Synergy of FexCe1−xO2 mixed oxides for N2O decomposition

2006 ◽  
Vol 239 (2) ◽  
pp. 340-346 ◽  
Author(s):  
F PEREZALONSO ◽  
I MELIANCABRERA ◽  
M LOPEZGRANADOS ◽  
F KAPTEIJN ◽  
J FIERRO
Keyword(s):  
Mixed Oxides ◽  
N2o Decomposition

Optimization of N2O decomposition activity of CuO–CeO2 mixed oxides by means of synthesis procedure and alkali (Cs) promotion

2018 ◽  
Vol 8 (9) ◽  
pp. 2312-2322 ◽  
Author(s):  
Maria Lykaki ◽  
Eleni Papista ◽  
Sónia A. C. Carabineiro ◽  
Pedro B. Tavares ◽  
Michalis Konsolakis
Keyword(s):  
Mixed Oxides ◽  
N2o Decomposition ◽  
Fine Tuning ◽  
Highly Active ◽  
Alkali Promotion ◽  
Synthesis Procedure ◽  
Co Precipitation

The fine-tuning of CuO–CeO2 mixed oxides by means of synthesis procedure (co-precipitation) and alkali promotion (1.0 at Cs per nm2) towards highly active deN2O catalysts is demonstrated.

Zn, Al, Rh-mixed oxides derived from hydrotalcite-like compound and their catalytic properties for N2O decomposition

1997 ◽  
Vol 13 (3-4) ◽  
pp. 197-203 ◽  
Author(s):  
J OI ◽  
A OBUCHI ◽  
A OGATA ◽  
G BAMWENDA ◽  
R TANAKA ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Catalytic Properties ◽  
N2o Decomposition

N2O decomposition over K-promoted NiAl mixed oxides derived from hydrotalcite-like compounds

2011 ◽  
Vol 39 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Hai-peng WU ◽  
Zhen-ying QIAN ◽  
Xiao-ling XU ◽  
Xiu-feng XU
Keyword(s):  
Mixed Oxides ◽  
N2o Decomposition

Effect of preparation method on catalytic properties of Co-Mn-Al mixed oxides for N2O decomposition

2016 ◽  
Vol 425 ◽  
pp. 237-247 ◽  
Author(s):  
A. Klyushina ◽  
K. Pacultová ◽  
K. Karásková ◽  
K. Jirátová ◽  
M. Ritz ◽  
...  
Keyword(s):  
Preparation Method ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
N2o Decomposition

scholarly journals Promotion effect of rare earth elements (Ce, Nd, Pr) on physicochemical properties of M-Al mixed oxides (M = Cu, Ni, Co) and their catalytic activity in N2O decomposition

2021 ◽  
Author(s):  
Phuoc Hoang Ho ◽  
Magdalena Jabłońska ◽  
Giada Beltrami ◽  
Annalisa Martucci ◽  
Thomas Cacciaguerra ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Mixed Oxides ◽  
N2o Decomposition ◽  
Rietveld Analysis ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Oxide Phases ◽  
Subsequent Calcination ◽  
Temperature Programmed

AbstractA series of M-AlOx mixed oxides (M = Cu, Co, Ni) with the addition of high loadings of rare earth elements (REE, R = Ce, Nd, Pr; R0.5M0.8Al0.2, molar ratio) were investigated in N2O decomposition. The precursors were prepared by coprecipitation and subsequent calcination at 600 °C. The obtained mixed metal oxides were characterized by X-ray diffraction with Rietveld analysis, N2 sorption, and H2 temperature-programmed reduction. Depending on the nature of REE and the initial M-Al system, R cations could be separately segregated in oxide form or coordinated with the transition metal cations and form mixed structures. The addition of Ce3+ consistently led to nanocrystalline CeO2 mixed with the divalent oxides, whereas the addition of Nd3+ or Pr3+ resulted in the formation of their respective oxide phases as well as perovskites/Ruddlesden–Popper phases. The presence of REE modified the textural and redox properties of the calcined materials. The rare earth element-induced formation of low-temperature reducible MOx species that systematically improved the N2O decomposition on the modified catalysts compared to the pristine M-Al materials by the order of Co > Ni > Cu. The Ce0.5Co0.8Al0.2 catalyst revealed the highest activity and remained stable (approximately 90% of N2O conversion) for 50 h during time-on-stream in 1000 ppm N2O, 200 ppm NO, 20 000 ppm O2, 2500 ppm H2O/N2 balance at WHSV = 16 L g−1 h−1.

N2O decomposition over K/Na-promoted Mg/Zn–Ce–cobalt mixed oxides catalysts

2014 ◽  
Vol 26 (7) ◽  
pp. 1437-1443 ◽  
Author(s):  
Jinli Zhang ◽  
Hui Hu ◽  
Jie Xu ◽  
Gaoming Wu ◽  
Zhaowei Zeng
Keyword(s):  
Mixed Oxides ◽  
N2o Decomposition

scholarly journals Supported Co–Mn–Al mixed oxides as catalysts for N2O decomposition

2015 ◽  
Vol 18 (10) ◽  
pp. 1114-1122 ◽  
Author(s):  
Kateřina Pacultová ◽  
Kateřina Karásková ◽  
Jana Strakošová ◽  
Květa Jirátová ◽  
Lucie Obalová
Keyword(s):  
Mixed Oxides ◽  
N2o Decomposition

scholarly journals Ceria Nanoparticles’ Morphological Effects on the N2O Decomposition Performance of Co3O4/CeO2 Mixed Oxides

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 233 ◽  
Author(s):  
Maria Lykaki ◽  
Eleni Papista ◽  
Nikolaos Kaklidis ◽  
Sόnia Carabineiro ◽  
Michalis Konsolakis
Keyword(s):  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Mixed Oxides ◽  
N2o Decomposition ◽  
Structure Property ◽  
Morphological Effect ◽  
Characterization Methods ◽  
X Ray ◽  
Ceo2 Sample ◽  
Ceria Support

Ceria-based oxides have been widely explored recently in the direct decomposition of N2O (deN2O) due to their unique redox/surface properties and lower cost as compared to noble metal-based catalysts. Cobalt oxide dispersed on ceria is among the most active mixed oxides with its efficiency strongly affected by counterpart features, such as particle size and morphology. In this work, the morphological effect of ceria nanostructures (nanorods (ΝR), nanocubes (NC), nanopolyhedra (NP)) on the solid-state properties and the deN2O performance of the Co3O4/CeO2 binary system is investigated. Several characterization methods involving N2 adsorption at −196 °C, X-ray diffraction (XRD), temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (ΤΕΜ) were carried out to disclose structure–property relationships. The results revealed the importance of support morphology on the physicochemical properties and the N2O conversion performance of bare ceria samples, following the order nanorods (NR) > nanopolyhedra (NP) > nanocubes (NC). More importantly, Co3O4 impregnation to different carriers towards the formation of Co3O4/CeO2 mixed oxides greatly enhanced the deN2O performance as compared to bare ceria samples, without, however, affecting the conversion sequence, implying the pivotal role of ceria support. The Co3O4/CeO2 sample with the rod-like morphology exhibited the best deN2O performance (100% N2O conversion at 500 °C) due to its abundance in Co2+ active sites and Ce3+ species in conjunction to its improved reducibility, oxygen kinetics and surface area.

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