scholarly journals Low-Temperature Synthesis and Catalytic Activity of Cobalt Ferrite in Nitrous Oxide (N2O) Decomposition Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 889
Author(s):  
Kristina Denisova ◽  
Alexander A. Ilyin ◽  
Ruslan Rumyantsev ◽  
Julia Sakharova ◽  
Alexander P. Ilyin ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Cobalt Ferrite ◽  
Mechanochemical Activation ◽  
Solid Phase ◽  
N2o Decomposition ◽  
Nitrogen Adsorption ◽  
Decomposition Reaction ◽  
Nitrous Oxide Decomposition

Cobalt ferrite (CoFe2O4) nanoparticles were synthesized and investigated as a catalyst in the reaction of nitrous oxide (N2O) decomposition. Cobalt ferrite was synthesized by solid–phase interaction at 1100 °C and by preliminary mechanochemical activation in a roller-ring vibrating mill at 400 °C. The nanoparticles were characterized by X-ray diffraction (XRD), synchronous thermal analysis (TG and DSC) and scanning electron microscopy (SEM). A low-temperature nitrogen adsorption/desorption test was used to evaluate the catalytic activity of the cobalt ferrite nanoparticles. Correlations between the structure and catalytic properties of the catalysts are reported. The highest catalytic activity of CoFe2O4 in the reaction of nitrous oxide decomposition was 98.1% at 475 °C for cobalt ferrite obtained by mechanochemical activation.

Direct N2O decomposition over Yb2O3-CuO catalysts with C-type cubic structure

2020 ◽  
Vol 13 (08) ◽  
pp. 2050040
Author(s):  
Chang-Min Cho ◽  
Naoyoshi Nunotani ◽  
Nobuhito Imanaka
Keyword(s):  
Nitrous Oxide ◽  
Catalytic Activity ◽  
Water Vapor ◽  
N2o Decomposition ◽  
Redox Properties ◽  
High Durability ◽  
Oxygen Gas ◽  
Cubic Structure ◽  
Oxide Ion

Novel Yb2O3-CuO catalysts with C-type cubic structure were synthesized for direct nitrous oxide (N2O) decomposition. By introducing Cu[Formula: see text] ions into Yb2O3 lattice, the enhancement in the catalytic activity was recognized owing to the improvement of redox properties and the generation of oxide ion vacancies. Among the catalysts prepared, the highest activity was obtained for the (Yb[Formula: see text]Cu[Formula: see text]O[Formula: see text] catalyst, and the complete N2O decomposition was achieved at the temperature as low as 400[Formula: see text]C. In addition, the catalyst showed high durability for co-existing of oxygen gas and water vapor.

scholarly journals Effect of Water Molecule on Photo-Assisted Nitrous Oxide Decomposition over Oxotitanium Porphyrin: A Theoretical Study

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 157
Author(s):  
Phornphimon Maitarad ◽  
Vinich Promarak ◽  
Liyi Shi ◽  
Supawadee Namuangruk
Keyword(s):  
Nitrous Oxide ◽  
Density Functional ◽  
Catalyst Deactivation ◽  
Activation Barrier ◽  
N2o Decomposition ◽  
Density Functional Theory Calculations ◽  
Catalytic Performance ◽  
Nitrous Oxide Decomposition ◽  
Catalytic Reactors ◽  
Rate Determining Step

Water vapor has generally been recognized as an inhibitor of catalysts in nitrous oxide (N2O) decomposition because it limits the lifetime of catalytic reactors. Oxygen produced in reactions also deactivates the catalytic performance of bulk surface catalysts. Herein, we propose a potential catalyst that is tolerant of water and oxygen in the process of N2O decomposition. By applying density functional theory calculations, we investigated the reaction mechanism of N2O decomposition into N2 and O2 catalyzed by oxotitanium(IV) porphyrin (TiO-por) with interfacially bonded water. The activation energies of reaction Path A and B are compared under thermal and photo-assisted conditions. The obtained calculation results show that the photo-assisted reaction in Path B is highly exothermic and proceeds smoothly with the low activation barrier of 27.57 kcal/mol at the rate determining step. The produced O2 is easily desorbed from the surface of the catalyst, requiring only 4.96 kcal/mol, indicating the suppression of catalyst deactivation. Therefore, TiO-por is theoretically proved to have the potential to be a desirable catalyst for N2O decomposition with photo-irradiation because of its low activation barrier, water resistance, and ease of regeneration.

scholarly journals Decomposition of Nitrous Oxide over Cu/TiO2 Catalysts: The Effect of Cu Loading, TiO2 Structure, and Reaction Conditions

2019 ◽  
Vol 1 (2) ◽  
pp. 99
Author(s):  
K. Yanagida ◽  
W. Kurniawan ◽  
C. Salim ◽  
H. Hinode
Keyword(s):  
Nitrous Oxide ◽  
Catalytic Activity ◽  
Water Vapor ◽  
N2o Decomposition ◽  
Rutile Structure ◽  
Influence Of Water ◽  
Tio2 Support ◽  
Cu Catalyst ◽  
The Relationship ◽  
Decomposition Of Nitrous Oxide

Decomposition of nitrous oxide (N2O) over titania (TiO2) supported copper (Cu) catalyst was investigated with the existence of oxygen and water vapor. The catalytic activity of TiO2 was promoted by copper loading. It was found that there are optimum levels of copper loading on TiO2, and these values are correlated to the specific surface area of TiO2 support being used. The relationship between the catalytic activity for decomposition of N2O and the crystal structure of TiO2 was also investigated. The result revealed that Cu/TiO2 catalysts with the rutile structure has a higher activity toward N2O decomposition than those with the anatase structure. In this research, Cu(5wt%)/TiO2 prepared from TiO2 JRC-TIO-4 (reference catalyst provided by Catalysis Society of Japan) which was mainly constituted of rutile showed the highest activity for N2O decomposition and it could decompose N2O completely at 650℃. The catalytic activity was inhibited by the existence of oxygen. However, there was no influence of water vapor to the catalytic activity of Cu/TiO2 for N2O decomposition. 

Nanoshaped CuO/CeO2 Materials: Effect of the Exposed Ceria Surfaces on Catalytic Activity in N2O Decomposition Reaction

ACS Catalysis ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 5357-5365 ◽  
Author(s):  
Maxim Zabilskiy ◽  
Petar Djinović ◽  
Elena Tchernychova ◽  
Olga P. Tkachenko ◽  
Leonid M. Kustov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
N2o Decomposition ◽  
Decomposition Reaction
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