**4. Conclusions**

This paper elucidates the role of La2O3 addition to two different supports (ZrO2 and Al2O3) of Ni-based catalysts for the hydrogen production via CO2 reforming of methane. The 5Ni-10La2O3-ZrO2 catalyst increased the hydrogen yield by 25% in comparison with the pristine 5Ni-ZrO2. Similarly, the 5Ni-15La2O3-Al2O3 catalyst showed improved efficiency of 8% of hydrogen yield. The La2O3 loading influenced differently the ZrO2 and the Al2O3 supports. The study displayed that the modified La2O3-Al2O3 support catalysts gave a higher hydrogen yield than La2O3-ZrO2 supported catalyst. The catalyst characterizations showed that La2O3 addition improved specific surface areas, dispersion, reducibility, metal–support interaction, and surface basic sites which contributed towards the enhanced hydrogen yield. The qualitative and quantitative analysis of carbon formed over the spent catalysts using TEM, TGA, and Raman spectroscopy showed presence of carbon nanotubes. This work provides an insight towards the role of support modification during DRM.

**Supplementary Materials:** The following are available online at https://www.mdpi.com/article/10 .3390/en14092412/s1, Table S1: Textural properties of different catalysts supported Ni catalysts: BET specific surface area (SBET), pore volume (PV), and pore diameter (DP), Table S2: The quantitative analysis of H2 consumption during H2-TPR.

**Author Contributions:** A.A.-F., A.I. and S.K. synthesized the catalysts, carried out all the experiments and characterization tests, and wrote the manuscript. W.K. and M.S. prepared the catalyst and contributed to proofreading of the manuscript. A.A. and A.F. contributed to the analysis of the data and writing—review of the manuscript. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by Deanship of Scientific Research at King Saud University so the authors would like to express their sincere appreciation to the Deanship of Scientific Research at King Saud University for funding this research project (#RG-119).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors would like to express their sincere appreciation to the Deanship of Scientific Research at King Saud University for funding this research project (#RG-119).

**Conflicts of Interest:** The authors declare no conflict of interest.
