STEM Images characterizing the MgO-supported Ir(C2H4)2 with various Ir loadings and the species formed by treatment in flowing H2 at 1 bar and 573 K. The initial Ir(C2H4)2/MgO samples contained the following loadings of Ir (wt %): A, 1.0; B, 0.1; C, 0.05; D, 0.01. Samples after treatment in H2 contained Ir in the following loadings (wt %): E, 1.0; F, 0.1; G, 0.05; H, 0.01.

ACS Catal. 2018, 8, 3489−3498