Premium
Thermodynamic study of hydrocarbon synthesis from carbon dioxide and hydrogen
Author(s) -
Yao Benzhen,
Ma Wangjing,
GonzalezCortes Sergio,
Xiao Tiancun,
Edwards Peter P.
Publication year - 2017
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1694
Subject(s) - hydrocarbon , chemistry , gibbs free energy , enthalpy , hydrogen , alkane , carbon fibers , carbon dioxide , thermodynamics , atmospheric temperature range , equilibrium constant , catalysis , butane , organic chemistry , materials science , physics , composite number , composite material
The thermodynamics of jet fuel range alkane synthesis from carbon dioxide and hydrogen has been investigated. The hydrocarbon synthesis process is divided into three elementary steps, including light olefins formation (C 2 ‐C 6 ) from hydrogenation of CO 2 , α‐olefins (C 7 ‐C 16 ) synthesis from oligomerization of light olefins, and hydrogenation of α‐olefins (C 8 ‐C 16 ) to straight‐chain paraffin (C 8 ‐C 16 ). The enthalpy changes and Gibbs free energy changes of the relevant reactions were calculated, and the equilibrium products distribution was computed based on the Gibbs free energy minimization method. The calculation results show that lower temperature (below 673.15 K), higher pressure (3 MPa), higher molar ratio of H 2 to CO 2 (3:1‐4:1), and introducing a small amount of N 2 in the reactants are favorable for the hydrogenation of CO 2 ; lower temperature (below 500 K), higher pressure (2‐3 MPa), addition of N 2 is favorable for the oligomerization of light olefins; and lower temperature (below 700 K), higher pressure (2‐3 MPa), and addition of N 2 is favorable for the hydrogenation of α‐olefins. The overall positive effect of introducing N 2 results from its heat dilution of the process. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.