Abstract

CARDENAS, Luis A. et al. Oxygen and Hydrogen adsorption studies by means of the Kelvin probe on an  iron  Phyllosilicate. Rev. LatinAm. Met. Mat. [online]. 2004, vol.24, n.1-2, pp.37-40. ISSN 0255-6952.

The aim of the present work is to study the different oxygen species adsorbed on an iron phyllosilicate catalyst using the Kelvin probe technique. The results of the oxygen and hydrogen adsorption studies on samples with different iron content, Fe(10%)SiO₂, Fe(20%)SiO₂ and Fe(30%)SiO₂ , are presented in the temperature range between 323 K and 723 K. In the Fe(10%)SiO₂ sample the oxygen species adsorbed is O^-₂ for temperatures lower than 473 K, while the O^-2 species is found in the temperature range between 573K and 723K. In the Fe(20%)SiO₂ sample, the O^- oxygen species is adsorbed in this sample at 473K predominantly; while the O^-2  is found on the surface in the temperature range between 623 K and 698 K. The oxygen species adsorbed on  the Fe(30%) SiO₂  sample is  O^-2.

Keywords : Kelvin probe technique; Oxygen and hydrogen adsorption; Iron phyllosilicate catalyst.