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<p>Nickel tungstate (NiWO<sub>4</sub>) has emerged as a promising oxygen carrier (OC) for chemical looping due to its redox stability and resistance to sintering. In this work, we evaluate its performance in the conversion of pine bark biochar within a chemical looping gasification (CLG) scheme using Aspen Plus®. The process was modeled in three stages: biomass pyrolysis, NiWO<sub>4</sub> reduction with biochar, and steam reoxidation of the reduced phases. Thermodynamic equilibrium and sensitivity analysis identified the influence of temperature and steam feed on product distribution. Results show that NiWO<sub>4</sub> enhances biochar conversion and H<sub>2</sub> generation, but complete reoxidation at 750&#xa0;°C occurs only when WC formation is suppressed by high OC/C and steam-to-OC ratios (S/OC &gt; ≈22.2). An optimal window of 730–800&#xa0;°C and 100–130 kmol h⁻<sup>1</sup> of steam leads to CO–H<sub>2</sub> equilibrium, enabling syngas production and fully NiWO<sub>4</sub> reoxidation.</p> Graphical abstract <p></p>

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Nickel tungstate as an oxygen carrier for biochar conversion: An Aspen Plus® evaluation

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Lucero Pérez-Hernández,
  • Javier Eliel Morales-Mendoza,
  • Jorge Luis Domínguez-Arvizu,
  • Blanca Cristina Hernández-Majalca,
  • Alma Berenice Jasso Saucedo,
  • José Luis Bueno-Escobedo,
  • Iyiade Gbolahan Alalade,
  • Mario Alberto Pérez Méndez,
  • Alejandro López-Ortiz,
  • Virginia Hidolina Collins-Martínez

摘要

Nickel tungstate (NiWO4) has emerged as a promising oxygen carrier (OC) for chemical looping due to its redox stability and resistance to sintering. In this work, we evaluate its performance in the conversion of pine bark biochar within a chemical looping gasification (CLG) scheme using Aspen Plus®. The process was modeled in three stages: biomass pyrolysis, NiWO4 reduction with biochar, and steam reoxidation of the reduced phases. Thermodynamic equilibrium and sensitivity analysis identified the influence of temperature and steam feed on product distribution. Results show that NiWO4 enhances biochar conversion and H2 generation, but complete reoxidation at 750 °C occurs only when WC formation is suppressed by high OC/C and steam-to-OC ratios (S/OC > ≈22.2). An optimal window of 730–800 °C and 100–130 kmol h⁻1 of steam leads to CO–H2 equilibrium, enabling syngas production and fully NiWO4 reoxidation.

Graphical abstract