Resumo

DAZA, Carlos Enrique; PUENTES, Fabián; MORENO, Sonia  e  MOLINA, Rafael. Al-Ce PILLARED SMECTITE MODIFIED WITH POLYETHYLENE OXIDE. USE AS NICKEL CATALYTIC SUPPORT. Rev.Colomb.Quim. [online]. 2009, vol.38, n.2, pp.257-277. ISSN 0120-2804.

A natural smectite was modified with Al-Ce solutions in the presence of Non-ionic surfactant (polyethilene oxide). The intercalation was carryingoutby ultrasound assistance in order to promote homogenization of the slurry and the diffusion of species into the lamellar space of mineral clay. The effect of surfactant-clay ratio and the potential of these solids like nickel catalytic supports were investigated. Thermogravimetical analysis indicated that the surfactant decomposition it is completed at 500 °C. DRIFT and XRD spectra suggest that the incorporation of the surfactant is on the external surface of clay and that the mineral was pillared. The increase in the surfactant ratio causes a lose of cristallinity material. The presence of surfactant induced mesoporous formation in the material. TPR-H₂ indicated that the modification in presence of surfactant promotes the reducibility of Fe in the mineral. Several Ni reducible species on the support surface were identified. The interaction Ni-support and the reducibility with pure H2 at 700 °C were increased when the mineral clay was modified with the surfactant. Catalysts with good nickel distribution, particle size under 10nm and thermal stability limited was obtained. Ni-Catalyst supported on surfactant modified clays showed the best catalytic performance in the CO₂ reforming of methane at 700 °C (WHSV =60Lg^-1h^-1) whit the lowest coke formation.

Palavras-chave : smectite; surfactant; catalytic support; nickel.

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