Establishing metal-nonoxygen bonds to improve thermal stability of Pt1/CeO2 via coating boron nitride

IF 4.1 2区工程技术 Q2 ENGINEERING, CHEMICAL Chemical Engineering Science Pub Date : 2024-10-22 DOI:10.1016/j.ces.2024.120856

Qi Zhang , Xuan Tang , Yuwei Zhou , Yujie Shi , Lijun Ni , Jing Xu , Chengsi Pan , Ying Zhang , Bin Mu , Yun Guo , Yang Lou

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Abstract

Supported metal catalysts are pivotal in the chemical industry, but achieving high activity while maintaining atomically dispersed status to maximize atom efficiency under harsh conditions remains a formidable challenge. In this study, we present a synthetic strategy to enhance the stability of ceria-supported Pt catalysts by coating them with an inert layer of boron nitride (Pt₁/CeO₂@BN). The BN layer serves to stabilize and modulate the dispersion and electronic state of Pt species, as well as the oxygen vacancy concentration of CeO₂. Consequently, the Pt₁/CeO₂@BN catalyst maintained the atomically dispersed status of Pt species under high-temperature oxidative (900 °C for 3.5 h in air) and reductive (1000 °C for 1 h in H₂) conditions and increased the turnover frequency for CO oxidation by four times at 140 °C. Our work offers a valuable strategy to enhance the thermal stability of supported metal catalysts under harsh reaction conditions.

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通过氮化硼涂层建立金属-非氧键以提高 Pt1/CeO2 的热稳定性

支撑金属催化剂在化学工业中举足轻重，但要在苛刻条件下实现高活性，同时保持原子分散状态以最大限度地提高原子效率，仍然是一项艰巨的挑战。在本研究中，我们提出了一种合成策略，通过在铈支撑铂催化剂上涂覆一层惰性氮化硼层（Pt1/CeO2@BN）来增强其稳定性。氮化硼层的作用是稳定和调节铂物种的分散和电子状态，以及 CeO2 的氧空位浓度。因此，Pt1/CeO2@BN 催化剂在高温氧化（900 °C，空气中 3.5 小时）和还原（1000 °C，H2 中 1 小时）条件下保持了铂物种的原子分散状态，并将 140 °C 下 CO 氧化的翻转频率提高了四倍。我们的工作为提高支撑金属催化剂在苛刻反应条件下的热稳定性提供了一种有价值的策略。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.