(Chemical Equation Presented) The water-gas shift (WGS) reaction (CO + H2O ⇆ CO2 + H2) is of major industrial significance in the production of H2 from hydrocarbon sources. High temperatures are required, typically in excess of 200°C, using d-metal catalysts on oxide supports. In our study the WGS process is separated into two half-cell electrochemical reactions (H+ reduction and CO oxidation), catalyzed by enzymes attached to a conducting particle. The H + reduction reaction is catalyzed by a hydrogenase, Hyd-2, from Escherichia coli, and CO oxidation is catalyzed by a carbon monoxide dehydrogenase (CODH I) from Carboxydothermus hydrogenoformans. This results in a highly efficient heterogeneous catalyst with a turnover frequency, at 30°C, of at least 2.5 s-1 per minimum functional unit (a CODH/Hyd-2 pair) which is comparable to conventional high-temperature catalysts.
ASJC Scopus subject areas
- Colloid and Surface Chemistry