The effects of Mn loading on the structure and ozone decomposition activity of MnOx supported on activated carbon

doi:10.1016/S1872-2067(12)60756-6

Abstract

Abstract:

Manganese oxide catalysts supported on activated carbon (AC, MnO_x/AC) for ozone decomposition were prepared by in situ reduction of the permanganate. The morphology, oxidation state, and crystal phase of the supported manganese oxide were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, electron spin resonance, Raman spectroscopy, and temperature-programmed reduction. The supported MnO_x layer was distributed on the surface of AC with a morphology that changed from a porous lichen-like structure to stacked nanospheres, and the thickness of the MnO_x layer increased from 180 nm to 710 nm when the Mn loading was increased from 0.44% to 11%. The crystal phase changed from poorly crystalline β-MnOOH to δ-MnO₂ with the oxidation state of Mn increasing from +2.9-+3.1 to +3.7-+3.8. The activity for the decomposition of low concentration ozone at room temperature was related to the morphology and loading of the supported MnO_x. The 1.1% MnO_x/AC showed the best performance, which was due to its porous lichen-like structure and relatively high Mn loading, while 11% MnO_x/AC with the thickest MnO_x layer had the lowest activity owning to its compact morphology.

Key words: Manganese oxide, Ozone decomposition, Activated carbon, Indoor air, Nanomaterial

Mingxiao Wang, Pengyi Zhang, Jinge Li, Chuanjia Jiang. The effects of Mn loading on the structure and ozone decomposition activity of MnO_x supported on activated carbon[J]. Chinese Journal of Catalysis, 2014, 35(3): 335-341.

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https://www.cjcatal.com/EN/Y2014/V35/I3/335

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The effects of Mn loading on the structure and ozone decomposition activity of MnO_x supported on activated carbon

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