Hydrogen flux deterioration

Finally, the reactions for hydrogen production are often quite endothermic (reforming reactions) or exothermic (e.g. CPO). The temperature control is thus quite important because a decrease in temperature on the membrane surface leads to a decrease in hydrogen flux through the membrane while an increase in temperature could result in crack on the membrane surface with a consequent decrease of permselectivity (and thus deteriorating the MR performance). The heat management and temperature control in PBMRs is quite... 

Although porous metallic supports have good mechanical strength, their large pore sizes and wide pore size distributions make the formation of thin and uniform membrane layers a real challenge. In addition, intermetallic di sion between the metal elements in the support and the membrane layer can cause the hydrogen flux to deteriorate, especially at high temperatures. One way to alleviate or minimize the problem of intermetallic diffusion is to insert an intermetallic diffusion barrier layer between die support and the membrane layer. 

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