Noble-metal catalyzed hydrodeoxygenation of biomass-derived lignin to aromatic hydrocarbons

Laskar, Dhrubojyoti D.; Tucker, Melvin P.; Chen, Xiaowen; Helms, Gregory L.; Yang, Bin

doi:10.1039/c3gc42041h

Cited by 144 publications

(96 citation statements)

References 46 publications

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“…It indicated that zeolite Y dramatically improved the hydrogenolysis activity of Pd. Similar synergetic effects of acids and noble metals on lignin depolymerization were reported in previous studies (Laskar et al, 2014;Zhang et al, 2014a;Wang et al, 2015). Except for OH and -OCH3 bonds, no other O-content functional groups was found on the side chains of the products.…”

Section: Resultssupporting

confidence: 66%

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High Catalytic Efficiency of Lignin Depolymerization over Low Pd-Zeolite Y Loading at Mild Temperature

et al. 2018

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GRAPHICAL ABSTRACT | High catalytic efficiency of lignin depolymerization over low Pd-zeolite Y loading at mild temperature. This article reported a novel low-temperature process for aromatics production through lignin depolymerization catalyzed by 0.1 wt% Pd-zeolite Y catalyst prepared by a facile method. Under the same reactive condition, the as-prepared Pd-zeolite Y catalysts exhibited much higher catalytic efficiency than zeolite Y or commercial Pd/Al2O3-zeolite composites. The selectivity of the Pd-zeolite Y toward lignin depolymerization was also much higher than the other commercial zeolite-based catalysts. With the presence of hydrogen, aromatics were the predominant products with high yields of phenols and dimers (over 99%). The as-obtained aromatics can be promising feedstock for production of fuels or chemicals for various applications. Results revealed that the Pd-zeolite Y catalyst is a highly active catalyst for the cleavage of lignin interlinkages, especially the C-O-C bonds by hydrogenolysis.

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Section: Resultssupporting

confidence: 66%

“…For example, lignin degradation and/or hydrodeoxygenation reaction were reportedly enhanced by a combination of Pt, Ru, and Pd nanoparticles supported on zeolites (Laskar et al, 2014;Wang et al, 2015). However, the complexity of the preparation of these catalysts hinders their further application.…”

Section: Introductionmentioning

confidence: 99%

High Catalytic Efficiency of Lignin Depolymerization over Low Pd-Zeolite Y Loading at Mild Temperature

et al. 2018

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“…The spent alkaline liquor from deacetylation is rich in acetate and lignin, valuable components for which there are many potential pathways to produce value-added products [38]. On the other hand, the recovery and recycling of sodium within a deacetylation unit operation is an important environmental aspect of the commercialization of this process.…”

Section: Resultsmentioning

confidence: 99%

A highly efficient dilute alkali deacetylation and mechanical (disc) refining process for the conversion of renewable biomass to lower cost sugars

Chen

Shekiro

Pschorn

et al. 2014

Biotechnol Biofuels

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Background: The deconstruction of renewable biomass feedstocks into soluble sugars at low cost is a critical component of the biochemical conversion of biomass to fuels and chemicals. Providing low cost high concentration sugar syrups with low levels of chemicals and toxic inhibitors, at high process yields is essential for biochemical platform processes using pretreatment and enzymatic hydrolysis. In this work, we utilize a process consisting of deacetylation, followed by mechanical refining in a disc refiner (DDR) for the conversion of renewable biomass to low cost sugars at high yields and at high concentrations without a conventional chemical pretreatment step. The new process features a low temperature dilute alkaline deacetylation step followed by disc refining under modest levels of energy consumption.

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“…Furthermore, they found that Al 2 O 3 ‐supported noble metal catalysts were especially effective in reducing the functional groups of lignin but rather inactive for hydrogenation of the aromatic ring. For this reason, Al 2 O 3 catalysts have the potential to further improve yields and selectivity for hydrocarbons …”

Section: Methodsmentioning

confidence: 99%

Hydrotreating and hydrothermal treatment of alkaline lignin as technological valorization options for future biorefinery concepts: a review

Rutten

Ramírez

Posada

2016

J of Chemical Tech & Biotech

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Lignin has the potential to be a sustainable resource for producing biobased chemicals (e.g. phenols, aromatic hydrocarbons, vanillin) for multiple applications. However, given its heterogeneous and rigid structure, its efficient conversion to value‐added products remains one of the most important limiting factors for the successful viability of the biobased economy. Hydrotreating and hydrothermal treatment (including liquefaction, gasification and wet oxidation) are promising technologies that can convert lignin into biobased products. This review article provides a literature overview of how key process parameters of hydrotreating and hydrothermal treatment (operating conditions, catalysts, solvents, type of starting lignin) may influence the conversion of alkaline lignin into valuable chemical products. It was observed that low selectivity to products (and subsequent required separation and purification) and char formation are the main hurdles for effective conversion of alkaline lignin. However, experimental work in alternative catalytic systems, solvents and hydrogen sources has shown that promising opportunities exist to overcome these drawbacks. Certain catalysts (e.g. Ru/Al2O3) have been found to improve selectivity and the use of alcohol solvents (especially methanol or ethanol) as a hydrogen source has been found to improve product yields and reduce char formation at lower working temperatures and pressures. © 2016 Society of Chemical Industry

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Noble-metal catalyzed hydrodeoxygenation of biomass-derived lignin to aromatic hydrocarbons

Cited by 144 publications

References 46 publications

High Catalytic Efficiency of Lignin Depolymerization over Low Pd-Zeolite Y Loading at Mild Temperature

High Catalytic Efficiency of Lignin Depolymerization over Low Pd-Zeolite Y Loading at Mild Temperature

A highly efficient dilute alkali deacetylation and mechanical (disc) refining process for the conversion of renewable biomass to lower cost sugars

Hydrotreating and hydrothermal treatment of alkaline lignin as technological valorization options for future biorefinery concepts: a review

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