The dependence of gas transport characteristics of Pd-Ag membranes on structure of modifying surface

Methods have been developed for producing modifying coatings for gas-diffusion membranes, based on the Pd - 23% Ag alloy. In order to intensify the stages of chemisorption and dissociation and accelerate the general process of hydrogen transfer through the membrane, highly developed surface structures have been synthesized. The hydrogen flux density for Pd - 23% Ag membranes with a developed surface is up to 7 times higher than the hydrogen flux density for similar membranes without a modifying layer, with an excess hydrogen pressure of up to 0.6 MPa and a temperature of up to 100 ° C. During the analysis of the developed methods it was found, that the hydrogen flux density for membranes with a modifying coating, synthesized by a technique that includes a recrystallization step, is 1.3 times higher than the hydrogen flux density for similar membranes, synthesized by a standard method. The possibility of increasing the hydrogen transfer rate for membranes in the SLR (surface-limited regime) by creating highly developed surface structures has been experimentally confirmed.

Keywords

Authors

References