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High-temperature X-ray powder diffraction as a tool for characterization of smectites, layered double hydroxides, and their intercalates with porphyrins

SYSNO ASEP	0347201
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	High-temperature X-ray powder diffraction as a tool for characterization of smectites, layered double hydroxides, and their intercalates with porphyrins
Author(s)	Píšková, Anna (UACH-T) Bezdička, Petr (UACH-T)_{SAI, RID, ORCID} Hradil, David (UACH-T)_{RID, SAI} Káfuňková, E. (CZ) Lang, Kamil (UACH-T)_{SAI, RID, ORCID} Večerníková, Eva (UACH-T)_SAI Kovanda, F. (CZ) Grygar, Tomáš (UACH-T)
Source Title	Applied Clay Science. - : Elsevier - ISSN 0169-1317 Roč. 49, č. 4 (2010), s. 363-371
Number of pages	9 s.
Language	eng - English
Country	NL - Netherlands
Keywords	smectite ; Layered double hydroxides ; thermal decomposition
Subject RIV	CB - Analytical Chemistry, Separation
R&D Projects	GA203/06/1244 GA ČR - Czech Science Foundation (CSF)
	KAN100500651 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	IAA3032401 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z40320502 - UACH-T (2005-2011)
UT WOS	000281425700004
DOI	10.1016/j.clay.2009.09.004
Annotation	We have analyzed expandable clay minerals and layered double hydroxides with different interlayer ions by high-temperature X-ray powder diffraction (HT-XRD) with comparison to thermal analysis (DTG/DTA) coupled with evolved gas analysis (EGA). We described in detail their thermal behaviour with emphasis to the differences among samples related to their crystallochemical characteristics. Porphyrin-intercalated smectites have a quite unique thermal behaviour as monitored by HT-XRD; the intercalates with tetrakis (1-methyl-4-pyridinio)porphyrin have a basal spacing of about 1.4 nm and are thermally stable up to ca. 600 degrees C. The resolution of the individual dehydration steps of smectites (from 2-layer hydrate via 1-layer hydrate to the anhydrous form) is much better in HT-XRD then in DTG/EGA curves. Layered double hydroxides (LDHs) have a varying thermal stability depending on their chemical composition and crystallinity.
Workplace	Institute of Inorganic Chemistry
Contact	Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
Year of Publishing	2011

Number of the records: 1