Stable equilibrium shift of methane steam reforming in membrane reactors with hydrogen-selective silica membranes
✍ Scribed by Kazuki Akamatsu; Takuya Murakami; Takashi Sugawara; Ryuji Kikuchi; Shin-ichi Nakao
- Publisher
- American Institute of Chemical Engineers
- Year
- 2010
- Tongue
- English
- Weight
- 562 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0001-1541
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✦ Synopsis
Equilibrium shifts of methane steam reforming in membrane reactors consisting of either tetramethoxysilane-derived amorphous hydrogen-selective silica membrane and rhodium catalysts, or hexamethyldisiloxane-derived membrane and nickel catalysts is experimentally demonstrated. The hexamethyldisiloxane-derived silica membrane showed stable permeance as high as 8 Â 10 À8 mol m À2 s À1 Pa À1 of H 2 after exposure to 76 kPa of vapor pressure at 773 K for 60 h, which was a much better performance than that from the tetramethoxysilane-derived silica membrane. Furthermore, the better silica membrane also maintained selectivity of H 2 /N 2 as high as 10 3 under the above hydrothermal conditions. The degree of the equilibrium shifts under various feedrate and pressure conditions coincided with the order of H 2 permeance. In addition, the equilibrium shift of methane steam reforming was stable for 30 h with an S/C ratio of 2.5 at 773 K using a membrane reactor integrated with hexamethyldisiloxane-derived membrane and nickel catalyst. V