Mechanical and textural properties of extruded materials manufactured with AlFe and AlCeFe pillared bentonites

摘要

Extrudates were developed on AlFe and AlCeFe pillared bentonites shaped as pellets, Raschig rings andrnmonoliths were prepared with Na- or Ca-bentonite as binder. The AlFe and AlCeFe poly(hydroxo metal)rnbentonites were tested as catalyst in the oxidation of phenol.rnThe mechanical stability of the extrudates, measured as breaking force was evaluated as a function ofrnthermal treatment (105, 400 and 500 ℃) together with the stability to water immersion. Calcination atrn500 ℃ was needed to obtain water stable materials.rnSpecific surface area, micro- and mesopore volume of the extrudates depended on the calcinationrntemperature. The conversion rate for phenol oxidation with extrudates was generally lower than forrnpowders, due to an increased induction period and diffusion limitations.