碱土金属掺杂OMS-2对CO催化氧化研究

　　

本研究通过碱土金属掺杂来提高OMS-2催化氧化CO的活性及其抗硫抗水性能。制备的催化剂呈典型的纳米棒状结构，碱土金属成功引入OMS-2隧道中，且均匀分布，掺杂碱土金属后OMS-2的结构和晶型并未被破坏，其比表面积也得到提高。CO氧化实验结果表明，掺杂碱土金属离子后催化剂氧化CO的效率及抗硫活性明显提高，OMS-2-Ca具有最佳的CO氧化性能及抗硫能力。O₂在CO氧化反应中起到了重要作用，且Ca²⁺的引入有效地提高了OMS-2的耐水性。通过XPS分析表明Mn⁴⁺和表面吸附氧可能是作为活性组分参与CO氧化反应。

Abstract: Alkaline earth metal doping was used to improve the CO catalytic oxidation activity and the resistance of sulfur and water of OMS-2. The prepared catalyst showed a typical nanorod-like structure, and the alkali earth metal was successfully introduced into the OMS-2 tunnel with uniform distribution. After doping the alkali earth metal, the structure and crystal of OMS-2 were not damaged, and its specific surface area was also improved. The experimental results of CO oxidation showed that the CO oxidation efficiency and sulfur resistance of the catalyst were significantly improved after doping alkaline earth metal ions, and OMS-2-Ca had the highest CO oxidation performance and sulfur resistance. O₂ plays an important role in the oxidation of CO, and the introduction of Ca²⁺ effectively improves the water resistance of OMS-2. XPS analysis showed that Mn⁴⁺ and surface adsorbed oxygen may participate in CO oxidation process as active components.

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