The Effect of Ni Precursor Salts on Diatomite Supported Ni-Mg Catalysts in Methanation of CO₂

Abstract:

This study is aimed to investigate the effect of Ni precursor salts on the properties (textural, phase-structural, reducibility, and basicity), and catalytic performance of diatomite supported Ni-Mg catalyst in methanation of CO₂. The NiMg/D-X catalysts derived from various nickel salts (X = S-sulfamate, N-nitrate or A-acetate) were synthesized by the precipitation-deposition (PD) method. The catalysts were characterized by N₂-physisorption, XRD, TPR-H₂, and TPD-CO₂ techniques. The different catalytic activity (conversion) and selectivity, observed in CO₂ methanation carried out under relatively mild conditions (atmospheric pressure; temperatures: 250-450 °C) are related and explained by the difference in textural properties, metallic Ni-crystallite size, reducibility, and basicity of studied catalysts. The results showed that catalyst derived from Ni-nitrate salt (NiMg/D-N) is more suitable for the preparation of efficient catalyst for CO₂ methanation than its counterparts derived from sulfamate (NiMg/D-S) or acetate (NiMg/D-A) nickel salt. The NiMg/D-N catalyst showed the highest specific surface area and total basicity, and the best catalytic performance with CO₂ conversion of 63.3 % and CH₄ selectivity of 80.9 % at 450 °C.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1417-1422
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1417
• Online since: January 2021
• Authors: Chao Sun*, Jugoslav Krstic, Vojkan Radonjic, Miroslav Stankovic, Patrick da Costa
• Keywords: CO₂ Methanation, Diatomite Support, Ni Precursor Salt, Ni-Mg Catalyst

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