کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
635144 1456089 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessing the coupled heat and mass transport of hydrogen through a palladium membrane
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Assessing the coupled heat and mass transport of hydrogen through a palladium membrane
چکیده انگلیسی

We have formulated the coupled transport of heat and hydrogen through a palladium membrane, including the dissociative adsorption of hydrogen at the surface. This was done using the systematic approach of non-equilibrium thermodynamics. We show how this approach, which deviates from Sieverts’ law, makes is possible to calculate the direct impact that a temperature gradient, or a heat flux, has on the hydrogen flux. Vice versa, we show how the dissociative adsorption leads to heat sinks and sources at the surface.Using a set of transport coefficients estimated from experimental values available in the literature, calculations were performed. An enhancement of the hydrogen flux through the membrane with 10% and 25%, by transmembrane temperature differences of 24.8 K and 65.6 K, respectively, was predicted with a feed temperature of 673 K. Similarly, a transmembrane temperature difference of −176.5 K was observed to stop the hydrogen flux (Soret equilibrium). The calculations are done with estimated transport properties for the surfaces. The results show that an effort should be put into determination of these. Such experiments are discussed.


► We studied the coupling of heat and massflux in a palladium membrane.
► We calculated the direct impact a temperature gradient has on the massflux.
► Massflux enhanced by 10% and 25% with gradients of 24.8 and 65.6 K, respectively.
► A trans-membrane temperature difference of −176.5 K stops the massflux.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volumes 394–395, 15 March 2012, Pages 131–139
نویسندگان
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