Insights into Coordinatively Unsaturated Aluminum Anchoring Pt Catalyst for Toluene Oxidation

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-08-21 DOI:10.1007/s10562-025-05135-0

Tao Wang, Shuangde Li, Yunfa Chen

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Abstract

The thermal stability of Pt particles is crucial for volatile organic compounds (VOCs) catalytic oxidation. Herein, a coordinated unsaturated aluminum (CUA) with abundant pentacoordinate Al³⁺ sites (Al^3 + _penta) stabilizing platinum catalyst was synthesized by the solution combustion method followed the incipient wetness impregnation method for VOCs degradation. The Pt particles exhibited well dispersion after 800 °C calcination, comparied with Pt loaded on commercial γ-Al₂O₃, detectd by SEM and TEM. The heat-resistant sintering was related to the anchoring of Pt by Al^3 + _penta proved by ²⁷Al NMR. The turnover frequency (TOF) of Pt/CUA for toluene oxidation was as high as 2.58 h^-1 under 60,000 ml^-1 g^-1 h^-1 and 5% water steam, which is about 2 times higher than that of Pt/γ-Al₂O₃. Furthermore, after 800 °C calcination, the TOF of Pt/CUA-800 was increased to 4.57 h^-1 in comparison with 0.4 h^-1 for Pt/γ-Al₂O₃-800. The excellent catalytic performance was maybe due to the Pt dispersion, low temperature reducibility and high surface chemsorbed oxygen species characterized by pulsed CO chemisorption, H₂-TPR and XPS. Anchorage effect of Al^3 + _penta on Pt metal was shown to be an effective strategy for the enhancement of VOCs composition.

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对甲苯氧化的配位不饱和铝锚定Pt催化剂的见解

Pt颗粒的热稳定性对挥发性有机化合物（VOCs）的催化氧化至关重要。本文采用溶液燃烧法和初湿浸渍法合成了具有丰富五配位Al3+位的配位不饱和铝（CUA）（Al3 +五配位）稳定铂催化剂，用于降解VOCs。经800℃煅烧后的Pt颗粒与载于γ-Al2O3上的Pt颗粒相比，具有良好的分散性。经27Al核磁共振证实，烧结的耐热性与Al3 +对Pt的锚定作用有关。在60000 ml-1 g-1 h-1和5%水蒸气条件下，Pt/CUA氧化甲苯的周转率（TOF）高达2.58 h-1，比Pt/γ-Al2O3高约2倍。经800℃煅烧后，Pt/CUA-800的TOF提高到4.57 h-1，而Pt/γ-Al2O3-800的TOF为0.4 h-1。优异的催化性能可能是由于铂的分散性、低温还原性和高表面化学吸附氧（通过脉冲CO化学吸附、H2-TPR和XPS表征）。Al3 + penta对Pt金属的锚定效应是提高VOCs组成的有效策略。图形抽象

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

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.