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Title: Investigation of water assisted phase transformation process from AlPO4-5 to AlPO4-tridymite

Abstract

Water assisted phase transformation process from crystalized AlPO4-5 to AlPO4-tridymite was studied by the combination of X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and in situ multinuclear MAS NMR. It is found that water first activates the residue amorphous aluminophosphate in crystalized AlPO4-5 sample through hydrolysis and condensation reactions. Then the activated aluminophosphate species reassemble into AlPO4-tridymite crystalline. Meanwhile, AlPO4-5 transforms into orthorhombic phase during heating process. With further crystallization of AlPO4-tridymite, the amorphous phase is gradually consumed, and mass transportation between AlPO4-5 and AlPO4-tridymite is established through gradually amorphization of AlPO4-5. Finally, most of the AlPO4-5 transforms into the thermodynamically stable dense phase AlPO4-tridymite.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1243222
Report Number(s):
PNNL-SA-115503
Journal ID: ISSN 1387-1811; 48776; KC0302010
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Microporous and Mesoporous Materials; Journal Volume: 223
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Xu, Suochang, Zhao, Zhenchao, Hu, Mary Y., Han, Xiuwen, Hu, Jian Zhi, and Bao, Xinhe. Investigation of water assisted phase transformation process from AlPO4-5 to AlPO4-tridymite. United States: N. p., 2016. Web. doi:10.1016/j.micromeso.2015.10.039.
Xu, Suochang, Zhao, Zhenchao, Hu, Mary Y., Han, Xiuwen, Hu, Jian Zhi, & Bao, Xinhe. Investigation of water assisted phase transformation process from AlPO4-5 to AlPO4-tridymite. United States. doi:10.1016/j.micromeso.2015.10.039.
Xu, Suochang, Zhao, Zhenchao, Hu, Mary Y., Han, Xiuwen, Hu, Jian Zhi, and Bao, Xinhe. Tue . "Investigation of water assisted phase transformation process from AlPO4-5 to AlPO4-tridymite". United States. doi:10.1016/j.micromeso.2015.10.039.
@article{osti_1243222,
title = {Investigation of water assisted phase transformation process from AlPO4-5 to AlPO4-tridymite},
author = {Xu, Suochang and Zhao, Zhenchao and Hu, Mary Y. and Han, Xiuwen and Hu, Jian Zhi and Bao, Xinhe},
abstractNote = {Water assisted phase transformation process from crystalized AlPO4-5 to AlPO4-tridymite was studied by the combination of X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and in situ multinuclear MAS NMR. It is found that water first activates the residue amorphous aluminophosphate in crystalized AlPO4-5 sample through hydrolysis and condensation reactions. Then the activated aluminophosphate species reassemble into AlPO4-tridymite crystalline. Meanwhile, AlPO4-5 transforms into orthorhombic phase during heating process. With further crystallization of AlPO4-tridymite, the amorphous phase is gradually consumed, and mass transportation between AlPO4-5 and AlPO4-tridymite is established through gradually amorphization of AlPO4-5. Finally, most of the AlPO4-5 transforms into the thermodynamically stable dense phase AlPO4-tridymite.},
doi = {10.1016/j.micromeso.2015.10.039},
journal = {Microporous and Mesoporous Materials},
number = ,
volume = 223,
place = {United States},
year = {Tue Mar 01 00:00:00 EST 2016},
month = {Tue Mar 01 00:00:00 EST 2016}
}