Reductive de-polymerization of kraft lignin with formic acid at low temperatures using inexpensive supported Ni-based catalysts

Huang, Shanhua; Mahmood, Nubla; Zhang, Yongsheng; Tymchyshyn, Matthew; Yuan, Zhongshun; Xu, Chunbao

doi:10.1016/j.fuel.2017.08.031

Cited by 48 publications

(43 citation statements)

References 21 publications

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“…The proposed mechanism consisted of four steps and is shown in Figure 7. The reductive depolymerization of kraft lignin was also examined in a water-ethanol mixture 50/50 (v/v) with formic acid as an in-situ hydrogen source, by the use of Ni-based catalysts compared to 5% Ru/C [114]. The effectiveness of the formic acid is evident even in the absence of catalysts (89 wt.% yield of liquid depolymerized lignin at 200 • C).…”

Section: Kraft Ligninsmentioning

confidence: 99%

Catalytic Transfer Hydrogenolysis Reactions for Lignin Valorization to Fuels and Chemicals

Margellou

Triantafyllidis

2019

Catalysts

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Lignocellulosic biomass is an abundant renewable source of chemicals and fuels. Lignin, one of biomass main structural components being widely available as by-product in the pulp and paper industry and in the process of second generation bioethanol, can provide phenolic and aromatic compounds that can be utilized for the manufacture of a wide variety of polymers, fuels, and other high added value products. The effective depolymerisation of lignin into its primary building blocks remains a challenge with regard to conversion degree and monomers selectivity and stability. This review article focuses on the state of the art in the liquid phase reductive depolymerisation of lignin under relatively mild conditions via catalytic hydrogenolysis/hydrogenation reactions, discussing the effect of lignin type/origin, hydrogen donor solvents, and related transfer hydrogenation or reforming pathways, catalysts, and reaction conditions.

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Section: Kraft Ligninsmentioning

confidence: 99%

Catalytic Transfer Hydrogenolysis Reactions for Lignin Valorization to Fuels and Chemicals

Margellou

Triantafyllidis

2019

Catalysts

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“…Therefore, further separation processes such as alcoholic fermentation of sugars and subsequent distillation, precipitation or chemical degradation of sugars are required to obtain lignin with high purity level. Because of the sulfonation process, catalytic depolymerization of lignin is negatively affected by the incorporation of sulfonate groups, and it continues being a challenging task [37][38].…”

Section: Sulfite Ligninmentioning

confidence: 99%

Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)

Ventura

Dómine

Chávez-Sifontes

2019

CCAT

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Valorization of lignocellulosic biomass becomes a sustainable alternative against the constant depletion and environmental problems of fossil sources necessary for the production of chemicals and fuels. In this context, a wide range of renewable raw materials can be obtained from lignocellulosic biomass in both polymeric (i.e. cellulose, starch, lignin) and monomeric (i.e. sugars, polyols, phenols) forms. Lignin and its derivatives are interesting platform chemicals for industry, although mainly due to its refractory characteristics its use has been less considered compared to other biomass fractions. To take advantage of the potentialities of lignin, it is necessary to isolate it from the cellulose/ hemicellulosic fraction, and then apply depolymerization processes; the overcoming of technical limitations being a current issue of growing interest for many research groups. In this review, significant data related to the structural characteristics of different types of commercial lignins are presented, also including extraction and isolation processes from biomass, and industrial feedstocks obtained as residues from paper industry under different treatments. The review mainly focuses on the different depolymerization processes (hydrolysis, hydrogenolysis, hydrodeoxygenation, pyrolysis) up to now developed and investigated analyzing the different hydrocarbons and aromatic derivatives obtained in each case, as well as the interesting reactions some of them may undergo. Special emphasis is done on the development of new catalysts and catalytic processes for the efficient production of fuels and chemicals from lignin. The possibilities of applications for lignin and its derivatives in new industrial processes and their integration into the biorefinery of the future are also assessed.

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“…Lignin liquefaction in hydrogen donor solvents with electric heating has also been extensively studied recently because of the high efficiency for the production of high-yield liquid fuels [57][58][59][60][61][62][63][64]. Hydrogen donor solvents could not only donate hydrogen during the lignin liquefaction process, but also have good solubility of lignin; thus, hydrogen donor solvents, coupled with catalysts, could lead to selective cleavage of C-O and C-C bonds in lignin [57].…”

Section: Conventional Lignin Liquefaction In Hydrogen Donor Solventsmentioning

confidence: 99%

“…Xu et al comparatively explored the catalytic performances of several Ni-based catalysts and Ru-based catalysts (Ru/C) during the liquefaction of kraft lignin in ethanol-water mixture (v/v of 1:1) with formic acid as a source of in situ hydrogen [61]. They found that the molecular weight of depolymerized liquid products decreased obviously with the presence of each supported metal catalysts.…”

Section: Conventional Lignin Liquefaction In Hydrogen Donor Solventsmentioning

confidence: 99%

A Review of Microwave Assisted Liquefaction of Lignin in Hydrogen Donor Solvents: Effect of Solvents and Catalysts

2018

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Lignin, a renewable source of aromatic chemicals in nature, has attracted increasing attention due to its structure and application prospect. Catalytic solvolysis has developed as a promising method for the production of value-added products from lignin. The liquefaction process is closely associated with heating methods, catalysts and solvents. Microwave assisted lignin liquefaction in hydrogen donor solvent with the presence of catalysts has been confirmed to be effective to promote the production of liquid fuels or fine chemicals. A great number of researchers should be greatly appreciated on account of their contributions on the progress of microwave technology in lignin liquefaction. In this study, microwave assisted liquefaction of lignin in a hydrogen donor solvent is extensively overviewed, concerning the effect of different solvents and catalysts. This review concludes that microwave assisted liquefaction is a promising technology for the valorization of lignin, which could reduce the reaction time, decrease the reaction temperature, and finally fulfill the utilization of lignin in a relatively mild condition. In the future, heterogeneous catalysts with high catalytic activity and stability need to be prepared to achieve the need for large-scale production of high-quality fuels and value-added chemicals from lignin.

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Reductive de-polymerization of kraft lignin with formic acid at low temperatures using inexpensive supported Ni-based catalysts

Cited by 48 publications

References 21 publications

Catalytic Transfer Hydrogenolysis Reactions for Lignin Valorization to Fuels and Chemicals

Catalytic Transfer Hydrogenolysis Reactions for Lignin Valorization to Fuels and Chemicals

Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)

A Review of Microwave Assisted Liquefaction of Lignin in Hydrogen Donor Solvents: Effect of Solvents and Catalysts

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