Preliminary study on the targeted inhibition of chemical inhibitor on the oxidation of active groups in coal

Antioxidant is an important material in inhibitor fire prevention technology. The efficient utilization of chemical inhibitors to maximize their antioxidant effects is of significant importance. Based on this, the inhibitory effect of antioxidants on the coal oxidation process was explored by programmed heating experiment. The difference in the inerting effect of antioxidants was analyzed by electron paramagnetic resonance spectroscopy(EPR), and the targeted inhibition effect of antioxidants on the active groups in coal was quantitatively evaluated by Fourier Transform infrared spectroscopy(FT-IR). The results are as follows: The oxidation products emitted by coal samples treated with different antioxidants reduced compared to raw coal, and the intersection temperature elevated compared to that of raw coal, indicating that antioxidants can effectively impede coal oxidation spontaneous combustion. The association between the rule of gas production and heat production in coal samples indicated that the inhibitory effect of antioxidants is generally not proportional to their inhibition life. The variation in the inerting effect of antioxidants arose from their different inerting effects on coal oxygen radicals. The inhibition efficiency of antioxidants on the active structure in coal was notably high, typically ranging from 44% to 99%. GSH and DPA showed an effective and balanced inhibitory effect on the active structure of coal. The inhibition effect of CA on various active structures was also balanced but relatively weak. Tempo and PA showed a significant influence the structures of aliphatic hydrocarbons and hydroxyl groups, but had no a notable effect on aromatic structures and oxygen-containing functional groups. The research findings can provide a theoretical foundation for selecting chemical inhibitors and developing antioxidant chemical inhibitors informed by the targeted selection of coal types.