Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 235, Issue -, Pages 92-102Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.04.063
Keywords
Fischer-Tropsch synthesis; Gasoline selective; Structured catalyst; ZSM-5; Bifunctional catalyst
Funding
- American Chemical Society - Petroleum Research Fund [53648-DNI5]
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The need for energy independence and security has refocused research on Fischer-Tropsch Synthesis (FTS) and its capability to selectively produce short and branched hydrocarbons. In this work, FTS selectivity to gasoline range products was explored as a catalysis and process engineering problem. Novel structured catalysts for in situ upgrading of FTS products to gasoline-range hydrocarbons were successfully synthesized by coating controlled -thickness ZSM-5 films on the surface of Co-Al2O3/monolith substrates. These catalysts were synthesized on the premise that the monolith serves as an efficient mass and heat transfer structure, while the ZSM-5 layer functions as a hydrocarbon cracking and isomerization agent. Compared to traditional diesel-selective FTS, considerably higher quantity and quality of gasoline-range products were achieved with these bi-layered/bi-functional catalysts. Oil products with gasoline yield higher than 65 wt.% and selectivity to isomers and olefins greater than 70 wt.% were formed at relatively high temperature (230 degrees C) and intermediate pressure (12 bar), without compromising CO conversion, which remained as high as 79%.
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