Degradation on hydrogenolysis of soda lignin using CuO/SO 4 2− /ZrO 2 as catalyst

Zhang, Shengming; Su, Ling; Liu, Liang; Gui-zhen, Fang

doi:10.1016/j.indcrop.2015.07.039

Cited by 29 publications

(39 citation statements)

References 27 publications

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“…The 2D-HSQC spectra of SL and Catalyzed-SL are depicted in Figure 3. Based on recent studies [8,24,25], the detailed assignments of 13 The signals in the range of δC/δH 100.0/8.00 to δC/δH 140.0/6.00 ppm can be used to determine the aromatic rings of lignin units. The signal of C2-H2 at δC/δH 104.3/6.73 ppm was assigned to the S unit.…”

Section: Characterization Of Productsmentioning

confidence: 99%

“…The 2D-HSQC spectra of SL and Catalyzed-SL are depicted in Figure 3. Based on recent studies [8,24,25], the detailed assignments of 13 In addition, the 1 H-NMR spectra of SL and Catalyzed-SL were depicted in Figure 4. The content of OCH3 group of lignin samples was determined based on 1 H-NMR spectra [27].…”

Section: Characterization Of Productsmentioning

confidence: 99%

“…In our previous studies, a series of acid and metal catalysts were developed to degrade lignin through hydrogenolysis routes. After the reaction, the reactivity of the soda lignin was greatly improved: A 55.2%-63.0% increase in the total hydroxyl content, a 13.9%-29.4% increase in the content of phenol hydroxyl, and an approximately 10.0% decrease in oxygen content [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, the self-made catalyst SO 4 2− /ZrO 2 solid acid and the metal catalyst CuO/SO 4 2− /ZrO 2 were found to degrade and activate soda lignin at 90-120 • C [8][9][10]. Coincidentally, the temperature of ionic liquid [BMIM]Cl used for biomass extraction and conversion was in the range of 75-150 • C [11,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogenolysis and Activation of Soda Lignin Using [BMIM]Cl as a Catalyst and Solvent

et al. 2017

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Abstract:To improve the reactivity of the soda lignin, an acid ionic liquid 1-butyl-3-mthylimidazolium chloride ([BMIM]Cl) was used as the catalyst and solvent to degrade the soda lignin through hydrogenolysis. Structural elucidation of the lignin samples was conducted by using a combination of analytical methods including chemical analysis, ultraviolet spectrophotometry (UV spectrophotometry), Fourier transform infrared spectroscopy (FT-IR spectra), two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance (2D-HSQC NMR) techniques, and gel permeation chromatography (GPC). The antioxidant activities of the lignin samples were evaluated using the diammonium 2,2 -azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS + ) radical scavenging and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging methods. The degradation mechanism was proposed based on the characterization results. The optimal reaction condition was as follows: the concentration of [BMIM]Cl in the solution was 10 wt %, the hydrogen initial pressure was 3 MPa, and the solution was heated for 4 h at 90 • C. After the reaction, the total hydroxyl content of the soda lignin increased by 81.3%, while the phenolic hydroxyl content increased by 23.1%. At the same time, the weight-average molar mass of the soda lignin sample decreased from 8220 to 6450 g/mol with an improved antioxidant activity. In addition, approximately 56.7% of the β-O-4 linkages were degraded in the lreaction. The main effect of the acid ionic liquid [BMIM]C1 was related to the cleavage of β-O-4 linkages. This study has shown the potential of using the catalyzed soda lignin as a natural polymer antioxidant.

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Section: Characterization Of Productsmentioning

confidence: 99%

Section: Characterization Of Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogenolysis and Activation of Soda Lignin Using [BMIM]Cl as a Catalyst and Solvent

et al. 2017

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“…There has been extensive industrial and academic research on lignin depolymerisation, although it is difficult to degrade using either chemical or biological methods (Wu et al 2005). Various methods, including thermochemical, ionic liquid, hygrogenolysis (Zhang et al 2015b), photocatalysis , microwave assisted technology (Dong et al 2014;Ouyang et al 2015a), and catalytic reduction/degradation have been explored to make lignin a value-added fuel (Zakzeski et al 2010;Snowdon et al 2014). Catalytic reduction/degradation methods are expected to make lignin a high-grade biofuel under gentle and environment friendly conditions (Bouxin et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Chen

Yan

2017

BioResources

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A graphene/hemin (H-GN) catalyst for lignin degradation was prepared by a wetchemistry method with graphene oxide and hemin. Hemin was absorbed onto the graphene surface through π-π interaction. Graphene served as a supporting material for hemin, providing a large contact area between the active molecules of catalyst and substrate, as well as protecting hemin from self-oxidation and maintaining its active molecules. The H-GN catalyst showed high catalytic efficiency in the degradation of alkaline lignin under gentle conditions. At pH 13.0, the degradation rate was 49.7% with H-GN and H2O2 (mass ratio of H2O2 to lignin of 10:1) under 60 °C, which was higher than 34.9% for non-catalyst degradation. At pH 13.2, it was as high as 92.9 wt.% at 100 °C. The lignin was decomposed into small molecules with styrene as the main final product below pH 13 and with the major products of 4-hydroxy-4-methyl-2-pentanone and bis(2-ethylhexyl) phthalate at pH 13.2.

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Layer‐by‐layer self‐assembly of a lignin–poly(vinyl alcohol) based polyelectrolyte with a conductivity method

Zhang

Jiang

et al. 2016

J of Applied Polymer Sci

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In this study, we made a new attempt to examine the relationship between the conductivity and the concentration of a polyelectrolyte solution and to prepare multilayer films with cationic lignin and polyanions through layer-by-layer self-assembly. The nitrogen content of trimethyl lignin quaternary amine salt (TLQA) was 3.56%, and the carboxyl content of carboxymethylated poly (vinyl alcohol) (CMPVA) was 0.62 mmol/g. Attenuated total reflectance spectra confirmed that TLQA and CMPVA were fabricated and assembled successfully. The concentration of TLQA had a polynomial correlation with the conductivity [correlation coefficient (R 2 ) 5 0.9953], and the concentration of CMPVA was linear with the conductivity (R 2 5 0.9819). The electrostatic sequential adsorption process was monitored with a UV-visible spectrophotometer, and the morphology of the (TLQA/CMPVA) n (where n is the number of double membranes) multilayer film was observed by atomic force microscopy and scanning electron microscopy. When the absorbance of the (TLQA/CMPVA) n multilayer film increased linearly, the linear equation was y 5 0.0267x 1 0.07453 and R 2 was 0.9735. When five layers of TLQA and CMPVA were assembled, the surface root mean square roughness of TLQA and CMPVA were 21.07 and 65.28 nm, respectively. When the number of layers increased, the film surface roughness increased. The stability of the multilayer films in aqueous solution was determined by a conductivity meter. The (TLQA/CMPVA) n multilayer film was stable in water. The results of the research demonstrate for the first time that TLQA and CMPVA could be assembled and successfully driven by electrostatic forces.

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Degradation on hydrogenolysis of soda lignin using CuO/SO 4 2− /ZrO 2 as catalyst

Cited by 29 publications

References 27 publications

Hydrogenolysis and Activation of Soda Lignin Using [BMIM]Cl as a Catalyst and Solvent

Hydrogenolysis and Activation of Soda Lignin Using [BMIM]Cl as a Catalyst and Solvent

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Layer‐by‐layer self‐assembly of a lignin–poly(vinyl alcohol) based polyelectrolyte with a conductivity method

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