Highly porous CuO/MnO2 catalyst prepared by gas release-assisted technology and its enhancement of formaldehyde removal efficiency

• Published in: Research on chemical intermediates Vol. 48; no. 5; pp. 1971 - 1988
• Main Authors: Wang, Shu, Qiu, Lijuan, Li, Changjiang, Zheng, Yuchuan, Pan, Le
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2022; Springer Nature B.V
• Subjects: Ammonia; Catalysis; Catalysts; Chemical synthesis; Chemistry; Chemistry and Materials Science; Copper; Copper oxides; Decay rate; Formaldehyde; Humidity; Inorganic Chemistry; Manganese dioxide; Physical Chemistry; Porous materials; Relative humidity; Room temperature; Formaldehyde oxidation; Ammonia; Gas release assisted; Copper oxide; Manganese oxide
• ISSN: 0922-6168; 1568-5675
• DOI: 10.1007/s11164-022-04696-8

A porous CuO/MnO 2 catalyst was synthesized by a gas release-assisted method. Due to the participation of gases (H 2 O, NH 3 , CO 2 ) released from ammonia and carbonate, the porous CuO/MnO 2 with high surface and abundant aperture structure was obtained. Benefitting from the large specific surface area, high TOF and the proper atomic ratio of Cu and Mn on the catalyst surface, 0.20CuO/MnO 2 (where 0.20 acted as the molar ratio of copper to manganese species) has the best catalytic performance, which can completely remove formaldehyde at 130 °C with 400 ppm HCHO concentration. Under 10 times higher than the upper limit of indoor formaldehyde (World Health Organization), the formaldehyde conversion of the porous CuO/MnO 2 catalyst remains above 97% at 25 °C (the relative humidity RH ≤ 50%), which suggest it can almost completely remove the low concentration formaldehyde. The catalytic performance decays slowly within 6 h. Therefore, the porous CuO/MnO 2 catalyst shows excellent low-concentration formaldehyde removal effect, long-term catalytic stability, suggesting it has a great potential for indoor formaldehyde removal under 0–50% relative humidity. This result not only provides an inexpensive, simple and efficient porous CuO/MnO 2 material for formaldehyde removal indoor at room temperature but also provides a new strategy for the preparation of other porous material.