Manganese oxide catalysts with self-modulating K⁺ content and tunable concentration of lattice oxygen and Mn⁴⁺ were synthesized and investigated for HCHO oxidation. The preparation method affects the physicochemical properties and catalytic activity of the catalysts. Herein, the role of K⁺ in enhancing the lattice oxygen mobility of manganese oxide catalysts for enhanced formaldehyde (HCHO) is presented. The presence of K⁺ enhances the redox properties of Mn and promotes catalytic activity by enhancing the mobility of the lattice oxygen and sustaining the availability of surface active oxygen to sustain the reaction. Catalytic activity was observed to improve with increasing K⁺ content and the surface concentration of lattice oxygen and Mn⁴⁺. A drastic reduction in catalytic activity was observed in the acid-treated samples, with low K⁺ concentration. Characterization results indicate that the presence of K⁺ enhances activity and mobility of the lattice oxygen by the weakening the Mn-O bond in manganese oxide and promotes the redox properties of the catalyst. The absence of K⁺ impacted the mobility of the lattice oxygen and the ability of the catalyst to supplement the consumed oxygen species, resulting into reduced catalytic activity and deactivation in the room-temperature (30 °C) activity and stability test.

合成了具有自调节的K ⁺含量和可调的晶格氧和Mn ⁴⁺浓度的锰氧化物催化剂，并研究了HCHO的氧化作用。制备方法影响催化剂的理化性质和催化活性。在此，提出了K ⁺在增强用于增强甲醛（HCHO）的锰氧化物催化剂的晶格氧迁移率中的作用。K ⁺的存在通过增强晶格氧的迁移率并维持表面活性氧的可用性来维持反应而增强了Mn的氧化还原特性并促进了催化活性。观察到催化活性随K ^+的增加而提高氧和Mn ^4+的含量和表面浓度。在低K ⁺浓度的酸处理样品中观察到催化活性急剧降低。表征结果表明，K ⁺的存在通过削弱锰氧化物中的Mn-O键增强了晶格氧的活性和迁移率，并促进了催化剂的氧化还原性能。K ⁺的缺乏影响了晶格氧的迁移率和催化剂补充消耗的氧种类的能力，导致降低的催化活性以及在室温（30°C）的活性和稳定性测试中失活。