Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Achieving complete mineralization of carcinogenic formaldehyde (FA) using less noble metal at room temperature (RT) is of significant interest for effective indoor air quality management. To maximize atomic utilization, single atom catalysts (SACs) have been recently proposed, however metals dispersed to the single atom limit are less durable in redox environments. In this regard, a highly-dispersed Pt ensemble (Ptn) on titanium dioxide (TiO2) was newly synthesized for the FA oxidation and achieved 100% FA mineralization at RT (steady-state reaction rate (r) of 245 mmol g-1 h-1). In contrast, Pt SACs (Pt1/TiO2) and a reference Pt nanoparticle catalyst (PtNP/TiO2) displayed much lower r-values (155 and 166 mmol g-1 h-1, respectively). The FA removal performance of the PtNP catalyst was consistent with Ptn(0.5%)/TiO2 only when the Pt loading of the former was raised to 2 wt.%, which implies the use of Pt can be reduced by one-fourth by dispersing into the sub-nano scale. Ensembled Pt sites facilitate the dissociation of formaldehyde and oxygen and allow a proximate reaction between adsorbed –CHO group and O atom. In contrast, Pt1 is a single site that prevents proximate reaction and is vulnerable for surface poisoning. The Ptn/TiO2 catalyst with the fully-exposed and robust nature of Pt sites can provide insights beyond single-atom catalysts.
This work was supported by “Particulate Matter Management Specialized Graduate Program” through the Korea Environmental Industry & Technology(KEITI) funded by the Ministry of Environment(MOE).
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