Hydrogen production by steam methane reforming in a membrane reactor equipped with a Pd composite membrane deposited on a porous stainless steel |
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Authors: | Chang-Hyun Kim Jae-Yun Han Sehwa Kim Boreum Lee Hankwon Lim Kwan-Young Lee Shin-Kun Ryi |
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Affiliation: | 1. Separation and Conversion Materials Laboratory, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-Gu, Daejeon 305-343, South Korea;2. Department of Advanced Materials and Chemical Engineering, Catholic University of Daegu, 13-13 Hayang-yep, Gyeongsan, Gyeongbuk 38430, South Korea;3. Department of Chemical and Biological Engineering, Korea University, 5-1, Anam-dong, Sungbuk-ku, Seoul 136-701, South Korea |
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Abstract: | With the aim of producing hydrogen at low cost and with a high conversion efficiency, steam methane reforming (SMR) was carried out under moderate operating conditions in a Pd-based composite membrane reactor packed with a commercial Ru/Al2O3 catalyst. A Pd-based composite membrane with a thickness of 4–5 μm was prepared on a tubular stainless steel support (diameter of 12.7 mm, length of 450 mm) using electroless plating (ELP). The Pd-based composite membrane had a hydrogen permeance of 2.4 × 10?3 mol m?1 s?1 Pa?0.5 and an H2/N2 selectivity of 618 at a temperature of 823 K and a pressure difference of 10.1 kPa. The SMR test was conducted at 823 K with a steam-to-carbon ratio of 3.0 and gas hourly space velocity of 1000 h?1; increasing the pressure difference resulted in enhanced methane conversion, which reached 82% at a pressure difference of 912 kPa. To propose a guideline for membrane design, a process simulation was conducted for conversion enhancement as a function of pressure difference using Aspen HYSYS®. A stability test for SMR was conducted for ~120 h; the methane conversion, hydrogen production rate, and gas composition were monitored. During the SMR test, the carbon monoxide concentration in the total reformed stream was <1%, indicating that a series of water gas shift reactors was not needed in our membrane reactor system. |
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Keywords: | Steam methane reforming Membrane reactor Pd-based composite membrane Hydrogen Stability Process simulation |
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