In situ upgrading of Shengli lignite pyrolysis vapors over metal-loaded HZSM-5 catalyst

Liu, Tian-Long; Cao, Jing‐Pei; Zhao, Xiao-Yan; Wang, Jing-Xian; Ren, Xue-Yu; Fan, Xing; Zhao, Yunpeng; Wei, Xian‐Yong

doi:10.1016/j.fuproc.2017.02.012

Cited by 165 publications

(61 citation statements)

References 54 publications

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“…Lignite has a high ability of spontaneous combustion since the rich in oxygen-containing species (OCSs) [1][2][3]. Due to abundance in OCSs, lignite was reported present high ion-exchanging ability with metal, such as Ni, and great dispersion of the Ni within the coal matrix [4,5].…”

Section: Introductionmentioning

confidence: 99%

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

Ren

Cao

Zhao

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

Ren

Cao

Zhao

et al. 2017

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“…As an important component of coalbed methane resources, biogenic coalbed methane has attracted increasing attention in recent years worldwide . As a type of macromolecular carbonaceous polymer with three‐dimensional structure, coal is mainly formed by intermolecular covalent bond and association interaction . The macromolecular structure model of coal shows that the coal macromolecules are polymerized from many basic structural units with similar and different structures and mainly consist of condensed aromatic rings, together with a small number of hydrogenated aromatic rings, alicyclic rings, and heterocycles.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] As a type of macromolecular carbonaceous polymer with three-dimensional structure, coal is mainly formed by intermolecular covalent bond and association interaction. 5,6 The macromolecular structure model of coal shows that the coal macromolecules are polymerized from many basic structural units with similar and different structures and mainly consist of condensed aromatic rings, together with a small number of hydrogenated aromatic rings, alicyclic rings, and heterocycles. Its periphery is connected to alkyl side chain with less than three carbons and various functional groups.…”

Section: Introductionmentioning

confidence: 99%

Controlling mechanism of coal chemical structure on biological gas production characteristics

et al. 2020

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Summary To find the effect of coal chemical structure on biogas production, Lignite B was collected and extracted with nitrogen methylpyrrolidone (NMP), acetone and 0.60 mol/L NaOH. Simultaneously, methanogenic bacteria were enriched, and gas production experiments involving solvent extraction from residual coal and secondary gas production experiments involving coal were performed. The characteristics of biogas production, microcrystalline structure and coal chemical structure were analyzed. The results showed that the biogas production capacity of residual coal extracted by different solvents differed. The biogas production capacity of residual coal extracted by 0.60 mol/L NaOH was severely inhibited. The biogas production capacity of residual coal extracted by NMP and acetone was enhanced compared with that of raw coal. In contrast, primary residual coal still exhibits potential for methane production, but the methane production efficiency was reduced. Changes in the microcrystalline structure and functional groups of residual coal showed that solvent extraction increases the spacing and stacking height of the aromatic lamellae of coal, reduces the hydroxyl, methyl, methylene and aromatic hydrocarbon levels in coal, loosens the macromolecular network structure of coal, and enhances the connectivity of pores and fissures, thus allowing methane‐producing bacteria to enter the coal mass and create favorable conditions for gas production through interactions between the two. X‐ray photoelectron spectroscopy measurements showed that the secondary gas production increased the C content on the coal surface, decreased the O content and the O/C ratio, thus promoting the consumption of oxygen‐containing functional groups on the coal surface to further produce gas.

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“…Catalytic cracking is a promising way for obtaining high‐quality tar, and catalyst can cause secondary cracking of coal pyrolysis tar, making heavy components cracked into light oil and gas . Liu et al . investigated the effect of Co−, Mo− and Ni/HZSM‐5 on catalytic upgrading of Shengli lignite tar and found that the use of bifunctional metal‐loaded HZSM‐5 could obtain upgraded tar with high aromatics content.…”

Section: Introductionmentioning

confidence: 99%

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al₂O₃ Catalysts

Cao

Wang

et al. 2020

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In-situ upgrading of coal pyrolysis tar with steam catalytic cracking (SCC) is a promising technique to improve tar quality. In this study, Ni/Al 2 O 3 catalysts with different Ni contents were used for in-situ SCC of coal pyrolysis tar at 650°C. The results showed that Ni/Al 2 O 3 catalysts can enhance the water conversion and light tar yield. Both SCC and tar catalytic cracking can occur simultaneously over Ni/Al 2 O 3 , and the free radicals produced by tar catalytic cracking can be stabilized by active species generated from SCC to avoid excessive cracking of tar and improve light tar yield. 4Ni/Al 2 O 3 (4 wt. % Ni) exhibits the best performance, contributing to the highest water conversion of 4.74 wt. % and light tar yield of 11.90 wt. %, respectively.Correspondingly, the content of light fraction (boiling point less than 360°C) in tar sample increases from 48.0 wt. % to 67.0 wt. %, and the average molecular weight decreases from 353 amu to 253 amu over 4Ni/Al 2 O 3 . This is consistent with the increase of benzenes, phenols and naphthalenes and the decrease of long-chain aliphatic hydrocarbons, 3-and 4-ring aromatics in upgraded tar. In addition, the higher ratio of uncondensed aromatic protons to condensed aromatic protons in upgraded tar reveals the fact that 4Ni/Al 2 O 3 can promote ring-opening reaction of PAHs, which can well interpret the tar upgrading process.

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In situ upgrading of Shengli lignite pyrolysis vapors over metal-loaded HZSM-5 catalyst

Cited by 165 publications

References 54 publications

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

Controlling mechanism of coal chemical structure on biological gas production characteristics

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al₂O₃ Catalysts

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In situ upgrading of Shengli lignite pyrolysis vapors over metal-loaded HZSM-5 catalyst

Cited by 165 publications

References 54 publications

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

Controlling mechanism of coal chemical structure on biological gas production characteristics

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al2O3 Catalysts

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In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al₂O₃ Catalysts