Hydrodeoxygenation of lignin-derived phenolic compounds over bi-functional Ru/H-Beta under mild conditions

Yao, Gang; Wu, Guangjun; Dai, Weili; Guan, Naijia; Li, Landong

doi:10.1016/j.fuel.2015.02.035

Cited by 185 publications

(88 citation statements)

References 36 publications

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“…Thus, there is a substantial increase in the amount of phenolic OH, most likely because of the cleavage of the β‐O‐4 ether linkage to produce a phenolic OH and an alkane, which is the main reaction of lignin depolymerisation. The decrease of aliphatic hydroxyl OH was caused by the dehydration and hydrogenation or simple HDO effect of the metal catalysts as was found by other researchers . The DLs with more phenolic OH groups are more applicable for the synthesis of phenol‐formaldehyde and epoxy resin.…”

Section: Resultsmentioning

confidence: 54%

Reductive Depolymerization of Kraft and Organosolv Lignin in Supercritical Acetone for Chemicals and Materials

Yuan

Tymchyshyn

2016

ChemCatChem

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Kraft and organosolv lignin (KL and OL) were depolymerised efficiently in supercritical acetone in the presence of various hydrogenation catalysts (supported metal, e.g., Ni, Ru, Mo, W) and 100 bar hydrogen in the temperature range of 250–350 °C. Under the optimal conditions with Ru/C or FHUDS‐2 catalysts at 350 °C for 1 h, the yield of depolymerised Kraft lignin (DKL) or depolymerised organosolv lignin (DOL) was over 95 wt %. The weight average molecular weight of the lignin was reduced significantly from 10 200 (for KL) to 1020 g mol−1 (DKL) and from 2600 (OL) to 900 g mol−1 (DOL). The oxygen and sulfur contents of Kraft lignin were reduced by 24 and 96 %, respectively. The reductive depolymerisation treatment also decreased the amount of aliphatic hydroxyl groups and increased the amount of aromatic hydroxyl groups in the depolymerised lignin products.

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Section: Resultsmentioning

confidence: 54%

Reductive Depolymerization of Kraft and Organosolv Lignin in Supercritical Acetone for Chemicals and Materials

Yuan

Tymchyshyn

2016

ChemCatChem

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“…Zhang also reported HDO at 200 °C using the combination of a supported Co‐based catalyst with H‐ZSM‐5 zeolite . Further reduction in the reaction temperature to 130–150 °C was achieved by Chen and Dyson using Ru/H‐zeolites and a catalyst system based on Rh/Ru nanoparticles with acid‐functionalized imidazolium salts, respectively. However, these catalyst systems still require high‐pressure H 2 gas (2‐5 MPa).…”

Section: Methodsmentioning

confidence: 95%

Hydrodeoxygenation of Phenols to Form Cyclohexanes Catalyzed by Pt/H‐beta in Ester Solvents under Mild Conditions

et al. 2017

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We have previously reported hydrodeoxygenation (HDO) of phenols to form cyclohexanes at 110 °C under ambient H2 pressure by using Pt/H‐ZSM‐5 catalyst and octane as a solvent; however, the low solubility of some phenols in octane is a major problem for expanding the scope of this reaction. Herein, we report that Pt/H‐beta catalyzes the HDO using ester solvents which dissolve a wide range of phenols. The difference in HDO performance between the catalyst systems, Pt/H‐beta in esters and Pt/H‐ZSM‐5 in octane, was also investigated. Furthermore, we have demonstrated that HDO of a phenol proceeds at 85 °C by Pt/H‐beta in an ester solvent.

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“…As the reaction increased to 240 ºC, the high heat transfer efficiency and high content of the hydrogen radical of the supercritical ethanol system could ensure the energy needed for the depolymerization reaction and inhibit the repolymerization reaction (Riaz et al 2016). However, as the depolymerization temperature increased to 300 ºC, the depolymerization reaction rate occurred too quickly, and formed a large amount of depolymerization intermediate radicals, leading to a higher probability of the repolymerization reaction occurring, and a decrease in the liquid oil yield (Yao et al 2015). As the Raney/Ni or Rh/C catalysts were added to the depolymerization system, the hydrogenation of the depolymerization intermediates was promoted, which led to the decreased probability of the repolymerization reaction .…”

Section: Effect Of Reaction Conditions On the Yields Of Depolymerizatmentioning

confidence: 99%

“…However, the efficient conversion of lignin into bio-chemicals is challenging because of the high structural heterogeneity of lignin biopolymers and their recalcitrance to depolymerization. More and more researchers have been trying to find efficient methods for depolymerization of lignin to produce bio-based mono-phenol chemicals and other value-added chemicals (Jiang et al 2015;Kim et al 2015a;Yao et al 2015). Guo et al (2017).…”

Section: Introductionmentioning

confidence: 99%

Catalytic Depolymerization of Alkali Lignin in Sub- and Super-critical Ethanol

Guo¹,

Liu²,

Tang³

et al. 2017

BioResources

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The effects of reaction parameters on catalytic depolymerization of alkali lignin in sub-and super-critical ethanol were investigated using a high pressure autoclave, and the liquid oil and solid char products were characterized. The experimental data indicated that Rh catalysis, controlling reaction conditions at ethanol critical temperature (240 ºC) and pressure (7.0 MPa), high ethanol/water ratios (100/0), and the medium reaction time (4 h) enhanced the depolymerization of alkali lignin to liquid oil and decreased the char formation. A gas chromatography/mass spectroscopy (GC/MS) analysis showed that the main compositions of liquid oils were phenols, esters, ketones, and acid compounds, and the supercritical state favored the formation of bio-phenols, but the subcritical state improved the generation of bio-esters. Scanning electron microscopy (SEM) and Fourier transform infrared spectrometer (FTIR) spectra analysis showed that the addition of the Raney/Ni and Rh/C catalysis could inhibit the re-fusion of alkali lignin micron-sized spheres in the supercritical ethanol, which led to an increase in the occurrence of the depolymerization reactions.

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Hydrodeoxygenation of lignin-derived phenolic compounds over bi-functional Ru/H-Beta under mild conditions

Cited by 185 publications

References 36 publications

Reductive Depolymerization of Kraft and Organosolv Lignin in Supercritical Acetone for Chemicals and Materials

Reductive Depolymerization of Kraft and Organosolv Lignin in Supercritical Acetone for Chemicals and Materials

Hydrodeoxygenation of Phenols to Form Cyclohexanes Catalyzed by Pt/H‐beta in Ester Solvents under Mild Conditions

Catalytic Depolymerization of Alkali Lignin in Sub- and Super-critical Ethanol

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