Catalysis of sugarcane-bagasse pyrolysis by Co, Ni, and Cu single and mixed oxide nanocomposites

Emara, Mahmoud Mohamed; Ali, Shrouq Hossam; Kassem, Taher S.; Patten, P. Gregory Van

doi:10.1007/s11051-019-4749-1

Cited by 5 publications

(1 citation statement)

References 63 publications

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“…Typically, the pyrolysis of lignin can be efficiently improved by adding catalysts such as metals (Co, Ni, Cu) and metal oxides (MgO, CaO, CuO). − However, the high cost of these methods and the difficulty in separating catalysts during the treatment process limit their widespread application. , Lignin is a polymer rich in C–C bonds, C–O bonds, and various functional groups, such as phenol hydroxyl, alcohol hydroxyl, and methoxy groups. The kind and content of chemical bonds and functional groups will significantly affect the pyrolysis process and the pyrolysis products of lignin .…”

Section: Introductionmentioning

confidence: 99%

Tunable and Functional Deep Eutectic Solvents for the Highly Selective Production of Methoxy-Free Lignin Monomers via Fast Pyrolysis

Li,

Lin,

Sun

et al. 2023

Ind. Eng. Chem. Res.

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The highly selective conversion of technical lignin to low-oxygen-content compounds is still challenging due to the presence of methoxy and ether bonds in natural lignin. Herein, tunable ternary deep eutectic solvents (DESs) containing choline chloride, oxalic acid, and another bifunctional reagent with a hydrogen-bond donor and nucleophilic function were used for the βaryl ether bond cleavage or Cα-etherification of lignin followed by pyrolysis to improve the yield of methoxy-free lignin monomers. The relationship between the lignin structure and pyrolysis behavior was investigated by 2D-NMR, FTIR, GPC, XPS, TGA, TG-FTIR, EPR, etc. The DES pretreatment changed the pathway of lignin pyrolysis toward a higher yield of bio-oil and methoxy-free products. Compared with technical lignin, the yield of phenolic products after Cα-etherification with ethanol and ethylene glycol as nucleophilic reagents increased from 0.73 × 10 11 to 4.10 × 10 11 and 5.56 × 10 11 area/mg, respectively. Besides, the introduction of ethanol and ethylene glycol is more conducive to the demethoxylation of pyrolysis products and the formation of methoxy-free phenols during pyrolysis. This work realizes the conversion of lignin to high-value phenolic products with low-oxygen-content compounds without adding catalysts by a pyrolysis strategy.

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