多孔 CeO2 上均匀分散的纳米钯镍氧化物及其在双燃料发动机尾气甲烷转化中的应用

IF 3.8 3区 化学 Q2 CHEMISTRY, PHYSICAL
Catalysts Pub Date : 2023-12-28 DOI:10.3390/catal14010024
Chunlian Luo, Luwei Chen, Abdullah N. Alodhayb, Jianhua Wu, Mingwu Tan, Yanling Yang
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引用次数: 0

摘要

开发用于低温甲烷燃烧的催化剂对于解决温室效应问题至关重要。有效的工业催化剂战略包括优化贵金属利用和促进金属间相互作用。本文采用自组装法合成了 PdNi-H 催化剂,与采用浸渍法制备的催化剂相比,该催化剂实现了钯原子和镍原子的高度分散和接近,EDS 图谱证实了这一点。XRD 和 TEM 结果显示,Pd2+ 和 Ni2+ 在 CeO2 晶格中掺杂,导致畸变并形成 Pd-O-Ce 或 Ni-O-Ce 结构。这些结构促进了 CeO2 中氧空位的形成,拉曼和 XPS 结果进一步证实了这一点。因此,PdNi-H 催化剂表现出了出色的氧化还原能力和催化活性,分别在 282 和 387 °C 的温度下实现了较低的点火温度和甲烷完全燃烧温度。高度分散的 PdNi 物种在活化甲烷以提高氧化还原能力方面发挥了关键作用。此外,正如 XPS 结果所证实的那样,窄尺寸分布范围有助于在 CeO2 表面形成更多空位,从而促进气相氧的活化,形成氧物种(O2-)。这种合作催化方法为开发低温下高效稳定的甲烷燃烧催化剂提供了一种前景广阔的策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Uniformly Dispersed Nano Pd-Ni Oxide Supported on Polyporous CeO2 and Its Application in Methane Conversion of Tail Gas from Dual-Fuel Engine
The development of catalysts for low-temperature methane combustion is crucial in addressing the greenhouse effect. An effective industrial catalyst strategy involves optimizing noble metal utilization and boosting metal–metal interaction. Here, the PdNi-H catalyst was synthesized using the self-assembly method, achieving the high dispersion and close proximity of Pd and Ni atoms compared to the counterparts prepared by the impregnation method, as confirmed by EDS mapping. The XRD and TEM results revealed Pd2+ and Ni2+ doping within the CeO2 lattice, causing distortions and forming Pd-O-Ce or Ni-O-Ce structures. These structures promoted oxygen vacancy formation in CeO2, and this was further confirmed by the Raman and XPS results. Consequently, the PdNi-H catalyst demonstrated an excellent redox ability and catalytic activity, achieving lower ignition and complete methane burning temperatures at 282 and 387 °C, respectively. The highly dispersed PdNi species played a pivotal role in activating methane for enhanced redox ability. Additionally, the narrow size distribution range contributed to more vacancies on the surface of CeO2, as confirmed by the XPS results, thereby facilitating the activation of gas phase oxygen to form oxygen species (O2−). This collaborative catalytic approach presents a promising strategy for developing efficient and stable methane combustion catalysts at low temperatures.
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来源期刊
Catalysts
Catalysts CHEMISTRY, PHYSICAL-
CiteScore
6.80
自引率
7.70%
发文量
1330
审稿时长
3 months
期刊介绍: Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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