Seshimo Masahiro, Urai Hiromi, Sasa Kazuaki, Nishino Hitoshi, Yamaguchi Yuichiro, Nishida Ryoichi, Nakao Shin-Ichi
Inorganic Membranes Research Center, Research Institute of Innovative Technology for the Earth (RITE), Kyoto 619-0237, Japan.
Membranes (Basel). 2021 Apr 29;11(5):326. doi: 10.3390/membranes11050326.
Methylcyclohexane-toluene system is one of the most promising methods for hydrogen transport/storage. The methylcyclohexane dehydrogenation can be exceeded by the equilibrium conversion using membrane reactor. However, the modularization of the membrane reactor and manufacturing longer silica membranes than 100 mm are little developed. Herein, we have developed silica membrane with practical length by a counter-diffusion chemical vapor deposition method, and membrane reactor module bundled multiple silica membranes. The developed 500 mm-length silica membrane had high hydrogen permselective performance (H permeance > 1 × 10 mol m s Pa, H/SF selectivity > 10,000). In addition, we successfully demonstrated effective methylcyclohexane dehydrogenation using a flange-type membrane reactor module, which was installed with 6 silica membranes. The results indicated that conversion of methylcyclohexane was around 85% at 573 K, whereas the equilibrium conversion was 42%.
甲基环己烷 - 甲苯体系是最具前景的氢传输/存储方法之一。使用膜反应器，甲基环己烷脱氢的平衡转化率可以得到提高。然而，膜反应器的模块化以及制造长度超过100毫米的更长二氧化硅膜的技术发展较少。在此，我们通过反向扩散化学气相沉积法开发了具有实际长度的二氧化硅膜，并将多个二氧化硅膜捆绑成膜反应器模块。所开发的500毫米长的二氧化硅膜具有高的氢渗透选择性性能（氢渗透率>1×10⁻⁷摩尔·米⁻²·秒⁻¹·帕⁻¹，氢/六氟化硫选择性>10000）。此外，我们成功地使用安装了6个二氧化硅膜的法兰式膜反应器模块证明了甲基环己烷的有效脱氢。结果表明，在573K时甲基环己烷的转化率约为85%，而平衡转化率为42%。
