CoO-loaded NiO monolithic catalysts were successfully prepared on cordierite substrates using a simple hydrothermal and impregnation method. The mass transfer of gaseous reactants and products during soot combustion is facilitated by the constructed macroporous voids, thereby enhancing the soot-catalyst contact efficiency. The results demonstrate that the interaction of Ni and Co (Co + Ni ↔ Ni + Co) leads to an increase in the amount of Co cations, resulting in a higher quantity of oxygen vacancies. Besides the surface adsorbed oxygen (O), it demonstrates that the hydroxyl group (-OH) also acts as active oxygen species in soot oxidation. And, the impact of Co loading on the catalysts displays a volcano-type on the performance of soot oxidation. 0.5Co/NiO with the strongest CO-Ni interaction possesses the highest intrinsic activity. As a result, 0.5Co/NiO shows the highest activity with at 382 °C in 600 ppm NO/10 % O/N flow, as well as high stability and water resistance. Moreover, the prepared catalysts can efficiently catalyze NO to NO, which possesses higher reactivity for soot oxidation than O and NO. Consequently, the as-designed Co/NiO monolithic catalysts hold great potential for applications in soot combustion and other non-homogeneous catalytic systems.

中文翻译：

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Co-Ni相互作用对整体堇青石原位生长的xCo/NiO纳米片催化剂烟灰燃烧催化活性的影响

采用简单的水热和浸渍方法在堇青石基底上成功制备了 CoO 负载 NiO 整体式催化剂。构建的大孔空隙促进了烟灰燃烧过程中气态反应物和产物的传质，从而提高了烟灰-催化剂的接触效率。结果表明，Ni 和 Co (Co + Ni ↔ Ni + Co) 的相互作用导致 Co 阳离子数量增加，从而产生更多的氧空位。除了表面吸附的氧（O）外，羟基（-OH）在烟灰氧化中也起到活性氧的作用。并且，Co负载量对催化剂的烟灰氧化性能的影响表现出火山型的影响。 CO-Ni相互作用最强的0.5Co/NiO具有最高的内在活性。因此，0.5Co/NiO 在 382 °C、600 ppm NO/10% O/N 流中表现出最高活性，并且具有高稳定性和耐水性。此外，所制备的催化剂可以有效地将NO催化成NO，其比O和NO具有更高的烟灰氧化反应活性。因此，所设计的Co/NiO整体式催化剂在烟灰燃烧和其他非均相催化系统中具有巨大的应用潜力。