scholarly journals Deep Conversion of Carbon Monoxide to Hydrogen and Formation of Acetate by the Anaerobic ThermophileCarboxydothermus hydrogenoformans

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
Anne M. Henstra ◽  
Alfons J. M. Stams
Keyword(s):  
Carbon Monoxide ◽  
Hydrogen Gas ◽  
Strictly Anaerobic ◽  
Gibbs Free Energy Change ◽  
Batch Cultures ◽  
Co Conversion ◽  
Low Levels ◽  
Shift Reaction ◽  
Water Gas ◽  
Interesting Alternative

Carboxydothermus hydrogenoformansis a thermophilic strictly anaerobic bacterium that catalyses the water gas shift reaction, the conversion of carbon monoxide with water to molecular hydrogen and carbon dioxide. The thermodynamically favorable growth temperature, compared to existing industrial catalytic processes, makes this organism an interesting alternative for production of cheap hydrogen gas suitable to fuel CO-sensitive fuel cells in a future hydrogen economy, provided sufficiently low levels of CO are reached. Here we study CO conversion and final CO levels in cultures ofC. hydrogenoformansgrown in batch cultures that were started with a 100% CO gas phase with and without removal of formed CO2. Final CO levels were 117 ppm without CO2removal and below 2 ppm with CO2removal. The Gibbs free energy change calculated with measured end concentrations and the detection of acetate suggest thatC. hydrogenoformansshifted from a hydrogenogenic to an acetogenic metabolism.

Hard templating ultrathin polycrystalline hematite nanosheets: effect of nano-dimension on CO2 to CO conversion via the reverse water-gas shift reaction

Nanoscale ◽  
2017 ◽  
Vol 9 (35) ◽  
pp. 12984-12995 ◽  
Author(s):  
Zachary S. Fishman ◽  
Yulian He ◽  
Ke R. Yang ◽  
Amanda W. Lounsbury ◽  
Junqing Zhu ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Iron Hydroxide ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Hard Template ◽  
Reverse Water Gas Shift ◽  
Co Conversion ◽  
Shift Reaction ◽  
Water Gas ◽  
Hard Templating

Copper oxide nanosheets as a hard template for ultrathin iron hydroxide/oxide nanosheets.

Activity of Au, Ni, and Au-Ni catalysts in the water-gas shift reaction and carbon monoxide oxidation

2014 ◽  
Vol 55 (3) ◽  
pp. 311-318 ◽  
Author(s):  
S. A. Nikolaev ◽  
E. V. Golubina ◽  
L. M. Kustov ◽  
A. L. Tarasov ◽  
O. P. Tkachenko
Keyword(s):  
Carbon Monoxide ◽  
Carbon Monoxide Oxidation ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Ni Catalysts ◽  
Shift Reaction ◽  
Water Gas

Low Temperature Water-Gas Shift Reaction on Au-CeO2/Al2O3 Catalysts

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Hacer Gunes ◽  
Ramazan Yildirim
Keyword(s):  
Low Temperature ◽  
Reaction System ◽  
Water Gas Shift ◽  
Alumina Support ◽  
Co Conversion ◽  
Co Concentration ◽  
Negative Effect ◽  
Shift Reaction ◽  
Water Gas ◽  
Temperature Water

The low temperature water gas shift activities of Au-CeO2/Al2O3 catalysts were studied in this work. The catalysts were prepared by impregnation of CeO2 on alumina support followed by the homogeneous deposition precipitation of Au on CeO2/Al2O3. The catalysts were tested in a microflow reaction system. It was found that the activity of the catalyst increased with increasing Ce loading from 2.5 wt.% to 10 wt.% significantly while the increase in the activity was minor with the further increase of the ceria to 20 wt.%. The increasing Au content from 1 wt.% to 3 wt.% inversely affected the activity but the conversion increased with increasing Au to 5 wt.%. It was observed that the activity of 5wt.%Au/20wt.%Ce/Al2O3 decreased with increasing CO concentration. On the other hand, the CO conversion was increased with increasing H2O in the feed (significantly up to 10% H2O and then slightly after that). The 15% CO2 in the feed decreased catalytic activity slightly while the negative effect of 60% H2 was more dramatic. The presence of both CO2 and H2 in the feed together resulted the lowest conversion as expected.

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