Tailoring the pore structure is a straightforward and effective strategy to regulate the catalytic activity of catalysts in heterogeneous catalysis reactions but remain a challenge. Herein, we present a low-cost, facile, and large-scale mechanochemical nanocasting strategy between cerium salt and manganese salt that enables solvent-free and rapid synthesis of porous CeMnO x oxide with a high specific surface area, rich chemisorbed oxygen species, Mn4+, and acidity, as well as improved reducibility. Moreover, this kind of catalyst shows exceptionally high low-temperature activity for the selective catalytic reduction of NO x with ammonia (NH3-SCR). It achieves almost 100% NO x conversion at 150 °C, which is much lower than that of its bulk CeMnO x counterpart constructed by the sol–gel method. It is expected that this technology may open up new opportunities for fabricating a number of advanced porous materials with exceptional catalytic activity for the environmental catalysis field.

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