High Oxygen Storage Ceria-Zirconia Solid Solutions Synthesized by Atmospheric Pressure Solvothermal Process

Ceria-zirconia solid solution is one of the most important components of three way catalyst (TWC) for cleaning automotive exhaust. Ceria-zirconia solid solution has a function as an oxygen storage material, which keeps air to fuel ratio (A/F) at the surface of TWC on a stoichiometric composition. The dissolved zirconia into ceria lattice makes cerium ions to be reduced easier and enhances especially bulk oxygen to release. However, there is a large difference of oxygen storage capacity (OSC) between a theoretical value and that of the prior ceria zirconia solid solutions. The cause of the large difference of OSC might be come from the inhomogeneous dispersion of Zr ions in ceria lattice. Atmospheric pressure solvothermal (APS) process was applied to ceria-zirconia solid solutions in this study. The APS ceria-zirconia showed excellent OSC. The excellent OSC performance was presumed to come from further uniformity of zirconium ions in the ceria lattice.

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Atmospheric pressure solvothermal synthesis of ceria–zirconia solid solutions and their large oxygen storage capacity

Journal of Materials Science ◽

10.1007/s10853-007-2111-y ◽

2007 ◽

Vol 43 (7) ◽

pp. 2258-2262 ◽

Cited By ~ 13

Author(s):

Akihiko Suda ◽

Kae Yamamura ◽

Akira Morikawa ◽

Yasutaka Nagai ◽

Hideo Sobukawa ◽

...

Keyword(s):

Solid Solutions ◽

Atmospheric Pressure ◽

Solvothermal Synthesis ◽

Storage Capacity ◽

Oxygen Storage Capacity ◽

Oxygen Storage

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High Oxygen Storage Ceria-Zirconia Solid Solutions Synthesized by Atmospheric Pressure Solvothermal Process

Innovation in Ceramic Science and Engineering - Key Engineering Materials ◽

10.4028/0-87849-454-5.287 ◽

2007 ◽

pp. 287-292

Author(s):

Akihiko Suda ◽

Kae Yamamura ◽

Akira Morikawa ◽

Yasutaka Nagai ◽

Hideo Sobukawa ◽

...

Keyword(s):

Solid Solutions ◽

Atmospheric Pressure ◽

High Oxygen ◽

Oxygen Storage ◽

Solvothermal Process

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ChemInform Abstract: Rh-Loaded CeO2-ZrO2 Solid Solutions as Highly Efficient Oxygen Exchangers: Dependence of the Reduction Behavior and the Oxygen Storage Capacity on the Structural Properties.

ChemInform ◽

10.1002/chin.199533018 ◽

2010 ◽

Vol 26 (33) ◽

pp. no-no ◽

Cited By ~ 2

Author(s):

P. FORNASIERO ◽

R. DI MONTE ◽

G. R. RAO ◽

J. KASPAR ◽

S. MERIANI ◽

...

Keyword(s):

Structural Properties ◽

Solid Solutions ◽

Storage Capacity ◽

Oxygen Storage Capacity ◽

Oxygen Storage ◽

Reduction Behavior ◽

Highly Efficient

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The Effect of Potassium Carbonate on the Catalytic Properties for Methane Conversion with Ceria

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.161.194 ◽

2012 ◽

Vol 161 ◽

pp. 194-199

Author(s):

Yue Juan Duan ◽

Hua Wang ◽

Yong Gang Wei ◽

Kong Zhai Li ◽

Xing Zhu ◽

...

Keyword(s):

Solid Solution ◽

Storage Capacity ◽

Catalytic Properties ◽

Fixed Bed ◽

Oxygen Storage Capacity ◽

Fixed Bed Reactor ◽

Oxygen Storage ◽

Incipient Wetness Impregnation ◽

Solid Reaction ◽

Gaseous Oxidant

Pure CeO2and a series of (x %) K-CeO2(x=1, 2, 3, 4) catalysts were respectively prepared by the precipitation and incipient wetness impregnation methods, and characterized by means of XRD, BET and H2-TPR techniques. The catalytic activity was investigated by the gas-solid reaction with methane in the absence of gaseous oxidant in a fixed bed reactor at 800 °C. The XRD measurement showed that doping of K2CO3did not change the structure of CeO2with the addition of K2CO3 without formation of Ce-K-O solid solution in these materials. Surface area of catalysts wasSubscript textdecreased with the impregnation amount of K2CO3. Reducibility of catalysts was obviously enhanced by the addition of K2CO3as shown in H2-TPR tests. The catalysts activity tests indicated that adding K2CO3to CeO2could promote the oxygen storage capacity of catalysts. K species in CeO2could affect the CO formation in methane oxidation.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.747.579 ◽

2013 ◽

Vol 747 ◽

pp. 579-582 ◽

Cited By ~ 1

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.

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