Photocatalytic removal of nitric oxide by multi-walled carbon nanotubes-supported TiO2

doi:10.1016/S1872-2067(12)60705-0

Abstract

Abstract:

Multi-walled carbon nanotubes (MWCNTs) coated with TiO₂ were prepared by a sol-gel method and characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and UV-Vis diffuse reflectance spectroscopy. It was found that MWCNTs/TiO₂ consisted mainly of anatase phase. The introduction of MWCNTs inhibited TiO₂ grain growth. Moreover, the adsorption edge of MWCNTs/TiO₂ shifted toward long-wavelength region compared with bare TiO₂. The photocatalytic ability of MWCNTs/TiO₂ for NO removal was experimentally investigated in a fixed-bed reactor. The results showed that a lower initial NO concentration was conducive to NO removal. A negative effect of SO₂ on denitration was observed. In contrast, O₂ and H₂O played a promotional role in the photocatalytic denitration. At optimal conditions (73 mg/m³ NO, 8% O₂, 5% H₂O), NO removal efficiency of 46% was achieved. In addition, the reaction mechanism of denitration was proposed.

Key words: Multi-walled carbon nanotube, Titanium dioxide, Photocatalysis, Denitration, Flue gas

Hao Liu, Hairu Zhang, Hongmin Yang. Photocatalytic removal of nitric oxide by multi-walled carbon nanotubes-supported TiO₂[J]. Chinese Journal of Catalysis, 2014, 35(1): 66-77.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(12)60705-0

https://www.cjcatal.com/EN/Y2014/V35/I1/66

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Photocatalytic removal of nitric oxide by multi-walled carbon nanotubes-supported TiO₂

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