| 罗冰冰,黄嘉玮,汪朱峰,苏亚欣.Ho改性OMS-2催化CO选择性还原NO的研究[J].分子催化,2023,37(3):264-273 |
| Ho改性OMS-2催化CO选择性还原NO的研究 |
| Study on Ho-modified OMS-2 Catalysts for Selective Catalytic Reduction of NO by CO |
| 投稿时间：2022-11-29 修订日期：2023-01-30 |
| DOI：10.16084/j.issn1001-3555.2023.03.006 |
| 中文关键词: OMS-2 Ho改性 CO-SCR 抗SO2 |
| 英文关键词:OMS-2 Ho doping CO-SCR SO2 resistance |
| 基金项目:国家自然科学基金项目(52276103) |
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| 摘要点击次数: 345 |
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| 中文摘要: |
| 采用水热法一步合成了Ho改性的氧化锰八面体分子筛催化剂(Hox-OMS-2), 并对其CO选择性催化还原NO(CO-SCR)性能进行了研究. 研究结果表明, 当Ho/Mn摩尔比为0.05时, Ho0.05-OMS-2催化剂在225 ℃时可实现98.3%的NO转化率和N2选择性. Ho的掺杂过量时会导致催化剂团聚. 此外, 在0.02%SO2存在时, Ho0.05-OMS-2催化剂在200~250 ℃时仍能保持80%以上的NO转化率, 并具有较好的抗硫性能. 通过XRD、 BET、 XPS、 H2-TPR和NH3-TPD对催化剂进行表征, 探究Ho物种的掺杂对OMS-2催化剂的物理化学性质的影响. 结果表明, Hox-OMS-2催化剂低温活性的增强可归因于晶格膨胀、 较低的结晶度、 高比表面积、 较高的Mn4+含量、 更多的表面氧空位和Brønsted酸性位的生成等. |
| 英文摘要: |
| One-step hydrothermal synthesis method was used to prepare the Ho-doped Manganese oxide octahedral molecular sieves catalyst (Hox-OMS-2) and the reactivity for selective catalytic reduction of NO with CO (CO-SCR) was examined. The outcomes demonstrated that the Ho0.05-OMS-2 catalyst displayed very attractive CO-SCR activity at 225 ℃ when the Ho/Mn molar ratio was 0.05, e.g., 98.3% NO conversion and N2 selectivity. Furthermore, even in the presence of 0.02% SO2, the Ho0.05-OMS-2 catalyst can retain more than 80% NO conversion at 200~250 ℃, and the catalyst has good sulfur resistance. SEM, XRD, BET, XPS, H2-TPR, NH3-TPD, and other techniques were used to characterize the catalysts and analyze how the presence of Ho species in Hox-OMS-2 affected their physicochemical properties and reactivity. The outcomes show that the lattice expansion, decreased crystallinity, high specific surface area, increased Mn4+ concentration, enhanced surface oxygen vacancies, and Brønsted acidic bit can all contribute to the improved low-temperature activity of Hox-OMS-2 catalysts. |
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