NDLI: X-ray absorption spectroscopies of Mg-Al-Ni hydrotalcite like compound for explaining the generation of surface acid sites

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X-ray absorption spectroscopies of Mg-Al-Ni hydrotalcite like compound for explaining the generation of surface acid sites

Content Provider	Springer Nature Link
Author	Nguyen, Hong Khanh Dieu Nguyen, Toan Dang Hoang, Dung Ngoc Dao, Duc Sy Nguyen, Thao Tien Wanwisa, Limphirat Hoang, Lan Linh
Copyright Year	2017
Abstract	Hydrotalcite-like compound containing metal cations such as Mg$^{2+}$, Al$^{3+}$ and Ni$^{2+}$ was characterized using Ni K-edge EXAFS and in situ Ni K-edge XANES techniques for clarifying its bonding environment around Ni$^{2+}$ sites and structure changes during calcination from room temperature to 550 °C, respectively. At the fixed molar ratio of Mg/Ni/Al of 2/1/1, the results obtained from EXAFS analysis showed a slight blue shift before and after the calcination at 550 °C and a reduction in white line peak; the best fits of the two samples revealed tiny change in coordination number about 7 for Ni-O path but considerable difference for Ni-Mg(Al) path from about 4.5 to 9.5, confirming a modification from brucite like to mixed oxide structure. On the other hand, bond distances of the Ni-O and Ni-Mg paths nearly fixed at about 2.06 Å to 3.0 Å reflected stability of the cationic bond order on each plane, but partial collapse and decomposition of the interlayer formed by water molecules and anion CO 3 2− after the calcination. Linear combination fit extracted from the in situ Ni K-edge XANES also confirmed the changes along with the calcination such as slow and fast decreases of brucite fraction at 150 °C and 330 °C, respectively, in corresponding to the mixed oxide fraction increases. The achieved bonding structures were also applied to explain acid-base occurrence of the hydrotalcite-like material, especially the acid sites generated by different static charges along with the bonds. The explanation was illustrated by NH$_{3}$-TPD method.
Starting Page	314
Ending Page	319
Page Count	6
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	34
Issue Number	2
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2016-12-07
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	EXAFS XAS XANES Hydrotalcite Brucite Industrial Chemistry/Chemical Engineering Catalysis Materials Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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