Abstract
In this paper, sepiolite (SEP) had a well-ordered pore structure, affluent surface acidity, and excellent hydrothermal stability and was used as the support to load CoO species. The acidified modified SEP (m-SEP) and as-prepared CoO/m-SEP catalysts were included in the lignin depolymerization reaction under supercritical methanol. m-SEP and CoO/m-SEP were characterized by Inductively Coupled Plasma Optical Emission Spectroscopy, powdered X-ray diffraction, NH3 temperature programmed desorption, scanning electron microscopy, energy-dispersive X-ray spectroscopy elemental analysis, and N2 isothermal adsorption. The results revealed that CoO/m-SEP had appropriate surface acidity and a larger pore diameter than m-SEP. As expected, CoO/m-SEP showed the highest degree of lignin liquefaction (74.25%) and yield of the petroleum ether soluble product (8.18%) as well as the lowest char yield (11.23%) under the same reaction conditions. In addition, the effect of reaction temperature on the degradation of lignin was investigated over the CoO/m-SEP catalyst under supercritical methanol. It found that increasing the reaction temperature would promote the lignin depolymerization, while excessively high temperature would lead to severe repolymerization.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call