Fig. 1: Evidence for olefins accelerating alkane conversion.

a The conversion of propane in the tandem reaction system at 500 °C. Ftotal = 40 mL min−1, C2H6:C3H8:O2:N2 = 8:2.5:8:21.5. b Alkane conversion in different “Single-alkane” and “alkane-olefin” feeding modes. The total flow velocity of 40 mL min−1 with O2 flow velocity of 8 mL min−1 was employed in all the catalytic tests.