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

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

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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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.}",

year = "1989",

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

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journal = "Studies in Surface Science and Catalysis",

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TY - JOUR

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.

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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