Fig. 4: Thermodynamic and kinetic calculation results for urea synthesis. | Nature Communications

Fig. 4: Thermodynamic and kinetic calculation results for urea synthesis.

From: Identifying and tailoring C–N coupling site for efficient urea synthesis over diatomic Fe–Ni catalyst

Fig. 4

a Free energy diagram of urea production. b The reaction pathway of first C–N coupling for *NHCO formation and c second C–N coupling for *NHCONO formation. The structures of the initial, transition and final states along with the *NHCO and *NHCONO formation are also presented. The purple, indigo, blue, red, and gray balls represent Fe, Ni, N, O, and C atoms, respectively.

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