Hydrogenation of CO2 is an important and useful reaction, both from the perspective of CO2 mitigation and the added value to the products such as formaldehyde and methanol. In this study, CO2 hydrogenation reaction was carried out using intermetallic NiGaAg catalysts supported on mesoporous carbon (MC). Catalysts were synthesized using the impregnation method with variations in Ag loading. Based on the XRD characterization, the formation of intermetallic Ni5Ga3 and Ag nanoparticles on MC have been confirmed. SEM-mapping images show even distribution of all metals on MC surface. Surface area analysis shows the pore diameters of NiGa/MC and NiGaAg/MC catalysts are 5.5 and 6.0 nm, respectively, confirming the mesoporous properties. The activity of the catalyst in the hydrogenation reaction of CO2 was carried out in a fixed-bed reactor. Both NiGa/MC and Ag-modified NiGa/MC catalysts gave methanol and formaldehyde as CO2 hydrogenation products. The addition of Ag to the NiGa/MC catalyst increases the CO2 conversion as well as the yielded products. Maximum formaldehyde and methanol yields of 1435.14 and 12.70 µmol/(gcat.h), respectively, were obtained over Ni5Ga3Ag0.1/MC catalyst with a CO2:H2 ratio of 1:7 at 170 °C. © 2025 The Author(s)