Abstract: A process for regenerating a coke contaminated reforming catalyst comprising platinum on a molecular sieve, said process consisting essentially of contacting said catalyst with a halogen-free oxygen-containing gas at a temperature of less than 780.degree. F. for a sufficient period of time such that the aromatization activity is restored to within 20.degree. F. of the activity said catalyst possessed at the start of the previous run cycle.

Abstract: A naphtha feed is contacted in a penultimate reforming stage under catalytic reforming conditions with a first catalyst. The effluent from the penultimate reforming stage is contacted in a final reforming stage under catalytic reforming conditions and at substantially the same pressure as is maintained in the penultimate reforming stage with a second catalyst. The reforming pressure is selected to provide optimal OB/CD production of product reformate of a desired RON from the final stage.

Abstract: A process for selectively converting adsorbable hydrocarbon feeds containing straight-chain and slightly branched-chain hydrocarbons to olefins by contacting the feeds with crystalline silicates.

Abstract: The volume ratio of CO.sub.2 /CO in cracking catalyst regenerator flue gas is increased without adverse effect on cracking conversion and selectivity by employing a chromium oxidation catalyst at a high concentration in a small proportion of particles circulating in a cracking system.

Abstract: A process for selectively converting adsorbable hydrocarbon feeds containing straight-chain and slightly branched-chain hydrocarbons to olefins by contacting the feeds with crystalline silicates.

Abstract: Sulfur-containing impurities are removed from a refined hydrocarbon feed by contact thereof with a porous sulfur-reactive agent having a pore volume of at least 0.15 cc per cc of which at least 5% is in pores having a diameter in the range 0.1 to 15 microns. The agent contains at least one sulfur-reactive material from the group copper, iron, zinc and compounds thereof.

Abstract: A catalyst composition, a method for its preparation and a hydrotreating process using same. The catalyst comprises a rigidly interconnected pack of irregularly shaped particles having an average diameter below 0.15 mm. Among the particles and throughout the pack are access channels comprising interconnected macropores having diameters in the 0.1 to 15 micron range which contribute at least 5 percent of the pore volume. The particles comprise materials selected from the group consisting of at least one refractory oxide component and one hydrogenation component. For each 100 parts of the oxide component the composition contains, in parts by weight, an amount of the hydrogenating component, calculated as metal, in the range from 0.1 to 50 parts.

Abstract: Sulfur-containing impurities are removed from a refined hydrocarbon feed by contact thereof with a porous sulfur-reactive agent having a pore volume of at least 0.15 cc per cc of which at least 5% is in pores having a diameter in the range 0.1 to 15 microns. The agent contains at least one sulfur-reactive material from the group copper, iron, zinc and compounds thereof.

Abstract: A catalyst composition, a method for its preparation and a hydrotreating process using same. The catalyst comprises a rigidly interconnected pack of irregularly shaped particles having an average diameter below 0.15 mm. Among the particles and throughout the pack are access channels comprising interconnected macropores having diameters in the 0.1 to 15 micron range which contribute at least 5 percent of the pore volume. The particles comprise materials selected from the group consisting of at least one refractory oxide component and one hydrogenation component. For each 100 parts of the oxide component the composition contains, in parts by weight, an amount of the hydrogenating component, calculated as metal, in the range from 0.1 to 50 parts.