Reaction of methyl radicals with metal powders immersed in aqueous solutions

Abstract

Methyl radicals radiolytically produced in aqueous solutions react efficiently with Cr-0, Mn-0, Fe-0, Ni-0, Cu-0 and Zn-0 powders immersed in the solution. The Cr-0, Mn-0,Fe-0, Ni-0 and Znl powders reduce the radicals to form methane. On the other hand the Cu-0 powder seems to oxidize the radicals. Surprisingly a part of the energy absorbed by the Cr-0, Fe-0, Ni-0 and Znl powders is transferred to the aqueous solution, thus increasing the radical yield. CH4, C2H4, C2H6, C3H6 and C3H8 are formed when an aqueous deaerated buffer solution, pH 4-5, is added to powders of analytical iron, zinc, manganese and chromium. The source of these gases is carbon traces present, as atoms or atom clusters, in the "analytical" metal powders. These carbon atoms, when present on the surface of the metals; are reduced by the metal particles in aqueous solutions. This mechanism might be the source of light alkanes and alkenes in the prebiotic era. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).