与CuO / CeO <sub>2</sub>介孔纳米片相比，烟灰氧化活性增强<a href="#fn1" title="提供电子补充信息（ESI）：反应系统的示意流程图，FESEM图像和压碎的CuCe7.2的催化性能，纯烟灰的烟灰氧化活性，进料组成对烟灰氧化活性的影响，接触方式对烟灰氧化的影响CuCe7.2对烟尘氧化的活性和稳定性测试。参见DOI：10.1039 / c8cy02605j">†</a>,Catalysis Science & Technology

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与CuO / CeO ₂介孔纳米片相比，烟灰氧化活性增强 †
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019-03-05 00:00:00 , DOI: 10.1039/c8cy02605j
Shuaifeng Yang _{1,

2,

3,

4} , Jinguo Wang _{1,

2,

3,

4} , Wei Chai _{4,

5,

6,

7} , Jian Zhu _{4,

8,

9,

10} , Yong Men _{1,

2,

3,

4}

Affiliation

开发用于消除烟灰的高活性催化剂已成为环境催化研究的热点。在此，CuO / CeO ₂介孔纳米片是通过水热法和湿法浸渍法合成的，旨在催化NO _x辅助的烟灰氧化。结果表明，以7.2 wt％CuO负载修饰的CeO ₂介孔纳米片表现出最佳的烟ot氧化活性，在NO浓度= 500 ppm，5.0％O的反应条件下，T _m为494°C，CO ₂选择性接近100％。₂ / N ₂和GHSV = ca。11400小时^-1。这种优异的活性可能与以下因素的协同作用有关：首先，片状形态和高表面积扩大了烟灰与催化剂之间的接触界面；其次，纳米片中的介孔通道不仅有利于气体反应物（NO和O ₂）的吸附和扩散，而且还扩大了催化剂与气体反应物（NO和O ₂）之间的接触界面。第三，氧化还原性能的改善和缺陷位点的丰富促进了氧种类的吸附和活化，也促进了NO生成NO _2的氧化能力的增强。参与烟灰氧化，从而提高烟灰氧化活性。同时，由于其高度稳定的晶相和强健的形态结构，该催化剂还显示出对结构塌陷的良好稳定性，证明了其在实际工作条件下的潜在应用。

"点击查看英文标题和摘要"

Enhanced soot oxidation activity over CuO/CeO2 mesoporous nanosheets†

Developing highly active catalysts for soot elimination has become a research hotspot in environmental catalysis. Herein, CuO/CeO₂ mesoporous nanosheets have been synthesized by combining hydrothermal and wet-impregnation methods, aiming to catalyze NO_x-assisted soot oxidation. Results indicate that CeO₂ mesoporous nanosheets decorated with 7.2 wt% CuO loading showed the best soot oxidation activity, giving a T_m of 494 °C and a nearly 100% CO₂ selectivity under reaction conditions of NO concentration = 500 ppm, 5.0% O₂/N₂ and GHSV = ca. 11 400 h⁻¹. This superior activity can be associated with the synergistic effect of the following factors: firstly, the sheet-shaped morphology together with high surface area enlarged the contact interface between soot and the catalyst; secondly, the mesoporous channels within nanosheets not only favored the enhanced adsorption and diffusion of gas reactants (NO and O₂), but also enlarged the contact interface between the catalyst and gas reactants (NO and O₂); thirdly, the improved redox properties and abundant defective sites facilitated the enhanced adsorption and activation of oxygen species and also favored the enhanced NO oxidation ability to generate NO₂ to take part in soot oxidation, thereby improving soot oxidation activity. Meanwhile, this catalyst also exhibited good stability against structural collapse owing to its highly stable crystal phase and robust morphological structure, demonstrating its potential applications under practical working conditions.

更新日期：2019-03-05

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