Nanocrystalline Mixed Metal Oxides – Novel Oxygen Storage Materials

2003 ◽  
Vol 788 ◽  
Author(s):  
Harry Sarkas ◽  
Patrick G. Murray ◽  
Aaron Fay ◽  
R. W. Brotzman
Keyword(s):  
Particle Size ◽  
Rare Earth ◽  
Storage Capacity ◽  
Rare Earth Oxide ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Nanocrystalline Particle ◽  
Oxygen Storage Material ◽  
The Mean ◽  
Thermal Stability Of

ABSTRACTNanophase Technologies Corporation (NTC) employs a new physical vapor synthesis technique to manufacture ceria-based mixed rare earth oxide nanomaterials. The mixed rare earth oxide nanoparticles are nonporous, dense, discrete crystals. The compositions are solid solutions that remain thermally stable to above 1050°C.Ceria is an active oxygen storage material. Doping ceria with other rare earth metals enhances the thermal stability of nanocrystalline particle size and increases the oxygen storage capacity (OSC). The mean particle size and OSC of ceria-based mixed rare earth oxides are presented as a function of particle composition, morphology, and thermal history.These materials are commercially available and are being engineered for several applications including oxygen storage catalysts and polishing materials.

The interplay between ceria particle size, reducibility, and ethanol oxidation activity of ceria-supported gold catalysts

2018 ◽  
Vol 3 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Gregory M. Mullen ◽  
Edward J. Evans ◽  
Benjamin C. Siegert ◽  
Nathan R. Miller ◽  
Benjamin K. Rosselet ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Ethanol Oxidation ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Oxidation Activity ◽  
Supported Gold Catalysts ◽  
Supported Gold ◽  
Ceria Particle

The size of ceria particles influenced the activity of Au/CeO2 catalysts for ethanol oxidation, demonstrating a linear correlation between oxygen storage capacity and catalytic activity.

Overview: Modification of Cerium Oxide in Three-Way Catalysts

2014 ◽  
Vol 575 ◽  
pp. 97-102 ◽  
Author(s):  
M. Nazri Abu Shah ◽  
S. Hanim Md Nor ◽  
Kamariah Noor Ismail ◽  
Abdul Hadi
Keyword(s):  
Thermal Stability ◽  
Rare Earth ◽  
Metal Oxides ◽  
Cerium Oxide ◽  
Storage Capacity ◽  
Rare Earth Metals ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Alkaline Metals ◽  
Three Way Catalyst

An overview of modification of cerium oxide, CeO2which is employed in the three-way catalyst (TWCs) is presented in this article. The modifications of cerium oxide, CeO2incorporated with the metal oxides for the improvement of thermal stability, microstructure and oxygen storage capacity (OSC) are discussed. In view of that, the types of metal oxide are grouped into transition metals, rare earth metals, and alkaline metals and the effect of each group into cerium oxide, CeO2are elaborated.

Body oxygen stores, aerobic dive limits and diving behaviour of the star-nosed mole (Condylura cristata) and comparisons with non-aquatic talpids

2002 ◽  
Vol 205 (1) ◽  
pp. 45-54
Author(s):  
Ian W. McIntyre ◽  
Kevin L. Campbell ◽  
Robert A. MacArthur
Keyword(s):  
Skeletal Muscles ◽  
Storage Capacity ◽  
Metabolic Cost ◽  
Oxygen Storage Capacity ◽  
Dive Duration ◽  
Oxygen Storage ◽  
High Mass ◽  
The Mean ◽  
Total Body ◽  
Condylura Cristata

SUMMARY The dive performance, oxygen storage capacity and partitioning of body oxygen reserves of one of the world’s smallest mammalian divers, the star-nosed mole Condylura cristata, were investigated. On the basis of 722 voluntary dives recorded from 18 captive star-nosed moles, the mean dive duration (9.2±0.2 s; mean ± s.e.m.) and maximum recorded dive time (47 s) of this insectivore were comparable with those of several substantially larger semi-aquatic endotherms. Total body O2 stores of adult star-nosed moles (34.0 ml kg–1) were 16.4 % higher than for similarly sized, strictly fossorial coast moles Scapanus orarius (29.2 ml kg–1), with the greatest differences observed in lung and muscle O2 storage capacity. The mean lung volume of C. cristata (8.09 ml 100 g–1) was 1.81 times the predicted allometric value and exceeded that of coast moles by 65.4 % (P=0.0001). The overall mean myoglobin (Mb) concentration of skeletal muscles of adult star-nosed moles (13.57±0.40 mg g–1 wet tissue, N=7) was 19.5 % higher than for coast moles (11.36±0.34 mg g–1 wet tissue, N=10; P=0.0008) and 54.2 % higher than for American shrew-moles Neurotrichus gibbsii (8.8 mg g–1 wet tissue; N=2). The mean skeletal muscle Mb content of adult star-nosed moles was 91.1 % higher than for juveniles of this species (P<0.0001). On the basis of an average diving metabolic rate of 5.38±0.35 ml O2 g–1 h–1 (N=11), the calculated aerobic dive limit (ADL) of star-nosed moles was 22.8 s for adults and 20.7 s for juveniles. Only 2.9 % of voluntary dives by adult and juvenile star-nosed moles exceeded their respective calculated ADLs, suggesting that star-nosed moles rarely exploit anaerobic metabolism while diving, a conclusion supported by the low buffering capacity of their skeletal muscles. We suggest that a high mass-specific O2 storage capacity and relatively low metabolic cost of submergence are key contributors to the impressive dive performance of these diminutive insectivores.

scholarly journals CO2 Methanation on Supported Rh Nanoparticles: The combined Effect of Support Oxygen Storage Capacity and Rh Particle Size

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 944 ◽  
Author(s):  
Georgia Botzolaki ◽  
Grammatiki Goula ◽  
Anatoli Rontogianni ◽  
Ersi Nikolaraki ◽  
Nikolaos Chalmpes ◽  
...  
Keyword(s):  
Particle Size ◽  
Rational Design ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Catalyst Design ◽  
Oxygen Storage ◽  
Design Parameters ◽  
Co2 Methanation ◽  
Design And Optimization ◽  
Effect Of Support

CO2 hydrogenation toward methane, a reaction of high environmental and sustainable energy importance, was investigated at 200–600 °C and H2/CO2 = 4/1, over Rh nanoparticles dispersed on supports with different oxygen storage capacity characteristics (γ-Al2O3, alumina-ceria-zirconia, and ceria-zirconia). The effects of the support OSC and Rh particle size on reaction behavior under both integral and differential conditions were investigated, to elucidate the combined role of these crucial catalyst design parameters on methanation efficiency. A volcano-type variation of methanation turnover frequency was found in respect to support OSC; Rh/ACZ, with intermediate OSC, was the optimal catalyst. The structure sensitivity of the reaction was found to be a combined function of support OSC and Rh particle size: For Rh/γ-Al2O3 (lack of OSC) methanation was strongly favored on small particles—the opposite for Rh/CZ (high OSC). The findings are promising for rational design and optimization of CO2 methanation catalysts by tailoring the aforementioned characteristics.

Rational Synthesis Concept for Cerium Oxide Nanoparticles: On the Impact of Particle Size on the Oxygen Storage Capacity

2020 ◽  
Vol 124 (16) ◽  
pp. 8736-8748 ◽  
Author(s):  
Elifkübra Özkan ◽  
Pascal Cop ◽  
Felix Benfer ◽  
Alexander Hofmann ◽  
Martin Votsmeier ◽  
...  
Keyword(s):  
Particle Size ◽  
Cerium Oxide ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
The Impact

scholarly journals Oxygen storage capacity and thermal stability of the CuMnO2–CeO2 composite system

2015 ◽  
Vol 3 (24) ◽  
pp. 12958-12964 ◽  
Author(s):  
Xiubing Huang ◽  
Chengsheng Ni ◽  
Guixia Zhao ◽  
John T. S. Irvine
Keyword(s):  
Thermal Stability ◽  
Surface Modification ◽  
Oxygen Diffusion ◽  
Composite System ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
System P ◽  
Thermal Stability Of

Fast oxygen diffusion and improved oxygen storage capacity of crednerite CuMnO2 have been achieved at reduced temperatures by surface modification with CeO2.

Sign in / Sign up

Export Citation Format

Share Document