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<p>The catalyst for ammonia synthesis from dinitrogen and dihydrogen based on mononuclear potassium carbonyl ruthenate K<sub>2</sub>[Ru(CO)<sub>4</sub>] (precursor of catalytically active species) deposited on graphite-like carbon Sibunit exhibits an interesting feature when promoted with metallic potassium and Bu<sup>n</sup>Li. Namely, the activity of the catalyst based on K<sub>2</sub>[Ru(CO)<sub>4</sub>]/Sibunit noticeably increases after thermal removal of CO ligands followed by short-term exposure to air compared to the activity of the standard K<sub>2</sub>[Ru(CO)<sub>4</sub>]/Sibunit sample not exposed to air. Unlike the latter, the air-exposed catalyst simultaneously promoted with both metallic potassium and Bu<sup>n</sup>Li becomes much more efficient than the air-exposed catalyst promoted with metallic potassium only.</p>

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Supported mononuclear carbonyl ruthenate as a catalyst for gas-phase ammonia synthesis. Effect of short-term exposure of the catalyst to air

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • S. M. Yunusov,
  • E. S. Kalyuzhnaya,
  • V. V. Morozov

摘要

The catalyst for ammonia synthesis from dinitrogen and dihydrogen based on mononuclear potassium carbonyl ruthenate K2[Ru(CO)4] (precursor of catalytically active species) deposited on graphite-like carbon Sibunit exhibits an interesting feature when promoted with metallic potassium and BunLi. Namely, the activity of the catalyst based on K2[Ru(CO)4]/Sibunit noticeably increases after thermal removal of CO ligands followed by short-term exposure to air compared to the activity of the standard K2[Ru(CO)4]/Sibunit sample not exposed to air. Unlike the latter, the air-exposed catalyst simultaneously promoted with both metallic potassium and BunLi becomes much more efficient than the air-exposed catalyst promoted with metallic potassium only.