特集 「水素の分離・精製」
CO2選択透過膜を用いた次世代型水素ステーション用水素製造システム
キーワード:
CO2 selective membrane,
membrane reactor,
H2 station,
facilitated transport membrane,
CO shift catalyst
2015 年 40 巻 1 号 p. 20-27
詳細
2015 年 40 巻 1 号 p. 20-27
In this study, we developed a novel membrane reactor consisted of CO shift catalysts and a membrane for CO2 separation. First, we developed facilitated transport membranes for CO2 separation. We tested several carriers to achieve high CO2 permeance (1x10-4mol/m2skPa) and high CO2/H2 selectivity (100). We successfully achieved the target values even at the elevated temperature (160°C). In addition, the developed membrane had good stability. It was confirmed that high performance was maintained stably for 400 hours at 160°C. Secondly, we developed CO shift catalysts, which have high activity for the CO shift reaction at low temperature region. As a result, we succeeded in the development of both precious metal-based catalysts, and Cu-based catalysts. Thirdly, a membrane reactor could be fabricated by combining the developed CO2 selective membranes and CO shift catalysts. Observed CO and CO2 concentrations at the feed-side exit of the membrane reactor were lower than 10 ppm and 1%, respectively. Using membrane reactor it is possible to reduce both CO and CO2 to lower than equilibrium level. Finally, we performed trial design of the total system of a hydrogen station equipped with the developed membrane reactor and evaluated the effect of the membrane reactor on downsizing of the total system and improvement of efficiency.
