Scalable Integration of Highly Uniform MnxCo3−xO4 Nanosheet Array onto Ceramic Monolithic Substrates for Low‐Temperature Propane Oxidation

Abstract The redox reaction between KMnO 4 and Co(NO 3 ) 2 was designed and readily utilized for the scalable integration of spinel Mn x Co 3− x O 4 nanosheet arrays in three‐dimensional ceramic honeycombs by controlling the reaction temperature. The Co 2+ can reduce MnO 4 − to form Mn–Co spinel oxide nanosheet arrays uniformly on the channel surface of cordierite honeycomb. The novel platinum group metal free oxide nanosheet array integrated ceramic honeycomb monolith shows good low‐temperature catalytic activity for propane oxidation, with the 50 % conversion temperature achieved at 310 °C, which is a much lower temperature than that over the wash‐coated commercial Pt/Al 2 O 3 . These integrated Mn–Co composite oxide nanoarrays may hold great promise for the construction of advanced monolithic catalyst for high‐performance and low‐cost emission control.