A Facile Strategy for Pt Redispersion on TiO2 for Enhanced SMSI Effect and Low-Temperature Reducibility

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-06-28 DOI:10.1007/s10562-024-04748-1

Gangguo Zhao, Di Zhang, Jianshen Wang, Dan Liu, Fengying Jin, Bin Li, Shiguang Pan, Jiazhong Zang, JianZhou Gui

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Abstract

Particle size is critical in determining the catalytic behavior of noble metal catalysts. It is a significant interest for the rational design of clearly defined catalyst materials to research on noble metal nanoparticles. Herein, a facile prepared method for the Pt/TiO₂ catalysts can not only potentially benefit the reuse of industrial catalysts, but also help to reduce the cost of VOC catalytic oxidation. In this work, the calcination of Pt/TiO₂ catalyst under N₂ atmosphere achieves the redispersion of large Pt particles into small ones (~ 1.4 nm). The Pt/TiO₂-400 catalyst (calcinated at 400 °C) with smaller Pt particles and higher concentration of active sites has superior catalytic activity and stability of toluene oxidation, contributing to the strong metal-support interaction, the larger effective metal surface area, the excellent low-temperature reducibility, abundant amounts of Pt⁰ species and adsorbed oxygen species. This work provides a facile method for metal redispersion of the catalysts, maintaining high activity and excellent stability.

Graphical Abstract

Abstract Image

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在二氧化钛上进行铂再分散以增强 SMSI 效应和低温还原性的简便策略

颗粒大小是决定贵金属催化剂催化行为的关键。研究贵金属纳米颗粒对合理设计定义明确的催化剂材料具有重要意义。在此，一种简便的 Pt/TiO2 催化剂制备方法不仅有利于工业催化剂的重复使用，还有助于降低 VOC 催化氧化的成本。在这项工作中，在 N2 气氛下煅烧 Pt/TiO2 催化剂实现了大 Pt 颗粒向小颗粒（约 1.4 nm）的再分散。铂颗粒更小、活性位点浓度更高的 Pt/TiO2-400 催化剂（煅烧温度为 400 °C）具有更高的甲苯氧化催化活性和稳定性，这得益于其强大的金属-支撑相互作用、更大的有效金属比表面积、优异的低温还原性、大量的 Pt0 物种和吸附的氧物种。这项工作为催化剂的金属再分散提供了一种简便的方法，同时保持了催化剂的高活性和优异的稳定性。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.