Development of a membrane reactor with a closed-end silica membrane for nuclear-heated hydrogen production

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Noguchi, Hiroki; Imai, Yoshiyuki; Kamiji, Yu; Kubo, Shinji; Takegami, Hiroaki

Progress in Nuclear Energy, 137, p.103772_1 - 103772_7, 2021/07

https://doi.org/10.1016/j.pnucene.2021.103772

Hydrogen production tests by hydrogen iodide decomposition membrane reactor equipped with silica-based ceramics membrane

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

International Journal of Hydrogen Energy, 42(49), p.29091 - 29100, 2017/12

https://doi.org/10.1016/j.ijhydene.2017.10.043

The catalytic decomposition of hydrogen iodide in a membrane reactor using silica membranes derived from hexyltrimethoxysilane (HTMOS) was investigated for the production of hydrogen in the thermochemical water splitting iodine-sulfur process. The silica membranes were prepared by counter-diffusion chemical vapor deposition using porous alumina support tubes in both the absence and presence of a -alumina layer. The silica membranes formed on -alumina-coated -alumina tubes displayed a higher H permeance than that formed directly on an -alumina tube. A silica membrane based on a 1.5 m-thick -alumina layer fabricated under deposition conditions of 450C, 1200 s, and a N carrier gas velocity of 0.044 m s exhibited a high H permeance of 9.4 10 mol Pa m s while maintaining an H/N selectivity of over 80.0. The performance of a membrane reactor based on an HTMOS-derived silica membrane was evaluated at 400C by measuring the HI conversion and H flow rates. The conversion was approximately 0.48 when the HI flow rate was 9.7 mL min.

Stability of a silica membrane prepared by CVD using - and -alumina tube as the support tube in the Hi-HO gaseous mixture

Hwang, G.*; Kim, J.*; Choi, H.*; Onuki, Kaoru

Journal of Membrane Science, 215(1-2), p.293 - 302, 2003/04

https://doi.org/10.1016/S0376-7388(03)00022-X

no abstracts in English

Separation of hydrogen from H-HO-HI gaseous mixture using a silica membrane

Hwang, G.; Onuki, Kaoru; Shimizu, Saburo

AIChE Journal, 46(1), p.92 - 98, 2000/01

https://doi.org/10.1002/aic.690460112

no abstracts in English

Studies on hydrogen separation membrane for IS process; Membrane preparation with porous -alumina tube

Hwang, G.*; Onuki, Kaoru; Shimizu, Saburo

JAERI-Research 98-002, 8 Pages, 1998/01

JAERI-Research-98-002.pdf:0.53MB

no abstracts in English

Development of a silica membrane for H production from HI decomposition in the IS process

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

no journal, , 

In this study, we have developed a highly hydrogen permeable silica membrane derived from hexyltrimethoxysilane as a Si precursor using porous alumina support. Modification of alumina support tubes in the absence of and in the presence of -alumina coating was carried out by a counter diffusion chemical vapor deposition (CVD). A membrane with intermediate -alumina layer showed higher H permeance (7.7 10 mol m s Pa) than that formed directly on the -alumina tube (3.8 10 mol m s Pa). It was found that the thickness of -alumina layer played an important role in the improvement of membrane permeation performance. Modified membrane based on -alumina coating with a thickness of 1.5 m exhibited H/SF selectivity over 3000 at 270C, while maintaining H permeance in the order of 10 mol m s Pa. The results led to the conclusion that the modified membrane is a promising candidate for further enhancement of HI decomposition in membrane reactor.