Preparation and characterisation of a Pt/ceramic catalytic membrane

Anionic impregnation was used to depose platinum onto a porous membrane to be used in a gas-liquid contact Catalytic Membrane Reactor. This membrane w as a tube made of several layers, with a decreasing pore size in the radial direction to the axis. The top layer was mesoporous (pore diameter approxi mate to 5 nm), and made of titania, An amount of 5 mn of Pt crystallites we re selectively deposited to this porous zone and formed branched-shape part icles. Their distribution in the membrane was precisely monitored using ele ctron microscopopy (SEM, TEM and attached analysis methods). The membrane i ntegrity was checked by nitrogen permeation experiments. Other characterisa tion techniques included XRD (crystallite size) and N-2 adsorption (pore si ze distribution). (C) 2001 Elsevier Science B.V. All rights reserved.