通过战略性 Pt-Cu 合金化优先暴露铂原子来增强苯的燃烧活性,Langmuir

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通过战略性 Pt-Cu 合金化优先暴露铂原子来增强苯的燃烧活性
Langmuir ( IF 3.7 ) Pub Date : 2023-10-19 , DOI: 10.1021/acs.langmuir.3c02345
Wen Chen ₁ , Zhiwei Huang ₁ , Jiangwei Ni ₁ , Qiqi Zhou ₁ , Xiaomin Wu ₁ , Huazhen Shen ₁ , Huawang Zhao ₁ , Guohua Jing ₁

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苯等挥发性有机化合物是有害的空气污染物，需要有效消除。贵金属基催化剂表现出高苯燃烧活性，但其成本高昂，需要采取提高利用效率的策略。本研究研究了一种 Pt-Cu 合金催化剂，通过铜合金化优先暴露 Pt 活性位点，以改善苯的燃烧。像差校正扫描透射电子显微镜和 X 射线光谱表征了 Pt 在合金表面的纳米级分布和富集。动力学测量表明，与 Pt 催化剂相比，其活性显着增强，这归因于 Pt 金属位点暴露的增加，而不是反应机制的改变。原位傅里叶变换红外（FTIR）光谱显示合金中存在较高丰度的梯田状 Pt 位点，有利于苯的吸附。分压依赖性分析表明苯和 O ₂的竞争吸附遵循 Langmuir-Hinshelwood 动力学。这些发现为调整双金属催化剂的表面组成以优化贵金属效率提供了概念性见解，并具有可持续催化工艺进步的广泛适用性。

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Enhancing Benzene Combustion Activity through Preferential Platinum Atom Exposure via Strategic Pt–Cu Alloying

Volatile organic compounds such as benzene are hazardous air pollutants that require effective elimination. Noble metal-based catalysts exhibit high benzene combustion activity, but their prohibitive cost necessitates strategies to enhance utilization efficiency. This study investigates a Pt–Cu alloy catalyst for improved benzene combustion by preferentially exposing Pt active sites through Cu alloying. Aberration-corrected scanning transmission electron microscopy and X-ray spectroscopy characterize the nanoscale distribution and enrichment of Pt on the alloy surface. Kinetic measurements demonstrate substantially enhanced activity compared with Pt catalysts, attributed to increased Pt metallic site exposure rather than alteration of the reaction mechanism. In situ Fourier transform infrared (FTIR) spectroscopy reveals a higher abundance of terrace-like Pt sites in the alloy, beneficial for benzene adsorption. Partial pressure dependence analyses indicate competitive adsorption of benzene and O₂, following Langmuir–Hinshelwood kinetics. These findings provide conceptual insights into tuning surface composition in bimetallic catalysts to optimize noble metal efficiency, with broad applicability for sustainable catalytic process advancement.

更新日期：2023-10-19

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