| 摘要 |
The invention provides copper-based preferential oxidation catalysts containing low concentrations of platinum group metals, and processes that utilize the catalysts for selectively oxidizing carbon monoxide from an input gas stream that contains carbon monoxide, oxygen and hydrogen. Processes that are conducted with the disclosed preferential oxidation catalysts achieve selective oxidization of carbon monoxide with minimal consumption of hydrogen over wide temperature ranges. In some embodiments,_the catalysts of the invention have an oxide support on which is dispersed copper or an oxide thereof, a platinum group metal and a reducible metaloxide. In other embodiments, the catalysts have a cerium oxide support on which is dispersed copper or an oxide thereof and a platinum group metal. The invention also provides apparatus, such as fuel processors, that supply hydrogen to a fuel cell, that incorporate the disclosed preferential oxidation catalysts. |
