Steam Treatment Promotion on the Performance of Pt/CeO2 Three-Way Catalysts for Emission Control of Natural Gas-Fueled Vehicles

IF 3.8 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysts Pub Date : 2023-12-25 DOI:10.3390/catal14010017

Xi Liu, Yuankai Shao, Xiaoning Ren, Anqi Dong, Kaixiang Li, Bingjie Zhou, Chunqing Yang, Yatao Liu, Zhenguo Li

{"title":"Steam Treatment Promotion on the Performance of Pt/CeO2 Three-Way Catalysts for Emission Control of Natural Gas-Fueled Vehicles","authors":"Xi Liu, Yuankai Shao, Xiaoning Ren, Anqi Dong, Kaixiang Li, Bingjie Zhou, Chunqing Yang, Yatao Liu, Zhenguo Li","doi":"10.3390/catal14010017","DOIUrl":null,"url":null,"abstract":"Three-way catalyst (TWC) is the mainstream technology for stoichiometric natural gas vehicle gas emission purification to meet the China VI emission standard for heavy-duty vehicles. Due to the high price of Pd-Rh TWC widely used at present, it is of great significance to develop cheaper Pt-only catalysts as substitutes. However, there are few studies on Pt-only TWC, especially for natural gas vehicles. It remains a formidable challenge to develop Pt-only TWC with excellent activity and stability. In this study, we significantly improved the catalytic performance of Pt/CeO2 TWC through thermal treatment, especially steam treatment at 800 °C, and used XRD, TEM, H2-TPR, and XPS techniques to investigate how Pt/CeO2 can be activated via these treatments. Our results suggested that after these treatments, CeO2 crystallites sintered slightly, while platinum particles remained highly dispersed. Moreover, these treatments also weakened the Pt-CeO2 interaction, promoted the formation of oxygen vacancies in CeO2 support, and generated a new type of active surface oxygen in the vicinity of Ptδ+, thus improving the activity of the catalyst. After 800 °C steam treatment, the T50 of CH4 and NO decreased by 31 and 36 °C, respectively. The results obtained in this study provide implications for the synthesis of efficient Pt-based catalysts.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"8 2","pages":""},"PeriodicalIF":3.8000,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysts","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.3390/catal14010017","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Three-way catalyst (TWC) is the mainstream technology for stoichiometric natural gas vehicle gas emission purification to meet the China VI emission standard for heavy-duty vehicles. Due to the high price of Pd-Rh TWC widely used at present, it is of great significance to develop cheaper Pt-only catalysts as substitutes. However, there are few studies on Pt-only TWC, especially for natural gas vehicles. It remains a formidable challenge to develop Pt-only TWC with excellent activity and stability. In this study, we significantly improved the catalytic performance of Pt/CeO2 TWC through thermal treatment, especially steam treatment at 800 °C, and used XRD, TEM, H2-TPR, and XPS techniques to investigate how Pt/CeO2 can be activated via these treatments. Our results suggested that after these treatments, CeO2 crystallites sintered slightly, while platinum particles remained highly dispersed. Moreover, these treatments also weakened the Pt-CeO2 interaction, promoted the formation of oxygen vacancies in CeO2 support, and generated a new type of active surface oxygen in the vicinity of Ptδ+, thus improving the activity of the catalyst. After 800 °C steam treatment, the T50 of CH4 and NO decreased by 31 and 36 °C, respectively. The results obtained in this study provide implications for the synthesis of efficient Pt-based catalysts.

查看原文本刊更多论文

蒸汽处理对用于天然气燃料汽车排放控制的 Pt/CeO2 三元催化剂性能的促进作用

三元催化器（TWC）是为满足重型汽车国六排放标准而采用的化学计量天然气汽车废气净化主流技术。由于目前广泛使用的 Pd-Rh 三元催化器价格昂贵，因此开发更便宜的纯铂催化剂作为替代品具有重要意义。然而，有关纯铂 TWC 的研究很少，尤其是针对天然气汽车的研究。开发具有优异活性和稳定性的纯铂 TWC 仍是一项艰巨的挑战。在本研究中，我们通过热处理，特别是 800 °C 蒸汽处理，大大提高了 Pt/CeO2 TWC 的催化性能，并使用 XRD、TEM、H2-TPR 和 XPS 技术研究了如何通过这些处理活化 Pt/CeO2。我们的研究结果表明，经过这些处理后，CeO2 结晶轻微烧结，而铂颗粒仍然高度分散。此外，这些处理还削弱了铂-CeO2 的相互作用，促进了 CeO2 载体中氧空位的形成，并在 Ptδ+ 附近生成了新型活性表面氧，从而提高了催化剂的活性。经过 800 ℃ 蒸汽处理后，CH4 和 NO 的 T50 分别降低了 31 ℃ 和 36 ℃。本研究获得的结果为合成高效的铂基催化剂提供了启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

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.