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Powder XRD patterns of (a) Fe/Al‐SBA‐15 and (b) Co/Al‐SBA‐15 for different metal loading of Fe and Co, respectively. TEM images of (c) 1 wt.% Fe/Al‐SBA‐15 and (d) 0.5 wt.% Co/Al‐SBA‐15. Adapted with permission from ref. [97], Copyright 2011 Wiley‐VCH; and from ref. [98], Copyright 2018 by Elsevier Inc.
