Decomposition equilibria for calcium and magnesium sulphates

Dewing, E. W.; Richardson, F. D.

doi:10.1039/tf9595500611

Cited by 34 publications

(14 citation statements)

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“…{--PZso 3 [14] If fully catalyzed, the different species are related by the equilibrium constant On the basis of Eq. [14] and [15], Eq. [13] becomes…”

Section: Resultsmentioning

confidence: 99%

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Use of the Junction Between Two Solid Electrolytes for the Potentiometric Measurement of Gaseous Oxides

Bélanger¹,

Gauthier²,

Fauteux³

1984

J. Electrochem. Soc.

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The contact between two solid electrolytes such as a stabilized zirconia and potassium sulfate can be used to measure the activity of volatile oxides, SO2 or SO~ for instance. On this basis, a new type of sensor has been designed which produces stable voltages logarithmically dependent on the concentration of the gas to be measured. This principle was extended to the measurement of other gaseous oxides, namely carbon oxides, using K2CO~ as the electrolyte. The range of these sensors covers a few parts per million to several thousand parts per million and their operating temperature varies from 600 ~ to 900~

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“…{--PZso 3 [14] If fully catalyzed, the different species are related by the equilibrium constant On the basis of Eq. [14] and [15], Eq. [13] becomes…”

Section: Resultsmentioning

confidence: 99%

“…This expression is identical in all aspects to the one derived for sensors with metallic electrodes (7). Relations [16] and [16a] are valid only if the gases reaching the junction have been suitably catalyzed to ~espect relation [15].…”

Section: Rt Rt E = C + ~ In (P~so] ~ + ~ In P~o~mentioning

confidence: 99%

Use of the Junction Between Two Solid Electrolytes for the Potentiometric Measurement of Gaseous Oxides

Bélanger¹,

Gauthier²,

Fauteux³

1984

J. Electrochem. Soc.

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“…The two peaks are accompanied by weight loss of 8.60% and 1.77%, respectively. Although the gel was already pretreated at 900 o C, it was found that magnesium sulfate could not be discomposed completely at 900 o C in this system, because decomposition temperature of magnesium sulfate was reported to be 1010 o ±10 o C. 11 The TG data shows a little weight loss when the temperature was higher than 1124 o C and the weight became constant at temperatures higher than 1200 o C. It was assumed that the exothermic peak at 1124 o C indicated the decomposition of the rest magnesium sulfate and at the same time some structural changes prior to -cordierite formation, which can be confirmed by X-ray diffraction analysis. In addition, it was presumed that the endothermic peak at 1210 o C corresponded to the formation of some liquid phase.…”

Section: Phase Transformations Of the Gel Using Tga/dscmentioning

confidence: 92%

“…11,12 This indicates that Si-O-M (M = Al, Mg) bonds were not formed in the dried gel. Thus, it can be supposed that Si-O-Si chains were formed during gelation, and hydrated aluminium and magnesium ions remained incorporated between these chains.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Synthesis of Cordierite Powder from Blast Furnace Slag

Lü

et al. 2013

Transactions of the Indian Ceramic Society

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We report a new process of synthesizing cordierite powder from blast furnace (BF) slag developed by using sol-gel route. The phase transformation of dried gel calcined under different temperatures was investigated by XRD and FTIR. It was found that one complicated silicic acid-sulphuric solutions system containing cations of Al 3+ and Mg 2+ was formed as the precursor of the cordierite by acid treatment of the slag. Cordierite powders with -cordierite as the main crystalline phase can be obtained when dried gel was calcined in the 1200 o -1300 o C temperature range. A viable technology to recover the major constituents from BF slag was provided.

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“…TG and DTA can be used to measure the equilibrium dissociation temperature Ta as a function of PB [34], from which AH and /kS are calculated. The method involves heating AB(s) in an atmosphere with a known value ofPB.…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Thermal analysis in reactive atmospheres

Gimzewski

1988

Journal of Thermal Analysis

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By using reactive atmospheres, the area of aplb]ication of thermal analysis is expanded considerably to cover many aspects of high temperature research into fuels, extractive metallurgy, materials and catalysts. This article reviews the design of apparatus and its application in kinetic and thermodynamic studies involving atmospheres such as H2, CO, N2, NH3, CO2, H20, SO2or3~ H2 S, $2. C12, HCI, F2 and HF at low or high pressures and as low pressure plasmas. Apart from gas-solid reactions, the important influence of a controlled product gas atmosphere on decomposition reactions is discussed also. Gas-solid adsorption and solubility studies are not included. John Wiley & Sons, Limited, ChichesterAkaddmiai Kiad6, Budapest GIMZEWSKI: ANALYSIS IN REACTIVE ATMOSPHERESTable I Areas of application of thermal analysis using reactive atmospheres ATMOSPHERE APPLICATIONS 02 H2, CO N2, NH3, NO2 C02 H20 802 or3 H2S 02, HCI etc F2, HF etc Plasmas Combustion, extractive metallurgy, oxidation stability tests, carbon analysis. Extractive metallurgy, coal hidrogenation, catalysts, materials science, hydrogen storage. Nitriding using N 2 or NH3, decomposition of catalysts, and propellants in NH3, extractive metallurgy using NO2.Exploitation and analysis of carbonate minerals, processing fuel gases, corrosion.Coal gasification, materials science, reversible dehydration reaction analysis of plaster.Cleaning combustion gases, extractive metallurgy.Cleaning fuel gases, corrosion.Extractive metallurgy, analysis of ceramics.Nuclear fuel processing. Materials science Experimental ApparatusThermal analysis has been performed in gases and vapours at low and high pressures and in low pressure plasmas. Plasmas and vapours pose specific problems discussed below, but otherwise the apparatus design is dictated by the corrosive nature of the atmosphere, its pressure and its flow arrangement. A flowing atmosphere is preferred at normal and high pressures to facilitate mass transfer but at low pressures the atmosphere is usually static. Below, corrosion problems are discussed for furnaces, thermocouples and thermobalances, and the difficulties in generating and using controlled atmospheres are considered separately for gases, vapours and plasmas.s ThermalAnal. 33, 1988

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Decomposition equilibria for calcium and magnesium sulphates

Cited by 34 publications

References 0 publications

Use of the Junction Between Two Solid Electrolytes for the Potentiometric Measurement of Gaseous Oxides

Use of the Junction Between Two Solid Electrolytes for the Potentiometric Measurement of Gaseous Oxides

Synthesis of Cordierite Powder from Blast Furnace Slag

Thermal analysis in reactive atmospheres

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