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2001•Acta Scientiarum Naturalium Universitatis NeimongolRequires access

Synthesis of Zeolite β

Ke Wang

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Abstract

Zeolite β was synthesized by hydrothermal method in the system of Na 2O SiO 2 Al 2O 3 TEAOH H 2O.The effects of SiO 2/Al 2O 3 ratios and concentration of some reactants in the raw gel on the product′s crystallization process and properties were investigated.The relative crystallinity,cell parameter were characterized by XRD and ICP,respectively.The results shown,the lower initial SiO 2/Al 2O 3 ratio,the higher utilization ratio of Si;SiO 2/Al 2O 3 ratio mainly affects induction period within crystallization procfess;no zeolite β can be made in an aluminium free system;optimum values for various factors are required for efficient synthesis of zeolite β .The apparent activation eneries for nucleation and crystallization are 50 kJ·mol -1 and 101 kJ·mol -1 ,respectively,the nucleation and crystal growth process which correspond to total alkalinity in the system are all two series reactions.

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What this paper is about

Zeolite β was synthesized by hydrothermal method in the system of Na 2O SiO 2 Al 2O 3 TEAOH H 2O.The effects of SiO 2/Al 2O 3 ratios and concentration of some reactants in the raw gel on the product′s crystallization process and properties were investigated.The relative crystallinity,cell parameter were characterized by XRD and ICP,respectively.The results shown,the lower initial SiO 2/Al 2O 3 ratio,the higher utilization ratio of Si;SiO 2/Al 2O 3 ratio mainly affects induction period within crystallization procfess;no zeolite β can be made in an aluminium free system;optimum values for various factors are required for efficient synthesis of zeolite β .The apparent activation eneries for nucleation and crystallization are 50 kJ·mol -1 and 101 kJ·mol -1 ,respectively,the nucleation and crystal growth process which correspond to total alkalinity in the system are all two series reactions.

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Available abstract

Zeolite β was synthesized by hydrothermal method in the system of Na 2O SiO 2 Al 2O 3 TEAOH H 2O.The effects of SiO 2/Al 2O 3 ratios and concentration of some reactants in the raw gel on the product′s crystallization process and properties were investigated.The relative crystallinity,cell parameter were characterized by XRD and ICP,respectively.The results shown,the lower initial SiO 2/Al 2O 3 ratio,the higher utilization ratio of Si;SiO 2/Al 2O 3 ratio mainly affects induction period within crystallization procfess;no zeolite β can be made in an aluminium free system;optimum values for various factors are required for efficient synthesis of zeolite β .The apparent activation eneries for nucleation and crystallization are 50 kJ·mol -1 and 101 kJ·mol -1 ,respectively,the nucleation and crystal growth process which correspond to total alkalinity in the system are all two series reactions.

Key concepts: Zeolite, Crystallization, Nucleation, Crystallinity, Alkalinity, Induction period, Crystal growth, Crystal (programming language)

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