Reductive Gaseous (H2/NH3) Desulfurization and Gasification of High-Sulfur Petroleum Coke via Reactive Force Field Molecular Dynamics Simulations

Qifan Zhong, Yu Zhang, Sharmin Shabnam, Jin Xiao, Adri Van Duin, Jonathan P. Mathews

Research output: Contribution to journalArticle

Abstract

The use of high-sulfur petroleum coke (petcoke) as raw material in the carbon industry requires an effective desulfurization process. Hydrodesulfurization (HDS) and NH3 gaseous desulfurization are the most effective approaches. However, the S/N removal and the gasification ability of HDS and NH3 desulfurization have not been well-explored. Here, petcoke transitions were examined using the reactive force field simulation approach at a constant volume and temperature (3000 K for 250 ps). The S/N removal and transformations in HDS were thiophenic S → C1-4S, H1-2S → H2S, and pyrrolic and pyridinic N → C1-4N → HCN. Given the large H2 production from NH3 decomposition, the S/N removal and transformations in NH3 desulfurization were similar to those of HDS. However, NH compounds (NH3) directly bonded with C atoms in petcoke, adding to the coke yield but adding an additional heteroatom challenge with utilization after NH3 desulfurization. Produced C1-4N (CN, mostly) and H2 were transformed into HxC1-4N (0 < x < 5). The final stable gaseous compounds were HCN and H2S. For NH3 treatment, some NH compounds bonded with C atoms, resulting in an increased N content after NH3 desulfurization (higher coke yield compared to HDS).

Original languageEnglish (US)
Pages (from-to)8065-8075
Number of pages11
JournalEnergy and Fuels
Volume33
Issue number9
DOIs
StatePublished - Sep 19 2019

Fingerprint

Petroleum coke
Desulfurization
Hydrodesulfurization
Gasification
Sulfur
Molecular dynamics
Computer simulation
Coke
Atoms
Raw materials
Carbon
Decomposition
Industry

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

@article{038f8d21a78844d0acae7410e4c20c43,
title = "Reductive Gaseous (H2/NH3) Desulfurization and Gasification of High-Sulfur Petroleum Coke via Reactive Force Field Molecular Dynamics Simulations",
abstract = "The use of high-sulfur petroleum coke (petcoke) as raw material in the carbon industry requires an effective desulfurization process. Hydrodesulfurization (HDS) and NH3 gaseous desulfurization are the most effective approaches. However, the S/N removal and the gasification ability of HDS and NH3 desulfurization have not been well-explored. Here, petcoke transitions were examined using the reactive force field simulation approach at a constant volume and temperature (3000 K for 250 ps). The S/N removal and transformations in HDS were thiophenic S → C1-4S, H1-2S → H2S, and pyrrolic and pyridinic N → C1-4N → HCN. Given the large H2 production from NH3 decomposition, the S/N removal and transformations in NH3 desulfurization were similar to those of HDS. However, NH compounds (NH3) directly bonded with C atoms in petcoke, adding to the coke yield but adding an additional heteroatom challenge with utilization after NH3 desulfurization. Produced C1-4N (CN, mostly) and H2 were transformed into HxC1-4N (0 < x < 5). The final stable gaseous compounds were HCN and H2S. For NH3 treatment, some NH compounds bonded with C atoms, resulting in an increased N content after NH3 desulfurization (higher coke yield compared to HDS).",
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Reductive Gaseous (H2/NH3) Desulfurization and Gasification of High-Sulfur Petroleum Coke via Reactive Force Field Molecular Dynamics Simulations. / Zhong, Qifan; Zhang, Yu; Shabnam, Sharmin; Xiao, Jin; Van Duin, Adri; Mathews, Jonathan P.

In: Energy and Fuels, Vol. 33, No. 9, 19.09.2019, p. 8065-8075.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Reductive Gaseous (H2/NH3) Desulfurization and Gasification of High-Sulfur Petroleum Coke via Reactive Force Field Molecular Dynamics Simulations

AU - Zhong, Qifan

AU - Zhang, Yu

AU - Shabnam, Sharmin

AU - Xiao, Jin

AU - Van Duin, Adri

AU - Mathews, Jonathan P.

PY - 2019/9/19

Y1 - 2019/9/19

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AB - The use of high-sulfur petroleum coke (petcoke) as raw material in the carbon industry requires an effective desulfurization process. Hydrodesulfurization (HDS) and NH3 gaseous desulfurization are the most effective approaches. However, the S/N removal and the gasification ability of HDS and NH3 desulfurization have not been well-explored. Here, petcoke transitions were examined using the reactive force field simulation approach at a constant volume and temperature (3000 K for 250 ps). The S/N removal and transformations in HDS were thiophenic S → C1-4S, H1-2S → H2S, and pyrrolic and pyridinic N → C1-4N → HCN. Given the large H2 production from NH3 decomposition, the S/N removal and transformations in NH3 desulfurization were similar to those of HDS. However, NH compounds (NH3) directly bonded with C atoms in petcoke, adding to the coke yield but adding an additional heteroatom challenge with utilization after NH3 desulfurization. Produced C1-4N (CN, mostly) and H2 were transformed into HxC1-4N (0 < x < 5). The final stable gaseous compounds were HCN and H2S. For NH3 treatment, some NH compounds bonded with C atoms, resulting in an increased N content after NH3 desulfurization (higher coke yield compared to HDS).

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