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Synthesis of layered zinc hydroxide chlorides in the presence of Al(III) |
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| Authors: | Tatsuo Ishikawa Kumi Matsumoto Takenori Nakayama |
| Institution: | a School of Chemistry, Osaka University of Education, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan b Materials Research Laboratory, Kobe Steel, Ltd., 5-5 Takatsukadai 1-Chome, Nishi-ku, Kobe, Hyogo 615-2271, Japan |
| Abstract: | Zinc hydroxide chloride particles were synthesized by hydrolysis of ZnCl2 solutions dissolving AlCl3 at different atomic Al/Zn ratios from 0 to 1.0 and characterized by various techniques. Increasing Al/Zn ratio changed the crystal phases of the products as ZnO→ZnO+ZHC (Zn5(OH)8Cl2·H2O)→ZHC→LDH (layered double hydroxides, Zn-Al-Cl) and the particle morphology as agglomerates (ZnO)→fine particles (ZnO)→plates (ZHC)+rods (ZnO)→plates (ZHC)→plates (LDH). The atomic Cl/Zn ratios of LDH particles formed at Al/Zn?0.3 were ca. 0.3 despite the increase of Al/Zn ratio, being due to the intercalation of CO32− into the LDH crystal. The OH− content of LDH estimated by TG was reduced by the deprotonation of OH− to counteract the excess positive charge produced by replacing Zn(II) with Al(III). ZHC exhibited a high adsorption selectivity of H2O. |
| Keywords: | Layered compounds Chemical reactions Electron microscopy Infrared spectroscopy Thermogravimetric analysis X-ray diffraction Crystal structure XAFS Gas adsorprion |
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