Synthesis of Zeolite Na-A in The Presence of Triethanolamine

G. Scott; A. G. Dixon; A. Sacco; R. W. Thompson

doi:10.1016/S0167-2991(08)61734-6

Synthesis of Zeolite Na-A in The Presence of Triethanolamine

G. Scott, A. G. Dixon, A. Sacco, R. W. Thompson

Engineering

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Abstract

It has been shown that the addition of triethanolamine (TEA) (22′2″-nitrilotriethanol) to zeolite Na-A synthesis gels with composition Al₂O₃ 0.84SiO₂ 1.94Na₂O xTEA 194H₂O leads to a substantial increase in crystal size. At large TEA additions (x > 10) zeolite Na-X is produced in increasing amounts until almost pure Na-X is observed at x = 30. These observations suggest an aluminum complexing role for TEA such that the nucleation of Na-A is being suppressed. The crystallization rate of the zeolite is also inhibited by the depleted reservoir of unbound aluminum. This phenomenon gives rise to longer crystallization times and larger crystals. A second set of experiments using a reaction composition with lower aluminum content (0.7Al₂O₃ 0.84SiO₂ 1.94Na₂O xTEA 194H₂O) showed similar trends. However, the amount of TEA required to initiate formation of zeolite Na-X in the final product was reduced relative to the first experiment.

Original language	English
Pages (from-to)	363-372
Number of pages	10
Journal	Studies in Surface Science and Catalysis
Volume	49
Issue number	C
DOIs	https://doi.org/10.1016/S0167-2991(08)61734-6
State	Published - Jan 1 1989

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@article{ac06209dc16c428795d824f1e6812dbf,

title = "Synthesis of Zeolite Na-A in The Presence of Triethanolamine",

abstract = "It has been shown that the addition of triethanolamine (TEA) (22′2″-nitrilotriethanol) to zeolite Na-A synthesis gels with composition Al2O3 0.84SiO2 1.94Na2O xTEA 194H2O leads to a substantial increase in crystal size. At large TEA additions (x > 10) zeolite Na-X is produced in increasing amounts until almost pure Na-X is observed at x = 30. These observations suggest an aluminum complexing role for TEA such that the nucleation of Na-A is being suppressed. The crystallization rate of the zeolite is also inhibited by the depleted reservoir of unbound aluminum. This phenomenon gives rise to longer crystallization times and larger crystals. A second set of experiments using a reaction composition with lower aluminum content (0.7Al2O3 0.84SiO2 1.94Na2O xTEA 194H2O) showed similar trends. However, the amount of TEA required to initiate formation of zeolite Na-X in the final product was reduced relative to the first experiment.",

author = "G. Scott and Dixon, {A. G.} and A. Sacco and Thompson, {R. W.}",

note = "Funding Information: The authors would like to thank the Materials Engineering department at WPI for their help in the characterization work. A special thanks goes to George Schmidt for the preparation of the micrographs. This work was sponsored by NASA through the Clarkson Center for the Development of Commercial Crystal Growth in Space.",

year = "1989",

month = jan,

day = "1",

doi = "10.1016/S0167-2991(08)61734-6",

language = "English",

volume = "49",

pages = "363--372",

journal = "Studies in Surface Science and Catalysis",

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T1 - Synthesis of Zeolite Na-A in The Presence of Triethanolamine

AU - Scott, G.

AU - Dixon, A. G.

AU - Sacco, A.

AU - Thompson, R. W.

N1 - Funding Information: The authors would like to thank the Materials Engineering department at WPI for their help in the characterization work. A special thanks goes to George Schmidt for the preparation of the micrographs. This work was sponsored by NASA through the Clarkson Center for the Development of Commercial Crystal Growth in Space.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - It has been shown that the addition of triethanolamine (TEA) (22′2″-nitrilotriethanol) to zeolite Na-A synthesis gels with composition Al2O3 0.84SiO2 1.94Na2O xTEA 194H2O leads to a substantial increase in crystal size. At large TEA additions (x > 10) zeolite Na-X is produced in increasing amounts until almost pure Na-X is observed at x = 30. These observations suggest an aluminum complexing role for TEA such that the nucleation of Na-A is being suppressed. The crystallization rate of the zeolite is also inhibited by the depleted reservoir of unbound aluminum. This phenomenon gives rise to longer crystallization times and larger crystals. A second set of experiments using a reaction composition with lower aluminum content (0.7Al2O3 0.84SiO2 1.94Na2O xTEA 194H2O) showed similar trends. However, the amount of TEA required to initiate formation of zeolite Na-X in the final product was reduced relative to the first experiment.

AB - It has been shown that the addition of triethanolamine (TEA) (22′2″-nitrilotriethanol) to zeolite Na-A synthesis gels with composition Al2O3 0.84SiO2 1.94Na2O xTEA 194H2O leads to a substantial increase in crystal size. At large TEA additions (x > 10) zeolite Na-X is produced in increasing amounts until almost pure Na-X is observed at x = 30. These observations suggest an aluminum complexing role for TEA such that the nucleation of Na-A is being suppressed. The crystallization rate of the zeolite is also inhibited by the depleted reservoir of unbound aluminum. This phenomenon gives rise to longer crystallization times and larger crystals. A second set of experiments using a reaction composition with lower aluminum content (0.7Al2O3 0.84SiO2 1.94Na2O xTEA 194H2O) showed similar trends. However, the amount of TEA required to initiate formation of zeolite Na-X in the final product was reduced relative to the first experiment.

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U2 - 10.1016/S0167-2991(08)61734-6

DO - 10.1016/S0167-2991(08)61734-6

M3 - Article

AN - SCOPUS:77956934829

VL - 49

SP - 363

EP - 372

JO - Studies in Surface Science and Catalysis

JF - Studies in Surface Science and Catalysis

SN - 0167-2991

IS - C

ER -

Synthesis of Zeolite Na-A in The Presence of Triethanolamine

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