Fig. 1
From: Control of coordinatively unsaturated Zr sites in ZrO2 for efficient C–H bond activation
Catalytic property in PDH. a The rate of propene formation (r(C3H6)) versus the size of crystallites of differently prepared ZrO2 (Supplementary Table 1). b An integral selectivity to propene (S(C3H6)) calculated from the number of C3H8 moles converted and C3H6 moles formed within 1 h on C3H8 stream (Supplementary Fig. 4 and Supplementary Equation 2) over ZrO2 with different crystallite sizes. c r(C3H6) over ZrO2 after reduction in H2 or CO. d The effect of catalyst treatment by CO or H2 on the ratio of yields of propene to cracking products (Y(C3H6)/Y(C1–C2)). ZrO2 with the highest S(C3H6) in b was used in c and d. All these tests were performed at 550 °C using a feed containing 40 vol% C3H8 in N2
