Abstract: Sol-gel-prepared Ni-Mg-O oxide systems are considered promising catalysts for dry reforming of methane. The addition of CeO2 to the catalyst composition enhances its performance under reaction conditions. Another factor affecting the activity and thermal stability of such catalysts is the strength of the NiO-MgO interaction. In this research, the effects of calcination temperature on the textural characteristics, strength of NiO-MgO interaction, and catalytic performance of Ni-Mg-O and Ni-Ce-Mg-O in the dry reforming of methane are studied. As found, the sintering resistance of MgO is noticeably enhanced in the presence of CeO2. Moreover, CeO2 hinders the formation of NixMg1-xO solid solutions, thus improving the reducibility of Ni. The strength of the NiO-MgO interaction increased with the temperature for both the Ni-Mg-O and Ni-Ce-Mg-O samples, while the NiO-CeO2 interaction was optimal after calcination at 600 °C. The increased stability of the CeO2-containing catalyst under dry reforming conditions is due to the suppressed formation of carbon deposits. Among the Ce-containing catalysts, the samples calcined at 500 and 600 °С exhibited an optimal catalytic performance. Thus, the former demonstrated a higher conversion of the reagents, while the latter showed a higher stability. At a higher calcination temperature (700 °С), the weaker NiO-CeO2 and NiO-MgO interactions worsened both the stability and catalytic activity. The Ni-Ce-Mg-O sample calcined at 600 °C was tested at 30 L/(g·h) and 750 °C for 140 h and demonstrated the values of CH4 and CO2 conversions of 89.6 and 90.2%, respectively. As revealed by high-resolution transmission electron microscopy, regardless of calcination temperature, reduction of CeO2 in hydrogen at 750 °C has led to the formation of highly dispersed clusters along with layers at the intra-crystallite boundaries. The interaction of these CeO2 species with Ni is supposed to be responsible for the enhanced catalytic performance.

Cite: Veselov G.B. , Ilyina E.V. , Stoyanovskii V.O. , Vedyagin A.A.
Dry Reforming of Methane over Ni-Mg-O and Ni-Ce-Mg-O Oxide Catalysts: Effect of the Calcination Temperature on the Catalytic Performance and Thermal Stability
Applied Catalysis A: General. 2026. V.713. 120801 :1-18. DOI: 10.1016/j.apcata.2026.120801 OpenAlex

Dates:

Submitted:	Sep 25, 2025
Accepted:	Jan 21, 2026
Published online:	Jan 22, 2026
Published print:	Mar 5, 2026

Identifiers:

OpenAlex:

W7125424364

Citing: Пока нет цитирований

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