Measurement of hydrogen permeation through nickel in the elevated temperature range of 450 – 850 °C

Hydrogen separation at elevated temperatures using metallic nickel hollow fiber membranes

“…The activation energy for hydrogen permeation through the HF-03 hollow fiber membrane, E a =51.46 kJ mol -1 is close to the literature values, i.e. 55.3 kJ mol -1 for the disk membrane or 51.07 kJ mol -1 for the Ni hollow fibers sintered at 1400°C 14,23 . Compared with the Pd-based membranes, the Ni hollow fiber membrane exhibited a much higher activation energy for hydrogen permeation (8~15 kJ mol -1 for Pd membranes [33][34][35] ).…”

“…Nickel is a promising alternative to the Pd-based membranes for hydrogen separation due to its remarkably reduced cost and high stability in the hydrogen isotope environment at high temperatures up to 850°C [11][12][13][14] . The H 2 permeation through the Ni membranes has been studied for Accepted Article decades owing to its importance from both scientific and industrial aspects such as H 2 production from water on a large scale by the nuclear technology, where the materials are exposed to a hydrogen isotope environment at very high temperatures.…”

Design of metallic nickel hollow fiber membrane modules for pure hydrogen separation

“…In the above equations, and are the H 2 partial pressures in the upstream (shell side) and downstream (lumen side) (Pa), respectively; V s and V l are the volumetric flow rates of the shell and the lumen phase (m 3 s −1 ), respectively; n is the number of hollow fibers in the module; p s and p v are the absolute pressures on the shell side and at the outlet of the module (Pa), respectively; R is the ideal gas constant (8.314 J mol −1 K −1 ); T is the local temperature (K); and μ is the viscosity of the permeate (H 2 ) gas (Pa s). The H 2 permeation flux can be expressed by the Sieverts’ equation where δ is the membrane thickness (m); P H is the H 2 permeability of the Ni hollow fiber membrane (mol m −1 s −1 Pa −0.5 ), which may be expressed in the form of Arrhenius equation as where P H0 is the pre‐exponential factor of the permeability (mol m −1 s −1 Pa −0.5 ) and E a is the activation energy for hydrogen permeation through the Ni hollow fiber membrane (J mol −1 ).…”

“…Pd‐based membranes have the unavoidable shortcomings such as high material cost, susceptibility to damage by CO, hydrocarbon, and sulfur contaminants, and significant hydrogen embrittlement . Compared to Pd, the metallic Ni‐based membranes are of considerable interest due to their low cost and high thermal and chemical stability . For example, the Ni membrane did not lose any permeability when exposed to 500 ppm H 2 S .…”

Membrane reactors for dry reforming of methane

“…In the field of metallic membranes, a certain attention was captured by nickel (Bulasara, Thakuria, Uppaluri, & Purkait, 2011;Lee, Ohn, & Noh, 2013; Kim, Kim, & Kim, 2009, because it can be used for obtaining a layer and useful for dry reforming, with a lower price. Actually, some studies (Liu et al, 1997;Xue, Chen, Wu, & Deng, 2011) underlined the possibility of a solid phase transition at high temperatures, and this could mean an unstable behavior for the membrane layers.…”