Dual Promotional Effects of TiO2 -Decorated Acid-Treated MnO x Octahedral Molecular Sieve Catalysts for Alkali-Resistant Reduction of NO x

ACS Applied Materials & Interfaces
Lijun YanDengsong Zhang

Abstract

Alkali metals generated during waste incineration in power stations are not conducive to the control of nitrogen oxide (NO x) emission. Hence, improved selective catalytic reduction of NO x with ammonia (NH3-SCR) in the presence of alkali metals is a major issue for practical NO x removal. In this work, we developed a novel TiO2-decorated acid-treated MnO x octahedral molecular sieve (OMS-5(H)@TiO2) catalyst with improved alkali-resistant NO x reduction at low temperature, and the dual promotional effects of OMS-5(H)@TiO2 catalysts were clarified. It was found that the special structure of the acid-treated MnO x octahedral molecular sieve (OMS-5(H)) was responsible for the trapping of alkali metals and high deNO x activity at low temperature. Subsequently, the decoration by TiO2 further improved the redox properties by accelerating the high ratio of Mn4+ and Oα on the surface of the highly active (OMS-5(H)@TiO2) catalyst. Moreover, a thorough mechanism study via in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTs) demonstrated that the acid treatment led to remarkable increment of acid sites, which enabled the catalyst to resist alkali metals in the form of ion exchange. Meanwhile, the decoration...Continue Reading

References

Nov 23, 2010·Environmental Science & Technology·Liang ChenMaofa Ge
Nov 2, 2016·Environmental Science & Technology·Li ZhengXingfu Tang
Sep 13, 2018·Environmental Science & Technology·Jingjing LiuHong He

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Citations

Jan 16, 2021·Advanced Materials·Ruijie YangZhiyuan Zeng
Jun 24, 2020·Environmental Science & Technology·Lijun YanDengsong Zhang
Sep 8, 2021·Environmental Science & Technology·Pan ZhangDengsong Zhang

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