Zeolite-Like Material

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Josef-christian Buhl - One of the best experts on this subject based on the ideXlab platform.

  • Crystallization kinetics of Na_7.4(AlSiO_4)_6(CO_3)_0.7·4H_2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions
    Reaction Kinetics and Catalysis Letters, 1998
    Co-Authors: Karsten Hackbarth, Michael Fechtelkord, Josef-christian Buhl
    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.

  • Crystallization kinetics of Na7.4(AlSiO4)6(CO3)0.7·4H2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions
    Reaction Kinetics and Catalysis Letters, 1998
    Co-Authors: Karsten Hackbarth, Michael Fechtelkord, Josef-christian Buhl
    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 diffraction27Al 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.

Karsten Hackbarth - One of the best experts on this subject based on the ideXlab platform.

  • Crystallization kinetics of Na_7.4(AlSiO_4)_6(CO_3)_0.7·4H_2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions
    Reaction Kinetics and Catalysis Letters, 1998
    Co-Authors: Karsten Hackbarth, Michael Fechtelkord, Josef-christian Buhl
    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.

  • Crystallization kinetics of Na7.4(AlSiO4)6(CO3)0.7·4H2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions
    Reaction Kinetics and Catalysis Letters, 1998
    Co-Authors: Karsten Hackbarth, Michael Fechtelkord, Josef-christian Buhl
    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 diffraction27Al 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.

Michael Fechtelkord - One of the best experts on this subject based on the ideXlab platform.

  • Crystallization kinetics of Na_7.4(AlSiO_4)_6(CO_3)_0.7·4H_2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions
    Reaction Kinetics and Catalysis Letters, 1998
    Co-Authors: Karsten Hackbarth, Michael Fechtelkord, Josef-christian Buhl
    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.

  • Crystallization kinetics of Na7.4(AlSiO4)6(CO3)0.7·4H2O, an intermediate phase between cancrinite and sodalite, grown under low temperature hydrothermal conditions
    Reaction Kinetics and Catalysis Letters, 1998
    Co-Authors: Karsten Hackbarth, Michael Fechtelkord, Josef-christian Buhl
    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 diffraction27Al 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.

Qiwu Zhang - One of the best experts on this subject based on the ideXlab platform.

  • The effect of low solid/liquid ratio on hydrothermal synthesis of zeolites from fly ash
    Fuel, 2008
    Co-Authors: Tomasz Wałek, Fumio Saito, Qiwu Zhang
    Abstract:

    Abstract Hydrothermal synthesis of zeolites from class F fly ash was carried out at solid/liquid (S/L) ratio of 4 g/dm3 to investigate the initial dissolution stage of the process. The low S/L ratio caused a significant increase in fly ash dissolution (up to 85 wt%) during first 4 h of reaction. It was shown that for S/L ratios typically used (50–150 g/dm3) fly ash dissolution is largely limited. In these conditions zeolite crystals are formed on the surface of partially dissolved fly ash particles. This precludes further dissolution and results in formation of a low-crystallinity Zeolite-Like Material. At low S/L ratio, a degree of crystallization of 80 wt% was observed, and NaP1, analcime and/or hydroxy-sodalite phases were obtained depending on the applied NaOH concentration and temperature. Single phase NaP1 zeolite was obtained in 2 M NaOH solution at temperature maintained at 104 °C during the stage of dissolution and reduced to 80 °C in the stage of crystallization. Application of low S/L ratio allows a clearer description of the relationships between the synthesis conditions and the products obtained.

Li Hua-jian - One of the best experts on this subject based on the ideXlab platform.

  • Study on gangue-containing aluminosilicate based cementitious Materials
    Journal of China Coal Society, 2005
    Co-Authors: Li Hua-jian
    Abstract:

    High performance gangue-containing aluminosilicate based cementitious Materials were produced with gangue calcined at 500 ℃ and modified alkali silicates solutions as diagenetic admixture.Cementitious Materials with compressive strength growth increasingly(62.1 MPa curing for 3 d and 93.15 MPa curing for 90 d) and favorable construction performance were produced through making full use of the synergistic effect of the compound of gangue,slag and fly ash.Gangue-containing aluminosilicate based cementitious Materials were studied by the methods of XRD,SEM,IR and MAS NMR.The results show that the change of valence-bond and coordination changes for Si and Al.Muscovite,C-S-H gel and a Zeolite-Like Material were found in hydration production.Based on the properties of gangue-containing aluminosilicate based cementitious Materials,in situ bonding hydration mechanism was put forward.