Oxygen storage capacity improvement using CeO2-ZrO2 mixed oxides in three way catalysts

1999 ◽  
pp. 257-262 ◽  
Author(s):  
Elisabetta Finocchio ◽  
Marco Daturi ◽  
Claude Binet ◽  
Jean Claude Lavalley ◽  
Fabienne Flly ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Mixed Oxides ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Capacity Improvement

Structure and Oxygen Storage Capacity of Pr/Nd Doped CeO2—ZrO2 Mixed Oxides.

ChemInform ◽  
2007 ◽  
Vol 38 (44) ◽  
Author(s):  
Xiaodi Wu ◽  
Xiaodong Wu ◽  
Qing Liang ◽  
Jun Fan ◽  
Duan Weng ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Mixed Oxides ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Doped Ceo2

Oxygen Storage Capacity of CexZr1-xO2 (0.4≤x≤0.8) Solid Solution Using Thermogravimetric Analysis

2013 ◽  
Vol 747 ◽  
pp. 579-582 ◽  
Author(s):  
N. Shanmuga Priya ◽  
Chandramohan Somayaji ◽  
S. Kanagaraj
Keyword(s):  
Solid Solution ◽  
Storage Capacity ◽  
Mixed Oxides ◽  
High Surface ◽  
High Surface Area ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Co Precipitation ◽  
Good Number ◽  
High Oxygen Storage Capacity

The property of high oxygen storage capacity (OSC) of Ceria is an important component in three-way catalysts (TWC), which depends on the low reduction temperature, high surface area and stable crystalline structure. These are required to be improved using mixed oxides for the increased OSC of TWC. Though a good number of literature is available in Ceria-Zirconia mixed oxides, optimization of the composition of oxides based on OSC is very much limited. Hence, an attempt was made to optimize the composition of CexZr1-xO2 (0.4 x 0.8) (CZ) based on the OSC using thermogravimetric technique. The CZ solid solution was prepared by co-precipitation (COP) method using Ceria nitrate, and Zirconia oxy-choloride precursors, where the freshly prepared metal hydroxide precipitates were continuously stirred at 45 °C for 60 minutes followed by washing and drying to obtain the nanosized CZ particles. The formation of single nanocrystallite with less than 8 nm size solid solution was identified by XRD, and the same was confirmed by Micro Raman studies. It is observed that the trend of OSC in CZ solid solution was based on the ratio of Ce to Zr in the starting aqueous solution, where the OSC was found to be maximum at 1.5 and the corresponding OSC of the compound was about 0.14 μmol per gram of Ceria.

scholarly journals Effect of Sr on the properties of Ce-Zr-La mixed oxides

2006 ◽  
Vol 71 (3) ◽  
pp. 285-291 ◽  
Author(s):  
Richuan Rao ◽  
LI Lianyong ◽  
LI Fengyi
Keyword(s):  
Mixed Oxide ◽  
Storage Capacity ◽  
Mixed Oxides ◽  
Sol Gel ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
X Ray Diffraction ◽  
Pulse Technique ◽  
X Ray ◽  
Good Thermal Stability

Ce-Zr-La-Sr mixed oxides, with different Sr contents, were prepared by the sol-gel method. In a flow-system microreactor, the reduction properties and the oxygen storage capacity (OSC) of the Ce-Zr-La-Sr mixed oxides were investigated by a temperature programmed reduction (TPR) and a pulse technique. It was shown that the properties of the Ce-Zr-La mixed oxides depend on the Sr content and that the optimum Sr content in the Ce-Zr-La-Sr mixed oxide is 3 mol%. The Ce-Zr-La-Sr mixed oxides doped with 3 mol% Sr (Ce0.52Zr0.4La0.05Sr0.03O1.945) has the largest specific surface area and better reduction properties and oxygen storage capacity in comparison to the other investigated samples. The XRD results of the Ce-Zr-La-Sr mixed oxides showed that their X-ray diffraction patterns are well in agreement with that of fluorite-type CeO2 with Sr ions incorporated into the Ce-Zr-La mixed oxide structures. With increasing calcination temperature, the intensity of the X-ray diffraction peaks increased, but no new peaks were observed. All of these indicate that the synthesized samples had good thermal stability.

Structure and oxygen storage capacity of Pr-doped Ce0.26Zr0.74O2 mixed oxides

2011 ◽  
Vol 29 (11) ◽  
pp. 1053-1059 ◽  
Author(s):  
Rui RAN ◽  
Duan WENG ◽  
Xiaodong WU ◽  
Jun FAN ◽  
Lei WANG ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Mixed Oxides ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage

Enhanced hydrothermal stability and oxygen storage capacity of La3+ doped CeO2-γ-Al2O3 intergrowth mixed oxides

2015 ◽  
Vol 41 (10) ◽  
pp. 12988-12995 ◽  
Author(s):  
Liang Wang ◽  
Meina Huang ◽  
Bin Li ◽  
Lihui Dong ◽  
Guangzhou Jin ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Mixed Oxides ◽  
Oxygen Storage Capacity ◽  
Hydrothermal Stability ◽  
Oxygen Storage ◽  
Doped Ceo2

Modification of the oxygen storage capacity of CeO2–ZrO2 mixed oxides after redox cycling aging

2000 ◽  
Vol 59 (3-4) ◽  
pp. 373-386 ◽  
Author(s):  
F Fally ◽  
V Perrichon ◽  
H Vidal ◽  
J Kaspar ◽  
G Blanco ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Mixed Oxides ◽  
Oxygen Storage Capacity ◽  
Redox Cycling ◽  
Oxygen Storage
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