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Catalytic Toluene Combustion over Metastable Layered Manganese Cobalt Oxide Nanosheet Catalysts
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-11-15 , DOI: 10.1021/acs.iecr.1c03339 Keisuke Awaya 1 , Yuto Koyanagi 2 , Kazuto Hatakeyama 1 , Junya Ohyama 1, 3 , Limin Guo 4 , Toshiyuki Masui 5 , Shintaro Ida 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-11-15 , DOI: 10.1021/acs.iecr.1c03339 Keisuke Awaya 1 , Yuto Koyanagi 2 , Kazuto Hatakeyama 1 , Junya Ohyama 1, 3 , Limin Guo 4 , Toshiyuki Masui 5 , Shintaro Ida 1
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A noble metal-free catalyst with metastable layered structures for combustion of toluene was prepared using an electrostatic self-assembly method. In this process, transition metal ions were sandwiched between negatively charged manganese cobalt oxide nanosheets with a thickness of 0.8 nm (Mn+/MnCoO, Mn+: Mn2+, Fe3+, Co2+, and Cu2+). The lowest temperature for decomposition of toluene (T50 = 217 °C) was observed for Cu2+/MnCoO, which showed almost the same activity as a 0.27 wt % Pt-loaded CeO2–ZrO2 catalyst. XPS and H2-TPR spectra suggested that interlayer Cu2+ ions contributed to reducing the Mn(IV)/Mn(III) ratio and enhancing the reducibility of MnCoO nanosheets, which played an important role in improving the catalytic activity of toluene oxidation through the Mars van Krevelen mechanism. The results indicated that metastable layered structures obtained from 2D materials could open a new route for the preparation of improved noble metal-free combustion catalysts for volatile organic compounds.
中文翻译：
亚稳态层状锰钴氧化物纳米片催化剂上的催化甲苯燃烧
采用静电自组装方法制备了一种用于甲苯燃烧的亚稳态层状结构的无贵金属催化剂。在这个过程中，过渡金属离子被带负电荷的氧化锰钴纳米片之间夹有一厚度为0.8纳米（M Ñ + / MnCoO，男Ñ +：锰2+，铁3+，钴2+和Cu 2+） . 对于 Cu 2+ /MnCoO观察到甲苯分解的最低温度 ( T 50 = 217 °C) ，其表现出与 0.27 wt% Pt 负载的 CeO 2 –ZrO 2催化剂几乎相同的活性。XPS 和 H 2-TPR 谱表明层间 Cu 2+离子有助于降低 Mn(IV)/Mn(III) 比并提高 MnCoO 纳米片的还原性，这在提高通过 Mars van Krevelen 氧化甲苯的催化活性方面发挥了重要作用机制。结果表明，由二维材料获得的亚稳态层状结构可以为制备用于挥发性有机化合物的改进的无贵金属燃烧催化剂开辟一条新途径。
更新日期：2021-12-01
中文翻译：
亚稳态层状锰钴氧化物纳米片催化剂上的催化甲苯燃烧
采用静电自组装方法制备了一种用于甲苯燃烧的亚稳态层状结构的无贵金属催化剂。在这个过程中，过渡金属离子被带负电荷的氧化锰钴纳米片之间夹有一厚度为0.8纳米（M Ñ + / MnCoO，男Ñ +：锰2+，铁3+，钴2+和Cu 2+） . 对于 Cu 2+ /MnCoO观察到甲苯分解的最低温度 ( T 50 = 217 °C) ，其表现出与 0.27 wt% Pt 负载的 CeO 2 –ZrO 2催化剂几乎相同的活性。XPS 和 H 2-TPR 谱表明层间 Cu 2+离子有助于降低 Mn(IV)/Mn(III) 比并提高 MnCoO 纳米片的还原性，这在提高通过 Mars van Krevelen 氧化甲苯的催化活性方面发挥了重要作用机制。结果表明，由二维材料获得的亚稳态层状结构可以为制备用于挥发性有机化合物的改进的无贵金属燃烧催化剂开辟一条新途径。
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