Avaliação de membranas compósitas de Alumina-Pd na separação de gases

Abstract

This work aims to prepare and evaluate Palladium membranes on porous ceramic support of α-alumina, sintered at 1600ºC, using sol-gel and electroless plating technique. It were prepared membranes Pd/α-alumina, with one e two depositions of Pd in the external surface of ceramic support. The ceramic support and the membranes were characterized by morphological analysis through Scanning Electron Microscopy (SEM), Energy Dispersion Spectroscopy (EDS), mercury porosimetry and, the permeability and selectivity to H2, CH4 e CO2 from a bench system. The SEM images show that surface membrane is more uniform with one layer than two Pd layers. Gas permeability test suggest that the composite membranes possessed gas selectivity, and selectivity was of ≈60% for H2/CO2 gas and ≈45% for H2/CH4 gas, regardless of thickness of Pd layer.