Naphtha is selectively hydrodesulfurized in the presence of a sulfided, treated catalyst comprising at least a Group VIB metal catalytic component, to produce sulfur-reduced naphtha with reduced olefin loss due to saturation. The catalyst is treated with hydrogen, a selectively deactivating agent which deactivates its hydrogenation activity, and a protective agent which preserves its hydrodesulfurization activity during the treatment.

 
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> Catalyst composition comprising anionic clay and rare earth metals, its preparation and use in FCC

> Composition for reducing O.sub.x emissions in FCC regeneration process

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