Preparation of an H 2 -permselective silica membrane for the separation of H 2 from the hydrogen iodide decomposition reaction in the iodine–sulfur process

Myagmarjav, Odtsetseg; Ikeda, Ayumi; Tanaka, Nobuyuki; Kubo, S.; Nomura, Mikihiro

doi:10.1016/j.ijhydene.2017.01.074

Cited by 24 publications

(16 citation statements)

References 33 publications

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“…Another new application of a membrane reactor, hydrogen purification during a hydrogen iodine decomposition reaction, has been proposed and examined using CVD silica membranes derived from hexylmethoxysilane (Myagmarjav et al, 2017).…”

Section: Membrane Reactormentioning

confidence: 99%

Silica-Based Membranes with Molecular-Net-Sieving Properties: Development and Applications

Tsuru

2018

Journal of Chemical Engineering of Japan

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Over the past several decades, inorganic membranes composed of zeolite, silica, carbon, and metal/organic frameworks (MOF) have improved dramatically in terms of fabrication and application. Pure silica (SiO 2 ) and organosilica membranes for use in molecular separation are the focus of this review. First, the fabrication of these silica-based membranes is outlined to highlight the great progress achieved in sol-gel and CVD processing. Then, applications in gas-and liquid-phase separations and an evaluation of pore sizes are summarized and future perspectives are discussed.

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Section: Membrane Reactormentioning

confidence: 99%

Silica-Based Membranes with Molecular-Net-Sieving Properties: Development and Applications

Tsuru

2018

Journal of Chemical Engineering of Japan

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“…Our research group has been developing silica membranes for some time using a counter diffusion chemical vapor deposition (CVD) method shown in Figure 1 [12][13][14][15][16][17][18][19][20][21]. Here, a silica precursor was used on one side of a porous ceramic substrate, with an oxidant supplied to the opposite side.…”

Section: Introductionmentioning

confidence: 99%

Permeation Properties of Ions through Inorganic Silica-Based Membranes

et al. 2020

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The development of inorganic membranes has mainly found applicability in liquid separation technologies. However, only a few reports cite the permeation and separation of liquids through inorganic nanofiltration membranes compared with the more popular microfiltration membranes. Herein, we prepared silica membranes using 3,3,3-trifluoropropyltrimethoxysilane (TFPrTMOS) to investigate its liquid permeance performance using four different ion solutions (i.e., NaCl, Na2SO4, MgCl2, and MgSO4). The TFPrTMOS-derived membranes were deposited above a temperature of 175 °C, where the deposition behavior of TFPrTMOS was dependent on the organic functional groups decomposition temperature. The highest membrane rejection was from NaCl at 91.0% when deposited at 200 °C. For anions, the SO42− rejections were the greatest. It was also possible to separate monovalent and divalent anions, as the negatively charged groups on the membrane surfaces retained pore sizes >1.48 nm. Ions were also easily separated by molecular sieving below a pore size of 0.50 nm. For the TFPrTMOS-derived membrane deposited at 175 °C, glucose showed 67% rejection, which was higher than that achieved through the propyltrimethoxysilane membrane. We infer that charge exclusion might be due to the dissociation of hydroxyl groups resulting from decomposition of organic groups. Pore size and organic functional group decomposition were found to be important for ion permeation.

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“…Over the past twenty years, the water-splitting iodine-sulfur (IS) process has been extensively investigated as a sustainable technology with a net production of H 2 and O 2 , at much lower temperatures compared with the direct thermal decomposition of water. [1][2][3][4][5][6] The IS process involves cyclic reactions such as the Bunsen reaction and the thermal decompositions of sulfuric acid at 850-950 C and hydroiodic acid at 450 C. In these cycles, the decomposition of sulfuric acid requires temperatures so high that the heat of solar or nuclear energy must be utilized. 3,[5][6][7] Net reaction: 9 nanoltration, 10 reverse osmosis, 11 and gas separation 12 consume the least amount of energy compared with other separation techniques.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17][18] In recent years, several types of membranes have been developed for the iodine-sulfur cycle. 4,[19][20][21][22][23][24][25][26][27][28] Myagmarjav et al reported that a hexyltrimethoxysilane (HTMOS) derived silica membrane achieved H 2 permeance on the order of 10 À7 mol m À2 s À1 Pa À1 with H 2 /HI selectivity of more than 175. 4 In addition, their silica-based ceramic membrane reactor achieved HI conversion of 0.70 and H 2 extraction of 0.98 at 400 C. 27 However, it was also reported that silica membranes can't survive under humid environments at high temperatures, 29 and challenges remain for the use of silica membranes when using water in Bunsen reaction and H 2 SO 4 decomposition reaction.…”

Section: Introductionmentioning

confidence: 99%

SiC mesoporous membranes for sulfuric acid decomposition at high temperatures in the iodine–sulfur process

Wang

Nagasawa

et al. 2020

RSC Adv.

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Preparation of an H 2 -permselective silica membrane for the separation of H 2 from the hydrogen iodide decomposition reaction in the iodine–sulfur process

Cited by 24 publications

References 33 publications

Silica-Based Membranes with Molecular-Net-Sieving Properties: Development and Applications

Silica-Based Membranes with Molecular-Net-Sieving Properties: Development and Applications

Permeation Properties of Ions through Inorganic Silica-Based Membranes

SiC mesoporous membranes for sulfuric acid decomposition at high temperatures in the iodine–sulfur process

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