Hydrogen Permeation Measurements on Alumina

The aim of this work is to measure the hydrogen transport and solubility parameters in the commercial alumina. Measurements are conducted using a time‐dependent permeation method over the temperature range 1273–1673 K with hydrogen driving pressures in the range 10 4 –10 5 Pa (100–1000 mbar). A half‐power pressure dependence (diffusion‐limited permeation) of the permeation flux for alumina is observed. The Arrhenius expressions for the hydrogen permeability, diffusivity, and Sieverts' constant values obtained from a fitting to the whole temperature range are as follows: P =3.3·10 −10 exp(−97420/ RT ) mol·m −1 ·s −1 ·Pa −1/2 D =9.7·10 −8 exp(−79990/ RT ) m 2 ·s −1 K s =5.5·10 −3 exp(−22540/ RT ) mol·m −3 ·Pa −1/2