Incorporation of vanadyl porphyrins into kerogen structures during catagenesis

Natural vanadyl (VO2+)-deoxophylloerythroetioporphyrins (DPEP) are shown to be capable of reacting and quantitatively incorporating into the immature kerogen model materials (torbanite, lignites, subbituminous coal and an imm ature lacustrine kerogen) at 200 degrees C for 72 h in the absence/presence of air oxygen. Electron spin resonance is used to monitor the incorporatio n of VO2+-DPEP into the kerogen models. The products of the incorporation r esemble natural kerogen enriched with VO2+-DPEP. The simulation experiments described in this paper clearly show that the kerogen VO2+-P may originate from VO2+-DPEP incorporation into the kerogen macromolecular structures du ring catagenesis. (C) 2000 Elsevier Science Ltd. All rights reserved.