کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
635055 1456083 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hollow fibre membrane reactors for high H2 yields in the WGS reaction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Hollow fibre membrane reactors for high H2 yields in the WGS reaction
چکیده انگلیسی

Alumina hollow fibres with narrow pore size distribution and high surface area/volume ratio are presented as a cost-effective alternative support for metallic membranes which can potentially ease the large-scale implementation of membrane reactors. In this article, we demonstrate the formation of a defect-free thin (∼5 μm) Pd/Ag layer over the smooth outer surface of hollow fibres with high H2 permeation fluxes (48.41 L m−2 h−1 at 450 °C and ΔP0.5 of 1.01 atm0.5) and 100% H2 perm-selectivity. Their use in hollow fibre membrane reactors (HFMR) allows the selective extraction of H2 from the reaction medium, especially relevant in H2-formation equilibrium reactions. Thus, the water-gas shift reaction was used as a proof-reaction. When the HFMR is combined with a highly stable and active nanostructured Pt/CeO2 catalyst, enhanced selectivities and activities are achieved as a result of the integration of the reaction and separation steps. The best results were obtained at high temperatures (375–525 °C) where the thermodynamic equilibrium conversion was exceeded by up to 14%.


► Alumina hollow fibres as an alternative support for thin metallic membranes.
► Formation of defect-free highly permeable Pd/Ag layer with 100% H2 selectivity.
► Hollow fibre membrane reactors (HFMR) to overcome thermodynamic limitations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volumes 405–406, 1 July 2012, Pages 30–37
نویسندگان
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