Catalyst Sample by Halston .04 oz Vial (sample) for MenCreated And Introduced By Halston In 1994 Catalyst Is A New Fragrance With An Interesting Mission. Catalyst, The Chemical Reactor, Is Said To Create An Exciting Chemistry For The Man Who Uses It! Catalyst Is A Remarkable Fusion Of Citrus, Bay, Clove, Lavender, Nutmeg And Cinnamon.