Physico-Chemical Characterization and Catalytic Properties of Copper-Doped Alumina-Pillared Montmorillonites

K. Bahranowski1, M. Gąsior2, A. Kielski3, J. Podobiński2, E. M. Serwicka2, L. A. Vartikian2, † and K. Wodnicka3
1 Faculty of Geology, Geophysics and Environmental Protection, Academy of Mining and Metallurgy, al. Mickiewicza 30, 30–059 Kraków, Poland
2 Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30–239 Kraków, ul. Niezapominajek 1, Poland
3 Faculty of Material Chemistry and Ceramics, Academy of Mining and Metallurgy, al. Mickiewicza 30, 30–059 Kraków,Poland
Permanent address: Institute of Chemical Physics, Armenian Academy of Sciences, 375044 Erevan, Sevak str. 5/2, Armenia.

Abstract: Cu-doped alumina-pillared montmorillonite samples have been prepared and characterized with X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), electron spin resonance (ESR) and inductive coupled plasma atomic emission spectroscopy (ICP AES) techniques. The results show that the catalysts are porous materials with copper species located in the interlayer, present either as isolated Cu2+ ions anchored at alumina pillars or as patches of amorphous CuO. Catalytic tests with hydroxylation of phenol show that the clay samples possess significant activity for dihydroxybenzene (DHB) formation, comparable with the reference TS-1 catalyst. Experiments with changing the substrate dosing indicate that adsorption and activation of phenol molecules is a necessary condition for the reaction to occur.

Key Words: Alumina • Copper • Copper Catalyst • Montmorillonite • Phenol Hydroxylation • Pillared Clay

Clays and Clay Minerals; February 1998 v. 46; no. 1; p. 98-102; DOI: 10.1346/CCMN.1998.0460111
© 1998, The Clay Minerals Society
Clay Minerals Society (www.clays.org)