Polymorphous transformation of rod-shaped iron oxides and their catalytic properties in selective reduction of NO by NH3

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 66141-66146 ◽  
Author(s):  
Xuejiao Wei ◽  
Yan Zhou ◽  
Yong Li ◽  
Wenjie Shen
Keyword(s):  
Iron Oxides ◽  
Catalytic Properties ◽  
Selective Reduction ◽  
Polymorphous Transformation ◽  
Reduction Of No

Polymorphous transformation of rod-shaped γ-Fe2O3 was applied to fabricate Fe3O4/Fe2O3 nanorods and their activities in NH3-SCR followed the order γ-Fe2O3 > α-Fe2O3 > Fe3O4.

scholarly journals On the Structure-Activity Relationship for NO-SCR with NH3 Catalyzed by Cu-exchanged Natural Chabazite and SSZ-13

2021 ◽  
Vol 65 (1) ◽  
Author(s):  
Julio C. López-Curiel ◽  
Gabriela I. Hernández-Salgado ◽  
Maria E. Hernández-Terán ◽  
Gustavo A. Fuentes
Keyword(s):  
Catalytic Properties ◽  
Selective Reduction ◽  
Charge Compensation ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Reduction Of No ◽  
Diesel Vehicles ◽  
Structure Activity ◽  
No Scr ◽  
Exchange Level

Abstract. In spite of their similar structures, the catalytic properties of natural and synthetic (SSZ-13) Chabazite during the selective reduction of NO with NH3 have a different dependence on the Cu exchange level when tested under conditions equivalent to those found in Diesel vehicles. At low (1-2 wt.%) and high copper loadings (6-14 wt.%), their activities differ, because there are variations in the different species of Cu (Cu+, Cu2+, Cu-O-Cu) detected by UV-Vis. At intermediate Cu loadings (2-3 wt.%) they have similar high activities, reaching 100 % conversion. High deNOx activity per Cu site appears to correlate with the predominance of charge compensation Cu2+ species over CuOx moieties. There are changes in the distribution of Cu moieties during operation of both catalysts, evidenced by DR-UV-Vis.            Resumen. A pesar de sus estructuras similares, las propiedades catalíticas de Chabazita natural y sintética (SSZ-13) durante la reducción selectiva de NO con NH3 dependen de manera diferente frente al nivel de intercambio con Cu cuando se prueban bajo condiciones equivalentes a las de vehículos Diesel. A bajos (1-2 % p/p) y altos contenidos de Cu (6-14 % p/p) la reducción de NO es diferente debido a variaciones en las distintas especies de Cu (Cu+, Cu2+, Cu-O-Cu) observadas por UV-Vis. Por su parte, los catalizadores intercambiados con 2-3 % p/p de Cu tuvieron alta actividad por sitio de Cu, alcanzando 100 % de conversión de NO, lo que parece deberse a la predominancia de especies de Cu2+ sobre especies CuOx de acuerdo con el análisis por DR-UV-Vis, el que también muestra la existencia de variaciones en la distribución de especies de Cu debido a la reacción.

Catalytic properties of AgAlBEA and AgSiBEA zeolites in H 2 -promoted selective reduction of NO with ethanol

2015 ◽  
Vol 203 ◽  
pp. 163-169 ◽  
Author(s):  
Nataliia Popovych ◽  
Pavlo Kyriienko ◽  
Sergiy Soloviev ◽  
Svitlana Orlyk ◽  
Stanislaw Dzwigaj
Keyword(s):  
Catalytic Properties ◽  
Selective Reduction ◽  
Reduction Of No

Oxidation and selective reduction of NO over Fe-ZSM-5 – How related are these reactions?

2014 ◽  
Vol 311 ◽  
pp. 199-211 ◽  
Author(s):  
Inga Ellmers ◽  
Roxana Pérez Vélez ◽  
Ursula Bentrup ◽  
Angelika Brückner ◽  
Wolfgang Grünert
Keyword(s):  
Selective Reduction ◽  
Reduction Of No

Reactivity of surface nitrate species in the selective reduction of NO with propene over Na[ndash ]H-mordenite as investigated by dynamic FTIR spectroscopy

1998 ◽  
Vol 94 (2) ◽  
pp. 301-307 ◽  
Author(s):  
Atsushi Satsuma ◽  
Takayuki Enjoji ◽  
Ken-ichi Shimizu ◽  
Kazuhiro Sato ◽  
Hisao Yoshida ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Selective Reduction ◽  
Reduction Of No ◽  
Nitrate Species

Ir/SiO2 as a Highly Active Catalyst for the Selective Reduction of NO with CO in the Presence of O2 and SO2.

ChemInform ◽  
2004 ◽  
Vol 35 (5) ◽  
Author(s):  
Masaaki Haneda ◽  
Tomohiro Yoshinari ◽  
Kazuhito Sato ◽  
Yoshiaki Kintaichi ◽  
Hideaki Hamada
Keyword(s):  
Active Catalyst ◽  
Selective Reduction ◽  
Reduction Of No ◽  
Highly Active

Preparation and characterization of VO-ZSM5 catalyst for the selective reduction of NO with ammonia

2005 ◽  
Vol 59 (24-25) ◽  
pp. 2986-2989 ◽  
Author(s):  
A. Lavat ◽  
C.E. Quincoces ◽  
M.G. González
Keyword(s):  
Selective Reduction ◽  
Reduction Of No
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