species via a reverse water-gas shift reaction (RWGS) of CO 2 and hydrogen. The aromatization reaction was performed over H-ZSM-5, Zn-ZSM-5, and Ga-ZSM-5 catalysts under a He and CO 2 stream, and enhancements to the yields of aromatics were observed when CO 2 was flowed over the catalysts. Additional CO formed when the olefin/paraffin ratio increased as CO 2 consumed H 2 , and this was also confirmed in the RWGS reaction. The biggest CO 2 effect occurred over Ga-ZSM-5, and CO 2 appeared to interact favorably with the Ga species on ZSM-5 according to XPS and ex situ FT-IR analysis. Thus, it was observed that CO 2 served as a hydrogen scavenger and played a large role in enhancing the yields of aromatics.
ISSN:0922-6168
1568-5675
DOI:10.1007/s11164-017-3070-9