Reactive trajectories of *CHO formation for high coverage of surface H (1 ML of H*) from AIMD simulations at 298 K (A) nonadsorbed CO, (B) transition state, and (C) *CHO. The solvent water molecules are hidden for viewing convenience. The colors are Cu in orange, C in gray, H in yellow, and O in red. The reaction barrier is 1.01 eV.