Journal ArticleDOI
Improvement of catalytic activity over Mn-modified CeZrOx catalysts for the selective catalytic reduction of NO with NH3
Wenbo Sun,Xinyong Li,Xinyong Li,Jincheng Mu,Shiying Fan,Zhifan Yin,Xinyang Wang,Meichun Qin,Moses O. Tadé,Shaomin Liu +9 more
- Vol. 531, pp 91-97
TLDR
Characterization of the catalyst using BET, XRD, XPS, H2-TPR, and in-situ FTIR proved that the improved SCR activity may be attributed to the large surface area, great reduction ability and increased amount of surface adsorbed oxygen afforded by the introduction of manganese.Abstract:
A series of MnCeZrOx mixed oxide catalysts were facilely synthesized using the impregnation-NH3·H2O coprecipitation method and tested for selective catalytic reduction (SCR) of NO with NH3. Doping manganese significantly improved the catalytic activity and the best performing SCR catalyst, Mn0.25Ce0.5Zr0.25Ox, was shown to achieve NO conversion > 80% in the temperature range (60–350 °C), with the denitration effect up to 50% at room temperature (conditions: [NO] = [NH3] = 500 ppm, [O2] = 5 vol%, He as balance, flow rate = 100 mL/min, GHSV = 40, 000 h−1). Characterization of the catalyst using BET, XRD, XPS, H2-TPR, and in-situ FTIR proved that the improved SCR activity may be attributed to the large surface area, great reduction ability and increased amount of surface adsorbed oxygen afforded by the introduction of manganese. The SCR reaction mechanisms were also investigated by analyzing in-situ FTIR spectra and the SCR reaction pathway over the Mn0.25Ce0.5Zr0.25Ox catalyst was shown to mostly follow the E-R mechanism.read more
Citations
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Journal ArticleDOI
Preferred enhancement of fast-SCR by Mn/CeSiOx catalyst: Study on Ce/Si promotion and shape dependence
TL;DR: In this article, a series of Mn/CeSiOx catalysts were synthesized to investigate the Ce/Si ratios and morphology effect of the Mn/SiOx support for selective catalytic reduction (SCR) of NO with NH3 at low temperature.
Journal ArticleDOI
An in-situ DRIFTs study of Mn doped FeVO4 catalyst by one-pot synthesis for low-temperature NH3-SCR
TL;DR: In this paper, the influence of Mn doping on FeVO4 in the selective catalytic reduction of NOx with NH3 (NH3-SCR) reaction was in-depth studied.
Journal ArticleDOI
An in-situ DRIFTs study of Mn doped FeVO4 catalyst by one-pot synthesis for low-temperature NH3-SCR
TL;DR: In this paper , the influence of Mn doping on FeVO4 in the selective catalytic reduction of NOx with NH3 (NH3-SCR) reaction was in-depth studied.
Journal ArticleDOI
The deposition of VWOx on the CuCeOy microflower for the selective catalytic reduction of NOx with NH3 at low temperatures.
Cihang Niu,Yao Wang,Dongwei Ren,Lei Xiao,Ruibin Duan,Baorui Wang,Xinbo Wang,Yurong Xu,Zhihui Li,Jian-Wen Shi +9 more
TL;DR: A new carrier, CuCeOy microflower assembled from a large number of copper-cerium mixed oxide nanosheets, is firstly developed to load vanadium-tungsten mixed oxides (VWOx) for the SCR of NOx with NH3, exhibiting significantly enhanced low-temperature de-NOx performance.
Journal ArticleDOI
Research progress on selective catalytic reduction (SCR) catalysts for NO removal from coal-fired flue gas
TL;DR: In this article , the preparation method, composition, de NOx ability, influence of flue gas components, and deNOx mechanism of the SCR catalysts were comprehensively discussed according to classification on the different catalyst supports published in the nearly ten years.
References
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Journal ArticleDOI
Urea-SCR: a promising technique to reduce NOx emissions from automotive diesel engines
TL;DR: In this article, the authors discuss the fundamental problems and challenges if urea-SCR is extended to mobile applications, including the control strategy for urea dosing, the high freezing point of urea, and the long term stability of the catalyst.
Journal ArticleDOI
Excellent activity and selectivity of Cu-SSZ-13 in the selective catalytic reduction of NOx with NH3
TL;DR: In this paper, the performance of a Cu ion-exchanged SSZ-13 zeolite in the selective catalytic reduction (SCR) of NO x with NH 3 was observed, in comparison with Cu-beta and ZSM-5 zeolites.
Journal ArticleDOI
DRIFT Study on Cerium−Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3
Liang Chen,Junhua Li,Maofa Ge +2 more
TL;DR: Tungstation was beneficial for the formation of Ce(3+), which would influence the active sites of the catalyst and further change the mechanisms of SCR reaction, resulting in the better activity of CeO (2)-WO(3)/TiO(2) compared to that of CeCe(2)/Ti O(2).
Journal ArticleDOI
Nickel-doped Mn/TiO2 as an efficient catalyst for the low-temperature SCR of NO with NH3: Catalytic evaluation and characterizations
TL;DR: In this article, a series of Mn-Ni/TiO 2 catalysts were prepared by adopting incipient wetness technique and investigated for low-temperature SCR of NO with NH 3 in the presence of excess oxygen.
Journal ArticleDOI
DRIFT study of manganese/ titania-based catalysts for low-temperature selective catalytic reduction of NO with NH3.
TL;DR: The DRIFT spectroscopy for the adsorption of NH3 indicated the presence of coordinated NH3 and NH4+ on both of the two catalysts, indicating these species could react with NO effectively.