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(a) Illustration of two pathways to synthesize the Cu–Mn oxide reproduced from ref. [155]; (b) Schematic of the oxidation of toluene on MnxCo3−xO4 reproduced from ref. [158]; (c) The formation schematic of the porous hollow HC-CoInOx nanocube; (d) The proposed reaction mechanism over the CoInOx catalyst reproduced from ref. [150].
