Production of aryl oxygen-containing compounds by catalytic pyrolysis of bagasse lignin over LaTi0.2Fe0.8O3 prepared by different methods

Abstract

To realize the resource and high-value utilization, a new approach, named bagasse lignin (BL) used to produce aryl oxygen-containing compounds by catalytic pyrolysis over perovskite, was proposed. LaTi0.2Fe0.8O3 (LTF) samples prepared by the sol-gel method (SG) and the solid-state reaction method (SS) were characterized. The catalytic action on BL pyrolysis was performed by the test of TG-DTG and the evaluation of the fixed bed micro-reactor, the components and contents of the products were determined. The results show that LTF samples have cubic perovskite phase, LTF prepared by SG (LTF-SG) is porous with larger specific surface area than LTF prepared by SS (LTF-SS). During the pyrolysis of BL, the addition of LTF lowers the pyrolysis temperature and the activation energy, the contents of CO2 and CO in gaseous products reduce by 4.6%–8.0% and 30.7%–34.3%, respectively, the total content of aryl oxygen-containing compounds (including phenolics, guaiacols, syringols and phenylates) in liquid products increases from 62 wt% to more than 72 wt%, and LTF-SG shows better catalytic performance. LTF samples have nice phase and catalytic stabilities for BL pyrolysis after five successive redox cycles.