Figure 2.

(a) H₂-TPR of the as-prepared Ni/MCM-out, Ni/MCM-both, and Ni/MCM-in, and the corresponding TEM images for out (α), window-like (β), and in (γ) Ni sites; (b) H₂ consumption (by TPR) for the as-prepared catalysts (-a) and the H₂ plasma-treated catalysts (-p) (at a specific energy input, SEI, of 24 kJ/L, SEI = plasma discharge power over gas flow rate); and (c) schematics of the supported Ni catalysts on MCM-41 (top) and shielding effect of mesoporous MCM-41 on Ni species within its mesopores in an H₂ plasma discharge.