Diffusion of hydrogen through platinum membranes at high pressures and temperatures

Details Diffusion of hydrogen through platinum membranes at high pressures and temperatures Diffusion of hydrogen through platinum membranes at high pressures and temperatures

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..281c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 3, pp.281-288

Physics

3

Scientific paper

The diffusion of hydrogen through platinum membranes has been measured at 450, 500, 550 and 600°C at 2000 bar pressure, using the hydrogen sensor technique. Ag + AgCl + 3 M HC1 was the starting solution inside the platinum tube. Hydrogen diffuses out of the platinum tube into a system containing Fe 2 O 3 + Fe 3 O 4 + H 2 O; that is, a solution with a fixed hydrogen fugacity. After quench, the drop in f H 2 inside the platinum tube was calculated from measurements of pH and chloride molality. f H 2 is initially roughly proportional to . Diffusion constants were calculated from these data by numerical integration, and the results can be expressed by log D ( cm 2 / sec ) = - 5489.6/ T , K - 4.648.

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