Efficient lignin conversion over Ni/(Fe/Zn/Co/Mo/Cu)–WO3/Al2O3for selectively yielding alkyl phenols

Lu, Xinyu; Gu, Xiaoli

doi:10.1039/d2cy01800d

Cited by 8 publications

(3 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Comparison of monometallic and bimetallic catalysts (Tables , entries 1 and 4–7) revealed that doping of Ni and Fe metals led to a decrease in the selectivity of single product A (from 47.68 to 34.92% and 18.44%) but generated highly selective G7 and G3 products (Figure S1). This is due to the fact that different metal sites act differently and promote the generation of different products . 1%Co-1%Pd@NDCS showed the highest selectivity for the single product with a yield of 22.13 wt % and a selectivity of up to 60.83% (Table , entry 4).…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the fact that different metal sites act differently and promote the generation of different products. 40 1%Co-1%Pd@NDCS showed the highest selectivity for the single product with a yield of 22.13 wt % and a selectivity of up to 60.83% (Table 1, entry 4). In summary, the bimetallic catalysts outperformed the monometallic catalysts, and Co−Pd@NDCS had the best catalytic performance and selectivity, which was subsequently used as a catalyst for the optimization of process conditions.…”

Section: Catalytic Hydrogenolysis Of Ligninmentioning

confidence: 99%

See 1 more Smart Citation

Sustainable Production of High-Value Chemicals from Selective Hydrogenolysis of Lignin Catalyzed by Co–Pd Bimetallic Supported on Nitrogen-Doped Carbon Spheres

Liang,

Fu,

Qiu

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

The production of fuel and chemicals from renewable lignin supplies a sustainable chemical engineering process. In this study, Co−Pd bimetallic supported on porous polymer-derived nitrogen-doped carbon spheres (NDCS) was employed for the selective hydrogenolysis of organosolv lignin. Most of the products are phenolic monomers. At optimal conditions, 2.5 MPa H 2 , 280 °C for 5 h, 86.74% liquefaction of lignin and 36.38 wt % yield of phenolic monomers were obtained. Among these monomer products, 60.83% were identified as 4-hydroxy-3,5dimethoxyphenylacetic acid (22.13 wt % yield), which is an important pharmaceutical intermediate. With the help of the characterization of catalysts and hydrogenolysis products, the reaction mechanism was proposed. The NDCS provided the prerequisites for metal anchoring and dispersion, and smaller metal particle sizes (2.56 nm) were obtained compared to those of undoped nitrogen carriers. Meanwhile, the synergistic interaction between Pd 0 and Co 0 promoted the conversion of active hydrogen. With active hydrogen, the C−C and C−O bonds in the lignin were cleaved, and then the active O was transferred to the Pd 2+ and Co 2+ sites and catalyzed the oxidation of 4-allyl-2,6-dimethoxyphenol to 4-hydroxy-3,5dimethoxyphenylacetic acid. Lastly, cycling experiments demonstrated the remarkable stability of the catalyst.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Catalytic Hydrogenolysis Of Ligninmentioning

confidence: 99%

Sustainable Production of High-Value Chemicals from Selective Hydrogenolysis of Lignin Catalyzed by Co–Pd Bimetallic Supported on Nitrogen-Doped Carbon Spheres

Liang,

Fu,

Qiu

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Lignin, as one of the abundant natural renewable resources, has been extensively researched in the field of fabricating aromatic products, biodegradable materials, and liquid fuels due to the specificity of its composition and structure. − It has been found that lignin consists of coumarin (H), mustard alcohol (S), and pineal (G) groups, which are randomly connected by C–C/C–O bonds (4-O-5, α-O-4, β-O-4, β–β, β-1, etc.) to form natural aromatic polymer compounds with complex three-dimensional networks. − In recent years, on the strength of the structural characteristics of lignin, it has been extensively demonstrated that lignin catalytic depolymerization (LCD) for liquid fuels and cooperative production of phenolic monomers is one of the promising methods for highly efficient utilization of lignin. , …”

Section: Introductionmentioning

confidence: 99%

Lignin Catalytic Depolymerization for Guaiacols and Alkylphenols over Co–Zr/Sepiolite under Supercritical Ethanol

Chen,

Zhou,

Wang

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

Lignin catalytic depolymerization (LCD) in supercritical ethanol for the preparation of liquid fuels and phenolic monomers is one of the promising strategies for the valorization of lignocellulosic biomass. This paper reported sepiolite (SEP)-supported Co−Zr catalysts (Co−Zr/SEP) with different Co/Zr ratios for LCD in supercritical ethanol. The characterization results revealed that the cobalt oxides interacted with the SEP framework to create abundant pores, which increased the accessibility of the active sites with lignin fragments. Furthermore, the Zr additive promoted the conversion of Co(OH) 2 to Co 3 O 4 to increase Lewis acid sites (LAS) and oxygen vacancies (V O ), which could enhance the adsorption and stabilization of reactive intermediates. Among the samples, 3Co1Zr/SEP exhibited the superior surface area and the highest LAS and abundant V O . The experimental results showed that the Co/Zr ratio significantly affected the yields of liquid products and phenolic monomers, and 3Co1Zr/SEP achieved the outstanding liquid product yield (60.11%) and the optimal yields of guaiacols (445.2 mg/g lignin) and alkylphenols (109.8 mg/g lignin) under the optimal reaction conditions. Additionally, 3Co1Zr/SEP significantly reduced the apparent activation energy for breaking β-O-4 bonds to 71.46 from 89.94 kJ• mol −1 over SEP by model experiments; furthermore, the possible reaction pathways of LCD over 3Co1Zr/SEP were proposed.

show abstract

Heterogeneously Catalyzed Reductive Depolymerization of Lignin to Value‐Added Chemicals

Yu,

Kong,

Liang

et al. 2024

ChemSusChem

View full text Add to dashboard Cite

Lignin is an abundant renewable source of aromatics, but its complex heterogeneous structure poses challenges for its depolymerization and valorization. Heterogeneously catalyzed reductive depolymerization (HCRD) has emerged as a promising approach, utilizing heterogeneous catalysts to facilitate selective bond cleavage in lignin and hydrogen transfer to stabilize the products under mild conditions. This review provides a comprehensive understanding of the hydrogen transfer mechanisms in HCRD involving different hydrogen sources including molecular hydrogen, alcohols, formic acid, etc., and the native hydrogen donor groups in lignin. Recent advances in catalyst design for efficient lignin depolymerization are systematically discussed, focusing on precious metal‐based (Pt, Ru, Pd) and non‐precious metal‐based catalysts. Factors influencing catalyst performance, such as metal‐support interactions, promoters, and synergistic effects, are highlighted. The diverse array of high‐value aromatic chemicals obtained from HCRD is overviewed. Finally, the significance of HCRD in the context of lignin valorization and the development of integrated biorefineries is discussed, underscoring its potential to contribute to a sustainable bioeconomy.

show abstract

Efficient lignin conversion over Ni/(Fe/Zn/Co/Mo/Cu)–WO₃/Al₂O₃for selectively yielding alkyl phenols

Abstract: Alkyl phenols are mainly produced from non-renewable fossil-derived resources, of which the demand has been increasingly growing due to the rapid development of chemical industries. Due to the inherent aromaticity,...

Cited by 8 publications

References 77 publications

Sustainable Production of High-Value Chemicals from Selective Hydrogenolysis of Lignin Catalyzed by Co–Pd Bimetallic Supported on Nitrogen-Doped Carbon Spheres

Sustainable Production of High-Value Chemicals from Selective Hydrogenolysis of Lignin Catalyzed by Co–Pd Bimetallic Supported on Nitrogen-Doped Carbon Spheres

Lignin Catalytic Depolymerization for Guaiacols and Alkylphenols over Co–Zr/Sepiolite under Supercritical Ethanol

Heterogeneously Catalyzed Reductive Depolymerization of Lignin to Value‐Added Chemicals

Contact Info

Product

Resources

About