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Gold-catalyzed conversion of lignin to low molecular weight aromatics†
Chemical Science ( IF 8.4 ) Pub Date : 2018-09-06 00:00:00 , DOI: 10.1039/c8sc03208d Yang Song 1, 2 , Justin K Mobley 3 , Ali Hussain Motagamwala 3, 4 , Mark Isaacs 5 , James A Dumesic 3, 4 , John Ralph 3, 6 , Adam F Lee 7 , Karen Wilson 7 , Mark Crocker 1, 2
Chemical Science ( IF 8.4 ) Pub Date : 2018-09-06 00:00:00 , DOI: 10.1039/c8sc03208d Yang Song 1, 2 , Justin K Mobley 3 , Ali Hussain Motagamwala 3, 4 , Mark Isaacs 5 , James A Dumesic 3, 4 , John Ralph 3, 6 , Adam F Lee 7 , Karen Wilson 7 , Mark Crocker 1, 2
Affiliation
A heterogeneous catalyst system, employing Au nanoparticles (NPs) and Li–Al (1 : 2) layered double hydroxide (LDH) as support, showed excellent activity in aerobic oxidation of the benzylic alcohol group in β-O-4 linked lignin model dimers to the corresponding carbonyl products using molecular oxygen under atmospheric pressure. The synergistic effect between Au NPs and the basic Li–Al LDH support induces further reaction of the oxidized model compounds, facilitating facile cleavage of the β-O-4 linkage. Extension to oxidation of γ-valerolactone (GVL) extracted lignin and kraft lignin using Au/Li–Al LDH under similar conditions produced a range of aromatic monomers in high yield. Hydrolysis of the Au/Li–Al LDH oxidized lignin was found to increase the degree of lignin depolymerization, with monomer yields reaching 40% for GVL extracted lignin. Based on these results, the Au/Li–Al LDH + O2 catalyst system shows potential to be an environmentally friendly means of depolymerizing lignin to low molecular weight aromatics under mild conditions.
中文翻译:
金催化木质素转化为低分子量芳烃†
采用金纳米粒子(NPs)和Li-Al(1:2)层状双氢氧化物(LDH)作为载体的非均相催化剂体系,在β-O-4连接的木质素模型二聚体中的苯甲醇基团的有氧氧化中表现出优异的活性在大气压下利用分子氧生成相应的羰基产物。Au NPs 和碱性 Li-Al LDH 载体之间的协同效应诱导氧化模型化合物的进一步反应,促进 β-O-4 键的轻松断裂。在相似的条件下,使用 Au/Li-Al LDH 扩展对 γ-戊内酯 (GVL) 提取的木质素和硫酸盐木质素的氧化,产生了一系列高产率的芳香族单体。人们发现 Au/Li-Al LDH 氧化木质素的水解增加了木质素的解聚程度,GVL 提取的木质素的单体产率达到 40%。基于这些结果,Au/Li-Al LDH + O 2催化剂体系显示出成为在温和条件下将木质素解聚为低分子量芳烃的环保手段的潜力。
更新日期:2018-09-06
中文翻译:
金催化木质素转化为低分子量芳烃†
采用金纳米粒子(NPs)和Li-Al(1:2)层状双氢氧化物(LDH)作为载体的非均相催化剂体系,在β-O-4连接的木质素模型二聚体中的苯甲醇基团的有氧氧化中表现出优异的活性在大气压下利用分子氧生成相应的羰基产物。Au NPs 和碱性 Li-Al LDH 载体之间的协同效应诱导氧化模型化合物的进一步反应,促进 β-O-4 键的轻松断裂。在相似的条件下,使用 Au/Li-Al LDH 扩展对 γ-戊内酯 (GVL) 提取的木质素和硫酸盐木质素的氧化,产生了一系列高产率的芳香族单体。人们发现 Au/Li-Al LDH 氧化木质素的水解增加了木质素的解聚程度,GVL 提取的木质素的单体产率达到 40%。基于这些结果,Au/Li-Al LDH + O 2催化剂体系显示出成为在温和条件下将木质素解聚为低分子量芳烃的环保手段的潜力。