Enhanced catalytic decomposition of formaldehyde in low temperature and dry environment over silicate-decorated titania supported sodium-stabilized platinum catalyst

• Published in: Applied catalysis. B, Environmental Environmental, 2020-11, Vol.277, p.119216, Article 119216
• Main Authors: Li, Licheng, Li, Long, Wang, Lei, Zhao, Xuejuan, Hua, Zelin, Chen, Yuanyuan, Li, Xiaobao, Gu, Xiaoli
• Format: Article
• Language: English
• Subjects: Catalysts; Decomposition; Decoration; Dry environment; Environment; Extreme environments; Formaldehyde; Low temperature; Nanoparticles; Nanotechnology; Nanowires; Platinum; Pollutants; Relative humidity; Silica; Silicate; Silicon dioxide; Sodium; Titanium dioxide
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2020.119216

[Display omitted] •Pt/SiOx-TiO2 efficiently decomposes HCHO in low temperature and dry environment.•SiOx-TiO2 is obtained by adding SiO2 in synthesis of titanate and ion-exchange.•Silicate and sodium-stabilized Pt are two structural factors for good performance. Development of the environment-tolerant catalyst can contribute to pollutant treatment in extreme environment. In the present work, precursor of the silicate-decorated titania (SiOx-TiO2) was prepared by incorporating silica into hydrothermal synthesis of TiO2 nanowire (TNT). After loading Pt nanoparticles by impregnation, the as-prepared catalyst (Pt/SiOx-TiO2) possessed 7.2 times and 13.6 times the HCHO decomposition rate of Pt/TNT and conventional Pt/TiO2, respectively, at the temperature of 30 °C and the relative humidity of ∼5 %. Structure-performance relationship analyses showed that the excellent catalytic performance of Pt/SiOx-TiO2 was closely related to the presence of silicate and formation of sodium-stabilized Pt nanoparticles. The heterogeneously decorated silicate in Pt/SiOx-TiO2 had the excellent ability of capturing water from environment and even from HCHO decomposition itself. Consequently, the sodium-stabilized Pt nanoparticles of Pt/SiOx-TiO2 could be maintained in a wet microenvironment to exhibit the excellent HCHO decomposition performance in low temperature and dry environment.