Crystallization kinetics of Na7.4(AlSiO4)6(CO3)4.7 4H2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Karsten Hackbarth
  • Michael Fechtelkord
  • Josef Christian Buhl

Organisationseinheiten

Externe Organisationen

  • Henkel AG & Co. KGaA
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Details

OriginalspracheEnglisch
Seiten (von - bis)33-39
Seitenumfang7
FachzeitschriftReaction Kinetics and Catalysis Letters
Jahrgang65
Ausgabenummer1
PublikationsstatusVeröffentlicht - 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.

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Crystallization kinetics of Na7.4(AlSiO4)6(CO3)4.7 4H2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions. / Hackbarth, Karsten; Fechtelkord, Michael; Buhl, Josef Christian.
in: Reaction Kinetics and Catalysis Letters, Jahrgang 65, Nr. 1, 1998, S. 33-39.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

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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.",
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Download

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

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