Enhanced oxygen mobility in NiAg alloy catalysts for methane dry reforming: The role of AgO nanoparticles

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2025-04-10 DOI:10.1016/j.cattod.2025.115316

Alberth Renne Gonzalez Caranton , Ananda Vallezi Paladino Lino , Calazans Macchiutti , Jilder Dandy Peña serna , Noemi Raquel Checca Huaman , Fernando stavale , Emilia Annese , José Mansur Assaf

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Abstract

This study investigates the effect of AgO nanoparticles on oxygen mobility and catalytic performance in NiAg bimetallic alloy catalysts during the dry reforming of methane (DMR). Using sol-gel synthesized NiAgMgAl hydrotalcite precursors, the resulting catalysts were evaluated at 800 °C and 1 atm. AgO species were found to prevent sintering and protect nickel active sites under high-temperature conditions. Characterization techniques such as Near Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS) and Electron paramagnetic resonance (EPR) spectroscopy revealed distinct electrochemical properties related to oxygen vacancies, critical for methane and CO₂ activation. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) confirmed efficient CH₄ and CO₂ activation, showcasing silver’s role in improving catalytic turnover frequency and preventing coke formation. The findings demonstrate that the NiAg alloy’s oxygen vacancies and nanoconfinement effects significantly enhance DRM performance, offering a promising strategy for syngas production.

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甲烷干重整NiAg合金催化剂中氧迁移率的增强：AgO纳米颗粒的作用

本研究探讨了 AgO 纳米颗粒对甲烷干转化（DMR）过程中 NiAg 双金属合金催化剂中氧迁移率和催化性能的影响。使用溶胶凝胶合成的 NiAgMgAl 氢滑石前驱体，在 800 °C 和 1 atm 的条件下对生成的催化剂进行了评估。在高温条件下，AgO 物种可防止烧结并保护镍活性位点。近常压 X 射线光电子能谱 (NAP-XPS) 和电子顺磁共振 (EPR) 光谱等表征技术揭示了与氧空位有关的独特电化学特性，而氧空位对甲烷和 CO₂ 的活化至关重要。漫反射红外傅立叶变换光谱（DRIFTS）证实了 CH₄ 和 CO₂ 的高效活化，显示了银在提高催化周转频率和防止焦炭形成方面的作用。研究结果表明，镍银合金的氧空位和纳米掺杂效应显著提高了 DRM 的性能，为合成气生产提供了一种前景广阔的策略。

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.