Deep Conversion of Carbon Monoxide to Hydrogen and Formation of Acetate by the Anaerobic ThermophileCarboxydothermus hydrogenoformans | Zendy

Anne M. Henstra | Zendy; Alfons J. M. Stams | Zendy

Open Access

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

Author(s) -

Anne M. Henstra,

Alfons J. M. Stams

Publication year - 2011

Publication title -

international journal of microbiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.696

H-Index - 40

eISSN - 1687-9198

pISSN - 1687-918X

DOI - 10.1155/2011/641582

Subject(s) - thermophile , carbon monoxide , hydrogen , anaerobic exercise , carbon dioxide , catalysis , carbon fibers , chemistry , carbon monoxide dehydrogenase , gibbs free energy , hydrogen production , water gas shift reaction , materials science , biochemistry , organic chemistry , biology , thermodynamics , physics , enzyme , physiology , composite number , composite material

Carboxydothermus hydrogenoformans is 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 of C. hydrogenoformans grown in batch cultures that were started with a 100% CO gas phase with and without removal of formed CO 2 . Final CO levels were 117 ppm without CO 2 removal and below 2 ppm with CO 2 removal. The Gibbs free energy change calculated with measured end concentrations and the detection of acetate suggest that C. hydrogenoformans shifted from a hydrogenogenic to an acetogenic metabolism.

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