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Title: FeOx-VOx-WOx-MnOx-CeOx/TiO2 as a catalyst for selective catalytic reduction of NOx with NH3 and the role of iron
Authors: Yu, Su
Guojun, Dong
Yuan, Zhao
Yufeng, Zhang
Yajie, Wang
Keywords: Catalysts;Oxides;Nitrogen oxides;Reduction;Iron;Vanadium;Tungsten;Manganese;Cerium;Titanium
Issue Date: 11-Jun-2015
Publisher: NISCAIR-CSIR, India
Abstract: The preparation of FeOx-VOx-WOx-MnOx-CeOx/TiO2 catalyst by the ultrasound-substep-wet impregnation method for removing NOx from diesel engine exhausts has been demonstrated along with the excellent low-temperature selective catalytic reduction activity over a broad temperature window of 150–300 °C. The specific surface area, catalyst structure, composition and SCR reactivity tests of NO with NH3 at low temperatures have been investigated by nitrogen adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, H2 temperature programmed reduction, NH3 temperature programmed desorption and in situ DRIFTS measurements. The results show that the excellent activity is due to the well-dispersed active components, the moderate ratio of V4+/V5+ and (Mn2++Mn3+)/Mn4+, the excellent redox property and the abundant acid sites. Iron plays the important role of inhibiting the agglomeration of metal oxide during the catalyst sintering and converting V and Mn to their higher oxidation states.
Page(s): 744-751
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.54A(06) [June 2015]

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