Preparation of flexible Pt/TiO2/γ-Al2O3 nanofiber paper for room-temperature HCHO oxidation and particulate filtration

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 427; p. 130951
• Main Authors: Zhu, Silong, Zheng, Jianfei, Xin, Sitian, Nie, Longhui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2022
• Subjects: Electrospinning; Filtration performance; Flexible Pt/TiO2/γ-Al2O3 nanofiber; HCHO oxidation; Electrospinning; Filtration performance; Flexible Pt/TiO2/γ-Al2O3 nanofiber; HCHO oxidation
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.130951

[Display omitted] •A bifunctional flexible Pt/TiO2-γ-Al2O3 nanofiber paper was successfully prepared.•The PTA sample can efficiently decompose HCHO to CO2 and H2O at room temperature.•PTA1 exhibited better catalytic activity and stability.•The surface coating of TiO2 in PTA catalyst plays an important role for its performance.•The PTA sample also exhibits good filtration performance for fine particles. A flexible Pt/TiO2/γ-Al2O3 nanfiber paper (PTA) was successfully prepared by an electrospinning-coating-NaBH4 reduction method. The catalytic performance for formaldehyde (HCHO) oxidation over PTA with different Pt contents was investigated at room temperature. The results show that PTA exhibits higher catalytic activity and stability than Pt/γ-Al2O3. The TiO2 coating can promote the transformation of intermediate species and the desorption of CO2. The PTA1 with 1 wt% Pt shows the best catalytic activity and good stability. In the view of activity and cost, 0.5 wt% Pt is the optimal Pt content. The TiO2 coating not only plays an important role in improving the activity and stability of PTA, but also acts as a protective shell of γ-Al2O3 fiber, which greatly reduces the risk of alkali etching during preparation and maintains the good flexibility of PTA. The dioxymethylene (DOM), formate/carbonate species, CO are the intermediate species in HCHO oxidation over PTA. In addition, PTA exhibits good filtration performance for fine particles as well as good fluid permeability. Because of the high efficiency and flexibility of PTA composite catalytic material for HCHO oxidation with good filtration performance for fine particles, it will be a promising candidate in air purification.