A methanol production process combines tri-reforming of methane (TRM) with water electrolysis to utilize CO₂. The TRM reactor uses a Ni/Al₂O₃ catalyst, and the methanol synthesis reactor uses a Cu/ZnO/Al₂O₃ catalyst. The goal is to achieve a methanol production rate of 2095 tons per day, with a gas hourly space velocity (GHSV) of 3000 h⁻¹ in the TRM reactor. Calculating the required catalyst quantities involves considering the reaction conditions and catalyst efficiencies.