S.A. Korili

Performance of palladium and platinum supported on alumina pillared clays in the catalytic combustion of propene

The effect that the metal content of various pillared-clay-supported catalysts may have on the oxidation of propene was studied in this work. For this purpose, an alumina pillared montmorillonite (Al-PILC) was used as a support for palladium and platinum. The catalysts, with metal loadings of between 0 and 2 wt%, were characterized by chemical analysis, nitrogen physisorption at −196 °C, carbon dioxide physisorption at 0 °C, X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), CO and H2 chemisorption at 35 °C, NH3 chemisorption at 70 °C and temperature-programmed reduction (TPR). Bulk PdO, Pd, and palladium–alumina structures were detected for the palladium catalysts. Likewise, bulk PtO2 and small PtO2 particles, which partially interact with the support, were observed for the Pt/Al-PILC catalysts. The results obtained suggest that the propene oxidation over Pd/Al-PILC and Pt/Al-PILC is a structure sensitive reaction as the turnover frequencies are affected by metal dispersion and the structure of the surface catalysts.

Removal of organic pollutants from industrial wastewater: performance evaluation of inorganic adsorbents based on pillared clays

Abstract This work reports the application of a natural clay and an alumina-pillared clay as adsorbents for the removal of a basic dye, Methylene Blue, from aqueous solutions. The intercalation and pillaring processes improve the adsorption capacity of the montmorillonite. The adsorption kinetics of the dye has been studied in terms of pseudo-first-order and pseudo-second-order models. The equilibrium data are mathematically modelled using Freundlich, Langmuir and Sips isotherm adsorption models.

Pillared Clay Catalysts in Green Oxidation Reactions

In this chapter, the use of pillared clays as catalysts in green oxidation reactions is considered. Several catalytic oxidation reactions have been selected, and special attention is given to the reaction products and to the yields achieved.