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<p>The growing need for clean and sustainable energy has an increased interest in dimethyl ether (DME) as a promising alternative fuel, due to its high cetane number, soot-free combustion, and low emissions. This study investigates Fe<sub>1−x</sub>M<sub>x</sub>WO<sub>4</sub> (M = Cu<sup>2+</sup>&#xa0;or Ni<sup>2+</sup>) nanocomposites as solid acid catalysts for methanol dehydration to DME, a clean fuel with high cetane number and low emissions. Catalysts (x = 0.1–0.9) were synthesized via co-precipitation and characterized using XRD, FTIR, XPS, pyridine-TPD, and nitrogen sorption. Catalytic performance was evaluated in a fixed-bed reactor, assessing substitution ratios, calcination temperatures, and promoter effects. Fe<sub>0.3</sub>Cu<sub>0.7</sub>WO<sub>4</sub> with 15 wt% Zr<sup>4+</sup> achieved 89% methanol conversion at 350&#xa0;°C, while Fe<sub>0.7</sub>Ni<sub>0.3</sub>WO<sub>4</sub> with 10 wt% SO<sub>4</sub><sup>2−</sup> reached 91% conversion at 300&#xa0;°C, both with high DME selectivity. Enhanced acidity and surface area from doping make these catalysts promising for sustainable DME production. Moreover, the most active catalysts showed excellent reusability over four regeneration cycles without significant loss of activity or selectivity. Moreover, the use of SO<sub>4</sub><sup>2−</sup>&#xa0;and Zr<sup>4+</sup>&#xa0;as dopants offers a scalable and relatively environmentally friendly approach that supports potential industrial applications.</p>

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Enhancing FeWO4 Catalytic Performance for Methanol Dehydration to Dimethyl Ether: The Role of Cu²⁺ and Ni²⁺ Substitution

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Abd El-Aziz A. Said,
  • Mohamed N. Goda,
  • Esraa Magdy,
  • Mohamed Abd El-Aal

摘要

The growing need for clean and sustainable energy has an increased interest in dimethyl ether (DME) as a promising alternative fuel, due to its high cetane number, soot-free combustion, and low emissions. This study investigates Fe1−xMxWO4 (M = Cu2+ or Ni2+) nanocomposites as solid acid catalysts for methanol dehydration to DME, a clean fuel with high cetane number and low emissions. Catalysts (x = 0.1–0.9) were synthesized via co-precipitation and characterized using XRD, FTIR, XPS, pyridine-TPD, and nitrogen sorption. Catalytic performance was evaluated in a fixed-bed reactor, assessing substitution ratios, calcination temperatures, and promoter effects. Fe0.3Cu0.7WO4 with 15 wt% Zr4+ achieved 89% methanol conversion at 350 °C, while Fe0.7Ni0.3WO4 with 10 wt% SO42− reached 91% conversion at 300 °C, both with high DME selectivity. Enhanced acidity and surface area from doping make these catalysts promising for sustainable DME production. Moreover, the most active catalysts showed excellent reusability over four regeneration cycles without significant loss of activity or selectivity. Moreover, the use of SO42− and Zr4+ as dopants offers a scalable and relatively environmentally friendly approach that supports potential industrial applications.