Technical Note:Breakdown of Passivity on Pure Nickel by Sulfate Ion in High Temperature Aqueous Solution

CORROSION ◽  
1985 ◽  
Vol 41 (3) ◽  
pp. 177-179 ◽  
Author(s):  
Toshio Shibata ◽  
Shinji Fujimoto
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Pure Nickel ◽  
Sulfate Ion

Octahedral–tetrahedral equilibria in aqueous cobalt(II) solutions at high temperatures

1980 ◽  
Vol 58 (14) ◽  
pp. 1418-1426 ◽  
Author(s):  
Thomas Wilson Swaddle ◽  
Leonard Fabes
Keyword(s):  
Sulfuric Acid ◽  
High Temperature ◽  
Absorption Band ◽  
High Temperatures ◽  
Intensity Ratio ◽  
Hydrogen Sulfate ◽  
Sulfate Ion ◽  
Acidic Media ◽  
Visible Absorption ◽  
Upper Limits

Evidence is presented to indicate that aqueous Co2+ exists as the hexaaquo-ion in equilibrium with minor amounts (upper limits 0.08% at 298 K, 7% at 625 K, at 16–25 MPa) of tetraaquocobalt(II), with ΔH ~ +17 kJ mol−1. The single visible absorption band of the supposed Co(H2O)42+ has maxima at 552 nm and 486 nm in the intensity ratio 2:1. Hydrogen sulfate ion (up to 0.5 M at least) does not complex Co2+(aq) detectably in acidic media, 290–625 K, and sulfuric acid therefore holds promise as a non-complexing strong monobasic acid for high-temperature aqueous studies. In water containing 2.0 M or more Cl−, the tetrahedral form of cobalt(II) is CoCl42−, ΔH for the octahedral → tetrahedral equilibrium being +62 kJ mol−1; forCoBr42−, the corresponding ΔH is +70 kJ mol−1, the greater endothermicity accounting entirely for the lower stability relative to CoCl42−.

Removal of Anionic Metalloid/Metals by PEI-Modified Corynebacterium glutamicum

2013 ◽  
Vol 825 ◽  
pp. 568-571
Author(s):  
Namgyu Kim ◽  
Munsik Park ◽  
Jongmoon Park ◽  
Donghee Park
Keyword(s):  
Aqueous Solution ◽  
Binding Site ◽  
Corynebacterium Glutamicum ◽  
Adsorption Mechanism ◽  
Competitive Inhibition ◽  
Aqueous System ◽  
Reduction Mechanism ◽  
Removal Mechanism ◽  
Sulfate Ion ◽  
Industrial Fermentation

An anionic biosorbent was derived from an industrial fermentation biowate, Corynebacterium glutamicum, by being cross-linked with polyethylenimine (PEI). A fiber form of the biosorbent was used to examine its potentiality of removing anionic metals such as As (V), Cr (VI) and Mn (VII) in aqueous system. As (V) and Cr (VI) were efficiently removed by the biosorbent through anionic adsorption mechanism. Sulfate ion seriously inhibited adsorption of the anionic metals through competitive inhibition with respect to the binding site of the biosorbent. In the case of Mn (VII), its removal mechanism by the biosorbent was not anionic adsorption. Mn (VII) was completely removed in aqueous phase, meanwhile, Mn (II) appeared and increased in proportion to the Mn (VII) depletion. As a result, adsorption coupled reduction was chosen as the mechanism of Mn (VII) removal by the biosorbent. In conclusion, the anionic biosorbent could be used to remove various anionic metals from aqueous solution through anionic adsorption or reduction mechanism.

Structure and water exchange of the hydrated thiosulfate ion in aqueous solution using QMCF MD simulation and large angle X-ray scattering

2014 ◽  
Vol 43 (33) ◽  
pp. 12711-12720 ◽  
Author(s):  
Lars Eklund ◽  
Tomas S. Hofer ◽  
Alexander K. H. Weiss ◽  
Andreas O. Tirler ◽  
Ingmar Persson
Keyword(s):  
Aqueous Solution ◽  
Sulfur Atom ◽  
Md Simulation ◽  
Water Exchange ◽  
Large Angle ◽  
Sulfate Ion ◽  
Simulation Data ◽  
X Ray ◽  
X Ray Scattering ◽  
Hydration Structure

Experimental and simulation data of the thiosulfate ion show large similarities in hydration structure and mechanism with the sulfate ion but with weaker hydration of the terminal sulfur atom in thiosulfate.

Kinetic modeling of high-temperature oxidation of pure nickel

2019 ◽  
Vol 341 ◽  
pp. 115018 ◽  
Author(s):  
Fangzhou Xing ◽  
Na Ta ◽  
Jing Zhong ◽  
Yu Zhong ◽  
Lijun Zhang
Keyword(s):  
High Temperature ◽  
Kinetic Modeling ◽  
High Temperature Oxidation ◽  
Pure Nickel ◽  
Temperature Oxidation

Surface Analysis of a Nano-Sized Oxide Formed on Alloy 600 in a High Temperature/Pressure Aqueous Solution

2010 ◽  
Vol 10 (1) ◽  
pp. 85-91 ◽  
Author(s):  
Dong-Jin Kim ◽  
Yun Soo Lim ◽  
Hyuk Chul Kwon ◽  
Seong Sik Hwang ◽  
Hong Pyo Kim
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Surface Analysis ◽  
Alloy 600

Dry matter intake and rumen fermentation in steers fed untreated grass hay or hay treated with urea, sodium hydroxide or a combination of both

1990 ◽  
Vol 1990 ◽  
pp. 114-114
Author(s):  
A. P. Moloney ◽  
A. V. Flynn
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Sodium Hydroxide ◽  
Dry Matter ◽  
Nutritive Value ◽  
Poor Quality ◽  
Rumen Fermentation ◽  
Dry Matter Intake ◽  
Test Material ◽  
Grass Hay

Treatment of poor quality roughages with ammonia or sodium hydroxide (NaOH) has been demonstrated in numerous studies to improve the nutritive value of these materials. Ammonia is usually applied in anhydrous or aqueous forms in stacks at ambient temperature or anhydrous in high temperature ovens (e.g. Mason et al., 1989) while NaOH is usually applied as an aqueous solution either as a spray or by immersion of the test material (e.g. Wanapat et al., 1985). The objective of this study was to determine the effects on composition and subsequent rumen fermentation when low digestibility grass hay was treated with ammonia and/or NaOH by a procedure which might be readily used at farm level.

scholarly journals The Prospects for Processing Reservoir Oil Sludge into Hydrocarbons by Low-Temperature Hydrogenation in Sorbing Electrochemical Matrices in Comparison with Conventional High-Temperature Hydrocracking

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5362
Author(s):  
Anton Maximov ◽  
Aslan Tsivadze ◽  
Alexander Fridman ◽  
Tatyana Kuchinskaya ◽  
Alexander Novikov ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Low Temperature ◽  
Transition Metals ◽  
Mesoporous Structure ◽  
Oil Sludge ◽  
Commercial Catalyst ◽  
Low Viscosity ◽  
Yield Of Light Fractions

In this paper, we developed an effective method for purifying oil sludge using a sorbing electrochemical matrix and assessed the prospects of this method in comparison with conventional hydrocracking. We synthesized Ni-W supported hydrocracking catalysts with different morphology and studied their activity under various conditions, we compared the obtained catalysts with commercial catalyst SGK-5. We demonstrated that the introduction of a secondary mesoporous structure in the catalyst leads to an increase in the yield of light fractions to 52 wt.%. The possibility is demonstrated to obtain hydrocarbons from reservoir oil sludge, dispersed into an aqueous solution of detergent, by the method of low-temperature hydrogenation in sorbing electrochemical matrices. The obtained product was characterized by low viscosity, low content of transition metals (<320 ppm), and sulphur (<260 ppm).

scholarly journals A TiO2 Semiconductor pH Sensor for High-Temperature-High-Pressure Aqueous Solution Use

1985 ◽  
Vol 34 (2) ◽  
pp. 132-134
Author(s):  
Nobuyoshi Hara ◽  
Kazuhiro Nakajima ◽  
Katsuhisa Sugimoto
Keyword(s):  
Aqueous Solution ◽  
High Pressure ◽  
High Temperature ◽  
Ph Sensor ◽  
High Temperature High Pressure
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