Effects of hierarchical structure on the performance of tin oxide-supported platinum catalyst for room-temperature formaldehyde oxidation

doi:10.1016/S1872-2067(16)62551-2

Abstract

Abstract:

Flower-like tin oxide-supported platinum (Pt/SnO_x) with a hierarchical structure was synthesized by a hydrothermal method and characterized by XRD, SEM, TEM, high resolution TEM, XPS and nitrogen adsorption. The flower-like Pt/SnO_x microspheres of 1 μm in diameter were composed of staggered petal-like nanosheets with a thickness of 20 nm. Pt nanoparticles (NPs) of 2-3 nm were well dispersed on the SnO_x nanosheets. The catalyst was tested in the catalytic oxidation of gaseous formaldehyde (HCHO) at room temperature, and exhibited enhanced activity compared to Pt NPs supported on commercial SnO and ground SnO_x. HCHO removal of 87% was achieved over the hierarchical Pt/SnO_x after 1 h of reaction, which was 1.5 times that over the ground SnO_x-supported Pt (Pt/g-SnO_x), and the high activity was maintained after six recycles, showing the high stability of this catalyst. HCHO decomposition kinetics was modeled as a second order reaction. The reaction rate constant for Pt/SnO_x was 5.6 times higher than Pt/g-SnO_x. The hierarchical pore structure was beneficial for the diffusion and adsorption of HCHO molecules, and the highly dispersed Pt NPs on the SnO_x nanosheets were the active sites for the oxidative decomposition of HCHO into CO₂ and H₂O. This study provided a promising approach for designing efficient catalysts for indoor HCHO removal at ambient temperature.

Key words: Formaldehyde catalytic oxidation, Room temperature, Tin oxide, Platinum, Hierarchical structure, Flower-like

Yuanyuan Duan, Shaoqing Song, Bei Cheng, Jiaguo Yu, Chuanjia Jiang. Effects of hierarchical structure on the performance of tin oxide-supported platinum catalyst for room-temperature formaldehyde oxidation[J]. Chinese Journal of Catalysis, 2017, 38(2): 199-206.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62551-2

https://www.cjcatal.com/EN/Y2017/V38/I2/199

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