The reactions of metal sulphides with molten potassium nitrate

1975 ◽  
Vol 28 (9) ◽  
pp. 2073 ◽  
Author(s):  
BJ Meehan ◽  
SA Tariq
Keyword(s):  
Metal Oxides ◽  
Metal Cations ◽  
Potassium Nitrate ◽  
Oxides Of Nitrogen ◽  
Acid Base ◽  
Oxidation Reduction ◽  
Cu And Zn

The reactions of TiS2, VS, Cr2S3, MnS, FeS, CoS, NiS, CuS and ZnS with molten potassium nitrate were studied. In the melt, Ti, Ni, Cu and Zn metal cations exhibited acid-base reactions and were precipitated as metal oxides whereas V, Cr, Mn, Fe and Co metal cations showed oxidation-reduction as well as acid-base reactions and were converted into VO3-, CrO42-, MnO2, Fe2O3 and Co3O4 respectively. The sulphide sulphur in all cases was oxidized to sulphate and the nitrate melt was reduced to nitrite and oxides of nitrogen. The stoichiometries of these reactions have been established.

Solvation and redox properties of [Co(en)3]3+-[Co(en)3]2+ system

1980 ◽  
Vol 45 (2) ◽  
pp. 335-338 ◽  
Author(s):  
Adéla Kotočová ◽  
Ulrich Mayer
Keyword(s):  
Hydrogen Bond ◽  
Lewis Acid ◽  
Specific Interaction ◽  
Redox Properties ◽  
Solvation Effect ◽  
Interacting Particles ◽  
Acid Base ◽  
Polar Solvents ◽  
Oxidation Reduction ◽  
Solvent Molecules

The solvation effect of a number of nonaqueous polar solvents was studied on the oxidation-reduction properties of the [Co(en)3]3+-[Co(en)3]2+ system. Interactions of these ions with the solvent molecules are discussed in terms of their coordination, which is accompanied by a specific interaction of the Lewis acid-base type, namely formation of a hydrogen bond between the interacting particles. This is the main controlling factor of the redox properties of the studied system.

Ti/TiO2, Au Electrodes Prepared by Plasma Electrolytic Oxidation and Electron Beam Evaporation

2018 ◽  
Vol 386 ◽  
pp. 326-331 ◽  
Author(s):  
Marina S. Vasilyeva ◽  
Vladimir S. Rudnev ◽  
E.S. Zykova ◽  
Alexander Yu. Ustinov ◽  
Ksenia A. Sergeeva ◽  
...  
Keyword(s):  
Electron Beam ◽  
Plasma Electrolytic Oxidation ◽  
Electron Beam Evaporation ◽  
Glass Electrode ◽  
Excellent Performance ◽  
Acid Base ◽  
Oxidation Reduction ◽  
Electrolytic Oxidation ◽  
Different Types ◽  
Plasma Electrolytic

Ti/TiO2,Au electrodes were prepared via plasma electrolytic oxidation (PEO) of Ti plate, followed by deposition of a thin (10 nm) Au layer by electron beam evaporation (EBE). The electrodes obtained were used for potentiometric indication of different types of chemical reactions. Ti/TiO2,Au electrodes showed an excellent performance for end point indication in the oxidation-reduction and complexometric titrations similar to the traditional Pt and in the acid-base titration similar to glass electrode.

Atomic Bonding at Oxide Surfaces

1994 ◽  
Vol 357 ◽  
Author(s):  
Victor E. Henrich
Keyword(s):  
Point Defects ◽  
Surface Defects ◽  
Oxide Surfaces ◽  
Surface Point ◽  
Acid Base ◽  
Metal Oxide Surfaces ◽  
Oxidation Reduction ◽  
Defect Sites ◽  
Metal Ceramic ◽  
Ceramic Interfaces

AbstractThe fundamental interactions involved in the bonding of atoms and molecules to metal oxides are discussed. Surface defects play a major role in many of those interactions. Both acid/base and oxidation/reduction reactions occur at metal-oxide surfaces, with the latter dominating at point defect sites. The reaction of metals with oxide surfaces is governed largely by the relative heats of formation of the respective oxides, although surface point defects also play an important role. Preliminary studies of ceramic/ceramic interfaces indicate that interfacial interactions are much weaker than for metal/ceramic interfaces.

Simultaneous removal of dyes and metal cations using an acid, acid-base and base modified vermiculite as a sustainable and recyclable adsorbent

2017 ◽  
Vol 576 ◽  
pp. 398-408 ◽  
Author(s):  
Wojciech Stawiński ◽  
Agnieszka Węgrzyn ◽  
Olga Freitas ◽  
Lucjan Chmielarz ◽  
Grzegorz Mordarski ◽  
...  
Keyword(s):  
Metal Cations ◽  
Simultaneous Removal ◽  
Acid Base ◽  
Acid Acid ◽  
Recyclable Adsorbent

Study of PET Depolymerization Catalyzed by Metal Oxide with Different Acidity/Basicity under Microwave Irradiation

2011 ◽  
Vol 233-235 ◽  
pp. 1076-1079 ◽  
Author(s):  
Yu Zhen Ge ◽  
Chun Hua Han ◽  
Dong Zhang
Keyword(s):  
Alkali Metal ◽  
Microwave Irradiation ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Catalytic Effect ◽  
Acid Base ◽  
Alkali Metal Oxide ◽  
Scale Method

In this paper, the PET depolymerization catalyzed by metal oxides (MgO, CdO, Cu2O,Sb2O3, MnO2, V2O5, SiO2,MoO3) under microwave irradiation were investigated, and the effects of acid-base on PET depolymerization was studied by acid-base scale method. The results indicated that the stronger the acidity or basicity of metal oxide was, the better the effects of catalytic depolymerization of PET appeared. Compared with alkali metal oxide, the catalytic effect of acid metal oxide to PET depolymerization was better.

Characterization of the surface acid-base properties of metal oxides by titration/displacement reactions

1986 ◽  
Vol 90 (17) ◽  
pp. 4067-4075 ◽  
Author(s):  
R. N. Spitz ◽  
J. E. Barton ◽  
M. A. Barteau ◽  
R. H. Staley ◽  
A. W. Sleight
Keyword(s):  
Metal Oxides ◽  
Acid Base ◽  
Displacement Reactions ◽  
Base Properties
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