Synthesis-Controlled α- and β-Molybdenum Carbide for Base-Promoted Transfer Hydrogenation of Lignin to Aromatic Monomers in Ethanol

Wu, Kejing; Yang, Chunyan; Zhu, Yingming; Wang, Junbo; Wang, Xueting; Liu, Changjun; Liu, Yingying; Lu, Houfang; Liang, Bin; Li, Yongdan

doi:10.1021/acs.iecr.9b04910

Cited by 33 publications

(22 citation statements)

References 44 publications

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“…Crystal phase of molybdenum carbide can significantly influence the catalytic activity. Different Mo 2 C crystal phases can be obtained under different carburization atmospheres and temperatures [ 215 ]. Under CH 4 /H 2 , a gradual increase of process temperature resulted in the gradual transformation of MoO 2 phase to α-MoC 1−x .…”

Section: Lignin Hydrogenolysis To Valuable Phenolic Compoundsmentioning

confidence: 99%

Carbon-Based Nanocatalysts (CnCs) for Biomass Valorization and Hazardous Organics Remediation

et al. 2022

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The continuous increase of the demand in merchandise and fuels augments the need of modern approaches for the mass-production of renewable chemicals derived from abundant feedstocks, like biomass, as well as for the water and soil remediation pollution resulting from the anthropogenic discharge of organic compounds. Towards these directions and within the concept of circular (bio)economy, the development of efficient and sustainable catalytic processes is of paramount importance. Within this context, the design of novel catalysts play a key role, with carbon-based nanocatalysts (CnCs) representing one of the most promising class of materials. In this review, a wide range of CnCs utilized for biomass valorization towards valuable chemicals production, and for environmental remediation applications are summarized and discussed. Emphasis is given in particular on the catalytic production of 5-hydroxymethylfurfural (5-HMF) from cellulose or starch-rich food waste, the hydrogenolysis of lignin towards high bio-oil yields enriched predominately in alkyl and oxygenated phenolic monomers, the photocatalytic, sonocatalytic or sonophotocatalytic selective partial oxidation of 5-HMF to 2,5-diformylfuran (DFF) and the decomposition of organic pollutants in aqueous matrixes. The carbonaceous materials were utilized as stand-alone catalysts or as supports of (nano)metals are various types of activated micro/mesoporous carbons, graphene/graphite and the chemically modified counterparts like graphite oxide and reduced graphite oxide, carbon nanotubes, carbon quantum dots, graphitic carbon nitride, and fullerenes.

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Section: Lignin Hydrogenolysis To Valuable Phenolic Compoundsmentioning

confidence: 99%

Carbon-Based Nanocatalysts (CnCs) for Biomass Valorization and Hazardous Organics Remediation

et al. 2022

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“…In addition, carbonized MOFs contain active metal NPs derived from metal ions in the framework, which are more suitable for heterogeneous catalysis. One area where carbonized MOFs are widely used as catalysts is the HDO of lignin 12,41,82–84 . When pristine MOFs are used, the catalytic reactions must be carried out under mild conditions, i.e ., low temperature and pressure, because of the low thermal and chemical stabilities of the MOFs.…”

Section: Production Of Porous Carbon‐supported Metal Catalysts Througmentioning

confidence: 99%

“…There are many types of catalysts for the conversion of biomass derivatives. Noble metal nanoparticles (NPs), [8][9][10] transition metal carbides, [11][12][13] transition metal oxides, [14][15][16] and zeolites 17,18 have all been used for different catalytic reactions. In this review, the advantages of metal-organic frameworks (MOFs) as biomass conversion catalysts are presented.…”

Section: Introductionmentioning

confidence: 99%

“…Because of its high CN(12), UiO-66 has high chemical, thermal, and mechanical stability, and, during the CTH reaction, the structure of UiO-66 was maintained (no collapse) over five recycling tests at a high temperature of 200 C; further, 100% EL conversion and 90% GVL yield were obtained. Figure3ashows UiO-66-based catalysts containing benzenedicarboxylate (BDC) organic linkers with either carboxylic acid or amino functional groups.…”

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confidence: 99%

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Modified Metal–Organic Frameworks as Efficient Catalysts for Lignocellulosic Biomass Conversion

Lee

Nam

2021

Bulletin Korean Chem Soc

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Biomass, a promising replacement for fossil fuels, can be used to produce eco‐friendly liquid fuels and chemicals. Various studies are investigating catalysts for lignocellulosic biomass conversion to valuable chemicals and fuels. Metal–organic frameworks (MOFs) are important catalysts because of their well‐ordered porous structures and large surface areas. Although MOFs can be applied directly, four modification strategies can be used to alter their catalytic properties and improve catalytic performance. In the first strategy, coordinatively unsaturated sites are created by changing the bonding state of the metal node. In the second approach, organic linkers with additional functional groups or active elements are used. In the third strategy, MOFs and other active elements are combined. In the final approach, MOFs are carbonized to produce carbon‐supported metal catalysts. We review the applications of modified MOFs for the catalytic conversion of biomass derivatives and discuss the factors that contribute to their improved catalytic performance.

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“…Therefore, a heterogeneous catalyst is often used in lignin solvolysis. For example, Kraft lignin was depolymerized in various solvents under inert atmosphere using Pt/Al 2 O 3 [24], Mo x C/C [25][26][27], Mo 2 N/Al 2 O 3 [28], Pd/C [29], Cu-Mo/ZSM5 zeolite [30] and Ni-Re/Nb 2 O 5 [31]. The yields in monomers depend on different reaction parameters: temperature, solvent, reaction time, catalyst loading.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Liquefaction of Kraft Lignin with Solvothermal Approach

et al. 2021

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Lignin is a natural biopolymer present in lignocellulosic biomass. During paper pulp production with the Kraft process, it is solubilized and degraded in Kraft lignin and then burned to recover energy. In this paper, the solvolysis of Kraft lignin was studied in water and in water/alcohol mixtures to produce oligomers and monomers of interest, at mild temperatures (200–275 °C) under inert atmosphere. It was found that the presence of alcohol and the type of alcohol (methanol, ethanol, isopropanol) greatly influenced the amount of oligomers and monomers formed from lignin, reaching a maximum of 48 mg·glignin−1 of monomers with isopropanol as a co-solvent. The impact of the addition of various solid catalysts composed of a metal phase (Pd, Pt or Ru) supported on an oxide (Al2O3, TiO2, ZrO2) was investigated. In water, the yield in monomers was enhanced by the presence of a catalyst and particularly by Pd/ZrO2. However, with an alcoholic co-solvent, the catalyst only enhanced the formation of oligomers. Detailed characterizations of the products with FTIR, 31P-NMR, 1H-NMR and HSQC NMR were performed to elucidate the chemical transformations occurring during solvolysis. The nature of the active catalytic specie was also investigated by testing homogeneous palladium catalysts.

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Synthesis-Controlled α- and β-Molybdenum Carbide for Base-Promoted Transfer Hydrogenation of Lignin to Aromatic Monomers in Ethanol

Cited by 33 publications

References 44 publications

Carbon-Based Nanocatalysts (CnCs) for Biomass Valorization and Hazardous Organics Remediation

Carbon-Based Nanocatalysts (CnCs) for Biomass Valorization and Hazardous Organics Remediation

Modified Metal–Organic Frameworks as Efficient Catalysts for Lignocellulosic Biomass Conversion

Catalytic Liquefaction of Kraft Lignin with Solvothermal Approach

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