期刊
RESEARCH ON CHEMICAL INTERMEDIATES
卷 43, 期 12, 页码 7223-7239出版社
SPRINGER
DOI: 10.1007/s11164-017-3070-9
关键词
Isobutanol; CO2; ZSM-5; Aromatization; CO2 utilization; BTX
资金
- INHA UNIVERSITY Research Grant [53699]
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; CO2 was expected to be consumed by removing hydrogen, facilitating formation of aromatic species via a reverse water-gas shift reaction (RWGS) of CO2 and hydrogen. The aromatization reaction was performed over H-ZSM-5, Zn-ZSM-5, and Ga-ZSM-5 catalysts under a He and CO2 stream, and enhancements to the yields of aromatics were observed when CO2 was flowed over the catalysts. Additional CO formed when the olefin/paraffin ratio increased as CO2 consumed H-2, and this was also confirmed in the RWGS reaction. The biggest CO2 effect occurred over Ga-ZSM-5, and CO2 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 CO2 served as a hydrogen scavenger and played a large role in enhancing the yields of aromatics.
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