https://doi.org/10.3390/en16010079
“FTIR results of different experimental conditions are shown in Figure 4, which reveal a change in transmittance with the corresponding wavenumber. The black, red, gray, and blue curves represent the results of original heavy oil and electric power at 50 W, 100 W, and 200 W, respectively.
Figure 4. FTIR results of US irradiation time 6 min.
As is given in Figure 4, it could be gotten that 719 cm−1 and 747 cm−1 may express the NH out-of-plane bending vibration. The aldehyde C-H out-of-plane bending vibration existed at 809 cm−1 and 861 cm−1. Methyl and methylene angular vibration appeared at 1378 cm−1 and 1458 cm−1. The position of 1605 cm−1 and 2724 cm−1 represented the aromatic ring skeleton vibration, and the aldehyde C-H stretching vibration, severally. The methylene stretching vibration appeared at 2857 cm−1 and 2924 cm−1 [32].
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