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 C.T. Van Duin, Jonathan P. Mathews

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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

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All Science Journal Classification (ASJC) codes

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

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