Selective Reduction of NOxwith Propene under Oxidative Conditions:  Nature of the Active Sites on Copper-Based Catalysts

1997 ◽  
Vol 119 (12) ◽  
pp. 2905-2914 ◽  
Author(s):  
C. Márquez-Alvarez ◽  
I. Rodríguez-Ramos ◽  
A. Guerrero-Ruiz ◽  
G. L. Haller ◽  
M. Fernández-García
Keyword(s):  
Active Sites ◽  
Selective Reduction

Silver-alumina catalysts for selective reduction of NO by higher hydrocarbons: structure of active sites and reaction mechanism

2001 ◽  
Vol 30 (1-2) ◽  
pp. 151-162 ◽  
Author(s):  
Ken-ichi Shimizu ◽  
Junji Shibata ◽  
Hisao Yoshida ◽  
Atsushi Satsuma ◽  
Tadashi Hattori
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Selective Reduction ◽  
Reduction Of No ◽  
Higher Hydrocarbons ◽  
Alumina Catalysts

Influence of the preparation method on the selective reduction of nitric oxide over Cu-ZSM-5. Nature of the active sites

1994 ◽  
Vol 4 (2-3) ◽  
pp. 199-211 ◽  
Author(s):  
Zakaria Chajar ◽  
Michel Primet ◽  
Hélène Praliaud ◽  
Miche`le Chevrier ◽  
Catherine Gauthier ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Active Sites ◽  
Preparation Method ◽  
Selective Reduction

scholarly journals An Investigation on the Promoting Effect of Pr Modification on SO2 Resistance Over MnOx Catalysts for Selective Reduction of NO with NH3

2021 ◽  
Author(s):  
Guangpeng Zhai ◽  
Zhitao Han ◽  
Huan Du ◽  
Yu Gao ◽  
Xinxiang Pan
Keyword(s):  
Active Sites ◽  
Manganese Oxides ◽  
Catalyst Surface ◽  
Selective Reduction ◽  
Future Application ◽  
Precipitation Process ◽  
Promoting Effect ◽  
In Situ Drifts ◽  
Co Precipitation

Abstract Manganese oxides (MnOx) exhibit excellent low-temperature activities in SCR reaction of NO with NH3, and they are considered as a promising catalyst for future application. However, MnOx still suffer from poor resistance to SO2 and H2O. In this work, Pr was used to modify MnOx catalysts via co-precipitation process, and MnPrOx catalyst exhibited superior SO2 resistance over pure MnOx catalyst. A series of characterization techniques, such as XRD, BET, H2-TPR, XPS, TG and in-situ DRIFTS, were adopted to explore the promoting effect of Pr modification on SO2 resistance over MnOx catalyst in detail. The results indicated that, in the presence of SO2 in feed gas, it seemed that PrOx rather than MnOx were apt to react with SO2, which was favorable to protect Mn active sites on the catalyst surface to some extent. It was known that there was strong competitive adsorption between SO2 and NH3/NO species on SCR catalyst surface. In-situ DRIFTS results revealed that the adsorption of NH3 and NO on MnOx catalyst had been severely suppressed after the introduction of SO2, resulting in the relevant SCR reactions following either L-H or E-R mechanisms would be inhibited obviously. But for Pr-modified MnOx catalyst, the introduction of SO2 almost had no effect on the adsorption of NH3 on catalyst surface, while it exerted a relatively noticeable impact on the adsorption of NO. As a result, SCR reactions occurred on Pr-modified MnOx catalyst surface could still proceed in a near-normal way through E-R rather than L-H mechanisms. Therefore, Pr modification on MnOx catalyst exhibited a distinctively promoting effect on SO2 resistance performance in SCR process.

Identifying active sites of CoNC/CNT from pyrolysis of molecularly defined complexes for oxidative esterification and hydrogenation reactions

2016 ◽  
Vol 6 (4) ◽  
pp. 1007-1015 ◽  
Author(s):  
Tianyuan Cheng ◽  
Hao Yu ◽  
Feng Peng ◽  
Hongjuan Wang ◽  
Bingsen Zhang ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Molecular Oxygen ◽  
Active Sites ◽  
Selective Reduction ◽  
Chelate Complexes ◽  
Oxidative Esterification ◽  
Graphene Lattice ◽  
Hydrogenation Reactions

Cobalt chelate complexes bonded to 2 to 3 nitrogens in the graphene lattice are the active sites for the oxidative esterification of benzyl alcohol by molecular oxygen, the selective reduction of nitrobenzene by hydrogen and the hydrogenated coupling of nitrobenzene and benzaldehyde.

The Active Sites in the Selective Reduction of Nitrobenzene by Cobalt Aluminum Oxide Catalysts

1996 ◽  
Vol 161 (1) ◽  
pp. 459-464 ◽  
Author(s):  
S. Meijers ◽  
T.P.Pruys van der Hoeven ◽  
V. Ponec ◽  
J.P. Jacobs ◽  
H.H. Brongersma
Keyword(s):  
Aluminum Oxide ◽  
Active Sites ◽  
Selective Reduction ◽  
Oxide Catalysts

scholarly journals Single-atom catalysts reveal the dinuclear characteristic of active sites in NO selective reduction with NH3

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Weiye Qu ◽  
Xiaona Liu ◽  
Junxiao Chen ◽  
Yangyang Dong ◽  
Xingfu Tang ◽  
...  
Keyword(s):  
Active Sites ◽  
Selective Reduction ◽  
Single Atom ◽  
No Selective Reduction
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