Integrated coal pyrolysis with methane aromatization over Mo/HZSM-5 for improving tar yield

Jin, Lijun; Zhou, Xun; He, Xinfu; Hu, Haoquan

doi:10.1016/j.fuel.2012.01.024

Cited by 55 publications

(15 citation statements)

References 17 publications

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“…In comparison with the TEAOH-treated sample, larger mesopores are observed in the bulky body of the TPAOH-treated sample. As confirmed in a previous work, the processes of both dissolution and recrystallization can be promoted when the treatment time is increased in the hydrothermal method using TEAOH and TPAOH solutions. As shown in Figure , it should be noted that an ultrathin protective shell of silicalite-1 is formed on the surface of the crystal when the hydrothermal treatment time is increased to 72 h, which is attributed to the recrystallization of the dissolved silica species on the surface of the crystal.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Enhancement of Aromatic Products and Catalytic Lifetime for Catalytic Re-forming of Lignite Pyrolysis Volatiles over a Self-Assembled Hierarchical Core–Shell ZSM-5@Silicalite-1 Zeolite

Feng

Cao

Yao

et al. 2021

ACS Sustainable Chem. Eng.

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Catalytic re-forming of lignite pyrolysis volatiles to aromatics over zeolites is a promising method for value-added utilization of coal tar. However, to achieve a significant enhancement in both the yields of light aromatics and the catalytic lifetime by adjusting the structure of ZSM-5 zeolite and to understand its catalytic mechanism comprehensively are still great challenges. Herein, a self-assembled hierarchical core−shell ZSM-5@silicalite-1 with controlled mesopores and acidity as well as an ultrathin nonacidic protective shell was synthesized through a mild hydrothermal method of alkaline treatment with tetrapropylammonium hydroxide or tetraethylammonium hydroxide (TPAOH or TEAOH). Both the number and pore size distribution of mesopores can be regulated by adjusting the hydrothermal treatment time. These generated mesopores not only facilitate the mass transfer of reactants and products but also improve the utilization efficiency of the acid site. In addition, the newly fabricated nonacidic shell, which coats on the surface of ZSM-5 as a chain mail, plays a critical role in suppressing the coke formation by passivation of the acid sites on the external surface. In this work, the pore properties and acid distribution of ZSM-5 zeolite can be regulated synchronously through a desilication−recrystallization process. In addition, enhanced yields of light aromatics and catalytic lifetime were obtained simultaneously. The construction of this hierarchical core−shell zeolite with redistributed acid sites contributes to the highly efficient catalytic upgrading of macromolecular reactants.

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Section: Resultsmentioning

confidence: 99%

Simultaneous Enhancement of Aromatic Products and Catalytic Lifetime for Catalytic Re-forming of Lignite Pyrolysis Volatiles over a Self-Assembled Hierarchical Core–Shell ZSM-5@Silicalite-1 Zeolite

Feng

Cao

Yao

et al. 2021

ACS Sustainable Chem. Eng.

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“…The other is to direct all MDA output to MRC. This latter is backed by recent report suggesting a synergistic effect between coal pyrolysis and methane aromatization [15]. Certainly, the aromatics produced by MDA may improve diffusion of the gas reactants to the carbonaceous surface enhancing liquefaction.…”

Section: Mda Stagementioning

confidence: 73%

Basic Engineering of a Two-Stage Process for Co-Upgrading Natural Gas and Petroleum Coke

Laine¹,

Tosta²

2015

ACES

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This communication highlights the possibility of using a novel two-stage process for the co-upgrading of natural gas and petroleum coke into liquid hydrocarbons. The first stage consists of the catalytic dehydroaromatization of methane characterized by producing hydrogen and aromatics: benzene, naphtalene, toluene, etc. The non-reacted methane plus hydrogen and aromatics produced in the first stage are directed to the second stage to react with the petroleum coke. Basic engineering analysis of proposed two-stage process suggests light petroleum production of 160,000 bbl/day from 20,000 ton/day of petroleum coke actually by-produced from Venezuelan Orinoco's heavy oil belt. Residual coke should be volatiles free therefore useful as a calcined coke.

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“…By co-feeding methane with CO 2 , acetic acid and formic acid mixtures onto a Mo/HZSM-5 catalyst, Bedard et al [31] and concluded that methane dehydroaromatization was highly dependent on thermodynamic equilibrium, while the addition of oxygenates had no effect on the net rate of benzene synthesis. Jin et al [32] conducted coal pyrolysis over Mo/HZSM-5 catalyst under methane and hydrogen atmosphere, and found that the total liquid yield under methane atmosphere was significantly higher than that under hydrogen atmosphere. Liu and Wang et al [33,34] found that by integrating coal pyrolysis with CO 2 reforming of methane, the liquid yield increased by 0.6 and 0.8 times as compared to the liquid yield obtained by coal pyrolysis under nitrogen and hydrogen, respectively.…”

Section: Introductionmentioning

confidence: 99%

Integration of biomass catalytic pyrolysis and methane aromatization over Mo/HZSM-5 catalysts

Yang

Kumar

Apblett

2016

Journal of Analytical and Applied Pyrolysis

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The development of an effective process to convert bio-oil into intermediate platforms that are compatible with the existing refinery infrastructure is highly needed. To overcome the high cost of hydrogen consumption in conventional bio-oil upgrading processes, this paper reports a novel process that converts three major biomass constituents (cellulose, hemicellulose and lignin) directly into liquid fuels via pyrolysis in the presence of methane over molybdenum impregnated HZSM-5 catalysts. The carbon yield of total aromatics from lignin increased from 12.80 to 15.13 % when pyrolysis atmosphere switched from helium to methane in the presence of HZSM-5 support. However, methane was not effective in improving the aromatics yield from cellulose and hemicellulose in the presence of Mo-modified HZSM-5 catalysts. The molybdenum impregnated catalyst was found to promote deoxygenation of lignin-derived phenols. The carbon yield of polyaromatics from lignin was 5.47 % in the presence of HZSM-5 support under methane, compared to 2.61 % that obtained in the presence of Mo 2 C/HZSM-5.

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Integrated coal pyrolysis with methane aromatization over Mo/HZSM-5 for improving tar yield

Cited by 55 publications

References 17 publications

Simultaneous Enhancement of Aromatic Products and Catalytic Lifetime for Catalytic Re-forming of Lignite Pyrolysis Volatiles over a Self-Assembled Hierarchical Core–Shell ZSM-5@Silicalite-1 Zeolite

Simultaneous Enhancement of Aromatic Products and Catalytic Lifetime for Catalytic Re-forming of Lignite Pyrolysis Volatiles over a Self-Assembled Hierarchical Core–Shell ZSM-5@Silicalite-1 Zeolite

Basic Engineering of a Two-Stage Process for Co-Upgrading Natural Gas and Petroleum Coke

Integration of biomass catalytic pyrolysis and methane aromatization over Mo/HZSM-5 catalysts

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