The System Na2O-SiO2-H2O at 50, 70 and 90°*

Baker, Caitlin; Jue, L. R.; Wills, John

doi:10.1021/ja01168a005

Cited by 17 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3Na₂O•2SiO₂•11H₂O, 25ºC, experiment (Sprauer and Pearce, 1940) Na₃HSiO₄•5H₂O, 50ºC, experiment (Baker et al, 1950) Na₃HSiO₄•2H₂O, 50ºC, experiment (Baker et al, 1950) and , based on the respective interaction parameters as a function of temperature from Wesolowski (1992). In addition, in the validation test (see the following section), model-predicted values are in satisfactory agreement with independent experimental values.…”

Section: Molality Of Naoh (M Naoh )mentioning

confidence: 60%

“…In combination with experimental data for Na 3 HSiO 4 ⋅5H 2 O at 50 °C, the temperature dependence of θ -OH, H2SiO 4 2-, (∂θ ij )/(∂T) P , is also evaluated (Table 3). In Figure 1, predicted solubilities of Na 3 HSiO 4 ⋅5H 2 O and Na 3 HSiO 4 ⋅2H 2 O at 50 °C are also compared with experimental data from Baker et al (1950). For Na 3 HSiO 4 ⋅5H 2 O, the model reasonably reproduces experimental data within a factor of ∼1.5, but at I ≈ 19.5 m, it is within a factor of ∼5.5.…”

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 70%

“…In addition, (∂θ ij )/(∂T) P for OH --H 2 SiO 4 2-interaction is evaluated from solubility data of Na 3 HSiO 4 ⋅5H 2 O and Na 3 HSiO 4 ⋅2H 2 O at elevated temperatures from Baker et al (1950) (Table 3).…”

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 99%

“…║ Evaluated from solubility data of 3Na 2 O•2SiO 2 •11H 2 O in NaOH solutions up to ~19 m from Sprauer and Pearce (1940). The temperature dependence of θ ij , (∂θ ij )/ (∂T) P , is evaluated from solubility data of Na 3 HSiO 4 •5H 2 O at 50 o C, and of Na 3 HSiO 4 •2H 2 O at 50, 70, and 90 o C in NaOH solutions up to ~24 m from Baker et al (1950).…”

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 99%

“…From the figure, it is clear that the model reproduces experimental data generally within a factor of ∼3. Baker et al (1950) (Table 4). In combination with experimental data for Na 3 HSiO 4 ⋅5H 2 O at 50 °C, the temperature dependence of θ -OH, H2SiO 4 2-, (∂θ ij )/(∂T) P , is also evaluated (Table 3).…”

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 99%

See 4 more Smart Citations

A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 C: Applications to zeolites

Xiong

2012

American Mineralogist

View full text Add to dashboard Cite

In this study, a thermodynamic model for silica and aluminum in high ionic strength solutions at elevated temperatures up to 100 °C is constructed. Pitzer equations are utilized for the thermodynamic model construction. This model is valid up to ionic strengths of ∼24 molal (m) in NaOH solutions with silicate concentrations up to ∼1.5 m. The speciation of silica (including monomers and polymers) and aluminum at elevated temperatures is taken into account. Also, the equilibrium constants for silicic acid and its polymer species (H 4 SiO 4 , H 5 Si 2 O 7 -, H 4 Si 2 O 7 2-, and H 5 Si 3 O 7 3-) at elevated temperatures up to 100 °C, are obtained based on theoretical calculations. Using this thermodynamic model, thermodynamic properties, including equilibrium constants, and respective reaction enthalpies are obtained for sodium silicates, zeolite A, and the amorphous form of zeolite A, based on solubility experiments at elevated temperatures. The equilibrium constants for zeolite A and amorphous precursor of zeolite A regarding the following reactions up to 100 °C, NaAlSiO 4 ⋅2.25H 2 O(cr) + 4H + = Na + + Al 3+ + H 4 SiO 4 (aq) + 2.25H 2 O(l) (1) and NaAlSiO 4 ⋅2.25H 2 O(am) + 4H + = Na + + Al 3+ + H 4 SiO 4 (aq) + 2.25H 2 O(l) (2) can be expressed as follows K T log 7963 327 16.46 0.96 1 = ± − ± (3) and K T log 12971 160 30.80 0.50 2 = ± − ±where T is temperature in Kelvin. The enthalpy of formation from elements, Gibbs free energy of formation from elements, and standard entropy derived for zeolite A and the amorphous form of zeolite A with the chemical formulas mentioned above at 25 °C and 1 bar are -2738 ± 5 kJ/mol, -2541 ± 2 kJ/mol, 373 ± 10 J/(K⋅mol); and -2642 ± 3 kJ/mol, -2527 ± 2 kJ/mol, and 648 ± 10 J/(K⋅mol), respectively. The enthalpy of formation from elements for zeolite A derived in this study based on solubility experiments in hydrothermal solutions agrees well with those obtained by calorimetric measurements and by theoretical calculations.

show abstract

Section: Molality Of Naoh (M Naoh )mentioning

confidence: 60%

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 70%

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 99%

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 99%

Section: Pitzer Interaction Parameters In the Na-si-oh Systems Obtainmentioning

confidence: 99%

See 3 more Smart Citations

A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 C: Applications to zeolites

Xiong

2012

American Mineralogist

View full text Add to dashboard Cite

show abstract

Untersuchungen an Reaktionsprodukten von Dinatriumdihydrogensilicathydraten – Na₂H₂SiO₄ · xH₂O – und Dinatriumsilicat – (Na₂SiO₃)_x – mit Wasserstoffperoxid. III¹. Über den Abbau von Dinatriumsilicat‐3‐Wasserstoffperoxid

Rietz

Kopp

1971

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

Na2SiO3 · 3 H2O2 ist eine instabile Verbindung. Beim Lagern bei Raumtemperatur wird Sauerstoff abgegeben. Die Zersetzung beruht auf dem radikalischen Zerfall des Peroxide. Als Zwischenprodukt tritt dabei die Verbindung Na2SiO3 · H2O2 · 2 H2O auf. Sie gibt langsam weiter Sauerstoff ab und geht dabei, in Abhängigkeit von den Bedingungen, in zwei Hydrate: Na2SiO3 · 3 H2O2 und Na2SiO3 · H2O über. Beim thermischen Abbau von Na2SiO3 · 3 H2O2 bildet sich in Abhängigkeit von der Reaktionsführung entweder direkt (Na2SiO3)x oder Na2SiO3 · H2O. Letzteres ist bis zu 480°C stabil und geht erst oberhalb dieser Temperatur in exothermer Reaktion in (Na2SiO3)x über. Die Existenz der Verbindungen wird analytisch und röntgenographisch nachgewiesen.

show abstract

Zur Synthese von kristallinen Metallsilicathydraten mit Schichtstruktur

Schwieger

Heyer

Wolf

et al. 1987

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

Gegenstand der Arbeit ist die Synthese von Metallsilicathydraten (MSH) mit Schichtstruktur durch hydrothermale Kristallisation im ternären System M2/nOSiO2H2O (M = Li, Na, K, Ca, Mg). Die erhaltenen Produkte, die Natriumsilicathydrate Ilerit, Magadiit und Kenyait und ein Kaliumsilicathydrat sind Bestandteile von Produktfolgen im hydrothermalen Quarzbildungsprozeß bei niedrigen Temperaturen. Die Produktfolgen bei verschiedenen Kristallisationsbedingungen werden angegeben und diskutiert.

show abstract

The System Na₂O-SiO₂-H₂O at 50, 70 and 90°^*

Cited by 17 publications

References 0 publications

A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 C: Applications to zeolites

A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 C: Applications to zeolites

Untersuchungen an Reaktionsprodukten von Dinatriumdihydrogensilicathydraten – Na₂H₂SiO₄ · xH₂O – und Dinatriumsilicat – (Na₂SiO₃)_x – mit Wasserstoffperoxid. III¹. Über den Abbau von Dinatriumsilicat‐3‐Wasserstoffperoxid

Zur Synthese von kristallinen Metallsilicathydraten mit Schichtstruktur

Contact Info

Product

Resources

About

The System Na2O-SiO2-H2O at 50, 70 and 90°*

Cited by 17 publications

References 0 publications

A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 C: Applications to zeolites

A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 C: Applications to zeolites

Untersuchungen an Reaktionsprodukten von Dinatriumdihydrogensilicathydraten – Na2H2SiO4 · xH2O – und Dinatriumsilicat – (Na2SiO3)x – mit Wasserstoffperoxid. III1. Über den Abbau von Dinatriumsilicat‐3‐Wasserstoffperoxid

Zur Synthese von kristallinen Metallsilicathydraten mit Schichtstruktur

Contact Info

Product

Resources

About

The System Na₂O-SiO₂-H₂O at 50, 70 and 90°^*

Untersuchungen an Reaktionsprodukten von Dinatriumdihydrogensilicathydraten – Na₂H₂SiO₄ · xH₂O – und Dinatriumsilicat – (Na₂SiO₃)_x – mit Wasserstoffperoxid. III¹. Über den Abbau von Dinatriumsilicat‐3‐Wasserstoffperoxid