Design of Bifunctional Cu-SSZ-13@Mn2Cu1Al1Ox Core–Shell Catalyst with Superior Activity for the Simultaneous Removal of VOCs and NOx,Environmental Science & Technology

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Design of Bifunctional Cu-SSZ-13@Mn2Cu1Al1Ox Core–Shell Catalyst with Superior Activity for the Simultaneous Removal of VOCs and NOx
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-11-13 , DOI: 10.1021/acs.est.3c04421
Zhe Li _{1,

2} , Jiewen Xiao _{1,

2} , Yanshan Gao _{1,

2} , Rongrong Gui _{1,

2} , Qiang Wang _{1,

2}

Affiliation

Synchronous control of volatile organic compounds (VOCs) and nitrogen oxides (NO_x) is of great importance for ozone and PM_2.5 pollution control. Balancing VOC oxidation and the NH₃–SCR reaction is the key to achieving the simultaneous removal of these two pollutants. In this work, a vertically oriented Mn₂Cu₁Al₁O_x nanosheet is grown in situ on the surface of Cu-SSZ-13 to synthesize a core–shell bifunctional catalyst (Cu-SSZ-13@Mn₂Cu₁Al₁O_x) with multiple active sites. The optimized Cu-SSZ-13@Mn₂Cu₁Al₁O_x catalyst delivered excellent performance for the simultaneous removal of VOCs and NO_x with both 100% conversion at 300 °C in the presence of 5% water vapor. Physicochemical characterization and density functional theory (DFT) calculations revealed that Cu-SSZ-13@Mn₂Cu₁Al₁O_x possesses more surface acidity and oxygen vacancies. The charge transfer between the core and shell is the intrinsic reason for the improved activity for both VOC and NO_x removal. The molecular orbital theory is used to explain the different adsorption energies due to the different bonding modes between the core–shell and mixed individual catalysts. This work provides a novel strategy for designing efficient catalysts for the simultaneous removal of VOCs and NO_x or other multiple pollutants.

中文翻译：

具有优异活性同时去除VOCs和NOx的双功能Cu-SSZ-13@Mn2Cu1Al1Ox核壳催化剂的设计

挥发性有机物（VOCs）和氮氧化物（NO _x ）的同步控制对于臭氧和PM _2.5污染控制具有重要意义。平衡VOC氧化和NH ₃ –SCR反应是实现这两种污染物同时去除的关键。在这项工作中，垂直取向的Mn ₂ Cu ₁ Al ₁ O _x纳米片在Cu-SSZ-13表面原位生长，合成了核壳双功能催化剂（Cu-SSZ-13@Mn ₂ Cu ₁ Al ₁ O _x ) 具有多个活性位点。优化的 Cu-SSZ-13@Mn ₂ Cu ₁ Al ₁ O _x催化剂在同时去除 VOC 和 NO _x方面具有优异的性能，在 300 °C、5% 水蒸气存在下均实现 100% 转化。物理化学表征和密度泛函理论（DFT）计算表明Cu-SSZ-13@Mn ₂ Cu ₁ Al ₁ O _x具有更多的表面酸性和氧空位。核和壳之间的电荷转移是提高 VOC 和 NO _x去除活性的内在原因。分子轨道理论用于解释由于核壳和混合单个催化剂之间不同的键合模式而导致的不同吸附能。这项工作为设计同时去除挥发性有机化合物和氮_氧化物或其他多种污染物的高效催化剂提供了一种新颖的策略。

更新日期：2023-11-13

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