High activity, high yield tin-modified platinum-iridium catalysts, and reforming process using same

• Main Authors: BAIRD JR., WILLIAM CHALMERS, BOYLE, JOSEPH PHILIP, SWAN III, GEORGE ALEXANDER
• Format: Patent
• Language: English; French; German
• Published: 17.06.1992
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CRACKING HYDROCARBON OILS; FUELS; LUBRICANTS; METALLURGY; MINERAL WAXES; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THEIR RELEVANT APPARATUS; TRANSPORTING

Tin-modified platinum-iridium catalysts provide high yields of C5+ liquid reformate in catalytic reforming, concurrent with high activity. Tin-modified platinum-iridium catalysts are of unusually high selectivity, as contrasted with known iridium-promoted platinum catalysts. The high selectivity is manifested in reforming a naphtha feed in a reactor charged to capacity with the catalyst, but particularly when used in the dehydrocyclization zone, or tail reactor, of a series of reactors wherein the lead reactors of the series contain a non tin-containing platinum catalyst, especially a platinum-iridium, or a platinum-rhenium catalyst. The tin-modified platinum-iridium catalysts are also highly active, with only moderate loss in the high activity for which iridium-stabilized platinum catalysts are known.