NDLI: Factors that affect the thermal stability and properties of Zr-porous clay heterostructures : In situ studies

Content Provider	Springer Nature Link
Author	Kooli, Fethi Liu, Yan Hbaieb, Kais Al Faze, Rawan
Copyright Year	2016
Abstract	New zirconium-porous clay heterostructures (PCHs) were prepared using zirconium-tetramer-intercalated clay mineral as precursors and a subsequent reaction with alkylamine molecules and a silica source, such as tetraethyl orthosilicate. The organic molecules were removed by calcinations at temperatures above 550 °C. The precursors and resulting materials were systematically characterized using different techniques: XRD, XRF, $^{29}$Si MAS NMR, N2 adsorption, and TG-DTG. The thermal stability of the zirconium precursor and porous clay heterostructure was reported for the first time using in situ XRD high temperature. The zirconium content in the PCHs was tuned using the starting precursors with different zirconia percentages, and its presence improved the thermal stability, microtextural properties, and acidity of the PCH materials compared to the conventional PCH materials. The length of the alkyl amine chains used also affected the previously mentioned properties. A higher surface area of 950 m$^{2}$ g$^{−1}$ and pore volume of 0.801 cc g$^{−1}$ were obtained using dodecylamine molecules and Zr-intercalated clay with a starting ratio of Zr (mole) to grams of clay of 6. The zirconium-porous clay heterostructures were stable up to 650 °C, with a total acidity concentration of 0.993 mol g$^{−1}$ of PCH, in addition to strong Brönsted and Lewis acid sites, which were detected at 500 °C in vacuum.
Starting Page	1143
Ending Page	1155
Page Count	13
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	126
Issue Number	3
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-09-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zr-intercalated clays Porous clay heterostructure Thermal stability In situ X-ray diffraction Acidity $^{29}$Si MAS NMR Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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