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A platform for research: civil engineering, architecture and urbanism
Cobalt-modified Brazilian bentonites: Preparation, characterisation, and thermal stability
Abstract The thermal effect on the phase evolution and crystallinity of raw and cobalt-modified Brazilian bentonites was investigated. The modified bentonites were prepared dispersing the bentonite particles in Co2+ hydroxide gels. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermal analyses and energy dispersive X-ray spectroscopy. An endothermic peak around 900°C indicated the formation of olivine. A test with benzyl alcohol confirmed the catalytic activity as acidic catalyst for alcohol oxidation.
Research Highlights ► A modification of Brazilian bentonites through the addition of a cobalt gel, was proposed. ► Modified-bentonites are thermal stables until 600°C. ► Cobalt-bentonites presented catalytic activity as acid catalyst in alcohol oxidation reactions.
Cobalt-modified Brazilian bentonites: Preparation, characterisation, and thermal stability
Abstract The thermal effect on the phase evolution and crystallinity of raw and cobalt-modified Brazilian bentonites was investigated. The modified bentonites were prepared dispersing the bentonite particles in Co2+ hydroxide gels. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermal analyses and energy dispersive X-ray spectroscopy. An endothermic peak around 900°C indicated the formation of olivine. A test with benzyl alcohol confirmed the catalytic activity as acidic catalyst for alcohol oxidation.
Research Highlights ► A modification of Brazilian bentonites through the addition of a cobalt gel, was proposed. ► Modified-bentonites are thermal stables until 600°C. ► Cobalt-bentonites presented catalytic activity as acid catalyst in alcohol oxidation reactions.
Cobalt-modified Brazilian bentonites: Preparation, characterisation, and thermal stability
Cótica, L.F. (author) / Freitas, V.F. (author) / Santos, I.A. (author) / Barabach, M. (author) / Anaissi, F.J. (author) / Miyahara, R.Y. (author) / Sarvezuk, P.W.C. (author)
Applied Clay Science ; 51 ; 187-191
2010-10-29
5 pages
Article (Journal)
Electronic Resource
English
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