Electron spin resonance study of the kerogen/asphaltene vanadyl porphyrins: air oxidation

摘要

Thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of the kerogens isolated from the La Luna (Venezuela), Maganik (Montenegro) and Serpiano (Switzerland) bituminous rocks at 150 and 250deg.C for 1 to 20 days in the presence of air. During the thermal treatment of the kerogens the vanadyl porphyrins' resonance signals decrease monotonically and become quite small after Six days of heating. Concomitantly, new vanadyl signals appear, and, at longer heating times, dominate the spectrum.