Precise regulation of acid pretreatment for red mud SCR catalyst: Targeting on optimizing the acidity and reducibility

* The optimum SCR activity was realized by tuning the acid pretreatment. * Optimized catalysts showed NO x conversion above 90%. * The NH 3 and NO adsorption capacity of Al-O 3-Fe is stronger than Fe-O 3-Fe. * The formation of almandine consumes Fe 3+ and Al 3+ and weakens their interaction. Red mud...

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