La-doped Pt/TiO2 as an efficient catalyst for room temperature oxidation of low concentration HCHO

doi:10.1016/S1872-2067(16)62532-9

Abstract

Abstract:

Catalytic oxidation of formaldehyde (HCHO) is the most efficient way to purify indoor air of HCHO pollutant. This work investigated rare earth La-doped Pt/TiO₂ for low concentration HCHO oxida-tion at room temperature. La-doped Pt/TiO₂ had a dramatically promoted catalytic performance for HCHO oxidation. The reasons for the La promotion effect were investigated by N₂ adsorption, X-ray diffraction, CO chemisorption, X-ray photoelectron spectroscopy, transmission electron microscopy (TEM) and high-angle annular dark field scanning TEM. The Pt nanoparticle size was reduced to 1.7 nm from 2.2 nm after modification by La, which led to higher Pt dispersion, more exposed active sites and enhanced metal-support interaction. Thus a superior activity for indoor low concentration HCHO oxidation was obtained. Moreover, the La-doped TiO₂ can be wash-coated on a cordierite monolith so that very low amounts of Pt (0.01 wt%) can be used. The catalyst was evaluated in a simulated indoor HCHO elimination environment and displayed high purifying efficiency and stabil-ity. It can be potentially used as a commercial catalyst for indoor HCHO elimination.

Key words: Low-concentration formaldehyde, Room-temperature oxidation, Rare earth, Lanthanum doping, Platinum, Titania, Monolithic catalyst

Honggen Peng, Jiawei Ying, Jingyan Zhang, Xianhua Zhang, Cheng Peng, Cheng Rao, Wenming Liu, Ning Zhang, Xiang Wang. La-doped Pt/TiO₂ as an efficient catalyst for room temperature oxidation of low concentration HCHO[J]. Chinese Journal of Catalysis, 2017, 38(1): 39-47.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62532-9

https://www.cjcatal.com/EN/Y2017/V38/I1/39

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La-doped Pt/TiO₂ as an efficient catalyst for room temperature oxidation of low concentration HCHO

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