Fig. 3
From: Control of coordinatively unsaturated Zr sites in ZrO2 for efficient C–H bond activation
Catalytic activity for C–H bond breaking. The rate of olefin formation (r(CnH2n)), i.e. C2H4, C2H4, C3H6 and iso-C4H8 from CH4 (black), C2H6 (grey), C3H8 (dark red) and iso-C4H10 (green), respectively, a versus feed alkane over ZrO2 with the highest S(C3H6) in Fig. 1b or b versus the size of ZrO2 crystallites. The rate values obtained over amorphous ZrO2 in b are shown with open symbols. All these tests were performed using a feed containing 40 vol% alkane in N2 at 550 °C for C2H6 (grey bar in a and grey circle in b), C3H8 (dark red bar in a and dark red circles in b), and iso-C4H10 (green bar in a and green circle in b) or at 800 °C for CH4 (black bar in a)
