Investigation of acetylene addition to Fischer–Tropsch Synthesis
Fischer–Tropsch Synthesis was conducted with acetylene (13C2H2) probes added over iron catalyst under mild conditions. The analysis by 13C NMR spectroscopy illustrated that the labeled carbons of 13C2H2 were transformed to terminal units of 13CH313CH2 and 13CH213CH in the 1-alkene product (propene, 1-butene). It is proposed that the added acetylene is partially transformed to ethylene. The remaining acetylene is converted to an initiator (CH2CH), and ethylene is transformed to a chain growth monomer (CH2CH2). Both the initiator and the monomer enter carbon chain in different paths. This corresponds with a “Di-Carbon Polymeric Monomer” hypothesis that we proposed before.
Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► The labeled carbons of acetylene (13C2H2) transformed to 13CH3–13CH2– and 13CH2=13CH–. ► A “Di-Carbon Polymeric Monomer” mechanism. ► The added 13C2H2 enters carbon chain following two paths.
Journal: Catalysis Communications - Volume 12, Issue 12, 1 July 2011, Pages 1146–1148