Hydrothermal synthesis of gallosilicate (MFI) zeolite: factors influencing crystallization kinetics and crystal size/growth

1998 ◽  
Vol 72 (2) ◽  
pp. 176-182 ◽  
Author(s):  
Vasant R. Choudhary ◽  
Anil K. Kinage
Keyword(s):  
Hydrothermal Synthesis ◽  
Crystallization Kinetics ◽  
Crystal Size ◽  
Mfi Zeolite ◽  
Factors Influencing ◽  
Size Growth

Hydrothermal synthesis of Sn-Beta zeolites in F−-free medium

2018 ◽  
Vol 5 (11) ◽  
pp. 2763-2771 ◽  
Author(s):  
Hao Xu ◽  
Xudong Wang ◽  
Peng Ji ◽  
Haihong Wu ◽  
Yejun Guan ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Lewis Acid ◽  
Crystal Size ◽  
Acid Catalysts ◽  
Free Medium ◽  
Lewis Acid Catalysts ◽  
Structure Directing Agent ◽  
Highly Active ◽  
Beta Zeolites

Sn-Beta zeolites, with high Sn content and smaller crystal size, hydrothermally synthesized in F−-free medium using N-cyclohexyl-N,N-dimethylcyclohexanaminium hydroxide as the structure-directing agent with the assistance of Na+ and seed, are highly active as Lewis acid catalysts.

scholarly journals Regulation of gahnite crystal size during hydrothermal synthesis

2008 ◽  
Vol 121 (8) ◽  
pp. 082007 ◽  
Author(s):  
Y D Ivakin ◽  
M N Danchevskaya ◽  
G P Muravieva
Keyword(s):  
Hydrothermal Synthesis ◽  
Crystal Size

scholarly journals Influence of Pre-Existing Nuclei on the Crystallization Kinetics of Primitive Alkaline Magmas: Insights on the Deep Feeding System of the Campi Flegrei Volcanic District

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 234 ◽  
Author(s):  
Barbara Bonechi
Keyword(s):  
Crystallization Kinetics ◽  
Growth Rates ◽  
Crystal Size ◽  
Starting Material ◽  
Magma Ascent ◽  
Campi Flegrei ◽  
Size Analysis ◽  
Deep Reservoir ◽  
Alkaline Magmas ◽  
Kinetics Of

Aiming to evaluate the influence of pre-existing nuclei on the clinopyroxene crystallization kinetics, time-series experiments were performed using both natural and vitrified starting materials. Experiments were carried out at pressure of 0.8 GPa, temperatures between 1220 and 1250 °C, and dwell times ranging from 0.16 to 12 h. Clinopyroxene growth rates of the runs performed using the natural starting material containing pre-existing nuclei (~2 × 10−7 to ~6 × 10−8 cm∙s−1) are higher than those of the runs performed using the vitrified one (~3 × 10−7 to ~2 × 10−8 cm∙s−1). In both cases the growth rates decrease with increasing time. Conversely, clinopyroxene nucleation rates are lower in the experiments performed using the natural powder (102 and 10 mm−3∙s−1) compared to those performed with the glassy starting material (105 and 103 mm−3∙s−1). The nucleation rates tend to decrease increasing dwell time in all the series up to ~3 h, after which it remains nearly constant. Finally, the combination of the obtained clinopyroxene growth rates with the crystal size analysis of natural clinopyroxenes, allowed to estimate the magma ascent rate and the recharge rate of the Campi Flegrei Volcanic District deep reservoir.

scholarly journals Morphology-Controllable Hydrothermal Synthesis of Zirconia with the Assistance of a Rosin-Based Surfactant

2019 ◽  
Vol 9 (19) ◽  
pp. 4145 ◽  
Author(s):  
Chen Guo ◽  
Peng Wang ◽  
Shengliang Liao ◽  
Hongyan Si ◽  
Shangxing Chen ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Aqueous Solutions ◽  
Pore Size ◽  
Surface Area ◽  
Calcination Temperature ◽  
Pore Volume ◽  
Crystal Size ◽  
Edge Angle ◽  
Large Pore Volume ◽  
Hollow Cube

With the assistance of a rosin-based surfactant, dehydroabietyltrimethyl ammonium bromine (DTAB), well-dispersed hollow cube-like zirconia particles were firstly synthesized by the hydrothermal treatment of ZrOCl2 aqueous solutions. The introduction of DTAB is crucial for improving the dispersion and regularity of the as-synthesized sample. After calcination, the crystal size of the calcined samples increased, and the edge angle of the cube-like particles became round accordingly. Finally, a hollow spherical morphology was formed for the sample calcined at 923 K. The as-synthesized sample showed big surface area of 146.78 m2/g and large pore volume of 0.23 cm3/g. With the increase of calcination temperature, the surface area and pore volume of the samples decreased significantly, and the pore size increased accordingly.

scholarly journals Lipid crystallization kinetics—roles of external factors influencing functionality of end products

2015 ◽  
Vol 4 ◽  
pp. 32-38 ◽  
Author(s):  
Laura Bayés-García ◽  
Ashok R. Patel ◽  
Koen Dewettinck ◽  
Dérick Rousseau ◽  
Kiyotaka Sato ◽  
...  
Keyword(s):  
Crystallization Kinetics ◽  
External Factors ◽  
Lipid Crystallization ◽  
Factors Influencing ◽  
End Products

Ohmic heating technology in dulce de leche: Physical and thermal profile, microstructure, and modeling of crystal size growth

2020 ◽  
Vol 124 ◽  
pp. 278-286
Author(s):  
Ramon Silva ◽  
Ramon S. Rocha ◽  
Jonas T. Guimarães ◽  
Celso F. Balthazar ◽  
Gustavo Luís P.A. Ramos ◽  
...  
Keyword(s):  
Crystal Size ◽  
Ohmic Heating ◽  
Thermal Profile ◽  
Size Growth ◽  
Heating Technology
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