Enhanced Ammonia Synthesis Performance over Ru-Based Catalysts via the Addition of Ce Promoter

IF 3.8 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2025-04-23 DOI:10.1021/acs.iecr.4c04868

Tianhua Zhang, Kexin Yue, Jiangyang Mo, Mingyuan Zhang, Jie Zhu, Ruting Lin, Shiyong Zhang, Ruishao Mao, Yanliang Zhou, Jun Ni, Jianxin Lin, Xiuyun Wang, Lilong Jiang

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Abstract

The development of advanced catalysts is critical to realize efficient ammonia (NH₃) synthesis under mild conditions. However, the activation of an inert N≡N bond in N₂ molecules is the primary hindrance to NH₃ synthesis, and hydrogen poisoning is another major and a serious problem, especially in Ru-based catalysts. Here, we develop an H-ZSM-5-supported Ru-based catalyst (Ce–Ru/HZ) via decorating with a CeO₂ promoter to realize efficient NH₃ synthesis. Our study shows that the Ce species can serve as an electron donor to enrich the electron density of Ru sites, thus accelerating N₂ activation for NH₃ synthesis. Meanwhile, the interaction of Ru and Ce can alleviate the effect of hydrogen poisoning on Ru sites. Consequently, the 16 wt % Ce-promoted Ru/HZ catalyst displays a superior NH₃ synthesis rate and long-term stability of more than 550 h at 400 °C and 1 MPa.

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添加Ce促进剂提高ru基催化剂合成氨性能

先进催化剂的开发是实现温和条件下高效氨合成的关键。然而，N2分子中惰性N≡N键的激活是NH3合成的主要障碍，氢中毒是另一个主要和严重的问题，特别是在钌基催化剂中。本文采用CeO2促进剂修饰h - zsm -5负载的ru基催化剂（Ce-Ru /HZ），实现了NH3的高效合成。我们的研究表明，Ce可以作为电子供体来丰富Ru位点的电子密度，从而加速N2活化以合成NH3。同时，Ru和Ce的相互作用可以缓解氢中毒对Ru位点的影响。因此，16 wt % ce促进的Ru/HZ催化剂表现出优异的NH3合成速率和在400°C和1 MPa下超过550 h的长期稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.