scholarly journals Structural, physical and chemical properties of nanostructured nickel-substituted ceria oxides under reducing and oxidizing conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64861-64870 ◽  
Author(s):  
R. O. Fuentes ◽  
L. M. Acuña ◽  
C. A. Albornoz ◽  
A. G. Leyva ◽  
N. Sousa ◽  
...  
Keyword(s):  
High Temperature ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
Thermochemical Stability ◽  
And Chemical Properties

Nanocrystalline Ni-substituted ceria is highly reversible and it has an extraordinary redox cyclicality associated to a high thermochemical stability of the material at relatively high temperature.

Influence of Regeneration Condition on Physical and Chemical Properties of High Temperature Coal Gas Desulfurization Sorbent

2014 ◽  
Vol 521 ◽  
pp. 658-661
Author(s):  
Lei Yang ◽  
Shang Guan Ju ◽  
Yu Kun Gao ◽  
Yan Hui Hu
Keyword(s):  
High Temperature ◽  
Circulatory System ◽  
Chemical Properties ◽  
Space Velocity ◽  
Physical And Chemical Properties ◽  
Coal Gas ◽  
Regeneration Condition ◽  
Atmosphere Temperature ◽  
Physical And Chemical ◽  
And Chemical Properties

Physical and chemical properties are closely related to desulfurization, regeneration performance and cycle stability for high temperature coal gas desulfurizer. This review focuses on influence rules of changes in regeneration atmosphere, temperature and space velocity on physical and chemical properties. A large number of experimental researches have shown that regeneration atmosphere, regeneration temperature, space velocity have an important influence on mechanical strength, active component and texture change for high temperature coal gas desulfurizer. The different regeneration atmosphere obviously results in different active ingredients for desulfurization sorbent after regeneration, and regeneration at a higher regeneration temperature will easily cause desulfurizer sintering, as well as small regeneration space velocity can lead to the formation of sulfates. In order to make the circulatory system of sulfidation-regeneration-sulfidation need to the requirements in industrial application, the further research of influence rules of regeneration condition on physical and chemical properties will be crucial.

An Instrument Established for the High Temperature Measurement of Ultraviolet-Visible Absorption Spectra of Molten Fluoride Salt Behaving As Coolant in the Molten Salt Reactor

2018 ◽  
Author(s):  
Hongtao Liu ◽  
Yiyang Liu ◽  
Tao Su
Keyword(s):  
High Temperature ◽  
Molten Salts ◽  
Room Temperature ◽  
Chemical Properties ◽  
Molten Salt Reactor ◽  
Physical And Chemical Properties ◽  
Molten Fluoride ◽  
Fluoride Salts ◽  
Physical And Chemical ◽  
And Chemical Properties

Molten salts were widely used in nuclear and solar power field due to the excellent heat transfer and storage. Molten fluoride salts were selected as primary and secondary coolants in the Molten Salt Reactor Experiment (MSRE) developed by Oak Ridge National Laboratory (ORNL). Therefore, it is dramatically important to study the physical and chemical properties of molten fluoride salts that impact on the design of reactor core and thermohydraulics. The molecular structure directly determines the physical and chemical properties of matter, so it is also essential to study the structure of molten salts. Spectroscopy has been proven to be a very useful tool for investigating molten salts structures. However, the standard instrument is inapplicable for measurement of the high temperature molten salts, especially for molten fluoride salts. To obtain the ultraviolet-visible (UV-Vis) absorption spectra of molten salts at high temperature, an instrument was designed to study the structures of molten salts in situ. The instrument is mainly composed of a vertical pit furnace connecting with a glovebox and an assembled cuvette which can operate from room temperature up to 800°C. The assembled cuvette is made of Hastelloy C/N as the main body with a reverse ‘T’ contour and diamond or crystalline CaF2 etc. as the window plates, so it can withstand the corrosion produced by the sample and allow the interest light passing through. The effective spectral range of this instrument is from 200 to 1000 nm. Performances of the instrument are testified by spectral studies on water under room temperature and molten salts under high temperature.

Preparation and Characterization of Nanostructured FeS2 and CoS2 for High-Temperature Batteries

2002 ◽  
Vol 730 ◽  
Author(s):  
Ronald A. Guidotti ◽  
Frederick W. Reinhardt ◽  
Jinxiang Dai ◽  
David E. Reisner
Keyword(s):  
High Temperature ◽  
Single Cells ◽  
Scale Up ◽  
Chemical Properties ◽  
Plant Size ◽  
Physical And Chemical Properties ◽  
Commercial Source ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractIn this paper, we report on the preparation of synthetic FeS2 and CoS2 using a relatively inexpensive aqueous process. This avoids the material and handling difficulties associated with a high-temperature approach. An aqueous approach also allows ready scale-up to a pilot-plant size facility. The FeS2 and CoS2 were characterized with respect to their physical and chemical properties. The synthetic disulfides were incorporated into catholyte mixes for testing in single cells and batteries over a range of temperatures. The results of these tests are presented and compared to the performance of natural FeS2 (pyrite) and a commercial source of CoS2.

Towards a unified model for granite genesis

2004 ◽  
Vol 95 (1-2) ◽  
pp. 1-10 ◽  
Author(s):  
B. W. Chappell
Keyword(s):  
High Temperature ◽  
Partial Melting ◽  
Chemical Properties ◽  
Fractional Crystallisation ◽  
Physical And Chemical Properties ◽  
Molten State ◽  
Granite Magma ◽  
Physical And Chemical ◽  
Pelitic Rocks ◽  
And Chemical Properties

ABSTRACTMost granites result from partial melting within the crust. Granite melts produced at the lowest temperatures of partial melting mainly comprise close to equal amounts of the haplogranite components Qz, Ab and Or, with H2O. Many felsic granites were formed by partial melting under such conditions and are low-temperature types, with crystals of zircon and other restite minerals present in the initial magma. Such magmas evolve in composition, at least initially, through fractionation of that restite. If one of the four haplogranite components either becomes depleted or too low in amount to contribute further to the melt, then melting may proceed to higher temperatures without a contribution from that component. Melting will advance to significantly higher temperatures if there is a critical deficiency in one or more components and a high-temperature granite magma forms, in which zircon is completely soluble. Such magmas are extracted from the source in a completely molten state and may evolve by fractional crystallisation. They are monzonitic, tonalitic or A-type, depending on whether the critical deficiency occurred in the Qz, Or or H2O component. If the Ab component is critically deficient, as in pelitic rocks, the rocks may be infertile for granite production. The control that source rock compositions exert on both the physical and chemical properties of granite magmas provides a unifying element in granite gen

scholarly journals Experimental Investigation on a Novel Particle Polymer for Enhanced Oil Recovery in High Temperature and High Salinity Reservoirs

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Yang Liu ◽  
Jian Zhang ◽  
Xingcai Wu ◽  
Xiaodong Kang ◽  
Baoshan Guan ◽  
...  
Keyword(s):  
High Temperature ◽  
High Salinity ◽  
Chemical Properties ◽  
Polymer Flooding ◽  
Physical And Chemical Properties ◽  
Excellent Thermal Stability ◽  
Oil Displacement ◽  
Profile Control ◽  
Physical And Chemical ◽  
And Chemical Properties

Conventional polymer flooding include polymer flooding, surfactant-polymer flooding (SP), alkaline-surfactant-polymer flooding (ASP), and crosslinked polymer gel flooding. However, these technologies in oilfield, especially in high temperature and high salinity, are limited due to the poor ability of temperature and salinity resistance of polymer. In this work, a novel polymer particle (soft microgel, SMG) is used as the research object under the reservoir condition of high salinity (20 × 104 mg/L) to evaluate the physical and chemical properties of submillimeter-scale SMG and the effect of profile control and oil displacement. The investigation of the physical and chemical properties of submillimeter-scale SMG shows that it has the characteristics of low viscosity, easy injection, good plugging property, swelling property, rheological property, and excellent thermal stability. After 6 months of high temperature and high salinity aging, there is no hydration and hydrolysis of submillimeter-scale SMG as the traditional polymers under high temperature and high salinity. The parallel two-core flooding experiments indicate that the submillimeter-scale SMG has a better effect of profile control and oil displacement, which increases the fraction flow rate( f w ) of low-permeability core from 5.12% before SMG-flooding to 85.29% and the total increase of recovery as high as 14.07%. The comprehensive analysis demonstrates that the submillimeter-scale SMG has the potential to solve the problem that the polymer flooding cannot be applied to the high temperature and high salinity reservoir, and it is also expected to improve the uneven waterflooding in the reservoir.

Analysis of Physical and Chemical Properties of XLPE Insulation for Long Term Running Cable

2018 ◽  
Vol 922 ◽  
pp. 186-191
Author(s):  
Tao Zhang ◽  
Shi Chao Nie ◽  
Ze Hua Pan ◽  
Zhi Wei Li ◽  
Nai Kui Gao ◽  
...  
Keyword(s):  
Mechanical Property ◽  
High Temperature ◽  
Chemical Properties ◽  
Insulation Material ◽  
Physical And Chemical Properties ◽  
Term Operation ◽  
Physical And Chemical ◽  
Xlpe Insulation ◽  
And Chemical Properties

High temperature caused by copper core would have a certain impact on the performance of XLPE insulation during the long running process of the cable. In this paper, the XLPE/PVC cable running for 17years was investigated by using thermal analysis, microstructure analysis, mechanical property analysis and dielectric properties analysis. The influences of long-term operation for the physical and chemical properties of cable insulation are analyzed by the performance of the insulation material. DSC results indicated that position of shoulder peak would characterize the thermal history of material and express the crystal size distribution of XLPE indirectly. Mechanical property test results showed that effect of long term high temperature would decrease the elongation at break and breaking strength of XLPE. SEM results showed that the effect of long term high temperature increased the average size of crystal and the distribution of the crystal became concentrated, meanwhile it verified the relevant conclusion of DSC.

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