Ru/CeO2 Catalyst with Optimized CeO2 Support Morphology and Surface Facets for Propane Combustion,Environmental Science & Technology

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Ru/CeO2 Catalyst with Optimized CeO2 Support Morphology and Surface Facets for Propane Combustion
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-04-24 , DOI: 10.1021/acs.est.9b01929
Zheng Wang ₁ , Zhenpeng Huang ₁ , John T. Brosnahan ₂ , Sen Zhang ₂ , Yanglong Guo ₁ , Yun Guo ₁ , Li Wang ₁ , Yunsong Wang ₁ , Wangcheng Zhan ₁

Affiliation

Tailoring the interfaces between active metal centers and supporting materials is an efficient strategy to obtain a superior catalyst for a certain reaction. Herein, an active interface between Ru and CeO₂ was identified and constructed by adjusting the morphology of CeO₂ support, such as rods (R), cubes (C), and octahedra (O), to optimize both the activity and the stability of Ru/CeO₂ catalyst for propane combustion. We found that the morphology of CeO₂ support does not significantly affect the chemical states of Ru species but controls the interaction between the Ru and CeO₂, leading to the tuning of oxygen vacancy in the CeO₂ surface around the Ru–CeO₂ interface. The Ru/CeO₂ catalyst possesses more oxygen vacancy when CeO₂-R with predominantly exposed CeO₂{110} surface facets is used, providing a higher ability to adsorb and activate oxygen and propane. As a result, the Ru/CeO₂-R catalyst exhibits higher catalytic activity and stability for propane combustion compared with the Ru/CeO₂-C and Ru/CeO₂-O catalysts. This work highlights a new strategy for the design of efficient metal/CeO₂ catalysts by engineering morphology and associated surface facet of CeO₂ support for the elimination of light alkane pollutants and other volatile organic compounds.

中文翻译：

具有优化的CeO ₂支撑形态和表面刻面的Ru / CeO ₂催化剂，用于丙烷燃烧

量身定制活性金属中心和支撑材料之间的界面是一种有效的策略，可为特定反应获得优异的催化剂。本文中，通过调节CeO ₂载体（例如棒（R），立方体（C）和八面体（O））的形态来确定和构建Ru和CeO ₂之间的活性界面，以优化其活性和稳定性。 Ru / CeO ₂催化剂，用于丙烷燃烧。我们发现，CeO ₂支持物的形态不会显着影响Ru物种的化学状态，但可以控制Ru和CeO ₂之间的相互作用，从而导致Ru–CeO ₂周围CeO ₂表面的氧空位的调整。界面。当使用具有主要暴露的CeO ₂ {110}表面的CeO ₂ -R时，Ru / CeO ₂催化剂具有更多的氧空位，从而提供了更高的吸附和活化氧和丙烷的能力。结果，与Ru / CeO ₂ -C和Ru / CeO ₂ -O催化剂相比，Ru / CeO ₂ -R催化剂表现出更高的催化活性和丙烷燃烧稳定性。这项工作强调了通过工程形态和相关的CeO ₂载体表面来设计高效金属/ CeO ₂催化剂的新策略，以消除轻链烷烃污染物和其他挥发性有机化合物。

更新日期：2019-04-25

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