Performance and stability of thin, self-supported Pd/Ag and Pd/Cu membranes under methanol steam reforming conditions

FUEL 90

Hilde Venvik, Hilde.Venvik@chemeng.ntnu.no1, Astrid L Mejdell, astridm@chemeng.ntnu.no1, Brynjar F Aardahl, brynjaaa@stud.ntnu.no1, Hallgeir Klette, Hallgeir.Klette@sintef.no2, Bjørnar Arstad, bjornar.arstad@sintef.no3, Rune Bredesen, rune.bredesen@sintef.no2, and Anders Holmen, holmen@chemeng.ntnu.no1. (1) Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway, (2) Department of Energy Conversion and Materials, SINTEF Materials and Chemistry, Pb. 124 Blindern, NO-0314 Oslo, Norway, (3) Department of Hydrocarbon Process Chemistry, SINTEF Materials and Chemistry, Pb. 124 Blindern, NO-0314 Oslo, Norway
1.6 µm thick Pd/Ag (23 wt%) and 1.9 µm thick Pd/Cu (40 wt%) membranes prepared by magnetron sputtering were mounted in a self-supported disk configuration (Ø17.5 mm), where the effects of reactant/product mixtures can be studied without influence of a porous support. The membranes were exposed to a model methanol steam reforming (MSR) product mixture at 250-350 ºC, removing one component at the time(CO, CO2, or CH3OH/H2O replaced by equal amounts of N2) to investigate the effect on permeation and stability. As-grown membranes show permeances of more than 7x10-6 mol/(m2*s*Pa). The hydrogen transport was considerably reduced in presence of the mixture, but increased with temperature due to reduced competitive adsorption of the MSR components. CO and methanol had the strongest inhibiting effects, the effect of CO being instant and partly reversible while methanol had a strong and more long-lasting influence. The effect of CO2 was negligible over Pd/Ag as well as Pd/Cu. Differences in transport properties due to the alloying element could not be identified under the given conditions.
 

Advances in Hydrogen Production
1:30 PM-5:05 PM, Monday, 11 September 2006 Palace -- Marina Room, Oral

Sci-Mix
8:00 PM-10:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Sci-Mix

Division of Fuel Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006