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<p>Catalytic hydrolysis was regarded as the most feasible technology of removing carbonyl sulfide (COS) from blast furnace gas (BFG) or coke oven gas (COG). However, the current hydrolysis catalysts were deactivated due to sulfur species deposition. In this paper, N doping Al<sub>2</sub>O<sub>3</sub> catalysts were successfully synthesized by one-pot method, which could achieve 98% COS conversion efficiency and 90% H<sub>2</sub>S selectivity under 70&#xa0;°C after 24&#xa0;h reaction. The characterization revealed that nitrogen doping could increase the specific surface area, pore size and pore volume of Al<sub>2</sub>O<sub>3</sub> catalysts. Especially, the average pore diameter of N doping Al<sub>2</sub>O<sub>3</sub> catalysts was broaden from 2 to 13&#xa0;nm to 2–17&#xa0;nm. Moreover, N doping was beneficial to pyridine nitrogen formation, which promoted Lewis basic sites and the number of hydroxyl groups. Thus, the active oxygen in the catalysts were consumed and sulfur species deposition was suppressed. COS conversion efficiency and lifetime of N doping Al<sub>2</sub>O<sub>3</sub> catalysts were increased. This study provides a new COS hydrolysis catalyst with higher activity and stability, offering promising potential for the commercial application.</p>

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One-Pot Synthesis of N Doping Al2O3 Catalyst for Efficient Hydrolysis of COS

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Jun Han,
  • Xinyu Yang,
  • Linbo Qin,
  • Mufang Hu,
  • Bo Zhao

摘要

Catalytic hydrolysis was regarded as the most feasible technology of removing carbonyl sulfide (COS) from blast furnace gas (BFG) or coke oven gas (COG). However, the current hydrolysis catalysts were deactivated due to sulfur species deposition. In this paper, N doping Al2O3 catalysts were successfully synthesized by one-pot method, which could achieve 98% COS conversion efficiency and 90% H2S selectivity under 70 °C after 24 h reaction. The characterization revealed that nitrogen doping could increase the specific surface area, pore size and pore volume of Al2O3 catalysts. Especially, the average pore diameter of N doping Al2O3 catalysts was broaden from 2 to 13 nm to 2–17 nm. Moreover, N doping was beneficial to pyridine nitrogen formation, which promoted Lewis basic sites and the number of hydroxyl groups. Thus, the active oxygen in the catalysts were consumed and sulfur species deposition was suppressed. COS conversion efficiency and lifetime of N doping Al2O3 catalysts were increased. This study provides a new COS hydrolysis catalyst with higher activity and stability, offering promising potential for the commercial application.