Regulation mechanism of three key parameters on catalytic characterization of molybdenum modified bimetallic micro-mesoporous catalysts during catalytic fast pyrolysis of enzymatic hydrolysis lignin

Xue, Shuang; Luo, Zhongyang; Zhou, Qingguo; Sun, Haoran; Du, Liwen

doi:10.1016/j.biortech.2021.125396

Cited by 28 publications

(7 citation statements)

References 40 publications

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“…Higher nickel loads promoted decarbonylation, decarboxylation and aromatization reactions, while higher copper loading increased the yields of olefins and phenols due to the dehydration and demethylation reactions [141]. Molybdenum combined with cobalt, iron or nickel supported on hierarchical HZSM-5 have also been investigated [142]. The NiMo/ZSM-5 catalyst exhibited less coke and converted more high-order graphite carbon to low-order carbon than the other catalysts.…”

Section: Zeolites-based Catalystsmentioning

confidence: 99%

Selecting Catalysts for Pyrolysis of Lignocellulosic Biomass

Rangel

Mayer

Carvalho

et al. 2023

Biomass

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The pyrolysis of lignocellulosic biomass is a promising technology for obtaining renewable chemicals and fuels to replace fossil-based products. However, due to the complexity of the lignin, cellulose and hemicellulose molecules, a large variety of compounds are often formed, making commercial implementation difficult. The use of a catalyst during reactions has been recognized as one of the major improvements in pyrolysis, allowing the production of selected compounds. Moreover, the large number of available catalysts opens up a wide range of possibilities for controlling the reaction network. Zeolites, hierarchical zeolites, alkali and alkaline earth oxides, transition metals and carbonaceous materials, among others, have been investigated in the pyrolysis of a variety of biomasses. In addition, bifunctional catalysts play a role in pyrolysis, as well as the addition of plastics as hydrogen donors. This review aims to present and discuss in detail state-of-the-art catalytic pyrolysis, focusing on the relationships between the properties of the catalysts and the obtained products. A guideline for selecting catalysts for lignocellulosic biomass is also provided.

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Section: Zeolites-based Catalystsmentioning

confidence: 99%

Selecting Catalysts for Pyrolysis of Lignocellulosic Biomass

Rangel

Mayer

Carvalho

et al. 2023

Biomass

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“…It was reported that the cracking reaction of macromolecular reactants occurs in the mesoporous layer, and the formed small cracking products molecule reached the microporous core for the succeeding reactions, resulting in an improved product yield [71] . Inspired by this idea, the hierarchical zeolites have been applied in the catalytic pyrolysis of lignin and/or lignocellulose to facilitate the diffusion of reactants and alleviate the carbon deposition on catalyst [71,72] . For example, Xue et al.…”

Section: Current Techniques For Reducing the Diffusion Limitationsmentioning

confidence: 99%

“…For example, Xue et al. reported bimetallic micro‐mesoporous catalyst (NiMo/AZM) for enzymatic hydrolysis lignin pyrolysis [72] . A significantly higher mass yield of monocyclic aromatic hydrocarbons (MAHs) and the minimum selectivity of bulky oxygenates afforded 13.15 wt % and 3.82 %, respectively, over NiMo/AZM catalyst in comparison with that over micropore catalysts.…”

Section: Current Techniques For Reducing the Diffusion Limitationsmentioning

confidence: 99%

“…[71] Inspired by this idea, the hierarchical zeolites have been applied in the catalytic pyrolysis of lignin and/or lignocellulose to facilitate the diffusion of reactants and alleviate the carbon deposition on catalyst. [71,72] For example, Xue et al reported bimetallic micro-mesoporous catalyst (NiMo/AZM) for enzymatic hydrolysis lignin pyrolysis. [72] A significantly higher mass yield of monocyclic aromatic hydrocarbons (MAHs) and the minimum selectivity of bulky oxygenates afforded 13.15 wt % and 3.82 %, respectively, over NiMo/AZM catalyst in comparison with that over micropore catalysts.…”

Section: Hierarchical Materials For Pyrolysismentioning

confidence: 99%

“…[71,72] For example, Xue et al reported bimetallic micro-mesoporous catalyst (NiMo/AZM) for enzymatic hydrolysis lignin pyrolysis. [72] A significantly higher mass yield of monocyclic aromatic hydrocarbons (MAHs) and the minimum selectivity of bulky oxygenates afforded 13.15 wt % and 3.82 %, respectively, over NiMo/AZM catalyst in comparison with that over micropore catalysts. They further introduced a diffusion factor (DF, DF = (V meso-i /V meso-z )/(S meso-i /S meso-z )), where V meso-i /V meso-z and S meso-i /S meso-z represent mesopore volume and mesoporous surface area of a certain catalyst/parent HZSM-5, as the structural parameter to quantitate the impact of micro-mesoporous structure on product distribution from pyrolysis.…”

Section: Hierarchical Materials For Pyrolysismentioning

confidence: 99%

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Critical Techniques for Overcoming the Diffusion Limitations in Heterogeneously Catalytic Depolymerization of Lignin

Cui

Wang

et al. 2023

ChemSusChem

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Heterogeneously catalyzed depolymerization of lignin to valueadded chemicals is increasingly attractive but highly challengeable. Particularly, the diffusion limitation of lignin macromolecule to the solid catalyst surface is a big barrier, which significantly decreases the yield of monomer while increasing char formation. Therefore, for the potential industrial utilization of lignin, new knowledge focused on the size of lignin particles is of great importance to offer guidance for promoting lignin depolymerization and suppressing condensation in the hetero-geneously catalytic systems. In this Review, the size of lignin particles and macromolecules are summarized. Previous approaches for improving the mass diffusion including enhancing the solubility of lignin and exploitation of hierarchical and "solubilized" materials are also discussed. Based on these, a constructive perspective is proposed. Thus, this work provides a new insight on the rational design of heterogeneous catalytic techniques for efficient utilization of the aromatic polymer of lignin.

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