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When a nickel on silica-alumina catalyst is sulfided, two of the principal changes observed in the hydrocracking of n-decane are: (1) the over-all rate of reaction increases greatly and (2) the predominant reaction changes from isomerization to cracking. This type of cracking is similar to that observed with the silica-alumina support alone. It is concluded from these and other observations that the catalyst before sulfiding contains both nickel metal and nickel salts of the silica-alumina acid sites. On sulfiding, the nickel metal is converted to nickel sulfide, and the HzS reacts with the nickel-silica-alumina salts to regenerate the original strong acid sites of the silica-alumina support.

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