A novel nitrogen-based fuel consisting of a urea and ammonium nitrate aqueous solution (UAN) has been previously suggested as a hydrogen carrier that can undergo efficient combustion into N2, H20 and residual CO2, with minimal NOx emissions. Using CHEMKIN-PRO a new combustion kinetic database is suggested and validated relative to previous experiments in the pressure range of 1-25 MPa. Excellent agreement was found for nitrogen-based species at high pressures and for carbon-based products at all pressures. This confirms the suitability of the new kinetic database for the simulation of high pressure UAN combustion.