Fig. 1From: Sequential catalytic lignin valorization and bioethanol production: an integrated biorefinery strategya Plot of H/C ratio versus O/C ratio of the lignin oil obtained by RCF with different ratios of 2-PrOH:H2O (v/v) in initial liquor. b 31P-NMR spectrums of the lignin oil. c Molecular weight distribution, and d the lignin monomers yield of the RCF oil with different ratios of 2-PrOH/H2OBack to article page