Role of Tungsten Modification in Regulating Brønsted Acid-Site Retention and Catalytic Stability of Sulfated Titania

IF 2.5 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2026-10-18 DOI:10.1007/s10562-026-05550-x

Khyrullah Khan, Wei Wang, Xinxue Li, Zhidong Chang, Bin Dong

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引用次数: 0

Abstract

The durability of solid acid catalysts is often limited by the loss of accessible acid sites during catalytic operation. In this work, tungsten-modified sulfated titania (WST) was developed for the transesterification of ethyl acetate with n-butanol, and its post-reaction accessible Brønsted acid-site retention behavior was evaluated using the Dynamic Brønsted Acid Retention (DBAR) descriptor based on ex situ pyridine-FTIR analysis. Structural characterization confirmed the preservation of the anatase TiO₂ framework and the high dispersion of tungsten species without detectable crystalline WO₃ phases. Pyridine adsorption indicated the retention of accessible Brønsted acid sites after reaction. The WST catalyst maintained a higher DBAR value (48.1% after 3 h) compared with sulfated titania (30.4%), resulting in improved catalytic performance with 86.41% conversion compared with 77.11% for ST. The improved catalytic performance of WST is associated with the combined effects of higher initial accessible acidity, improved preservation of acidic sites during reaction, and tungsten-induced modification of the surface acidic environment. This work highlights tungsten modification as an effective strategy for designing more stable solid acid catalysts.

Graphical Abstract

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钨改性在调节Brønsted酸位保留和硫酸氧化钛催化稳定性中的作用

固体酸催化剂的耐久性通常受到催化操作过程中可接近酸位损失的限制。在这项工作中，开发了钨改性硫酸钛（WST）用于乙酸乙酯与正丁醇的酯交换反应，并使用基于非原位吡啶- ftir分析的动态Brønsted酸保留（DBAR）描述子评估了其反应后可接近的Brønsted酸位保留行为。结构表征证实了锐钛矿型TiO2框架的保存和钨种的高度分散，没有检测到结晶WO3相。吡啶吸附表明反应后可触及的Brønsted酸位保留。WST催化剂在3 h后保持了较高的DBAR值（48.1%），高于硫酸氧化钛（30.4%），从而提高了86.41%的催化转化率，而st的转化率为77.11%。WST催化性能的提高与较高的初始可及酸度、反应过程中酸性位点的更好保存以及钨诱导表面酸性环境的修饰等综合作用有关。这项工作强调钨改性是设计更稳定的固体酸催化剂的有效策略。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.