| 摘要 |
<p>The invention pertains to the preparation and use of catalytic materials and catalyst members for the selective oxidation of carbon monoxide in a gas stream that contains hydrogen. One such catalyst member may be produced by depositing by electric arc spraying a metal feedstock onto a metal substrate to provide a metal anchor layer on the substrate, and depositing a catalytic material comprising platinum and iron dispersed on a refractory inorganic oxide support material onto the metal substrate. The catalytic material may optionally be produced by wetting the support material, especially a particulate support material, with a platinum group metal solution and iron solution and drying and calcining the wetted support material in air at a temperature in the range of from 200 °C to 300 °C, preferably using a solution containing bivalent platinum ion species. The catalyst member may be used by flowing the gas stream therethrough at a temperature of about 90 °C with an O2:CO ratio of about 1:1 and a space velocity of about 20,000/hr or, alternatively, at a temperature of about 150 °C with an O2:CO ratio of about 1.5:1 and a space velocity of about 80,000/hr.</p> |
