Coal Technology for Power, Liquid Fuels, and Chemicals

2017 ◽  
pp. 107-183
Author(s):  
Burtron H. Davis ◽  
James C. Hower
Keyword(s):  
Liquid Fuels ◽  
Fuels And Chemicals ◽  
Coal Technology

Coal Technology for Power, Liquid Fuels, and Chemicals

2007 ◽  
pp. 843-906
Author(s):  
R. D. Srivastava ◽  
H. G. McIlvried ◽  
J. C. Winslow ◽  
C. P. Maronde ◽  
R. P. Noceti
Keyword(s):  
Liquid Fuels ◽  
Fuels And Chemicals ◽  
Coal Technology

scholarly journals Production of Fuels and Chemicals from a CO2/H2 Mixture

Reactions ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 130-146
Author(s):  
Yali Yao ◽  
Baraka Celestin Sempuga ◽  
Xinying Liu ◽  
Diane Hildebrandt
Keyword(s):  
Co2 Hydrogenation ◽  
Water Gas Shift ◽  
Liquid Fuels ◽  
Saturated Hydrocarbons ◽  
Reverse Water Gas Shift ◽  
Cu Catalyst ◽  
In Series ◽  
Fuels And Chemicals ◽  
Water Gas ◽  
Aspen Simulation

In order to explore co-production alternatives, a once-through process for CO2 hydrogenation to chemicals and liquid fuels was investigated experimentally. In this approach, two different catalysts were considered; the first was a Cu-based catalyst that hydrogenates CO2 to methanol and CO and the second a Fisher–Tropsch (FT) Co-based catalyst. The two catalysts were loaded into different reactors and were initially operated separately. The experimental results show that: (1) the Cu catalyst was very active in both the methanol synthesis and reverse-water gas shift (R-WGS) reactions and these two reactions were restricted by thermodynamic equilibrium; this was also supported by an Aspen plus simulation of an (equilibrium) Gibbs reactor. The Aspen simulation results also indicated that the reactor can be operated adiabatically under certain conditions, given that the methanol reaction is exothermic and R-WGS is endothermic. (2) the FT catalyst produced mainly CH4 and short chain saturated hydrocarbons when the feed was CO2/H2. When the two reactors were coupled in series and the presence of CO in the tail gas from the first reactor (loaded with Cu catalyst) significantly improves the FT product selectivity toward higher carbon hydrocarbons in the second reactor compared to the standalone FT reactor with only CO2/H2 in the feed.

scholarly journals Production of alkanes from CO2 by engineered bacteria

2018 ◽  
Author(s):  
Tapio Lehtinen ◽  
Henri Virtanen ◽  
Suvi Santala ◽  
Ville Santala
Keyword(s):  
Production Systems ◽  
Liquid Fuels ◽  
Modular System ◽  
Fatty Aldehyde ◽  
Efficient Production ◽  
Acinetobacter Baylyi ◽  
Single Organism ◽  
Fuels And Chemicals ◽  
Microbial Biosynthesis ◽  
Long Chain

AbstractBackgroundMicrobial biosynthesis of alkanes is considered a promising method for the sustainable production of drop-in fuels and chemicals. Carbon dioxide would be an ideal carbon source for these production systems, but efficient production of long carbon chains from CO2is difficult to achieve in a single organism. A potential solution is to employ acetogenic bacteria for the reduction of CO2to acetate, and engineer a second organism to convert the acetate into long-chain hydrocarbons.ResultsIn this study, we demonstrate alkane production from CO2by a system combining the acetogenAcetobacterium woodiiand a non-native alkane producerAcinetobacter baylyiADP1 engineered for alkane production. Nine synthetic two-step alkane biosynthesis pathways consisting of different aldehyde- and alkane-producing enzymes were combinatorically constructed and expressed inA. baylyi.The aldehyde-producing enzymes studied were AAR fromSynechococcus elongatus,Acr1 fromA. baylyi,and Ramo, a putative dehydrogenase, fromNevskia ramosa.The alkane-producing enzymes were ADOs fromS. elongatusandNostoc punctiforme,and CER1 fromArabidopsis thaliana.The performance of the pathways was evaluated with a twin-layer biosensor, which allowed the monitoring of both the intermediate, fatty aldehyde, as well as the alkane production. The highest alkane production, as indicated by the biosensor, was achieved with a pathway consisting of AAR and ADO fromS. elongatus.The performance of this pathway was further improved by balancing the relative expression levels of the enzymes in order to limit the accumulation of the intermediate fatty aldehyde. Finally, the acetogenA. woodiiwas used to produce acetate from CO2and H2, and the acetate was used for alkane production by the engineeredA. baylyi,thereby leading to the net production of long-chain alkanes from CO2.ConclusionsA modular system for the production of drop-in liquid fuels from CO2was demonstrated. Among the studied synthetic pathways, the combination of ADO and AAR fromS. elongatuswas found to be the most efficient in heterologous alkane production inA. baylyi.Furthermore, limiting the accumulation of the fatty aldehyde intermediate was found to be beneficial for the alkane production.

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