Effect of concentration polarization on hydrogen production performance of ceramic-supported Pd membrane module. (21st September 2015)

• Record Type: Journal Article
• Authors: Nakajima, Tatsuya; Kume, Takao; Ikeda, Yoichi; Shiraki, Masahiro; Kurokawa, Hideto; Iseki, Takaya; Kajitani, Masahiro; Tanaka, Hiroyuki; Hikosaka, Hideaki; Takagi, Yasuhiro; Ito, Masaya
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 35(2015)
• Page Start: 11451
• Page End: 11456
• Publication Date: 2015-09-21
• Subjects: Membrane reformer -- Natural gas reforming -- Palladium-silver membrane -- Computer fluid dynamics; CFD computer fluid dynamics -- MOC membrane on catalyst -- MR membrane reactor -- MRF membrane reformer -- HHV higher heating value -- PHA product hydrogen amount -- PSA pressure swing adsorption -- S/C steam/carbon -- SMR steam methane reforming -- TCD thermal conductive detector -- WGS water gas shift; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.03.088
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In on-site hydrogen stations, hydrogen production systems using steam methane reforming and pressure swing adsorption are commonly adopted. However, these systems are too expensive and large for commercial uses. We have earlier developed a compact system of hydrogen production from natural gas using a ceramic-supported Pd membrane module. This system can simultaneously produce and separate pure hydrogen in a single reactor. However, one of the biggest inhibitory factors for hydrogen permeation across a Pd membrane is concentration polarization. Herein, we investigated the effects of linear velocity of feedstock gas on the system's hydrogen production performance, and found that the performance increased on increasing the linear velocity of feedstock gas. This can be explained by the fact that the boundary layer of flow on the membrane became thin, thus decreasing the concentration polarization. We also confirmed the effect of linear velocity on the hydrogen production performance by computer fluid dynamics simulation. Highlights: MRF with thin Pd membrane is expected as next-generation H2 -production system. Performance of MRF is affected by concentration adjacent to the membrane surface. Diameter of reactor vessel is key to the MRF performance.