Preparation, characterization and activity of wet‐proofed Pt/silicalite catalysts

Abstract

A procedure for wet‐proofing Pt/silicalite catalysts with polytetrafluoroethylene fibres is described. The procedure yielded catalysts with stable and high activities for the exchange of hydrogen isotopes between liquid water and hydrogen gas. Characterization of the catalysts by hydrogen chemisorption and scanning electron microscopy showed that the wet‐proofing procedure can produce catalysts in which most of the Pt surface in the Pt/silicalite before wet‐proofing can remain accessible. Hydrogen chemisorption was found to be a valuable tool for prescreening of wet‐proofed catalysts.

Preparation and characterization of wet-proofed CuO/Al2O3 catalysts for the oxidation of phenol solutions

“…More recently, Horowitz [9] studied the oxidation of ethanol aqueous solutions using a Pd/alumina hydrophobic catalyst. High metal loadings are recommended for hydrophobized catalysts by Rangwala et al [10] in order to increase the activity per unit volume of reactor.…”

Ethanol oxidation in a trickle-bed reactor using a hydrophobic catalystEffect of dilution with hydrophilic particles

“…The same hydrophilic spheres of ␥-Al 2 O 3 were employed to dilute the bed. The technique applied to coat externally the catalyst particles was proposed by Rangwala et al [22]. The coating procedure did not modify the specific surface area of the catalyst, as determined from N 2 adsorption isotherms at 77 K using the conventional BET procedure.…”