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A series of Ni  x  Mn bimixed metal oxides (Ni  x  Mn-LDO) were prepared via calcining Ni  x  Mn layered double hydroxides (Ni  x  Mn-LDHs) precursors at 400 °C and applied as catalysts in the selective catalytic reduction (SCR) of NO  x  with NH 3 . The DeNO  x  performance of catalysts was optimized by adjusting the Ni/Mn molar ratios of Ni  x  Mn-LDO precursors, in which Ni 5 Mn-LDO exhibited above 90% NO  x  conversion and N 2 selectivity at a temperature zone of 180-360 °C. Besides, Ni 5 Mn-LDO possessed considerable SO 2 &amp; H 2 O resistance and outstanding stability. Multiple characterization techniques were used to analyze the physicochemical properties of the catalysts. The analysis results indicated that all catalysts had the same active species Ni 6 MnO 8 , while their particle sizes showed significant differences. Notably, the uniform distribution of active species particles in the Ni 5 Mn-LDO catalyst provided the rich surface acidity and suitable redox ability which were the primary causes for its desirable DeNO  x  property.

rsc advances

Tunable preparation of highly dispersed NixMn-LDO catalysts derived from NixMn-LDHs precursors and application in low-temperature NH3-SCR reactions