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v. Present participle of hydrogenate.

"The direct use of gaseous hydrogen in hydrogenating processes had been quite exceptional and was confined to a small number of cases where the catalytic properties of finely divided platinum, sponge or black, had been used, properties which had proved so valuable in direct oxidation reactions."

hydrogenated    hydrogenates    hydrogenating   

change    modify    alter   

dehydrogenate    hydrogenated    hydrogenation   

hydrogenated    hydrogenating   

hydrogenize