Journal ArticleDOI
DRIFT study of manganese/ titania-based catalysts for low-temperature selective catalytic reduction of NO with NH3.
TLDR
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.Abstract:
Manganese oxides and iron-manganese oxides supported on TiO2 were prepared by the sol−gel method and used for low-temperature selective catalytic reduction (SCR) of NO with NH3. Base on the previous study, Mn(0.4)/TiO2 and Fe(0.1)−Mn(0.4)/TiO2 were then selected to carry out the in situ diffuse reflectance infrared transform spectroscopy (DRIFT) investigation for revealing the reaction mechanism. The DRIFT spectroscopy for the adsorption of NH3 indicated the presence of coordinated NH3 and NH4+ on both of the two catalysts. When NO was introduced, the coordinated NH3 on the catalyst surface was consumed rapidly, indicating these species could react with NO effectively. When NH3 was introduced into the sample preadsorbed with NO + O2, SCR reaction would not proceed on Mn(0.4)/TiO2. However, for Fe(0.1)−Mn(0.4)/TiO2 the bands due to coordinated NH3 on Fe2O3 were formed. Simultaneously, the bidentate nitrates were transformed to monodentate nitrates and NH4+ was detected. And NO2 from the oxidation of NO on ...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
Effect of manganese substitution on the structure and activity of iron titanate catalyst for the selective catalytic reduction of NO with NH3
TL;DR: In this article, the selective catalytic reduction (SCR) of NO with NH3 over manganese substituted iron titanate catalysts was investigated and the Mn substitution amounts showed obvious influence on the catalyst structure, redox behavior and NH3/NOx adsorption ability of the catalysts.
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
Ceria modified MnOx/TiO2 as a superior catalyst for NO reduction with NH3 at low-temperature
TL;DR: In this article, a series of cerium modified MnOx/TiO2 catalysts were prepared by sol-gel method and used for low-temperature selective catalytic reduction (SCR) of NOx with ammonia.
Journal ArticleDOI
Rational Design of High-Performance DeNOx Catalysts Based on MnxCo3–xO4 Nanocages Derived from Metal–Organic Frameworks
TL;DR: In this paper, a deNOx catalyst based on hollow porous MnxCo3-xO4 nanocages with a spinel structure thermally derived from nanocube-like metal-organic frameworks (Mn3[Co(CN)6]2·nH2O), which are synthesized via a self-assemble method, is presented.
References
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Journal ArticleDOI
Identification of Neutral and Charged N x O y Surface Species by IR Spectroscopy
TL;DR: In this article, the infrared spectral performance of N x O y species observed on oxide surfaces [N2O, NO−, NO, (NO)2, N2O3, NO+, NO2 − (different nitro and nitrito anions), NO2, n2O4, N 2O5, NO2 and NO3 − (bridged, bidentate, and monodentate nitrates)] is considered.
Journal ArticleDOI
Activity and selectivity of pure manganese oxides in the selective catalytic reduction of nitric oxide with ammonia
TL;DR: Manganese oxides of different crystallinity, oxidation state and specific surface area have been used in the selective catalytic reduction (SCR) of nitric oxide with ammonia, indicating a relation between the SCR process and active surface oxygen.
Journal ArticleDOI
Low-temperature selective catalytic reduction of NO with NH3 over iron and manganese oxides supported on titania
Gongshin Qi,Ralph T. Yang +1 more
TL;DR: In this paper, a series of catalysts of manganese oxide supported on TiO 2 and iron-manganese oxide support with different amounts of Manganese and iron were studied for low-temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen.
Journal ArticleDOI
Characterization and FTIR Studies of MnOx−CeO2 Catalyst for Low-Temperature Selective Catalytic Reduction of NO with NH3
Gongshin Qi,Ralph T. Yang +1 more
TL;DR: In this article, a series of high-activity manganese−cerium oxide catalysts for the low-temperature (373−453 K) selective catalytic reduction (SCR) of NOx with ammonia were prepared.
Journal ArticleDOI
Mechanism of the Selective Catalytic Reduction of NO with NH3over MnOx/Al2O3
TL;DR: In this article, the mechanism of the selective catalytic reduction of NO with NH3 over low loaded MnOx/Al2O3 catalysts has been investigated using TPRD, FTIR, and step-response studies with labeled components.
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