Functional Group Characteristics and Pyrolysis/Combustion Performance of Karamay OS Based on FT-IR and TG–DTG Analyses

[Image: see text] Proximate analysis, ultimate analysis, Fourier-transform infrared spectroscopy (FT-IR), and thermogravimetry–differential thermal analysis characterization were carried out on oily sludge (OS) samples OS1–OS5, from Karamay, Xinjiang, China. The Coast–Redfern model (CRm) was used to simulate the pyrolysis and combustion kinetics of oily samples. The results showed that the peak area percentage of benzene ring trisubstitution of OS5, in the range of 700–900 cm(–1), is close to 75%, corresponding to its high volatile content. Based on the kinetic analysis by the CRm, it is found that the fitting degree of the five samples is better when the reaction order is selected as n = 2, with R(2) close to 1.00 and 2RT/E to 0. Among them, the S(N) and D(W) of OS5 are 17.8 × 10(–10)%(2) min(–2) °C(–3) and 0.10899 × 10(–5)% min(–1) °C(–2), respectively, higher than those of other samples, indicating a good combustion performance.