Fig. 2: TEMPO-trapping experiments and proposed mechanism.
From: Hydrogenation of different carbon substrates into light hydrocarbons by ball milling
a, b TEMPO-trapping experiments. Reaction conditions: 450 rpm, 7 h of milling time, 170 bar of H2, 10 10 mm stainless steel balls, 50 mg of activated carbon (AC) or polyethylene (PE), 200 mg of Fe, 300 mg of γ-Al2O3, 25 mg of TEMPO. c Reaction mechanism. Alkyl radicals are first generated by mechanical forces. Then alkyl radicals react with surface atomic hydrogens which are from dissociative adsorption of H2 over metal surface. d Temperature profile of exterior wall of the jar throughout the reaction. Reaction conditions: 450 rpm, 21 h of milling time, 170 bar of H2, 10 10 mm stainless steel balls, 50 mg of activated carbon, 200 mg of Fe, 300 mg of γ-Al2O3. Source data are provided as a Source Data file.
