Cobalt–Nickel Catalysts Supported on Opoka and Diatomite for CO2 Hydrogenation
Jussupkaliyeva R.I. Pugacheva E.V. Bystrova I.M. Pomogailo S.I. Khomenko N.Y. Boyarchenko O.D. Borshch V.N.
December 2025Pleiades Publishing
International Journal of Self-Propagating High-Temperature Synthesis
2025#34Issue 4270 - 279 pp.
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.
CO2 hydrogenation , diatomite , low-temperature combustion , methane , opoka , supported CoNi catalysts
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Zhangir Khan West Kazakhstan Agrarian Technical University, Uralsk, 090009, Kazakhstan
Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, 142432, Russian Federation
All-Russian Institute for Scientific and Technical Information, Russian Academy of Sciences, Moscow, 125190, Russian Federation
Zhangir Khan West Kazakhstan Agrarian Technical University
Merzhanov Institute of Structural Macrokinetics and Materials Science
All-Russian Institute for Scientific and Technical Information
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