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<p>Copper oxide catalysts (CuOx) supported on gamma alumina (γ-Al<sub>2</sub>O<sub>3</sub>) were employed for the catalytic reduction of sulfur dioxide (SO<sub>2</sub>) to elemental sulfur by methane (CH<sub>4</sub>). The catalysts were synthesized using a straightforward sol–gel method. Initially, alumina was obtained through a precipitation technique. X-ray diffraction (XRD) analysis was conducted to confirm the formation of γ-Al<sub>2</sub>O<sub>3</sub>. This study aimed to investigate the impact of reaction temperature (T = 600–800&#xa0;°C) and Cu loading (0–15&#xa0;wt%) on SO<sub>2</sub> conversion and sulfur selectivity. Under the reaction conditions of 800&#xa0;°C, 1&#xa0;bar, SO<sub>2</sub> = 5000&#xa0;ppm, CH<sub>4</sub> = 2500&#xa0;ppm, gas hourly space velocity (GHSV) = 12,000&#xa0;1/h, and 10&#xa0;wt% Cu, the SO<sub>2</sub> conversion and sulfur selectivity were determined to be 95% and 94.5%, respectively. The influence of the molar feed ratio of SO<sub>2</sub>/CH<sub>4</sub> = R = 0.5–3 on the 10&#xa0;wt% Cu catalyst was also investigated in the temperature range of 600–800&#xa0;°C. The findings revealed that when R &lt; 2, the conversion rate increased due to higher SO<sub>2</sub> reduction with an excess of CH<sub>4</sub>, but sulfur selectivity slightly decreased as a result of the formation of unwanted byproducts such as H<sub>2</sub>S and COS. Conversely, when R &gt; 2, SO<sub>2</sub> conversion significantly declined, while sulfur selectivity was enhanced due to increased consumption of CH<sub>4</sub>.</p>

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Catalytic reduction of SO2 to elemental sulfur with methane over CuOx/γ-Al2O3 catalysts

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月18日

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  • Mahnaz Pourkhalil,
  • Alimorad Rashidi,
  • Zohal Safaei Mahmoudabadi,
  • Majid Mirzaee,
  • Ensieh Ganji Babakhani,
  • Majid Esmaeili,
  • Soheila Sharafinia

摘要

Copper oxide catalysts (CuOx) supported on gamma alumina (γ-Al2O3) were employed for the catalytic reduction of sulfur dioxide (SO2) to elemental sulfur by methane (CH4). The catalysts were synthesized using a straightforward sol–gel method. Initially, alumina was obtained through a precipitation technique. X-ray diffraction (XRD) analysis was conducted to confirm the formation of γ-Al2O3. This study aimed to investigate the impact of reaction temperature (T = 600–800 °C) and Cu loading (0–15 wt%) on SO2 conversion and sulfur selectivity. Under the reaction conditions of 800 °C, 1 bar, SO2 = 5000 ppm, CH4 = 2500 ppm, gas hourly space velocity (GHSV) = 12,000 1/h, and 10 wt% Cu, the SO2 conversion and sulfur selectivity were determined to be 95% and 94.5%, respectively. The influence of the molar feed ratio of SO2/CH4 = R = 0.5–3 on the 10 wt% Cu catalyst was also investigated in the temperature range of 600–800 °C. The findings revealed that when R < 2, the conversion rate increased due to higher SO2 reduction with an excess of CH4, but sulfur selectivity slightly decreased as a result of the formation of unwanted byproducts such as H2S and COS. Conversely, when R > 2, SO2 conversion significantly declined, while sulfur selectivity was enhanced due to increased consumption of CH4.