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

摘要

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. (C) 2019 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.