Channel surfaces of 3-D cordierite honeycomb were readily etched with basic solution and became rougher with formation of a uniform layer of silicate nanosheet array structures. The reaction between KMnO₄ and Co(NO₃)₂ was applied for integrating Mn-Co-O nanosheet array on both blank and modified cordierite honeycombs. The etched cordierite channels can induce the Mn-Co-O arrays with larger unit size, higher density and thickness. Compared to the blank cordierite, the Mn-Co-O array on etched cordierite has much better catalytic performance in oxidation of hydrocarbons, which can be due to its varied features such as more abundant porosity, higher surface area, more Mn⁴⁺, Co³⁺ and adsorbed oxygen species. This study provides an efficient way for tuning the nanostructures of Mn-Co composite oxide nano-array based monolith, further boosting their catalytic activities in combustion of hydrocarbons.

3-D堇青石蜂窝的通道表面很容易用碱性溶液蚀刻，并随着形成均匀的硅酸盐纳米片阵列结构层而变得更粗糙。应用KMnO ₄和Co（NO ₃）₂之间的反应将Mn-Co-O纳米片阵列整合在空白和改性堇青石蜂窝上。蚀刻的堇青石通道可以诱导出具有更大的单元尺寸，更高的密度和厚度的Mn-Co-O阵列。与空白堇青石相比，蚀刻堇青石上的Mn-Co-O阵列在碳氢化合物氧化方面具有更好的催化性能，这可能是由于其具有多种多样的特征，例如孔隙率更大，表面积更大，Mn ⁴⁺，Co更多³⁺和吸附的氧。这项研究提供了一种有效的方法来调节基于Mn-Co复合氧化物纳米阵列的整体结构的纳米结构，从而进一步提高其在碳氢化合物燃烧中的催化活性。