Hydrocarbon upgrading process

A process of upgrading a sulfur and olefin containing feed fraction containing at least 100 ppm S, and boiling in the gasoline boiling range which comprises:

• contacting such sulfur and olefin containing gasoline boiling range feed fraction with a hydrotreating catalyst at temperatures of at least about 650.degree. F., which comprises a) a substantially acidic porous refractory solid having an intermediate effective pore size and the topology of a zeolitic behaving material corresponding to at least one member of the group consisting of ZSM-5, ZSM-11, ZSM-22, ZSM-23, ZSM-35, ZSM-50, MCM-22, and mordenite, b) a Group VI metal, c) a Group VIII metal, and d) a suitable refractory support, under hydrotreating conditions comprising a temperature of about 650.degree. to 900.degree. F., a pressure of about 50 to 1500 psig, a space velocity of about 50 to 1500 psig, a space velocity of about 0.5 to 10 LHSV, and a hydrogen to hydrocarbon ratio of about 500 to 5000 standard cubic feet of hydrogen per barrel of feed, which are sufficient to separate at least some of the sulfur from the feed molecules and convert such to hydrogen sulfide, to produce a product comprising a normally liquid fraction boiling in substantially the same boiling range as the feed, but which has a lower sulfur content than the feed and which has a research octane number (RON) substantially no less than the feed;
• and
• recovering at least the gasoline boiling range fractions so produced.