Abstract: The present invention comprises a method for lowering the carbon monoxide content of a CO-containing hydrogen-rich gas stream by contacting the gas stream with a scavenger capable of preferentially oxidizing the carbon monoxide in the gas stream and then regenerating the scavenger. The scavenger is selected from the group of mixed oxides of manganese and copper; mixed oxides of manganese and copper in combination with mixed oxides of silver, nickel, iron, and tin; mixed oxides of tin and copper; SnO.sub.2 --CuO gels; and mixtures thereof. Preferably the scavenger will have a surface area from about 0.5 to about 200 m.sup.2 /gm.

Abstract: The invention is a composition, comprising: a carbon-supported, dispersed platinum-zinc alloy having the formula Pt-Zn.sub.x /C wherein x ranges from greater than 0.05 to less than 1 wherein platinum is in the form of platinum particles ranging in size from about 20 .ANG. to about 30 .ANG. on a carbon support, wherein the carbon is in the form of high surface area carbon having surface area ranging from about 100 to about 500 m.sup.2 /g, and the platinum particles are present in an amount ranging from about 10 to about 40 wt % on the carbon support. The composition is made by the process of depositing on the carbon support a soluble zinc source selected from the group of zinc nitrate, acetate, halides, formates, oxalates, and acetyl acetonates and mixtures thereof; calcining to convert the zinc source to ZnO; and then reducing the zinc oxide at a temperature ranging from about 250.degree. C. to about 600.degree. C.