Yu Xin, Wang Qing, Nagasawa Hiroki, Kanezashi Masakoto, Tsuru Toshinori
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
RSC Adv. 2020 Nov 17;10(68):41883-41890. doi: 10.1039/d0ra06919a. eCollection 2020 Nov 11.
Inorganic microporous materials have shown promise for the fabrication of membranes with chemical stability and resistance to high temperatures. Silicon-carbide (SiC) has been widely studied due to its outstanding mechanical stability under high temperatures and its resistance to corrosion and oxidation. This study is the first to prepare mesoporous SiC membranes for use in sulphuric acid decomposition to achieve thermochemical water splitting in the iodine-sulfur process. Single-gas permeation was carried out to confirm the stability of this mesoporous membrane under exposure to steam and HSO vapor. Benefiting from the excellent chemical stability of the α-AlO membrane support and the SiC particle layer, the SiC membrane exhibited stable gas permeance without significant degradation under HSO vapor treatment at 600 °C. Additionally, with extraction, the membrane reactor exhibited an increased conversion from 25 to 41% for HSO decomposition at 600 °C. The high performance combined with outstanding stability under acidic conditions suggests the developed SiC membrane is a promising candidate for HSO decomposition in a catalytic membrane reactor.
无机微孔材料在制造具有化学稳定性和耐高温性的膜方面已展现出前景。碳化硅（SiC）因其在高温下出色的机械稳定性以及抗腐蚀和抗氧化性而受到广泛研究。本研究首次制备了用于硫酸分解以实现碘硫过程中热化学水分解的介孔SiC膜。进行了单气体渗透实验以确认该介孔膜在暴露于蒸汽和H₂SO₄蒸汽时的稳定性。得益于α - Al₂O₃膜支撑体和SiC颗粒层优异的化学稳定性，SiC膜在600°C的H₂SO₄蒸汽处理下表现出稳定的气体渗透通量，且无明显降解。此外，通过萃取，膜反应器在600°C下硫酸分解的转化率从25%提高到了41%。其高性能以及在酸性条件下出色的稳定性表明，所开发的SiC膜是催化膜反应器中硫酸分解的一个有前景的候选材料。
