Lewis Acid Sites Stabilized Nickel Catalysts for Dry (CO₂) Reforming of Methane

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• 作者：Prof. Jun Ni ; Dr. Jia Zhao ; Dr. Luwei Chen ; Prof. Jianyi Lin and Prof. Sibudjing Kawi
• 刊名：ChemCatChem
• 出版年：2016
• 出版时间：December 19, 2016
• 年：2016
• 卷：8
• 期：24
• 页码：3732-3739
• 全文大小：1523K
• ISSN：1867-3899

文摘

Strong Lewis acid species [Al–F] were synthesized on a series of Al₂O₃-supported Ni catalysts modified with (0, 1, 5, and 10 wt.%) of KF to investigate the electronic and anchoring effect of [Al–F] on Ni catalysts in terms of catalytic activity, stability, and carbon resistance during dry reforming of methane (DRM) reaction. With the aids of XRD analysis, X-ray photoelectron spectroscopy, H₂ temperature-programmed reduction, and in situ diffuse reflectance infrared Fourier transform spectroscopy analyses, it was found that the activity and stability of KF-modified catalysts in the reaction was directly associated to the presence of [Al–F] sites. The [Al–F] Lewis acid sites not only stabilized the metal Ni from high-temperature sintering after reaction of 200 h through an enhanced metal–support interaction, but also reduced the electron density of Ni metal, which alleviated the fast decomposition of CH₄ and subsequent carbon deposition on catalysts. Balancing the rates for CH₄ dissociation and carbon removal would be promising steps in the design of active and stable Ni-based catalysts.