Carbon Modification of Nickel Catalyst for Depolymerization of Oxidized Lignin to Aromatics

Wang, Min; Zhang, Xiaochen; Li, Hongji; Lü, Jianmin; Liu, Meijiang; Wang, Feng

doi:10.1021/acscatal.7b03475

Cited by 144 publications

(98 citation statements)

References 71 publications

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“…Carbon modification of the nickel electronic properties has been used to adjust the hydrogenation/hydrogenolysis ability. Wang and co‐workers prepared a carbon‐modified nickel catalyst (Ni/MgAlOC) for the C β O hydrogenolysis of β‐O‐4 ketones ( Figure ). Ni/MgAlOC was prepared via the carbothermal reduction of Ni‐doped layered double hydroxides (Ni‐MgAl‐LDH).…”

Section: The Challengesmentioning

confidence: 99%

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Catalytic Scissoring of Lignin into Aryl Monomers

Wang

2019

Advanced Materials

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139

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Lignin is an aromatic polymer, which is the biggest and most sustainable reservoir for aromatics. The selective conversion of lignin polymers into aryl monomers is a promising route to provide aromatics, but it is also a challenging task. Compared to cellulose, lignin remains the most poorly utilized biopolymer due to its complex structure. Although harsh conditions can degrade lignin, the aromatic rings are usually destroyed. This article comprehensively analyzes the challenges facing the scissoring of lignin into aryl monomers and summarizes the recent progress, focusing on the strategies and the catalysts to address the problems. Finally, emphasis is given to the outlook and future directions of this research.

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Section: The Challengesmentioning

confidence: 99%

Section: The Challengesmentioning

confidence: 99%

Catalytic Scissoring of Lignin into Aryl Monomers

Wang

2019

Advanced Materials

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139

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“…Other studies applying similar conditions to the treatment of the biomass (e.g. 2 < t <6 h, 150 < T < 300 °C) reported the pair ‘phenol yield/catalyst’ as 25% (Ni/C), 22% (Ni/MgAlO‐C), 25% (Pd/MgO‐C), 50% (Ru/C), 19% (Ni/AC) and 47% (4%Ni‐30%W 2 C/AC) . As mentioned above, the highest monomer yields corresponded to hydrogenolysis on hardwood biomass.…”

Section: Resultsmentioning

confidence: 68%

First insights of SHVO catalyst activity for monomeric phenol production from olive pomace

Cequier

Balcells

Canela‐Garayoa

2019

J of Chemical Tech & Biotech

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BACKGROUND: Materials from renewable sources are in great demand to reduce carbon fingerprint. Olive pomace is a waste with high lignin content (>25%) and generated in high volumes. Therefore lignin from olive pomace is susceptible to be transformed into added value chemicals such as monomeric phenols through its catalytic depolymerization combining hydrogen donors (i.e. molecular hydrogen, polar protic solvents and formic acid) and catalysts based on transition metals (i.e. palladium and ruthenium supported on carbon, and SHVO catalyst, also ruthenium-based). RESULTS: The reaction conditions for the nitrogen and hydrogen experiments were temperatures of 250 and 200 ∘ C and initialpressures of 4 and 20 bar respectively. The bio-oil obtained after the catalytic process was approximately half of the initial sample weight, although somewhat lower under hydrogen conditions. The SHVO catalyst yielded 15 and 10% of monomeric phenols under nitrogen and hydrogen conditions respectively, while the other two catalysts yielded between 6 and 9% irrespective of the gas. CONCLUSION: Overall, the SHVO catalyst provided a richer mixture of phenolic compounds owing to its milder hydrogenation activity compared with the other catalysts, although at the end of the reaction the catalyst did not preserve its native form. The use of formic acid under nitrogen atmosphere was advantageous to increase the yields of phenols. The most abundant monomers in the experiments using SHVO catalyst under both atmospheres were 4-propylguaiacol, (Z)-propenylguaiacol, 4-propylsyringol, dihydroconiferyl alcohol, (Z)-propenylsyringol and dihydrosinapyl alcohol.

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“…The carbon support can also be modified to increase the catalytic activity of hydrogenolysis [98,99]. Doping the carbon support with electron donor atoms such as nitrogen should lead to (1) reduced work function of the support; (2) enhanced partial electron transfer between Ni and the support; (3) increased chemically active sites; (4) increased Ni particle dispersion.…”

Section: Monometallic Ni-based Catalysts For Hydrogenolysis Of Ligninmentioning

confidence: 99%

“…Thus, it has been shown that Ni-NDC (nitrogen doped carbon) enhanced the catalytic hydrogenolysis of lignin compared with undoped carbon supports [98]. Using NiMgAl layered double hydroxides and lignosulfonate to prepare the Ni metal catalyst supported on MgAl modified carbon support, the 3d electron distribution of surface layer Ni can be altered to promote highly selective C-O bond cleavage [99], while the Ni/C catalysts only showed high conversion but lower monomer selectivity and the mixed oxide Ni/MgAlO showed little or no activity.…”

Section: Monometallic Ni-based Catalysts For Hydrogenolysis Of Ligninmentioning

confidence: 99%

Lignin Valorizations with Ni Catalysts for Renewable Chemicals and Fuels Productions

Chen

Guan

Tsang³

et al. 2019

Catalysts

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Energy and fuels derived from biomass pose lesser impact on the environmental carbon footprint than those derived from fossil fuels. In order for the biomass-to-energy and biomass-to-chemicals processes to play their important role in the loop of the circular economy, highly active, selective, and stable catalysts and the related efficient chemical processes are urgently needed. Lignin is the most thermal stable fraction of biomass and a particularly important resource for the production of chemicals and fuels. This mini review mainly focuses on lignin valorizations for renewable chemicals and fuels production and summarizes the recent interest in the lignin valorization over Ni and relevant bimetallic metal catalysts on various supports. Particular attention will be paid to those strategies to convert lignin to chemicals and fuels components, such as pyrolysis, hydrodeoxygenation, and hydrogenolysis. The review is written in a simple and elaborated way in order to draw chemists and engineers' attention to Ni-based catalysts in lignin valorizations and guide them in designing innovative catalytic materials based on the lignin conversion reaction.Catalysts 2019, 9, 488 2 of 39 processes to play their important role in the loop of the circular economy, first, the process must be energy efficient itself [2]. Second, according to Anastas's second principle [3], atom economy should be maximized and excess starting materials which will not be contained in the final product should be avoided. Thus, developing highly active and selective catalysts and enzymes is an urgent need. Current technology for lignocellulosic valorization includes biochemical fermentation, chemical and thermochemical methods using enzymes and metal catalysts, respectively. Thermochemical methods, including combustion, pyrolysis, and gasification, and chemical methods, such as hydrodeoxygenation (HDO), hydrogenolysis, and oxidative cleavage, have the advantages of higher throughputs due to the short reaction time, and thus are more suitable for commercialized and industrialized scale-up.Woody and herbaceous biomasses are large polymeric networks consisting of ca. 35-50% cellulose, 25-30% hemicellulose (glucomannan and glucuronoxylan), and 15-30% of lignin (macromolecular polymer networks with interconnected phenylpropane and phenol units with various formula, e.g., (C 31 H 34 O 11 ) n ) by weight. Lignin is one of the most thermal stable fractions and a particularly important resource for the production of chemicals and fuels. With careful design of the metal catalysts, either aromatic platform molecules, or fuels components such as naphthenes, can be preferentially produced in high yields and with high selectivity.Over the past decade, numerous monometallic and bimetallic metal catalysts using both precious and base metal precursors on various supports have been reported to successfully convert lignin into valuable products. Transition metals such as Ni (price = US$ 12.628/kg as of April 2019) are much more economically viable than precious metals...

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Carbon Modification of Nickel Catalyst for Depolymerization of Oxidized Lignin to Aromatics

Cited by 144 publications

References 71 publications

Catalytic Scissoring of Lignin into Aryl Monomers

Catalytic Scissoring of Lignin into Aryl Monomers

First insights of SHVO catalyst activity for monomeric phenol production from olive pomace

Lignin Valorizations with Ni Catalysts for Renewable Chemicals and Fuels Productions

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