Direct N2O decomposition over ex-framework FeMFI catalysts. Role of extra-framework species

2002 ◽  
Vol 3 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Javier Pérez-Ramı́rez ◽  
Freek Kapteijn ◽  
Guido Mul ◽  
Jacob A Moulijn
Keyword(s):  
N2o Decomposition ◽  
Framework Species

Experimental and DFT studies of N2O decomposition over bare and Co-doped magnesium oxide—insights into the role of active sites topology in dry and wet conditions

2008 ◽  
Vol 137 (2-4) ◽  
pp. 423-428 ◽  
Author(s):  
Paweł Stelmachowski ◽  
Filip Zasada ◽  
Witold Piskorz ◽  
Andrzej Kotarba ◽  
Jean-Francois Paul ◽  
...  
Keyword(s):  
Magnesium Oxide ◽  
Active Sites ◽  
N2o Decomposition ◽  
Dft Studies ◽  
Dry And Wet Conditions ◽  
Co Doped

scholarly journals Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

2016 ◽  
Vol 180 ◽  
pp. 622-629 ◽  
Author(s):  
G. Grzybek ◽  
P. Stelmachowski ◽  
S. Gudyka ◽  
P. Indyka ◽  
Z. Sojka ◽  
...  
Keyword(s):  
N2o Decomposition ◽  
Active Phase ◽  
Dispersion Effect ◽  
Cobalt Spinel

Role of Adsorbed NO in N2O Decomposition over Iron-Containing ZSM-5 Catalysts at Low Temperatures

2006 ◽  
Vol 110 (22) ◽  
pp. 10691-10700 ◽  
Author(s):  
Dmitri A. Bulushev ◽  
Albert Renken ◽  
Lioubov Kiwi-Minsker
Keyword(s):  
Low Temperatures ◽  
N2o Decomposition

Catalytic Properties of ZSM-5 Zeolites in N2O Decomposition: The Role of Iron

1993 ◽  
Vol 139 (2) ◽  
pp. 435-443 ◽  
Author(s):  
V.I. Sobolev ◽  
G.I. Panov ◽  
A.S. Kharitonov ◽  
V.N. Romannikov ◽  
A.M. Volodin ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
N2o Decomposition

THE ROLE OF SURFACE OXYGEN VACANCY IN N2O DECOMPOSITION ON Cu2O(111) SURFACE: A DFT STUDY

2008 ◽  
Vol 07 (02) ◽  
pp. 263-276 ◽  
Author(s):  
WEN-KAI CHEN ◽  
BAO-ZHEN SUN ◽  
XIA WANG ◽  
CHUN-HAI LU
Keyword(s):  
Oxygen Vacancy ◽  
Density Functional ◽  
Adsorbed Molecule ◽  
N2o Decomposition ◽  
Surface Oxygen ◽  
Generalized Gradient ◽  
First Case ◽  
Surface Oxygen Vacancy ◽  
Defective Surface

The role of a surface oxygen vacancy in the N 2 O dissociation over a Cu 2 O surface was studied using density functional theory — generalized gradient approximation periodic calculations. To perform this study, surface slab model — [Formula: see text] surface cell was used. The results indicated that N 2 O adsorption properties were associated with the surface oxygen vacancies. The presence of a surface oxygen vacancy, prepared by removing one O SUF atom from [Formula: see text] supercell, makes the N 2 O decomposition possible, which was believed to occur at a oxygen vacancy site. The N 2 O decomposition at the surface oxygen vacant site depends on whether the molecule is adsorbed with the O - or N -end on a vacancy. For the first case, the reaction proceeds spontaneously, which leads to an ejection of N 2 from the surface and the rest of the oxygen atoms occupying the vacancy. In the second case, even though there is an elongation of both N – N and N – O bonds, the dissociation is unfeasible due to very small adsorption energy and high activation energy. The role of the defective surface with surface oxygen vacancy is to provide electrons to the adsorbed molecule.

Role of the Fe-zeolite structure and iron state in the N2O decomposition: Comparison of Fe-FER, Fe-BEA, and Fe-MFI catalysts

2009 ◽  
Vol 262 (1) ◽  
pp. 27-34 ◽  
Author(s):  
K. Jíša ◽  
J. Nováková ◽  
M. Schwarze ◽  
A. Vondrová ◽  
S. Sklenák ◽  
...  
Keyword(s):  
N2o Decomposition ◽  
Iron State ◽  
Zeolite Structure

Role of Cadmium Addition in Promoting the Direct N2O Decomposition of Co3O4 Spinel

2020 ◽  
Vol 09 ◽  
Author(s):  
B.M. Abu-Zied ◽  
S.A. Soliman ◽  
S.E. Abdellah
Keyword(s):  
N2o Decomposition ◽  
Atomic Absorption Spectrophotometry ◽  
Direct Decomposition ◽  
Co Catalysts ◽  
Lack Of Information ◽  
Activity Performance ◽  
Co Precipitation ◽  
Adsorption Desorption

Background: The increased concerns about our environment protection urge more effort to develop new catalysts for the abetment of the greenhouse gases. N2O is known as a powerful greenhouse gas. The literature review revealed that various catalysts have been developed for the direct decomposition of N2O. Special attention was given to the cobalt-based spinel oxides. However, there are a lack of information about the performance of the cadmium promoted spinels for N2O abetment. Objective: This paper addresses the nitrous oxide direct decomposition over a novel series of Cd-Co catalysts. Method: These catalysts, with Cd/(Cd + Co) ratios 0.00-0.333, were prepared with the aid of the co-precipitation route, which is followed by calcination at 500 °C. Characterization of these catalysts was performed employing TGA-DTA, XRD, FTIR, N2 adsorption/desorption, and atomic absorption spectrophotometry. Results: Phase analysis revealed the absence of a solid-state interaction between CdO and Co3O4. However, it was found that increasing the Cd/(Cd + Co) ratio is associated with continuous enhancement of the N2O decomposition activity. The activity was correlated with the presence of catalyst’s redox couples. Moreover, the role of the Cd presence in improving the activity was discussed. Finally, the activity performance change accompanying the calcination temperature raise was, also, investigated. Conclusions: The presence of cadmium has a positive effect on the N2O decomposition performance of Co3O4. The activity increased continuously with Cd/(Cd + Co) ratio increase over the examined range 0.083–0.333. Structural, textural, and electronic roles of cadmium were proposed.

The role of α-sites in N2O decomposition over FeZSM-5. Comparison with the oxidation of benzene to phenol

2009 ◽  
Vol 91 (1-2) ◽  
pp. 174-179 ◽  
Author(s):  
L.V. Pirutko ◽  
V.S. Chernyavsky ◽  
E.V. Starokon ◽  
A.A. Ivanov ◽  
A.S. Kharitonov ◽  
...  
Keyword(s):  
N2o Decomposition ◽  
Oxidation Of Benzene

scholarly journals Role of aggregated Fe oxo species in N2O decomposition over Fe/ZSM-5

2014 ◽  
Vol 35 (12) ◽  
pp. 1972-1981 ◽  
Author(s):  
Bo Zhang ◽  
Fudong Liu ◽  
Hong He ◽  
Li Xue
Keyword(s):  
N2o Decomposition
Sign in / Sign up

Export Citation Format

Share Document