解聚
催化作用
化学
氢氧化钠
溶剂
解吸
核化学
木质素
吸附
无机化学
有机化学
作者
Zhiyuan Sheng,Lishu Shao,Lin Zhang,Peng Zhan,Zhiping Wu
标识
DOI:10.1002/slct.202202575
摘要
Abstract The catalytic oxidative depolymerization is one of the main means for lignin depolymerization to produce various value‐added chemicals, such as ketones, aldehydes and organic acids, et al. However, the high‐efficiency cleavage of lignin interlinkage is often challenging due to the high recalcitrance of C−C bonds and the weak activity of catalyst. Herein, a series of modified sepiolite (m‐Sep) supported metal oxide catalysts (M x O/m‐Sep) were prepared by the precipitation method with assistance of ultrasonic wave, and firstly used in the oxidative depolymerization of sodium lignosulfonate (SLS). Three M x O /m‐Sep catalysts (Cu x O, Co x O, and Fe x O) were characterized by SEM, TEM, XRD, N 2 adsorption‐desorption, FT‐IR, XPS, and O 2 ‐TPD to study their microstructure and surface chemical state. The effect of the reaction conditions (temperatures, O 2 initial pressure, and time) for the oxidative depolymerization of SLS in H 2 O solvent were investigated over Cu x O/m‐Sep catalyst, respectively. Correspondingly, the orthogonal experiment was also performed for obtaining the optimal depolymerization conditions. The results indicated the conversion rate of SLS could reach the highest value of 99.2 wt% under 1 MPa O 2 at 210 °C for 4 h, and the optimal yield rate of ethyl acetate‐soluble products (EA‐soluble products) was 11.1 wt%. All these EA‐soluble products were analyzed by GC‐MS, and the selective esters including diethyl maleate (18.41 %) and diethyl succinate (22.91 %) could be obtained over Cu x O/m‐Sep catalyst under the optimal reaction conditions. In addition, Co x O/m‐Sep and Fe x O/m‐Sep also exhibited comparable catalytic performance for SLS. This work developed a new approach for the effective oxidative depolymerization of SLS with low‐cost catalysts and mild conditions, and provided references for the production of lignin‐derived high‐value chemicals.
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