Carbon capture in hydrogen (H₂) production, typically from steam methane reforming (SMR), involves separating CO₂ generated during the process. Methane reacts with steam to produce hydrogen and carbon monoxide, which is converted to additional hydrogen and CO₂ in the water-gas shift reaction. CO₂ is captured using technologies like chemical solvents, physical solvents, membranes, or pressure swing adsorption. The captured CO₂ is then compressed, transported, and stored in geological formations, enabling the production of "blue hydrogen," a low-carbon alternative to traditional methods.