Influence of Gd and Pr doping on the properties of ceria: texture, structure, redox behaviour and reactivity in CH4/H2O reactions in the presence of H2S

2018 ◽  
Vol 8 (5) ◽  
pp. 1333-1348 ◽  
Author(s):  
M. Florea ◽  
G. Postole ◽  
F. Matei-Rutkovska ◽  
A. Urda ◽  
F. Neaţu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Redox Properties ◽  
Redox Behaviour ◽  
Texture Structure ◽  
Thermal Sintering

Resistance against thermal sintering, redox properties and catalytic activity in SMR over ceria can be tuned by doping/undoping.

Templated Synthesis of Pr-Doped Ceria with Improved Micro and Mesoporosity Porosity, Redox Properties and Catalytic Activity

2017 ◽  
Vol 148 (1) ◽  
pp. 258-266 ◽  
Author(s):  
Arantxa Davó-Quiñonero ◽  
Jorge González-Mira ◽  
Dolores Lozano-Castelló ◽  
Agustín Bueno-López
Keyword(s):  
Catalytic Activity ◽  
Redox Properties ◽  
Doped Ceria ◽  
Templated Synthesis

Remarkable Activity of Nanoarchitectonics Mesoporous CuO/CeO2–TiO2 Prepared by Nanocasting and Deposition Precipitation Techniques

2020 ◽  
Vol 20 (5) ◽  
pp. 2791-2802
Author(s):  
Duangamol Ongmali ◽  
Sakollapath Pithakratanayothin ◽  
Sureerat Jampa ◽  
Apanee Luengnaruemitrchai ◽  
Thanyalak Chaisuwan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Crystallite Size ◽  
Oxygen Vacancies ◽  
Redox Properties ◽  
Oxygen Defect ◽  
Nitrate Salt ◽  
Hard Template ◽  
Different Levels

In this work, a ceria (CeO2) support was modified with titania (TiO2) by nanocasting using MCM-48 as a hard template and then loading Cu (as the nitrate salt) at different levels (3–9% by weight) by deposition-precipitation followed by calcination. The addition of TiO2 in MSP CeO2 revealed that the MSP CeO2 was significantly improved the oxygen vacancies of the catalyst by increasing the Ce3+ content from 38 to 75% and stabilizing the Ce3+ species by bonding with the oxygen as Ce(4f)-O(2p)-Ti(3d). Moreover, the bonding of MSP CeO2 with TiO2 generated the oxygen defect vacancies (s–Ti3+), allowing Cu2+ to occupy and be reduced to Cu+ during calcination. The smaller CeO2 crystallite size (2.7 nm) of 9Cu/CeO2–TiO2 increased the mass-specific CO-Oxidation, showing the best catalytic activity due to its highest redox properties, as determined by H2-TPR and also showing resistant property to water and carbon dioxide. Indeed, water was adsorbed on the Ce3+ sites, generating OHads which reacted with CO to form –COOH, resulting in CO2.

Effect of Addition of Ce on the Catalytic Activity of Fe-Mn-O Catalyst for SCR of NOX with NH3

2011 ◽  
Vol 347-353 ◽  
pp. 453-456
Author(s):  
Hai Zhao ◽  
You Ning Xu ◽  
Duo Jiao Guan
Keyword(s):  
Nitric Oxide ◽  
Catalytic Activity ◽  
Analysis Data ◽  
Redox Properties ◽  
Nanosized Particles ◽  
Study Analysis ◽  
Catalytic Activities ◽  
Mn Oxide ◽  
Scr Of No ◽  
Mn Species

Fe-Mn oxide and Ce-doped Fe-Mn oxide nanosized particles were studied on the structural and catalytic activities for SCR. The catalysts were characterized by TEM, TPR and BET study. Analysis data show that the addition of Ce improves the reduction performance of Fe-Mn species. It was found that the Ce promoted samples exhibited much better activities for SCR of nitric oxide with ammonia because of the promotion of the structural and redox properties.

Probing surface-sensitive redox properties of VOx/TiO2 catalyst nanoparticles

Nanoscale ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 7266-7272
Author(s):  
Martin Ek ◽  
Logi Arnarson ◽  
Poul Georg Moses ◽  
Søren B. Rasmussen ◽  
Magnus Skoglundh ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Redox Properties ◽  
Catalyst Nanoparticles ◽  
Tio2 Catalyst

Differences in redox properties are measured at individual facets under reaction-like conditions, explaining variations in catalytic activity on the nanoscale.

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.

Sign in / Sign up

Export Citation Format

Share Document