Cobalt–Nickel Catalysts Supported on Opoka and Diatomite for CO2 Hydrogenation

Rosa I. Jussupkaliyeva, Elena V. Pugacheva, I. M. Bystrova, S. I. Pomogailo, Natalia Yu. Khomenko, О. D. Boyarchenko, Vyacheslav N. Borshch

2025

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DOI 10.3103/s1061386225700268

Data confidence 70 medium

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Abstract

Abstract 5 wt % Co–5 wt % Ni catalysts supported on natural opoka and diatomite silica minerals from the Republic of Kazakhstan were prepared via low-temperature combustion and characterized using XRD, SEM/EDS, and BET analyses. The supports primarily comprised various SiO2 modifications, with opoka also containing sodium, magnesium, and iron silicate and aluminosilicate impurities. Diatomite-supported catalysts exhibited specific surface areas ranging from 60.0 to 71.5 m2/g, while for opoka-supported catalysts, it ranged from 28.6 to 62.8 m2/g. During CO2 hydrogenation to methane, the highest conversion (50.9% at 450°C) was achieved with a catalyst supported on untreated diatomite. However, the highest methane selectivity (90.1% at 450°C) was observed for a catalyst supported on opoka calcined at 500°C.