Details
| Original language | English |
|---|---|
| Pages (from-to) | 33-39 |
| Number of pages | 7 |
| Journal | Reaction Kinetics and Catalysis Letters |
| Volume | 65 |
| Issue number | 1 |
| Publication status | Published - 1998 |
Abstract
During low temperature hydrothermal alkaline conversion of kaolinite in the presence of sodium carbonate a disordered phase crystallizes showing structural features between the sodalite and cancrinite minerals. A detailed study of its formation field and the kinetics of crystallization is the first step for further investigations of this zeolite-like material. The crystallization kinetics was investigated in the early stage of the reaction for times up to 192 h at a temperature of 353 K. Besides X-ray powder diffraction 27Al MAS NMR has been found to be the preferred method to follow the reaction kinetics because a signal assigned to six-coordinated aluminium of the starting kaolinite can be clearly distinguished from a second resonance, being typical for aluminium in four-coordinate position of an aluminosilicate framework structure. Important conclusions can also be drawn from the experiments for the synthesis of ideal ordered cancrinites.
Keywords
- Cancrinites, Crystallization kinetics, Disordered aluminosilicates, MAS NMR, Sodalites
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Reaction Kinetics and Catalysis Letters, Vol. 65, No. 1, 1998, p. 33-39.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Crystallization kinetics of Na7.4(AlSiO4)6(CO3)4.7 4H2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions
AU - Hackbarth, Karsten
AU - Fechtelkord, Michael
AU - Buhl, Josef Christian
PY - 1998
Y1 - 1998
N2 - During low temperature hydrothermal alkaline conversion of kaolinite in the presence of sodium carbonate a disordered phase crystallizes showing structural features between the sodalite and cancrinite minerals. A detailed study of its formation field and the kinetics of crystallization is the first step for further investigations of this zeolite-like material. The crystallization kinetics was investigated in the early stage of the reaction for times up to 192 h at a temperature of 353 K. Besides X-ray powder diffraction 27Al MAS NMR has been found to be the preferred method to follow the reaction kinetics because a signal assigned to six-coordinated aluminium of the starting kaolinite can be clearly distinguished from a second resonance, being typical for aluminium in four-coordinate position of an aluminosilicate framework structure. Important conclusions can also be drawn from the experiments for the synthesis of ideal ordered cancrinites.
AB - During low temperature hydrothermal alkaline conversion of kaolinite in the presence of sodium carbonate a disordered phase crystallizes showing structural features between the sodalite and cancrinite minerals. A detailed study of its formation field and the kinetics of crystallization is the first step for further investigations of this zeolite-like material. The crystallization kinetics was investigated in the early stage of the reaction for times up to 192 h at a temperature of 353 K. Besides X-ray powder diffraction 27Al MAS NMR has been found to be the preferred method to follow the reaction kinetics because a signal assigned to six-coordinated aluminium of the starting kaolinite can be clearly distinguished from a second resonance, being typical for aluminium in four-coordinate position of an aluminosilicate framework structure. Important conclusions can also be drawn from the experiments for the synthesis of ideal ordered cancrinites.
KW - Cancrinites
KW - Crystallization kinetics
KW - Disordered aluminosilicates
KW - MAS NMR
KW - Sodalites
UR - http://www.scopus.com/inward/record.url?scp=0002091266&partnerID=8YFLogxK
U2 - 10.1007/BF02475312
DO - 10.1007/BF02475312
M3 - Article
AN - SCOPUS:0002091266
VL - 65
SP - 33
EP - 39
JO - Reaction Kinetics and Catalysis Letters
JF - Reaction Kinetics and Catalysis Letters
SN - 0133-1736
IS - 1
ER -