Solubility of aluminosilicates in alkaline solutions and a thermodynamic equilibrium model

Gasteiger, Hubert A.; Frederick, W.J.; Streisel, Robert C.

doi:10.1021/ie00004a031

Cited by 96 publications

(78 citation statements)

References 11 publications

(13 reference statements)

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“…16 The studies by Gasteiger, Frederick, et al 17 precipitated the zeolite and mixed sodalite phases in the [Al]/[Si] range between 0.076 and 3. These aqueous alkaline solutions had ionic strengths between 1.0 and 4.0 mol/kg at 95°C.…”

Section: Zeolite Sodalite and Cancrinite Nomenclature And Paragenesismentioning

confidence: 99%

“…al. 17 but these investigations have been at insufficiently high NaOH concentrations to be relevant to industrial zeolite synthesis. 22 Recently, Ejaz et.…”

Section: Zeolite Sodalite and Cancrinite Nomenclature And Paragenesismentioning

confidence: 99%

“…• Bayer 20 and Ejaz 22 found that the NAS hydrogels would transform to Zeolite-A • Barrer 20 found that the NAS hydrogels would transform to Zeolite-A at pH values >10 in 2-3 hours at 110°C (the approximate temperature of the 2H Evaporator) • Buhl and Lons 27 showed that nitrated sodalite and nitrated cancrinite could best be made by starting with a Zeolite-A precursor in concentrated NaOH at various temperatures • Wilmarth 28 showed that the Zeolite-A forms as a precursor but the nitrated cancrinite forms on the order of 3-5 hours at 110°C in simulated 2H Evaporator solutions • Gasteiger et al 17 found that basic sodalite Na 8 …”

Section: Zeolite Sodalite and Cancrinite Nomenclature And Paragenesismentioning

confidence: 99%

“…Detailed descriptions of the manner in which the data were added to the GWB database appear in Part I. 3 The data of Ejaz 22 for the solubility of the NAS gel and Zeolite-A was added to the GWB database as was the data of Gasteiger 17 for an amorphous precipitate containing Zeolite-A and nitrited sodalite, hereafter referred to as "mixed zeolite." Ejaz measured solubilities by dissolving Zeolite-A and NAS gel precipitate in 3.02, 3.32, 3.89, and 4.39 molar NaOH solutions.…”

Section: Modeling Approachmentioning

confidence: 99%

“…al. 17 at 95°C in evaporators in the paper and pulp industry, is more likely at 140°C. Therefore, the activity diagrams showing the equilibrium with NAS gel will be presented pairwise with the activity diagrams showing the equilibrium with the Gasteiger mixed zeolite.…”

Section: Activity Diagrams At the Evaporator Temperaturementioning

confidence: 99%

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Thermodynamic Modeling of the SRS Evaporators: Part II. The 3H System

Jantzen¹,

Laurinat²

2001

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Section: Zeolite Sodalite and Cancrinite Nomenclature And Paragenesismentioning

confidence: 99%

“…al. 17 but these investigations have been at insufficiently high NaOH concentrations to be relevant to industrial zeolite synthesis. 22 Recently, Ejaz et.…”

Section: Zeolite Sodalite and Cancrinite Nomenclature And Paragenesismentioning

confidence: 99%

Section: Zeolite Sodalite and Cancrinite Nomenclature And Paragenesismentioning

confidence: 99%

Section: Modeling Approachmentioning

confidence: 99%

Section: Activity Diagrams At the Evaporator Temperaturementioning

confidence: 99%

See 3 more Smart Citations

Thermodynamic Modeling of the SRS Evaporators: Part II. The 3H System

Jantzen¹,

Laurinat²

2001

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Molecular mechanisms responsible for the structural changes occurring during geopolymerization: Multiscale simulation

et al. 2011

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in Wiley Online Library (wileyonlinelibrary.com).To date, the fundamental details of the molecular structural changes and associated mechanisms, which take place during the formation of aluminosilicate geopolymer gels, have remained largely elusive. Here, density functional theory-based coarse-grained Monte Carlo modeling, a multiscale simulation technique, is used to simulate the geopolymerization reaction and to determine the molecular mechanisms controlling this process. Silica supplied by the alkaline solution plays a significant role in enhancing the dissolution of the solid aluminosilicate precursor (metakaolin, in this case) and the polymerization of the gel. In the reaction between NaOH and metakaolin, in the absence of initially dissolved silica, the solid precursor completely dissolves and the aluminosilicate gel forms via the percolation of small aluminosilicate clusters. On the other hand, in the presence of dissolved silicate, the metakaolin only partially dissolves, as the aluminosilicate gel precipitates on the surfaces of the metakaolin particle after a period of time.Note that iteration 0 (commencement of metakaolin dissolution) is displayed as iteration 4000 in the Figure, to enable use of a logarithmic axis scale.The metakaolin particle is the only cluster present at the beginning of the simulation (iteration 0), as displayed in (a). Yellow spheres represent silicate sites and purple spheres are aluminate sites. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.] System H has a Si/Al ratio of 1.0, compared to 1.5 for system H/S and 2.0 for system S.

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Template‐Free Synthesis of Highly b‐Oriented MFI‐Type Zeolite Thin Films by Seeded Secondary Growth

et al. 2019

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Highly b-oriented, closely packed, MFI zeolitefilms are prepared on seeded stainless-steel plates using organic template-free,s econdary growth solutions,c ontaining aluminum sulfate as ac rystallization agent. The number of aoriented twin crystals is significantly reduced, and even eliminated, simply by restricting the pH value of the secondary growth solution to the narrowrange of 11.1-11.3. Values of pH can be adjusted through the controlled addition of (NH 4 ) 2 SO 4 or H 2 SO 4 to secondary growth solutions of the composition (1 SiO 2 :0.57 NaOH:137.5 H 2 O:0.0050 (Al 2 (SO 4 ) 3 ·18 H 2 O)) or by simply decreasing the molar composition of NaOH with no extra additives.

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Solubility of aluminosilicates in alkaline solutions and a thermodynamic equilibrium model

Cited by 96 publications

References 11 publications

Thermodynamic Modeling of the SRS Evaporators: Part II. The 3H System

Thermodynamic Modeling of the SRS Evaporators: Part II. The 3H System

Molecular mechanisms responsible for the structural changes occurring during geopolymerization: Multiscale simulation

Template‐Free Synthesis of Highly b‐Oriented MFI‐Type Zeolite Thin Films by Seeded Secondary Growth

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