Regulation of precipitants on the synthesis of Mn_xZr_1−xO_y catalysts for room-temperature formaldehyde catalytic oxidation performance

To develop a high-performance catalyst suitable for efficient room-temperature formaldehyde purification, this study focuses on practical application and investigates the effects of precipitant types (K₂CO₃, Na₂CO₃, NaOH, KOH, NH₃·H₂O) and pH in the coprecipitation method on the synthesis of Mn_xZr_1−xO_y catalysts and their room-temperature catalytic oxidation performance. The catalysts were characterized using XRD, BET, and XPS. The results show that by selecting NH₃·H₂O or KOH as the precipitant and controlling pH at 9, the room-temperature formaldehyde oxidation performance of the catalyst is significantly enhanced, maintaining a super-high removal efficiency of over 98% during long-term testing. Furthermore, the raw materials are low-cost, demonstrating promising application prospects. The appropriate choice of precipitant effectively endows the catalyst with key characteristics such as high specific surface area and abundant surface-active oxygen species. This study confirms the feasibility of enhancing catalyst performance through the simple optimization of the precipitant, providing a clear and effective performance-enhancement strategy for developing room-temperature formaldehyde purification catalysts for practical applications.