WASHINGTON, June 26 — Organic wastes such as paper mill sludge or cheese whey can be converted into hydrogen using an inexpensive metal catalyst, researchers say, in a process that could boost efforts to replace oil and gas fuels. RESEARCHERS AT the University of Wisconsin tested more than 300 metal combinations before finding that a mix of nickel, tin and aluminum could separate hydrogen from a mixture rich in glucose, a sugar common in many organic wastes. A report on the study appears Friday in the journal Science.

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