Abstract 1. A CATALYTIC COMPOSITE COMPRISING A COMBINATION OF CATALYTICALLY EFFECTIVE AMOUNTS OF PLATINUM METAL, IRIDIUM METAL, AN ALKALI OR ALKALINE EARTH METAL OXIDE AND FROM ABOUT 0.05 TO ABOUT 0.5 WT. PERCENT SULFUR WITH A POROUS CARRIER MATERIAL, WHEREIN THE PLATINUM AND IRIDIUM ARE UNIFORMLY DISPERSED IN THE CARRIER MATERIAL, WHEREIN THE PLATINUM AND IRIDIUM ARE PRESENT IN AMOUNTS SELECTED TO RESULT IN AN ATOMIC RATIO OF IRIDIUM TO PLATINUM OF ABOUT 0.5:1 TO ABOUT 1.5:1 AND WHEREIN THE COMPOSITE IS PREPARED BY THE STEPS OF: (A) FORMING A SULFUR-FREE COMPOSITE OF OXIDAZABLE PLATINUM, IRIDIUM AND ALKALI OR ALKALINE EARTH METAL COMPOUNDS WITH A POROUS CARRIER MATERIAL AND UNIFORMLY DISPERSING THE IRIDIUM AND PLATINUM COMPOUNDS IN THE CARRIER MATERIAL; (B) SUBJECTING THE RESULTING COMPOSITE TO CONTACT WITH A SULFUR-FREE, OXYGEN-CONTAINING GAS STREAM AT OXIDATION CONDITIONS SELECTED TO OXIDIZE THE PLATINUM, IRIDIUM AND ALKALI OR ALKALINE EARTH METAL COMPOUNDS TO OXIDES; (C) CONTACTING THE RESULTING OXIDIZED COMPOSITE WITH A SULFUR-FREE HYDROGEN STREAM AT REDUCTION CONDITIONS SELECTED TO REDUCE BOTH THE PLATINUM AND IRIDIUM OXIDES TO THE ELEMENTAL METALLIC STATE; AND THEREAFTER (D) PRESULFIDING THE COMPOSITE TO INCORPORATE WHEREIN FROM ABOUT 0.05 TO ABOUT 0.5 WT. PERCENT SULFUR.
A CATALYTIC COMPOSITE COMPRISING A COMBINATION OF CATALYTICALLY EFFECTIVE AMOUNTS OF PLATINUM METAL, IRIDIUM METAL, AN ALKALI OR ALKALINE EARTH METAL OXIDE AND FROM ABOUT 0.05 TO ABOUT 0.5 WT. PERCENT SULFUR WITH A POROUS CARRIER MATERIAL, WHEREIN THE PLATINUM AND IRIDIUM ARE UNIFORMLY DISPERSED IN THE CARRIER MATERIAL, WHEREIN THE PLATINUM AND IRIDIUM ARE PRESENT IN AMOUNTS SELECTED TO RESULT IN AN ATOMIC RATIO OF IRIDIUM TO PLATINUM OF ABOUT 0.5:1 TO ABOUT 1.5:1 AND WHEREIN THE COMPOSITE IS PREPARED BY THE STEPS OF: (A) FORMING A SULFUR-FREE COMPOSITE OF OXIDAZABLE PLATINUM, IRIDIUM AND ALKALI OR ALKALINE EARTH METAL COMPOUNDS WITH A POROUS CARRIER MATERIAL AND UNIFORMLY DISPERSING THE IRIDIUM AND PLATINUM COMPOUNDS IN THE CARRIER MATERIAL; (B) SUBJECTING THE RESULTING COMPOSITE TO CONTACT WITH A SULFUR-FREE, OXYGEN-CONTAINING GAS STREAM AT OXIDATION CONDITIONS SELECTED TO OXIDIZE THE PLATINUM, IRIDIUM AND ALKALI OR ALKALINE EARTH METAL COMPOUNDS TO OXIDES; (C) CONTACTING THE RESULTING OXIDIZED COMPOSITE WITH A SULFUR-FREE HYDROGEN STREAM AT REDUCTION CONDITIONS SELECTED TO REDUCE BOTH THE PLATINUM AND IRIDIUM OXIDES TO THE ELEMENTAL METALLIC STATE; AND THEREAFTER (D) PRESULFIDING THE COMPOSITE TO INCORPORATE WHEREIN FROM ABOUT 0.05 TO ABOUT 0.5 WT. PERCENT SULFUR.
Claim 2
Dependent Claim
195 words
A CATALYTIC COMPOSITE COMPRISING A COMBINATION OF CATALYTICALLY EFFECTIVE AMOUNTS OF PLATINUM METAL, IRIDIUM METAL, AN ALKALI OR ALKALINE EARTH METAL OXIDE AND FROM ABOUT 0.05 TO ABOUT 0.5 WT. PERCENT SULFUR WITH A POROUS CARRIER MATERIAL, WHEREIN THE PLATINUM AND IRIDIUM ARE UNIFORMLY DISPERSED IN THE CARRIER MATERIAL, WHEREIN THE PLATINUM AND IRIDIUM ARE PRESENT IN AMOUNTS SELECTED TO RESULT IN AN ATOMIC RATIO OF IRIDIUM TO PLATINUM OF ABOUT 0.5:1 TO ABOUT 1.5:1 AND WHEREIN THE COMPOSITE IS PREPARED BY THE STEPS OF: (A) FORMING A SULFUR-FREE COMPOSITE OF OXIDAZABLE PLATINUM, IRIDIUM AND ALKALI OR ALKALINE EARTH METAL COMPOUNDS WITH A POROUS CARRIER MATERIAL AND UNIFORMLY DISPERSING THE IRIDIUM AND PLATINUM COMPOUNDS IN THE CARRIER MATERIAL; (B) SUBJECTING THE RESULTING COMPOSITE TO CONTACT WITH A SULFUR-FREE, OXYGEN-CONTAINING GAS STREAM AT OXIDATION CONDITIONS SELECTED TO OXIDIZE THE PLATINUM, IRIDIUM AND ALKALI OR ALKALINE EARTH METAL COMPOUNDS TO OXIDES; (C) CONTACTING THE RESULTING OXIDIZED COMPOSITE WITH A SULFUR-FREE HYDROGEN STREAM AT REDUCTION CONDITIONS SELECTED TO REDUCE BOTH THE PLATINUM AND IRIDIUM OXIDES TO THE ELEMENTAL METALLIC STATE; AND THEREAFTER (D) PRESULFIDING THE COMPOSITE TO INCORPORATE WHEREIN FROM ABOUT 0.05 TO ABOUT 0.5 WT. PERCENT SULFUR.