| 摘要 |
A method for improving the performance of catalysts by the addition of small amounts of oxygen to feed stock streams. Examples are shown for the improved operation of gold-ceria catalysts in the water-gas shift (WGS) and PROX reactions. The catalytic material is made by depositing catalytic metals, such as gold or platinum, on substrate materials, such as doped or undoped ceria. The deposited metal, which comprises both crystalline and non-crystalline structures, is treated, for example with aqueous basic NaCN solution, to remove at least some of the crystalline metallic component. The remaining noncystalline metallic component associated with the substrate exhibits catalytic activity that is substantially similar to the catalyst as prepared. The use of the catalyst is contemplated in efficient, cost-effective reactions, such as removal of carbon monoxide from fuel gases, for example by performing the water gas shift reaction and/or the PROX reaction. |
