## 4 Conclusions  
The use of SGT technology in the preparation of a nickel catalyst based on magnesium-modified cerium oxide Ce\({}_{0.5}\)Mg\({}_{0.5}\)O\({}_{1.5}\) for the combined steam and CO\({}_{2}\) reforming of methane made it possible to obtain nanocrystalline samples characterized by narrow pores (5-10 nm) and an increased thermal stability due to the inhibition of crystallite growth in the support. It was shown by the N\({}_{2}\) adsorption at 77 K and XRD that the dispersion of the active component was controlled by the pore size of the support, the thermal stability of the mesoporous structure of the support, and the method of its functionalization and activation, and increased when cerium acetate was used as a support precursor, with a one-stage synthesis and preliminary activation in vacuum at 300 \({}^{\circ}\)C. The efficiency of catalysts in CSMR increased with an increase in the dispersion of the active component, an increase in the concentration of defective oxygen, and when well-dispersed NiPd nanoparticles and clusters of Ni in the MgO phase were formed. The Ni\({}_{0.194}\)Pd\({}_{0.006}\)Ce\({}_{0.4}\)Mg\({}_{0.4}\)O\({}_{1.4}\) catalyst had the highest dispersion and CDO, ensuring the resistance of the Ni active component to sintering and a stable operation. The yield of the target products was 79% with a conversion of reagents of at least 73% at 750 \({}^{\circ}\)C for 15 h of operation. The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app13084689/s1](https://www.mdpi.com/article/10.3390/app13084689/s1)]([https://www.mdpi.com/article/10.3390/app13084689/s1](https://www.mdpi.com/article/10.3390/app13084689/s1)), Physicochemical methods for studying catalysts; Figure S1: Photograph images of the CSMR (a) experimental equipment and (b) reactor, Figure S2: N\({}_{2}\) adsorption-desorption isotherms (a) and pore size distributions (b) of as-prepared catalysts calcined at 500 \({}^{\circ}\)C. 1-Ni/CeMg-C-S-O; 2-Ni/CeMg-A-S-V; 3-Ni/CeMg-A-S-O; 4-Ni-Pd/CeMg-A-S-V; 5-Ni/CeMg-A-P-O, Figure S3: SEM images Ni/CeMg-C-S-O, Figure S4: X-ray diffraction patterns of the as-prepared catalysts calcined at 500 \({}^{\circ}\)C. 1-Ni/CeMg-C-S-O; 2-Ni/CeMg-A-S-V; 3-Ni/CeMg-A-S-O; 4-Ni-Pd/CeMg-A-S-V; 5-Ni/CeMg-A-P-O, Figure S5: Survey X-ray photoelectron spectra of reduced catalysts. 1-Ni/CeMg-C-S-O; 2-Ni/CeMg-A-S-V; 3-Ni/CeMg-A-S-O; 4-Ni-Pd/CeMg-A-S-V; 5-Ni/CeMg-A-P-O, Figure S6: X-ray photoelectron spectra of Ni2p over reduced catalysts. 1-Ni/CeMg-C-S-O; 2-Ni/CeMg-A-S-V; 3-Ni/CeMg-A-S-O; 4-Ni-Pd/CeMg-A-S-V; 5-Ni/CeMg-A-P-O, Figure S7: Temperature dependence of CO\({}_{2}\) and CH\({}_{4}\) conversions and H\({}_{2}\) and CO yields on catalyst Ni/CeMg-C-S-O, Figure S8: CH\({}_{4}\) conversion (a), CO\({}_{2}\) conversion (b), CO yield (c), and H\({}_{2}\)/CO ratio (d) during CSMR at 750 \({}^{\circ}\)C over M/Ce\({}_{0.5}\)Mg\({}_{0.5}\)O\({}_{1.5}\). 1-Ni/CeMg-C-S-O; 2-Ni/CeMg-A-S-V; 3-Ni/CeMg-A-S-O; 4-Ni-Pd/CeMg-A-S-V; 5-Ni/CeMg-A-P-O, Figure S9. Diffraction patterns of colloids stabilized by PVP and calcined at 573 K in vacuum at 10 mbar: Ni0.97 Pd0.03 (1), Ni (2), Pd (3). Conceptualization, L.O. ; methodology, L.O. ; software, I.P. ; validation, L.O. ; formal analysis, L.O. ; investigation, I.P. ; resources L.O. ; data curation, L.O. ; writing--original draft preparation, L.O. ; writing--review and editing, M.K. ; visualization, I.P. ; supervision, Z.I. ; project administration, Z.I. ; funding acquisition, M.K. All authors have read and agreed to the published version of the manuscript. This research was funded by the Ministry of Science and Higher Education of the Russian Federation within the governmental order for the Boreskov Institute of Catalysis (grant number project AAAA-A21-121011490008-3). Not applicable. Data Availability Statement: Data is contained within the article. The authors are grateful to [PERSON], [PERSON], [PERSON] and [PERSON] for their assistance in the study of samples by physicochemical methods and [PERSON] for the catalytic experiments.