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Nonprecious Metal/Bimetallic Catalytic Hydrogenolysis of Lignin in a Mixed-Solvent System
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-12 , DOI: 10.1021/acssuschemeng.0c05362 Chongbo Cheng 1 , Pengfei Li 1 , Wenbing Yu 1 , Dekui Shen 1 , Xiaoxiang Jiang 2 , Sai Gu 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-12 , DOI: 10.1021/acssuschemeng.0c05362 Chongbo Cheng 1 , Pengfei Li 1 , Wenbing Yu 1 , Dekui Shen 1 , Xiaoxiang Jiang 2 , Sai Gu 3
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Lignin containing numerous phenylpropane units is considered to be a renewable and abundant resource for the production of value-added aromatic chemicals. A series of nonprecious metal/bimetallic catalysts were prepared for the catalytic hydrogenolysis of organosolv poplar lignin (OPL) in ethanol/isopropanol solvent in this work. Effects of Ni/C, Cu/C, NiCu/C, and NiW/C catalysts on OPL depolymerization were investigated, where the NiCu/C catalyst was found to be optimal for the conversion of OPL to phenolic monomers at a yield of 63.4 wt % at 270 °C for 4 h without external H2. The synergistic effect of mixed solvent was remarkable during the catalytic hydrogenolysis process, leading to the increased yield of monomer products. The catalytic process of OPL conversion and possible reaction route of ethanol/isopropanol solvent were proposed with regard to the analysis of products and fresh/spent catalysts. The effects of reaction temperature, reaction time, catalyst recyclability, solvent recyclability, and feedstock adaptability were investigated in view of bio-oil and monomer yields. This work provides an economical and sustainable method for the efficient conversion of lignin to high-value chemicals.
中文翻译：
混合溶剂体系中木质素的非贵金属/双金属催化氢解
含有大量苯丙烷单元的木质素被认为是生产增值芳香族化学品的可再生资源。制备了一系列非贵金属/双金属催化剂，用于有机溶剂杨木木质素（OPL）在乙醇/异丙醇溶剂中的催化氢解。研究了Ni / C，Cu / C，NiCu / C和NiW / C催化剂对OPL解聚的影响，发现NiCu / C催化剂最适合以63.4 wt％的产率将OPL转化为酚类单体％在270°C下放置4小时，无外部H 2。在催化氢解过程中，混合溶剂的协同作用显着，导致单体产物的收率提高。针对产物和新鲜/废催化剂的分析，提出了OPL转化的催化过程和乙醇/异丙醇溶剂可能的反应路线。考虑到生物油和单体的收率，研究了反应温度，反应时间，催化剂可循环性，溶剂可循环性和原料适应性的影响。这项工作为将木质素有效转化为高价值化学品提供了一种经济且可持续的方法。
更新日期：2020-11-02
中文翻译：
混合溶剂体系中木质素的非贵金属/双金属催化氢解
含有大量苯丙烷单元的木质素被认为是生产增值芳香族化学品的可再生资源。制备了一系列非贵金属/双金属催化剂，用于有机溶剂杨木木质素（OPL）在乙醇/异丙醇溶剂中的催化氢解。研究了Ni / C，Cu / C，NiCu / C和NiW / C催化剂对OPL解聚的影响，发现NiCu / C催化剂最适合以63.4 wt％的产率将OPL转化为酚类单体％在270°C下放置4小时，无外部H 2。在催化氢解过程中，混合溶剂的协同作用显着，导致单体产物的收率提高。针对产物和新鲜/废催化剂的分析，提出了OPL转化的催化过程和乙醇/异丙醇溶剂可能的反应路线。考虑到生物油和单体的收率，研究了反应温度，反应时间，催化剂可循环性，溶剂可循环性和原料适应性的影响。这项工作为将木质素有效转化为高价值化学品提供了一种经济且可持续的方法。
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