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- W2019965992 abstract "Abstract In this work, the influence of superficial defects over the surface of a Pd‐based membrane is analyzed in a membrane reactor for the methane steam‐reforming process. In order to include the presence of defects in the permeation, a previous model of a defect‐free Pd‐based membrane reactor is extended and integrated to include a variable portion of area with defects in the form of pinholes. As a consequence, two different permeation mechanisms are taken into account, one through the Pd‐based surface and the other one through the pinholes, where a Knudsen‐like transport is considered to occur. The presence of the Knudsen transport causes the membrane separation factor between the hydrogen and the other species involved in the process to decrease, affecting the reactor performances significantly. Three reactor performance indices are investigated as functions of the fraction of the defected area and the mean pore diameter of defects, namely methane conversion, the hydrogen recovery factor, the hydrogen recovery yield and the net purity of hydrogen in the permeate. The results show that the hydrogen recovery factor is positively influenced by the decrease in hydrogen selectivity, whilst methane conversion and hydrogen net purity decrease significantly with it. On the contrary, regarding the hydrogen recovery yield, it is shown that in certain conditions (low furnace temperature, ≈ 550 °C) it decreases with hydrogen selectivity. However, it increases again at higher furnace temperatures (≈650 °C). Globally, this investigation helps in identifying acceptable defect levels on a Pd‐based membrane for methane steam‐reforming applications and highlights that even a very small defect level (in terms of the pinhole diameter and/or amount of the defected area) can importantly compromise the reactor performances. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd." @default.
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- W2019965992 date "2009-08-20" @default.
- W2019965992 modified "2023-09-23" @default.
- W2019965992 title "Effect of surface defects in Pd-based membranes on the performance of a membrane reactor" @default.
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- W2019965992 doi "https://doi.org/10.1002/apj.372" @default.
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