磷化物
超临界流体
催化作用
乙醇
木质素
氧化物
化学工程
化学
材料科学
无机化学
有机化学
工程类
作者
Tamás I. Korányi,Xiaoming Huang,Alessandro E. Coumans,Emiel J. M. Hensen
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2017-03-01
卷期号:5 (4): 3535-3543
被引量:42
标识
DOI:10.1021/acssuschemeng.7b00239
摘要
The depolymerization of lignin to bioaromatics usually requires a hydrodeoxygenation (HDO) step to lower the oxygen content. A mixed Cu-Mg-Al oxide (CuMgAlO x ) is an effective catalyst for the depolymerization of lignin in supercritical ethanol. We explored the use of Ni-based cocatalysts, i.e. Ni/SiO2, Ni2P/SiO2, and Ni/ASA (ASA = amorphous silica alumina), with the aim of combining lignin depolymerization and HDO in a single reaction step. While the silica-supported catalysts were themselves hardly active in lignin upgrading, Ni/ASA displayed comparable lignin monomer yield as CuMgAlO x . A drawback of using an acidic support is extensive dehydration of the ethanol solvent. Instead, combining CuMgAlO x with Ni/SiO2 and especially Ni2P/SiO2 proved to be effective in increasing the lignin monomer yield, while at the same time reducing the oxygen content of the products. With Ni2P/SiO2, the lignin monomer yield was 53 wt %, leading to nearly complete deoxygenation of the aromatic products.
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