ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
CuMgAl hydrotalcite-like compounds with MII/MIII=1 and Cu/Mg molar ratios 3:1, 1:1, 1:3 and 1:19were synthesized by coprecipitation and characterized by elemental analyses, XRD, SEM, FT-IR, TG-DTAand BET surface area test. XRD of all samples showed that Cu/Mg/Al hydrotalcites without any detectableimpurity phase could be obtained at Cu/Mg molar ratios 1:3 and 1:19, however, at high Cu/Mg molar ratios 3:1and 1:1, Al(OH)3 and copper hydroxides or oxides were obtained in the products besides the hydrotalcites,owing to the strong Jahn-Teller effect of Cu2+. It was also found that the crystallinity of the solids increasedwith an increase in copper content. IR results showed that the symmetry of carbonate was reduced from D3hto lower symmetry at high copper content. The thermal stability of the compounds decreased with increasingcopper content, as indicated by TG-DTA measurements. Further thermal decomposition analyses showedthat the surface area reached the maximum at calcination temperature of 500° C and mixed metal oxides withcrystalline MgO, amorphous Al2O3 and highly dispersed CuO were obtained
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.898.pdf
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