The Role of Synthesis Parameters in Preparation of Cu, Cr-Layered Double Hydroxides

• Autorzy: Michalik A. , Pacuła A. , Serwicka E. , Bahranowski K. , Gaweł A. , Dziembaj R. , Bielańska E.
• Języki publikacji: EN

Abstrakty

EN

Aseries of Cu,Cr-layered double hydroxides of Cu/Cr ratio equal 2 has been synthesized by co-precipitation at a constant pH, using different preparative conditions. The investigated synthesis parameters included: ageing time, speed of reactants addition, temperature of co-precipitation and pH of synthesis. The dominant product of the synthesis was the nitrate form of Cu,Cr-LDH, containing ca. 10 mol% of carbonate. Modifications of experimental conditions affected chiefly the samples crystallinity. The most obvious effects were associated with changing of pH of the co-precipitation, the most acidic conditions providing a material of the best crystallinity. At the medium synthesis temperature (55°C), a slow addition of the reactants and a long ageing were favourable, but a significant shortening of the ageing time caused only minor deterioration of the sample crystallinity. The latter finding is of practical importance for an upscaling of the process.

Słowa kluczowe

EN

layered double hydroxide; hydrotalcite; synthesis optimization

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2004
• Tom: Vol.78 /nr 11-12
• Strony: 1997--2004
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Michalik A.

• Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Pacuła A.

• Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Serwicka E.

• Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Bahranowski K.

• Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Gaweł A.

• Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Dziembaj R.

• Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-063 Kraków, Poland

autor

Bielańska E.

• Institute of Metallurgy and Material Chemistry, Polish Academy of Science, ul. Reymonta 9, 30-059 Kraków, Poland

Bibliografia

• 1. Cavani F., Trifiro F. and Vaccari A., Catal. Today, 11, 173 (1991).
• 2. Vaccari A., Catal. Today, 41, 53 (1998).
• 3. Vaccari A., Appl. Clay Sci., 13, 161 (1999).
• 4. Bahranowski K.., Bielańska E., Janik R., Machej T. and Serwicka E.M., Clay Miner., 34, 67 (1999).
• 5. Reichle W.T., Solid State Ionics, 22, 135 (1986).
• 6. Grosso R.P., Suib S.L., Weber RS. and Schubert P.F., Chem. Mater., 4, 922 (1992).