Influence of Doping of Niobium Oxide on the Catalytic Activity of Pt/Al2O3 for CO Oxidation

IF 2.8 3区化学 Q2 CHEMISTRY, APPLIED

Topics in Catalysis Pub Date : 2024-03-29 DOI:10.1007/s11244-024-01924-w

Le Yu, Yejin Song, Seunghwa Hong, Zhaoyi Xu, Shourong Zheng, Jeong Young Park

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Abstract

Pt-based alumina catalysts doped with varying niobium contents (i.e., 0, 1.20, 2.84, and 4.73 wt%, denoted as Pt/Nb–Al₂O₃) were synthesized via stepwise impregnation for catalytic CO oxidation. The effective incorporation of Nb species without altering the fundamental properties of the Al₂O₃ support was confirmed by the characterization using XRD, Raman, and TEM. Pt metallic particles were uniformly deposited on the niobium-doped alumina (Nb–Al₂O₃) support. H₂-TPR and CO–TPD analyses were performed to reveal the influence of niobium doping on catalyst reduction and CO adsorption properties. The results consistently demonstrate that the doping of niobium affects reducibility and alleviates the competitive adsorption between CO and O₂ during the CO reaction. Particularly, when compared to both undoped and excessively doped Pt/Al₂O₃ catalysts, the catalyst featuring a 2.84 wt% Nb content on Pt_1.4/Nb_2.8–Al₂O₃ displayed the most promising catalytic performance, with a turnover frequency of 3.12 s⁻¹ at 180 °C. This superior performance can be attributed to electron transfer at the Pt/NbOx interface.

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掺杂氧化铌对 Pt/Al2O3 氧化 CO 催化活性的影响

通过逐步浸渍法合成了掺杂不同铌含量（即 0、1.20、2.84 和 4.73 wt%，记为 Pt/Nb-Al2O3）的铂基氧化铝催化剂，用于催化 CO 氧化。通过 XRD、拉曼和 TEM 表征证实，Nb 物种的有效加入不会改变 Al2O3 支持物的基本特性。铂金属颗粒均匀地沉积在掺铌氧化铝（Nb-Al2O3）载体上。通过 H2-TPR 和 CO-TPD 分析，揭示了掺铌对催化剂还原和 CO 吸附性能的影响。结果一致表明，掺杂铌会影响还原性，并减轻 CO 反应过程中 CO 和 O2 之间的竞争性吸附。特别是，与未掺杂和过度掺杂的 Pt/Al2O3 催化剂相比，Pt1.4/Nb2.8-Al2O3 上铌含量为 2.84 wt%的催化剂显示出最理想的催化性能，在 180 °C 时的翻转频率为 3.12 s-1。这种优异的性能可归因于 Pt/NbOx 界面的电子转移。

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

Topics in Catalysis 化学-物理化学

CiteScore

5.70

自引率

5.60%

发文量

197

审稿时长

2 months

期刊介绍： Topics in Catalysis publishes topical collections in all fields of catalysis which are composed only of invited articles from leading authors. The journal documents today’s emerging and critical trends in all branches of catalysis. Each themed issue is organized by renowned Guest Editors in collaboration with the Editors-in-Chief. Proposals for new topics are welcome and should be submitted directly to the Editors-in-Chief. The publication of individual uninvited original research articles can be sent to our sister journal Catalysis Letters. This journal aims for rapid publication of high-impact original research articles in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.