Conversion of CO to CO2
AssigneePressure Chemical Company
InventorJoseph Pugach
Life of this patent
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Abstract
Gold oxide is precipitated together with iron oxide from a solution containing a gold source and an iron source; the gel formed thereby is washed, dried, ground to a size range of 0.85 mm to 4.25 mm, calcined and activated by passing a hydrogen and oxygen containing gas through it; then used as a catalyst for oxidizing CO to CO2 in the presence of a large excess of hydrogen.
Claims26
Method of oxidizing CO in a mixture of gases including oxygen and at least 65% by volume hydrogen comprising passing said mixture of gases through a catalyst bed comprising an unsupported catalyst made by (a) preparing an aqueous iron/gold solution comprising an iron source and a gold source (b) gradually combining said iron/gold solution with an aqueous solution of an alkali metal base to maintain a pH of 7 to 9 in the combined solution as the solutions are combined, thereby producing solids in said combined solution (c) separating said solids from said combined solution (d) washing said solids, (e) drying said solids, (f) grinding said solids to a size range of 0.85 mm to 4.25 mm, (g) calcining said solids, and (h) activating said catalyst by passing a hydrogen and oxygen containing gas through said catalyst for at least 12 hours at a temperature of 60-90° C.
Method of oxidizing CO in a mixture of gases including oxygen and at least 65% hydrogen by volume and wherein said CO is present in an amount from 200 ppm to 20,000 ppm by volume, said gas also containing methane, comprising passing said mixture of gases through a catalyst bed comprising a particulate unsupported catalyst made by (a) preparing an aqueous iron/gold solution comprising an iron source and a gold source (b) gradually combining said iron/gold solution with an aqueous solution of an alkali metal base to maintain a pH of 7 to 9 in the combined solution as the solutions are combined, thereby producing solids in said combined solution (c) separating said solids from said combined solution (d) washing said solids, (e) drying said solids, (f) grinding said solids to a size range of 0.85 mm to 4.25 mm, (g) calcining said solids, and (h) activating said catalyst by passing through said catalyst a mixture of hydrogen and oxygen in a ratio by volume of about 0.25/65 to 6/65 for at least 12 hours, wherein the gold in said catalyst is present in an amount from 0.25% to 10% by weight of the iron in said catalyst.
Method of oxidizing CO in a mixture of gases including oxygen and at least 65% by volume hydrogen comprising passing siad mixture of gases through a catalyst bed comprising an unsupported catalyst made by (a) preparing an aqueous iron solution from a suitable iron source (b) preparing an aqueous gold solution from a suitable gold source (c) gradually combining said iron solution with an aqueous solution of an alkali metal base to maintain a pH of 7 to 9 in the combined solution as the solutions are combined, thereby producing a slurry of solid in said combined solution (d) gradually combining said gold solution with the slurry while also adding a solution of an alkali metal base to maintain the pH at 7 to 9 in said slurry (e) separating the solids from said slurry (f) washing said solids (g) drying said solids (h) grinding said solids to a size range of 0.85 mm to 4.25 mm (I) calcining said solids and (j) activating said catalyst by passing a hydrogen and oxygen containing gas through said catalyst for at least 12 hours at a temperature of 60-90° C.
Dependencies are inferred from the claim text.