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Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review
Author(s) -
Othman M. R.,
Helwani Z.,
Fernando W. J. N.
Publication year - 2009
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1517
Subject(s) - hydrotalcite , chemistry , calcination , catalysis , crystallization , adsorption , hydrolysis , chemical engineering , inorganic chemistry , precipitation , hydrothermal circulation , hydrate , microwave irradiation , specific surface area , hydrothermal synthesis , organic chemistry , physics , meteorology , engineering
In this paper, widely accepted methods of hydrotalcite preparation such as co‐precipitation, urea hydrolysis, hydrothermal, sol–gel, microwave irradiation, steam activation and solvothermal have been selected and reviewed. Our review indicates that the nature of the divalent cations, the synthesis method, the calcination temperature and the nature of the interlayer species are determinant factors in shaping the surface properties of the layered double hydoxides. The basic strength of the surface base site and structural changes produced in the mixed oxides can be adjusted conveniently by varying the Al content during the synthesis. The combination of sol–gel with microwave irradiation during the gelling and crystallization steps has also been found to increase the surface area of the hydrotalcite‐like compound. Copyright © 2009 John Wiley & Sons, Ltd.