Encapsulation Ni in HZSM-5 for catalytic hydropyrolysis of biomass to light aromatics

Ren, Xue-Yu; Cao, Jing‐Pei; Zhao, Shi-Xuan; Zhao, Xiao-Yan; Liu, Tianlong; Feng, Xiaobo; Yang, Li; Zhang, Ji; Bai, Hongcun

doi:10.1016/j.fuproc.2021.106854

Cited by 25 publications

(10 citation statements)

References 68 publications

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“…XRD was used to characterize the crystalline phases for the selected 1%Ni3%Mo-HZSM-5 catalyst prepared after calcination and that prepared after reduction, as shown in Figure S2. The untreated HZSM-5 sample showed a set of diffraction peaks corresponding to the d -spacings of the mordenite framework inverted (MFI) . For both the catalyst prepared after calcination and that prepared after reduction, the crystalline framework of zeolite remained intact, and no more crystalline phases were assigned by excluding all of the diffraction peaks belonging to the HZSM-5 support.…”

Section: Resultsmentioning

confidence: 99%

“…The untreated HZSM-5 sample showed a set of diffraction peaks corresponding to the d-spacings of the mordenite framework inverted (MFI). 48 For both the catalyst prepared after calcination and that prepared after reduction, the crystalline framework of zeolite remained intact, and no more crystalline phases were assigned by excluding all of the diffraction peaks belonging to the HZSM-5 support. The result confirmed that both Ni and Mo occurred as an amorphous phase even after the catalyst was subjected to the reduction process.…”

Section: Methodsmentioning

confidence: 99%

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Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

et al. 2021

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Noncatalytic hydropyrolysis of pine sawdust integrated with downstream catalytic vapor hydrotreating was conducted in a two-stage fixed bed reactor under 5 MPa H 2 . Among the catalysts used in the experiments (HZSM-5, 1%Mo-HZSM-5, 1%Ni-HZSM-5, and three NiMo-HZSM-5 catalysts of different metal loadings), bimetallic 1%Ni3%Mo-HZSM-5 acted as the best catalyst. The hydrotreatment with this catalyst at 320 °C converted the oxygenated bio-oil entirely into liquid hydrocarbons with a yield as high as 23.9% of dried biomass. Aliphatic hydrocarbons, mostly the gasoline naphthenic components, accounted for approximately 71.7% of the hydrotreated bio-oil, and the rest was mainly monoaromatic hydrocarbons and partially hydrogenated aromatics without oxygenates being detected. This catalyst also showed a much lower yield of coke than 1%Mo-HZSM-5. The hydrotreatment above 350 °C tended to favor the generation of alkane gases, accompanied by a dramatic decline in the bio-oil yield. Preliminary mechanistic studies suggested that Mo played a major role in promoting the formation of intermediates on the surface of the catalyst, while Ni facilitated the hydrogenation of the intermediates to liquid hydrocarbons or gaseous alkanes. There was a clear synergistic effect between Ni and Mo. Among the six catalysts, 1%Ni3%Mo-HZSM-5 had the most plentiful sites of weak and medium acids and the strongest hydrogenating effect on bio-oil. The synergistic effect was important for enhancing the production of liquid hydrocarbon fuels.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

et al. 2021

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“…27b). 212 In conclusion, the unique metal encapsulation structure of metal@zeolite provides a different perspective for upgrading biomass to more valuable chemicals and fuels in cascade reactions for sustainable development.…”

Section: Confinement Effect In Biomass Upgradingmentioning

confidence: 98%

Zeolite confinement-catalyzed cleavage of C–O/C–C bonds in biomass

2022

Green Chem.

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“…In this case, amine- and mercapto-based molecules can efficiently stabilize metal cations. Amine-based stabilizing agents that are used to stabilize metal cations includes ammonia (NH 3 ), ethylenediamine (EDA), − tetraethylenepentamine (TEPA), triethylenetetramine (TETA), and N , N -dimethylformamide (DMF) . Besides the stabilization properties, these amine-based ligands could also act as tethers favoring the interactions between metal complex and incipient aluminosilicate nuclei during their self-assembly into zeolite frameworks.…”

Section: Synthetic Strategiesmentioning

confidence: 99%

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

2022

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Zeolites with ordered microporous systems, distinct framework topologies, good spatial nanoconfinement effects, and superior (hydro)thermal stability are an ideal scaffold for planting diverse active metal species, including single sites, clusters, and nanoparticles in the framework and framework-associated sites and extra-framework positions, thus affording the metal-in-zeolite catalysts outstanding activity, unique shape selectivity, and enhanced stability and recyclability in the processes of Brønsted acid-, Lewis acid-, and extra-framework metal-catalyzed reactions. Especially, thanks to the advances in zeolite synthesis and characterization techniques in recent years, zeolite-confined extraframework metal catalysts (denoted as metal@zeolite composites) have experienced rapid development in heterogeneous catalysis, owing to the combination of the merits of both active metal sites and zeolite intrinsic properties. In this review, we will present the recent developments of synthesis strategies for incorporating and tailoring of active metal sites in zeolites and advanced characterization techniques for identification of the location, distribution, and coordination environment of metal species in zeolites. Furthermore, the catalytic applications of metal-in-zeolite catalysts are demonstrated, with an emphasis on the metal@zeolite composites in hydrogenation, dehydrogenation, and oxidation reactions. Finally, we point out the current challenges and future perspectives on precise synthesis, atomic level identification, and practical application of the metal-in-zeolite catalyst system.

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Encapsulation Ni in HZSM-5 for catalytic hydropyrolysis of biomass to light aromatics

Cited by 25 publications

References 68 publications

Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

Catalytic Hydrotreatment of Pine Sawdust Hydropyrolysis Vapor over Ni, Mo-Impregnated HZSM-5 for Optimal Production of Gasoline Components

Zeolite confinement-catalyzed cleavage of C–O/C–C bonds in biomass

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

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