FIGURE 7 Recycling of Ni@N-C SAC in the catalytic hydrogenolysis of PPE and characterization of the used catalysts: (a) Recycling numbers (reaction conditions: 100 mg PPE, 20 mg catalyst, 20 ml isopropanol, stirring at 400 rpm, 200 ÂșC, 5 h). (b) XRD pattern. (c) XPS Ni 2p. (d, e) TEM images. (f) Aberration-corrected HAADF-STEM image.