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Gel permeation chromatograms of the lignin oils obtained using the 20NiMoP/AC catalysts at different temperatures and reaction times: (a) 400 °C-0 h, (b) 400 °C-2 h, (c) 400 °C-4 h, (d) 400 °C-8 h, (e) 425 °C-4 h, (f) 450 °C-0 h, (g) 450 °C-1 h, (h) 450 °C-4 h, and (i) 500 °C-0 h.
