TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The catalytic material is platinum, palladium, rhodium, iridium, their oxides, alloys, and/or compounds. The support is from alumina, titania, and/or zirconia.Preferred Component: The modifying agent comprises lead.Preferred Composition: The CO-selective catalyst comprises modifying agent (8-15 atom%). It comprises (wt.%): catalytic material (0.5-5.0, preferably 1.8-2.5), and modifying agent (0.01-0.5, preferably 0.10-0.20). The support slurry comprises aluminum (38-40 wt.%). The catalytic material solution comprises platinum nitrate (15-19 wt.%), based on the weight of the platinum contained in the catalytic material solution. The modifying agent comprises lead nitrate (60-65 wt.%), based on the weight of the lead contained in the modifying agent solution.Preferred Method: Combining the catalytic material, support, and modifying agent, comprises forming a catalytic material solution; forming a modifying agent solution, where the modifying agent solution and the catalytic material solution comprise a solvent consisting of nitrates, sulfides, and/or chlorides; forming a support slurry; and combining the catalytic material solution, modifying agent solution, and support slurry to form a second slurry. The pH of the second slurry is adjusted to 3.0-3.5. EXAMPLE - Lead modified platinum catalyst was prepared by making a slurry of alumina in water containing 39.3 wt.% solids. To 1273 g of the slurry, platinum nitrate solution (56.19 g) containing platinum (18.17 wt.%), and lead nitrate (0.82 g) containing lead (62.56 wt.%), were added. The metal containing slurry was adjusted with nitric acid or tetramethyl ammonium hydroxide to give a final pH of 3.5, and allowed to age. The slurry was washcoated onto a 20-ppi zirconium oxide modified aluminum oxide foam. The final loading of platinum on the dried, washcoated part of catalyst was 1.75 g/cubic inch of platinum, with the washcoat containing platinum (2 wt.%) and lead (0.15 wt.%). The test result showed 0.70 mol.% oxygen selectivity, compared with the control (0.65 mol.%).