Ag/Eggshell Nanocatalyst for Sustainable Ethylbenzene Oxidation: Synthesis, Characterization, and Performance

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2025-04-09 DOI:10.1007/s10562-025-05002-y

Sara Vafadar, Saeed Jafari, Saeed Yousefinejad, Hossein Kazemian, Esmaeel Soleimani

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Abstract

Catalytic oxidation is one of the most effective technologies for controlling volatile organic compounds (VOCs) due to its environmental friendliness and energy efficiency. Supported noble metal nanostructures are among the most commonly used catalysts, exhibiting high activity, durable stability, poison tolerance, and easy regeneration. The solid, hierarchical, and porous structure of eggshell makes it an excellent support for dispersing and stabilizing nanoparticles. In this study, an Ag/eggshell catalyst was synthesized by the impregnation method in an aqueous medium and characterized using SEM, TEM, XRD, and FTIR. The XRD results revealed the diffraction peaks of silver nanoparticles, and TEM analysis showed an average nanoparticle size of 52 ± 11 nm. The effects of different synthesis and operational factors on the catalytic activity for ethylbenzene oxidation were investigated in a gas matrix at various temperatures. Catalysts synthesized with Ag/Ca molar ratios of 10.8%, 19.9%, and 34.3% resulted in t₉₀ (temperature for 90% conversion) at 204, 226, and 283 °C, respectively. An increase in relative humidity from 0 to 40% led to an increase in t₉₀ from 201 to 275 °C. In conclusion, Ag/eggshell catalysts demonstrate significant potential for the oxidation of airborne ethylbenzene in occupational settings.

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用于乙苯可持续氧化的Ag/蛋壳纳米催化剂：合成、表征和性能

催化氧化以其环保、节能的特点成为控制挥发性有机物（VOCs）最有效的技术之一。负载型贵金属纳米结构是最常用的催化剂之一，具有高活性、持久稳定、耐毒、易于再生等特点。蛋壳的固体、分层和多孔结构使其成为分散和稳定纳米颗粒的良好支撑。本研究在水介质中采用浸渍法制备了Ag/蛋壳催化剂，并采用SEM、TEM、XRD、FTIR对其进行了表征。XRD结果显示银纳米粒子的衍射峰，TEM分析显示银纳米粒子的平均粒径为52±11 nm。研究了不同合成条件和操作条件对乙苯氧化催化活性的影响。当Ag/Ca摩尔比分别为10.8%、19.9%和34.3%时，催化剂的t₉₀（90%转化温度）分别为204、226和283℃。相对湿度从0增加到40%导致t₉0从201增加到275°C。综上所述，银/蛋壳催化剂在职业环境中对空气中乙苯的氧化表现出显著的潜力。图形抽象

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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.