reduction of n2o

[Joris Strassburg]

good day
i want to investigate how well n2o is degraded in a combustion exhaust gas. the reaction in a plugflow reactor gives me meaningful results. But if i look at the equilibrium composition, all n2o is degraded even under atmospheric conditions
i have tried to break down the equilibrium calculation as far as possible:

p = 1e5 # [Pa]
T = 300 # [K]
T_norm = 273 #[K]
x0_n2o = 10000e-6 # N2O in Air [mol/mol]

mix = ct.Solution("gri30.yaml")
mix.X = {"N2": 0.79*(1-x0_n2o), "O2": 0.11*(1-x0_n2o), "CO2":0.1*(1-x0_n2o), "N2O":x0_n2o}
mix.TP = T,ct.one_atm
mix.equilibrate("TP")
print(f "N2O ppm: {mix.X[mix.species_index('N2O')]*1e6:.6f}")
print(f "NO2 ppm: {mix.X[mix.species_index('NO2')]*1e6:.6f}")
print(f "NO ppm: {mix.X[mix.species_index('N2O')]*1e6:.6f}")
print(f "N2 mole fraction: {mix.X[mix.species_index('N2')]}")
print(f "O2 mole fraction: {mix.X[mix.species_index('O2')]}")

is the gri30 mechanism not suitable for such low temperatures?

thx a lot and greetings

joris