抄録
Thermochemical water splitting IS process is one of the hydrogen production method. The HI decomposition reaction is one of the key reactions in the IS process. The equilibrium conversion of HI decomposition is about 20% at 400℃. In order to improve the conversion, a membrane reactor with H2 permselective membrane can be applied to the reaction. In this study, a silica hybrid membrane was prepared by using a counter diffusion chemical vapor deposition method. The effects of the deposition conditions on the pore size was discussed. The pore size of the HTMOS derived membrane deposited at 450℃ was evaluated at 0.48 nm indicating that the membrane can be applied for the H2/HI separation. HI permeation tests were performed at room temperature and 400℃ through the HTMOS derived membranes. The H2 permeance was 5.0×10–7 mol m–2 s–1 Pa–1 with the H2/HI selectivity of 6820.
