Water-gas shift reaction catalyzed by redox enzymes on conducting graphite platelets

Oliver Lazarus, Thomas W Woolerton, Alison Parkin, Michael J Lukey, Erwin Reisner, Javier Seravalli, Elizabeth Pierce, Stephen W Ragsdale, Frank Sargent, Fraser A Armstrong

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The water-gas shift (WGS) reaction (CO + H(2)O CO(2) + H(2)) is of major industrial significance in the production of H(2) from hydrocarbon sources. High temperatures are required, typically in excess of 200 degrees 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 degrees 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.
Original languageEnglish
Pages (from-to)14154-5
Number of pages2
JournalJournal of the American Chemical Society
Issue number40
Publication statusPublished - 14 Oct 2009

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