Multi-tube Pd-Ag membrane module for pure hydrogen production: Comparison of methane steam and oxidative reforming

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• 作者：Fabio Borgognoni^a ; ^b ; Silvano Tosti^a ; ^{silvano.tosti@enea.it}
• 关键词：Methane auto-thermal reforming ; Methane steam reforming ; Pure hydrogen ; Pd&ndash ; Ag Membranes
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：9 July, 2013
• 年：2013
• 卷：38
• 期：20
• 页码：8276-8284
• 全文大小：1570 K

文摘

The results of steam and oxidative reforming of methane carried out through a membrane system are being compared in this work. The capability of the experimental setup to produce ultra-pure hydrogen has been evaluated in terms of hydrogen yield under different operating conditions.

The reforming reactions took place over a Pt on Al₂O₃ catalyst in a traditional high temperature reformer, while the hydrogen produced has been removed by selective permeation in a membrane module containing an array of 19 defect-free Pd-Ag tubes (length 250?mm, diameter 10?mm and wall thickness 0.150?mm).

The reformer has been tested in the temperature range of about 570-720?¡ãC while the membrane module temperature has been maintained at 350?¡ãC and the reaction (lumen) pressure has been ranged between 100 and 500?kPa. Methane feed flow rates from about 0.4?¡Á?10^?3 to 1.1?¡Á?10^?3?mol?s^?1 have been fed into the reformer with methane/water molar ratios of 1/4 and methane/water/oxygen of 1/3/0.33 for the steam and the auto-thermal reforming, respectively.

A maximum hydrogen yield value of 2.8 corresponding to a hydrogen flow rate of 1.20?¡Á?10^?3?mol?s^?1 has been measured during the methane steam reforming at pressure of 350?kPa, GHSV of 864?L_(STP) kg^?1?h^?1 and reformer temperature of 700?¡ãC.