Water-gas shift reaction catalyzed by redox enzymes on conducting graphite platelets.
Water-gas shift reaction catalyzed by redox enzymes on conducting graphite platelets.
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DOI：
10.1021/ja905797w
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发表时间：
2009-10-14
影响因子：
15
通讯作者：
Armstrong FA
中科院分区：
文献类型：
--
作者：
Lazarus O;Woolerton TW;Parkin A;Lukey MJ;Reisner E;Seravalli J;Pierce E;Ragsdale SW;Sargent F;Armstrong FA
水煤气变换（WGS）反应（CO + H2O → CO2 + H2）在从烃源生产H2中具有重要的工业意义。使用氧化物载体上的d-金属催化剂需要高温，通常超过200 °C。在我们的研究中，WGS过程被分成两个半电池电化学反应（H+还原和CO氧化），由附着在导电颗粒上的酶催化。H+还原反应由来自大肠杆菌的氢化酶Hyd-2催化，CO氧化由来自产氢羧热菌的一氧化碳脱氢酶（CODH I）催化。这产生了高效的多相催化剂，其在30 °C下的转换频率为每个最小功能单元（CODH/Hyd-2对）至少2.5 s-1，这与传统的高温催化剂相当。
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 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.