Programming Parallel Applications In Cilk

A process for removing vanadium and nickel deactivants from contaminated hydrodesulfurization catalysts comprising Group VIB and/or VIII active components on refractory oxide supports comprising contacting said catalysts with an aqueous solution of (1) oxalic acid and (2) at least one inorganic component selected from the class consisting of nitric acid and water-soluble nitrate salts.The removal of vanadium and nickel contaminants from the surface of a deactivated catalyst by the process of the invention substantially rejuvenates the catalyst for hydrodesulfurization purposes, provided such removal is accomplished prior to burning off any coke that may also be present on said catalysts.

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