A Highly hydrogen permeable silica membrane supported on a porous alumina for the hydrogen production

Myagmarjav, O.  ; Ikeda, Ayumi*; Nomura, Mikihiro*; Kubo, Shinji  

The thermal decomposition of hydrogen iodide (HI) to produce hydrogen in a membrane reactor was investigated using the separation characteristics of a silica membrane with the aim of improving the one-pass decomposition rate of HI decomposition reaction in the thermochemical IS process. The silica membranes were prepared by a counter diffusion chemical vapor deposition (CVD) of hexyltrimethoxysilane (HTMOS) using alumina porous support. The membrane reactor phenomenon was evaluated using determined H production rate from HI decomposition at 400C. It was found from experiments that produced H rate was approximately 1.5 mL min in permeated site. Hydrogen was successfully produced and extracted from the HI decomposition membrane reactor with a utilization of the HTMOS silica membrane. The HTMOS silica membrane was effective for the HI decomposition at higher reaction temperature of 400C in the membrane reactor.