Ammonia is found more reactive at higher temperature, Fig. shows the decomposition at 1300 °C, 10 mbar and 1:10 ammonia to carrier ratio. At these conditions, decomposition starts already at 100 ms in N2 and Ar carriers. After 2-4 s half of the initial amount of ammonia has decomposed and over 95 % has decomposed after 100 s. After a few seconds, the gas will be dominated by the major decomposition products, N2 and H2, and the carriers. NH3 shows much lower reactivity in H2 containing carriers compared to N2 and Ar also at 1300 °C with significant decomposition will only after around 10 s. NH3 will reach 50 % decomposition in pure H2 and 75 % decomposition in H2/N2 mixture at 100 s. Similar to the 1000 °C simulation, at 1300 °C the major decomposition intermediates for decomposition in N2 or Ar are NH2 and N2H2. Their maximum partial pressures are higher and reached quicker at 1300 °C compared to 1000 °C. The NH2 concentration shows a plateau at its maximum pressure before it starts to deplete at around 20 s. In pure H2 and in H2/N2 mixture the major decomposition product is NH2, but its partial pressure is significantly lower than in N2 and Ar and it takes longer time for the partial pressure to be high enough to appear in the plot, around 0.1 s, which is significantly later than for N2 and Ar.