Resumo

PICASSO, Gino; SUN KOU, María del Rosario; SALAZAR, Ivonne  e  LOPEZ, Alcides. Sinthesys of nanostructured catalysts based on Mn oxide for n-hexane elimination. Rev. Soc. Quím. Perú [online]. 2011, vol.77, n.1, pp.11-26. ISSN 1810-634X.

Nanostructured Mn oxide based catalysts were synthesized by solgel method and corresponding bulk samples were prepared by precipitation procedure. In addition, some nanostructured samples based on Mn oxide supported on bentonite (montmorillinite) were prepared by incipient impregnation. Prior to calcination, the system was submitted by TEM analysis in order to study the peptizating effect of acetic acid. The micrographs revealed that the sample prepared from nitrate precursor (0,06 M) achieved the highest monodispersion. After calcination of nanoparticles, TEM analysis has been performed in order to evaluate how extent the peptizating agent is able to disperse. TEM micrographs of samples prepared from nitrate precursor revealed that the peptizating effect increased with the concentration of acetic acid. XRD difractograms of Mn oxide samples showed characteristic welldefined diffraction peaks associated to Mn species as Mn₂O₃, Mn₃O₄ and MnO₂ with more relative intensive signals in Mn₂O₃ and Mn₃O₄ spinel. Finally, synthesized manganese oxide nanoparticles were incorpored into layered structure of purified bentonite (montmorillonite) by incipient impregnation. Some essays with the unsupported and supported samples were performed for nhexane combustion in a fixed bed reactor. Activity of bentonite supported sample was lower than its unsupported bulk sample counterpart; however the performance was higher than the corresponding to the support without active component probably due to more suitable structure position of nanoparticles into layered framework of starting bentonite.

Palavras-chave : Nanosized Mn oxide; sol-gel; bentonite; combustion of n-hexane.

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