Low Ag concentration Ag/CeO2 catalysts prepared with various CeO2 precursors in carbon monoxide oxidation reaction

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-09-04 DOI:10.1007/s10562-024-04774-z

Elena Y. Liberman, Elena I. Suvorova, Alexander Y. Vasil’kov, Anastasiia A. Voronova, Alexander. Y. Pereyaslavtsev, Tatiana V. Kon’kova

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Abstract

Ag/CeO₂ catalysts for the CO oxidation reaction were synthesized by the metal-vapor method. Highly dispersed cerium dioxide used as a carrier was obtained by precipitation of Ce⁺³ ions with various (NH₄OH, (NH₄)₂CO₃ and H₂C₂O₄) precipitators and subsequent calcination in an oxidizing atmosphere. CeO₂ particles were formed with different morphologies depending on the precipitator used. When using NH₄OH, mainly spheroidal particles are formed, while the shape of platelets is typical for the use of H₂C₂O₄. The samples were characterized by EDX, SEM, TEM, XPS, low-temperature nitrogen adsorption. Catalytic testing of the samples was carried out in an oxidation reaction using gas chromatography. It was found that the catalytic activity of the samples decreases in a series Ag/CeO_2carb > Ag/CeO_2oxal > Ag/CeO_2hydr. Ag/CeO_2oxal catalysts demonstrated relatively high activity and the most stable operation over 10 cycles.

Graphical Abstract

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一氧化碳氧化反应中使用各种 CeO2 前驱体制备的低银浓度 Ag/CeO2 催化剂

采用金属蒸气法合成了用于 CO 氧化反应的 Ag/CeO2 催化剂。通过使用各种沉淀剂（NH4OH、(NH4)2CO3 和 H2C2O4）沉淀 Ce+3 离子并随后在氧化气氛中煅烧，获得了用作载体的高度分散的二氧化铈。所使用的沉淀剂不同，形成的 CeO2 颗粒形态也不同。使用 NH4OH 时，主要形成球形颗粒，而使用 H2C2O4 时则形成典型的板状颗粒。样品的表征方法有：EDX、SEM、TEM、XPS、低温氮吸附。利用气相色谱法在氧化反应中对样品进行了催化测试。结果发现，样品的催化活性在 Ag/CeO2carb > Ag/CeO2oxal > Ag/CeO2hydr > Ag/CeO2hydr > 系列中依次降低。Ag/CeO2oxal 催化剂的活性相对较高，在 10 个循环中运行最稳定。

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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.