Stabilisation of nanostructured Ce0.2Zr0.8O2 solid solution by impregnation on Al2O3: a suitable method for the production of thermally stable oxygen storage/release promoters for three-way catalysts

2000 ◽  
pp. 2167-2168 ◽  
Author(s):  
R. Di Monte ◽  
P. Fornasiero ◽  
J. Kašpar ◽  
M. Graziani ◽  
J. M. Gatica ◽  
...  
Keyword(s):  
Solid Solution ◽  
Suitable Method ◽  
Oxygen Storage ◽  
Thermally Stable ◽  
Stable Oxygen

scholarly journals Preparation of high oxygen storage capacity and thermally stable ceria–zirconia solid solution

2016 ◽  
Vol 6 (3) ◽  
pp. 897-907 ◽  
Author(s):  
Jie Li ◽  
Xiaofei Liu ◽  
Wangcheng Zhan ◽  
Yun Guo ◽  
Yanglong Guo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Catalytic Activity ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
High Oxygen ◽  
Coprecipitation Method ◽  
Oxygen Storage ◽  
Thermally Stable ◽  
High Oxygen Storage Capacity

Ce0.5Zr0.5O2 prepared by the complexing–coprecipitation method (CZ-2) exhibits higher oxygen storage capacity (OSC) and thermal stability than that prepared by coprecipitation (CZ-1) or the complexing–coprecipitation-solution (CZ-3) method. After being aged at 1100 °C for 6 h, CZ-2a exhibited the highest OSC and catalytic activity.

Effects of loading transition metal (Mn, Cr, Fe, Cu) oxides on oxygen storage/release properties of CeO2-ZrO2 solid solution

2020 ◽  
Vol 38 (3) ◽  
pp. 274-280 ◽  
Author(s):  
Zhizhe Zhai ◽  
Dali Cui ◽  
Yongqi Zhang ◽  
Yongke Hou ◽  
Meisheng Cui ◽  
...  
Keyword(s):  
Solid Solution ◽  
Transition Metal ◽  
Oxygen Storage

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

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.

Thermally stable oxygen implant isolation ofp‐type Al0.2Ga0.8As

1993 ◽  
Vol 62 (20) ◽  
pp. 2536-2538 ◽  
Author(s):  
John C. Zolper ◽  
Albert G. Baca ◽  
Scott A. Chalmers
Keyword(s):  
Thermally Stable ◽  
Stable Oxygen

Low-Lanthanide-Content CeO2/MgO Catalysts with Outstandingly Stable Oxygen Storage Capacities: An In-Depth Structural Characterization by Advanced STEM Techniques

ChemCatChem ◽  
2015 ◽  
Vol 7 (22) ◽  
pp. 3763-3778 ◽  
Author(s):  
Miguel Tinoco ◽  
Juan J. Sanchez ◽  
María P. Yeste ◽  
Miguel Lopez-Haro ◽  
Susana Trasobares ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Oxygen Storage ◽  
Stable Oxygen ◽  
Lanthanide Content

Preparation and Oxygen Intake/Release Characteristics of YBaCo2Fe2O7

2011 ◽  
Vol 306-307 ◽  
pp. 1520-1523
Author(s):  
Su Mei Zhang ◽  
Hong Zhang Song ◽  
Xin Hong Su ◽  
Jian Feng Jia ◽  
De Lin Yang ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Room Temperature ◽  
Raw Materials ◽  
The Other ◽  
Oxygen Storage ◽  
Partial Substitution ◽  
Oxygen Intake ◽  
Original Mass ◽  
Stable Oxygen ◽  
Lower Temperature

A novel compound YBaCo2Fe2O7 was synthesized successfully under low surrounding oxygen partial pressure by selecting raw materials Fe2O3 and Fe to fix the oxygen content to “O7” in YBaCo2Fe2O7. Its oxygen intake/release characteristics were investigated by the thermogravimetric (TG) analysis from room temperature to 1150°C. The YBaCo2Fe2O7 sample exhibits a weak oxygen intake capability at lower temperature 360°C. On the other hand, the oxygen intake/release cycles of YBaCo2Fe2O7 were investigated between 340°C and 410°C. The experimental results show that it has good and stable oxygen intake/release reproducibility, and that its mass change of oxygen reaches 0.6% of its original mass within 40 minutes. However, after partial substitution, the oxygen storage capability of YBaCo2Fe2O7 is worse than YBaCo4O7. The previous results mean that YBaCo2Fe2O7 is not enough as a novel candidate for oxygen storage or separation materials.

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.

Preparation of ceria-zirconia solid solution with enhanced oxygen storage capacity and redox performance

2010 ◽  
Vol 4 (2) ◽  
pp. 164-171 ◽  
Author(s):  
Lijing Meng ◽  
Licheng Liu ◽  
Xuehong Zi ◽  
Hongxing Dai ◽  
Zhen Zhao ◽  
...  
Keyword(s):  
Solid Solution ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage
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