Enhanced low-temperature activity of Rh-Pt alloy clusters supported on TiO2/Ti nanosheets for selective catalytic reduction of NO by CO

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-02-27 DOI:10.1016/j.apsusc.2025.162824

Liu Yang, Xinyu Li, Hanze He, Tingting Liu, Weizhen Wang, Zhiqing Yang, Song Li, Jing Li, Baodan Liu

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Abstract

Achieving high catalytic activity at low temperatures in the selective catalytic reduction of NO by CO (CO-SCR) remains a significant challenge, primarily due to the inhibitory effect of O₂, which hampers the NO reduction process. In this study, we designed Rh-Pt alloy clusters supported on TiO₂ nanosheets to optimize the CO-SCR performance. Among the catalysts investigated, Rh1Pt1/TiO₂/Ti demonstrated exceptional low-temperature catalytic performance. Under 0.15 % O₂ conditions, the Rh1Pt1/TiO₂/Ti catalyst achieved complete NO conversion at 180 °C, outperforming both Rh1/TiO₂/Ti and Pt1/TiO₂/Ti catalysts. Characterization results revealed the strong interaction between Rh, Pt and TiO₂ optimizes electron transfer, enhances overall catalytic activity and promotes efficient adsorption and activation of both CO and NO. Specifically, Rh facilitates the adsorption and dissociation of NO, while Pt enhances CO adsorption and transformation. Based on in-situ FTIR experiments and DFT calculations, a possible reaction mechanism for the Rh-Pt/TiO₂/Ti catalyst in CO-SCR was proposed. This study provides valuable insights for the exploration and development of CO-SCR catalysts towards industrial application.

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在一氧化碳选择性催化还原一氧化氮（CO-SCR）过程中，在低温下实现高催化活性仍然是一项重大挑战，这主要是由于氧气的抑制作用阻碍了一氧化氮的还原过程。在本研究中，我们设计了支撑在 TiO2 纳米片上的 Rh-Pt 合金团簇，以优化 CO-SCR 性能。在所研究的催化剂中，Rh1Pt1/TiO2/Ti 表现出优异的低温催化性能。在 0.15%O2 条件下，Rh1Pt1/TiO2/Ti 催化剂在 180 °C 时实现了完全的氮氧化物转化，性能优于 Rh1/TiO2/Ti 和 Pt1/TiO2/Ti催化剂。表征结果表明，Rh、Pt 和 TiO2 之间的强相互作用优化了电子传递，提高了整体催化活性，促进了 CO 和 NO 的高效吸附和活化。具体来说，Rh 促进了 NO 的吸附和解离，而 Pt 则增强了 CO 的吸附和转化。根据原位傅立叶变换红外实验和 DFT 计算，提出了 Rh-Pt/TiO2/Ti 催化剂在 CO-SCR 中的可能反应机理。这项研究为探索和开发面向工业应用的 CO-SCR 催化剂提供了宝贵的见解。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.