Thermal analyses of various alkylamines-templated aluminophosphate AlPO4-21

Liping Xiao; Jiyang Li; Xujie Shen; Jihong Yu; Wenqin Pang; Ruren Xu

doi:10.1016/j.micromeso.2005.05.020

Thermal analyses of various alkylamines-templated aluminophosphate AlPO₄-21

Liping Xiao, Jiyang Li, Xujie Shen, Jihong Yu, Wenqin Pang, Ruren Xu^*

^*Corresponding author for this work

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

7 Citations (Scopus)

Abstract

Thermal removals of amine-templated aluminophosphate molecular sieve AlPO₄-21 have been studied by X-ray powder diffraction (XRD), TG-DTA and temperature-programmed decomposition coupled with mass spectrometer (TPD-MS) analyses (amine: ethylamine, dimethylamine and trimethylamine). It is found that the thermal removal of templates and bridging OH groups between two Al atoms is an endothermic process occurring in a single step in inert atmosphere, which accompanies the structural transformation of AlPO₄-21 to AlPO₄-25. The removal temperatures of various organic amines occluded within AlPO₄-21 are directly related to the shapes and sizes of the templates, as well as the proton affinities of guest cations. These factors also determine the removal mechanisms of templates from AlPO ₄-21.

Original language	English
Pages (from-to)	21-26
Number of pages	6
Journal	Microporous and Mesoporous Materials
Volume	84
Issue number	1-3
DOIs	https://doi.org/10.1016/j.micromeso.2005.05.020
Publication status	Published - 15 Sept 2005
Externally published	Yes

Keywords

AlPO-21
Alkylamines
TG-DTA
TPD-MS
Thermal treatment

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10.1016/j.micromeso.2005.05.020

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title = "Thermal analyses of various alkylamines-templated aluminophosphate AlPO4-21",

abstract = "Thermal removals of amine-templated aluminophosphate molecular sieve AlPO4-21 have been studied by X-ray powder diffraction (XRD), TG-DTA and temperature-programmed decomposition coupled with mass spectrometer (TPD-MS) analyses (amine: ethylamine, dimethylamine and trimethylamine). It is found that the thermal removal of templates and bridging OH groups between two Al atoms is an endothermic process occurring in a single step in inert atmosphere, which accompanies the structural transformation of AlPO4-21 to AlPO4-25. The removal temperatures of various organic amines occluded within AlPO4-21 are directly related to the shapes and sizes of the templates, as well as the proton affinities of guest cations. These factors also determine the removal mechanisms of templates from AlPO 4-21.",

keywords = "AlPO-21, Alkylamines, TG-DTA, TPD-MS, Thermal treatment",

author = "Liping Xiao and Jiyang Li and Xujie Shen and Jihong Yu and Wenqin Pang and Ruren Xu",

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T1 - Thermal analyses of various alkylamines-templated aluminophosphate AlPO4-21

AU - Xiao, Liping

AU - Li, Jiyang

AU - Shen, Xujie

AU - Yu, Jihong

AU - Pang, Wenqin

AU - Xu, Ruren

PY - 2005/9/15

Y1 - 2005/9/15

N2 - Thermal removals of amine-templated aluminophosphate molecular sieve AlPO4-21 have been studied by X-ray powder diffraction (XRD), TG-DTA and temperature-programmed decomposition coupled with mass spectrometer (TPD-MS) analyses (amine: ethylamine, dimethylamine and trimethylamine). It is found that the thermal removal of templates and bridging OH groups between two Al atoms is an endothermic process occurring in a single step in inert atmosphere, which accompanies the structural transformation of AlPO4-21 to AlPO4-25. The removal temperatures of various organic amines occluded within AlPO4-21 are directly related to the shapes and sizes of the templates, as well as the proton affinities of guest cations. These factors also determine the removal mechanisms of templates from AlPO 4-21.

AB - Thermal removals of amine-templated aluminophosphate molecular sieve AlPO4-21 have been studied by X-ray powder diffraction (XRD), TG-DTA and temperature-programmed decomposition coupled with mass spectrometer (TPD-MS) analyses (amine: ethylamine, dimethylamine and trimethylamine). It is found that the thermal removal of templates and bridging OH groups between two Al atoms is an endothermic process occurring in a single step in inert atmosphere, which accompanies the structural transformation of AlPO4-21 to AlPO4-25. The removal temperatures of various organic amines occluded within AlPO4-21 are directly related to the shapes and sizes of the templates, as well as the proton affinities of guest cations. These factors also determine the removal mechanisms of templates from AlPO 4-21.

KW - AlPO-21

KW - Alkylamines

KW - TG-DTA

KW - TPD-MS

KW - Thermal treatment

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ER -

Thermal analyses of various alkylamines-templated aluminophosphate AlPO₄-21

Abstract

Keywords

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