Fig. 2
From: Subnanometer cobalt oxide clusters as selective low temperature oxidative dehydrogenation catalysts
Performance of alumina-supported Co clusters under oxygen rich conditions (C6H12:O2 = 1:10). a Temperature ramp with gas environment applied. b r (rate of formation) for the major products cyclohexene (m/z = 67) on the Co4/Al2O3 catalyst (blue squares) and Co27/Al2O3 catalyst (blue circles), cyclohexadiene (m/z = 79) on the Co4/Al2O3 catalyst (red squares) and Co27/Al2O3 catalyst (red circles), and benzene (m/z = 78) on Co4/Al2O3 catalyst (black squares) and Co27/Al2O3 catalyst (black circles), and the byproduct CO2 (m/z = 44) on the Co4/Al2O3 catalyst (pink squares) and Co27/Al2O3 catalyst (pink circles). Cyclohexadiene mass is a superposition from 1,3- and 1,4- cyclohexadiene (both isomers have same electron ionization cross section53). c Carbon-based selectivity for the dominant reaction products with Co4/Al2O3 catalyst (blue: cyclohexene, red: cyclohexadiene, black: benzene, pink: CO2), and d Carbon-based selectivity for the dominant reaction products for Co27/Al2O3 catalyst (blue: cyclohexene, red: cyclohexadiene, black: benzene, pink: CO2). The interconnecting lines serve as guide to the eye
