Production of phenolic compounds in catalytic pyrolysis of bagasse lignin in the presence of Ca0.5Pr0.5FeO3

Herein, sodium dodecylbenzene sulfonate (SDBS) was used as a template to control the synthesis of Ca 0.5 Pr 0.5 FeO 3 . Its microstructure, composition, and morphology were detected via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The properties of catalyzing bagasse lignin (BL) pyrolysis were determined by thermogravimetric analysis (TG) test and evaluation of a fixed bed alumina microreactor. The results show that the sample Ca 0.5 Pr 0.5 FeO 3 regulated by SDBS has a cubic crystal phase, and the addition of SDBS does not cause phase transition. Moreover, when the SDBS concentration is 0.10 mol/L, the particle size is 200–500 nm and the specific surface area is 11.26 m 2 /g. The yields of gas, liquid, and solid products in the BL catalytic pyrolysis are 39.58 wt%, 26.76 wt% and 32.36 wt%, respectively. The contents of CO 2 and CO decrease from 54.07% and 4.98% to 45.29% and 3.23%, respectively. The liquid products are mainly guaiacol, syringol, and phenol, and the total selectivity of phenols is 83.67%, accompanied by a small amount of non-aromatic oxygen-containing compounds (five-membered ring (furan) or ester). Compared with the BL pyrolysis and Ca 0.5 Pr 0.5 FeO 3 catalytic pyrolysis products, the selectivity of guaiacol compounds increases by 43.26%, while those of syringol compounds and phenylketones decrease by 30.08% and 3.39%, respectively. The selectivity of 2,6-dimethoxyphenol is 28.37%. After five catalytic pyrolysis-regeneration cycles, the characteristic peaks of the catalyst do not change significantly and the particles are uniform, suggesting that the catalyst has good crystal phase stability and regeneration stability. For the catalytic pyrolysis of BL via CPF-0.5, the main products are phenols, guaiacols, syringols, phenylketones, phenylethers and other compounds, moreover, the selectivity of guaiacols increases by 43.26%. • The pore structure of CPF-0.5 can be regulated with the addition of SDBS. • CPF-0.5-SDBS inhibited decarboxylation and decarbonylation reaction in the catalytic pyrolysis of BL. • CPF-0.5-SDBS improved the selectivity of guaiacol compounds in liquid products.