Evolutionary Analysis of Coal Molecular Structure under Different Metamorphism: An Attempt to Use Electron Paramagnetic Resonance.

From the overall fitting results in Figure 7 , it can be seen that as the vitrinite reflectance R max 0 increases, the free radical concentration N g did not increase in general, but showed a trend of “decreasing, then increasing, then decreasing, and decreasing in general”, and N g obtained a minimum value around R max 0 = 1.75%.

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