Journal ArticleDOI
In Situ DRIFTs Investigation of Promotional Effects of Tungsten on MnOx-CeO2/meso-TiO2 Catalysts for NOx Reduction
Kaiwen Zha,Sixiang Cai,Hang Hu,Hongrui Li,Tingting Yan,Liyi Shi,Dengsong Zhang,Dengsong Zhang +7 more
TLDR
In this paper, mesoporous TiO2 spheres supported MnCeW mixed oxide catalysts for selective catalytic reduction of NOx with NH3 were prepared by a wet impregnation method.Abstract:
In this work, mesoporous TiO2 spheres supported MnCeW mixed oxide catalysts (MnCeW/m-TiO2) for selective catalytic reduction of NOx with NH3 were prepared by a wet impregnation method. It is interesting that the MnCeW/m-TiO2 catalysts exhibited excellent SCR activity and N2 selectivity in a wide temperature range, even under the high gas hourly space velocity. From in situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTs) studies of desorption, it could be concluded that the addition of tungsten brought about more Bronsted acid sites and reduced the energy barrier of NOx species adsorbed on the surface. At high temperature range, there were still some Bronsted acid sites and NOx species including bidentate nitrate and nitro compounds in MnCeW/m-TiO2, therefore more intermediates could take part in the SCR reactions as well as better catalytic performance. Besides, the in situ DRIFTs of transient reactions indicated that the formed NH3 species and NOx species of MnCeW/m-TiO2 were more re...read more
Citations
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Journal ArticleDOI
Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects.
Lupeng Han,Sixiang Cai,Sixiang Cai,Min Gao,Jun-ya Hasegawa,Penglu Wang,Jianping Zhang,Liyi Shi,Dengsong Zhang +8 more
TL;DR: This review summarizes the latest SCR reaction mechanisms and emerging poison-resistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VOx, MnOx, CeO2, and Fe2O3 to CuO based catalysts.
Journal ArticleDOI
Synthesis of Bi2WO6 with gradient oxygen vacancies for highly photocatalytic NO oxidation and mechanism study
TL;DR: In this paper, the formation of oxygen vacancy defects in BWO is responsible for the tuning band structure and modifying surface chemical state to improve carriers separation efficiency, enlarge visible light absorption range and facilitate reactant activation.
Journal ArticleDOI
Insights into the Sm/Zr co-doping effects on N2 selectivity and SO2 resistance of a MnOx-TiO2 catalyst for the NH3-SCR reaction
Chuanzhi Sun,Chuanzhi Sun,Hao Liu,Wei Chen,Dezhan Chen,Shuohan Yu,Annai Liu,Lin Dong,Shuai Feng +8 more
TL;DR: In this paper, a series of Sm-and/or Zr-doped MnOx-TiO2 catalysts were prepared, and the catalysts exhibited better N2 selectivity and SO2 resistance than the undoped Mn Ox-Ti O2 catalyst for the selective catalytic reduction of NO by NH3 (NH3-SCR).
Journal ArticleDOI
A MnO2-based catalyst with H2O resistance for NH3-SCR: Study of catalytic activity and reactants-H2O competitive adsorption
Ningqiang Zhang,Ningqiang Zhang,Lingcong Li,Yizhong Guo,Junda He,Rui Wu,Liyun Song,Guizhen Zhang,Jinsheng Zhao,Dingsheng Wang,Hong He +10 more
TL;DR: In this paper, an interlayer Ce3+ cation (Ce-MnO2) was synthesized by ion exchange approach, which exhibited better low-temperature NH3-SCR catalytic activity as compared to Ce0.38Mn0.62O2-CP prepared by co-precipitation.
Journal ArticleDOI
One-pot synthesis of atomically dispersed Pt on MnO2 for efficient catalytic decomposition of toluene at low temperatures
TL;DR: In this article, the doping of single-atom Pt into MnO2 with a one-pot hydrothermal process greatly improved the catalytic activity for toluene degradation at room temperature.
References
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Journal ArticleDOI
Recent advances in automotive catalysis for NOx emission control by small-pore microporous materials
Andrew M. Beale,Andrew M. Beale,Feng Gao,Ines Lezcano-Gonzalez,Ines Lezcano-Gonzalez,Charles H. F. Peden,János Szanyi +6 more
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Hydrogen-treated WO3 nanoflakes show enhanced photostability
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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
A superior Ce-W-Ti mixed oxide catalyst for the selective catalytic reduction of NOx with NH3
TL;DR: In this article, a superior Ce-W-Ti mixed oxide catalyst prepared by a facile homogeneous precipitation method showed excellent NH3-SCR activity and 100% N2 selectivity with broad operation temperature window and extremely high resistance to space velocity, which is a very promising catalyst for NOx abatement from diesel engine exhaust.
Journal ArticleDOI
Performance and kinetics study for low-temperature SCR of NO with NH3 over MnOx–CeO2 catalyst
Gongshin Qi,Ralph T. Yang +1 more
TL;DR: In this paper, a series of manganese-cerium oxide catalysts were prepared by different methods and used for low-temperature selective catalytic reduction (SCR) of NO x with ammonia in the presence of excess O 2.
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