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Total oxidation of toluene over calcined trimetallic hydrotalcites type catalysts

2009; Elsevier BV; Volume: 177; Issue: 1-3 Linguagem: Inglês

10.1016/j.jhazmat.2009.12.048

1873-3336

Luz Amparo Palacio, Juliana Velasquez Ochoa, Adriana Echavarrı́a, Arnaldo C. Faro, F. Ramôa Ribeiro, M.F. Ribeiro,

Mesoporous Materials and Catalysis

Two trimetallic ZnCuAl and MnCuAl hydrotalcites have been successfully synthesized by a co-precipitation method. The manganese based material was identified as a new hydrotalcite phase. Both lamellar precursors were calcined at 450 and 600 °C and the resulting catalysts were tested on reaction of total oxidation of toluene. The solids were characterized by X-ray diffraction, thermal analysis, atomic absorption spectroscopy, Fourier transformed infrared spectroscopy, N2 adsorption and H2 temperature-programmed reduction. It was found that ZnCuAl materials are composed of copper and zinc oxides supported on alumina; while MnCuAl ones comprise basically spinel phases, which were not completely identified. The catalytic behavior of the calcined samples showed that Mn hydrotalcite calcined at 450 °C exhibited the best catalytic performance that corresponds to 100% toluene conversion into CO2 at about 300 °C.