Synthesis, Characterization, and Activity Pattern of Ni–Al Hydrotalcite Catalysts in CO2 Methanation

详细信息    查看全文

• 作者：Salvatore Abate ; Katia Barbera ; Emanuele Giglio ; Fabio Deorsola ; Samir Bensaid ; Siglinda Perathoner ; Raffaele Pirone ; Gabriele Centi
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：55
• 期：30
• 页码：8299-8308
• 全文大小：619K
• 年卷期：0
• ISSN：1520-5045

文摘

Two nickel–aluminum hydrotalcite samples (HTLCs) were prepared by a coprecipitation method at different pH values and investigated as catalysts for the hydrogenation of carbon dioxide. The newly synthesized samples have been compared with a reference alumina supported nickel-based commercial catalyst, with equal nickel content. The as-prepared and commercial samples were characterized by BET analysis, atomic adsorption spectroscopy (AAS), X-ray diffraction (XRD), and temperature-programmed techniques (H₂-TPR and CO-TPD). Catalytic activity of the analyzed samples was investigated toward hydrogenation of CO₂ at atmospheric pressure by varying reaction temperature between 250 and 400 °C. The maximum CO₂-to-CH₄ conversion value achieved by hydrotalcyte was ≈86% at 300 °C. The superior performance of HTLCs has been put in relationship with the major catalysts reducibility nature and with the higher metal surface area and metal dispersion. The stability of the HTLCs was investigated through long-term tests, resulting in good stability in the reported reaction conditions.