Methane steam reforming by microporous catalytic membrane reactors

Tsuru, Toshinori; Yamaguchi, Koji; Yoshioka, Tomohisa; Asaeda, Masashi

doi:10.1002/aic.10215

Cited by 142 publications

(90 citation statements)

References 25 publications

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“…The curves showing H2 concentrations, H2 yield and methane conversion in Figs. 13 and 14 were simulated using the experimentally obtained permeances of H2, N2 and H2O without any fitting parameters under the assumption of the infinite reaction rate 21) . This simulation agreed with the experimental data, confirming the applicability of the present simulation model.…”

Section: Bimodal Catalytic Supportmentioning

confidence: 99%

“…However, the permeation properties through microporous silica membranes that consist of silica networks, including hydrogen and helium at high temperatures, are not well understood. Moreover, the permeation of water vapor has been reported in a limited number of papers, probably due to the difficulty of measuring the permeation rate of water vapor and the low stability of microporous silica membranes in a steam atmosphere 11),19), 21) . In this article, the preparation of metal-doped SiO2 membranes via sol-gel processing is reviewed, and characterization including hydrothermal stability and transport properties are discussed.…”

Section: Introductionmentioning

confidence: 99%

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Development of Metal-doped Silica Membranes for Increased Hydrothermal Stability and Their Applications to Membrane Reactors for Steam Reforming of Methane

Tsuru

2011

J. Jpn. Petrol. Inst.

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Hydrothermal stability is one of the most important technical challenges for hydrogen separation silica membranes. Metal doping into silica matrix was proposed, and it was found that Ni and Co were effective to improve the hydrothermal stability. Co-doped silica membranes showed a high permeance of 1.8 10 -7 mol/(m 2 ・s・Pa) and H2/N2 permeance ratio of 730 with hydrothermal stability (500 , steam partial pressure 300 kPa). Using hydrothermally stable silica membranes, permeation properties of helium, hydrogen and water vapor were examined based on the activation energy of permeation. The activation energy of H2 permeation correlated well with the permeance ratio of He/H2. The permeance ratios of H2/H2O of silica membranes are always larger than unity, although the kinetic diameter of hydrogen (0.289 nm) is larger than that of water (0.265 nm). Silica membranes were applied to bimodal catalytic membranes, which consisted of microporous silica top layer for selective permeation of hydrogen and a bimodal catalytic support layer where catalysts such as Ni were impregnated inside a bimodal support consisting of mesopores (γ-alumina) and macropores (α-alumina). Increased performance for production of hydrogen was confirmed by catalytic membranes for steam reforming of methane.

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Section: Bimodal Catalytic Supportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of Metal-doped Silica Membranes for Increased Hydrothermal Stability and Their Applications to Membrane Reactors for Steam Reforming of Methane

Tsuru

2011

J. Jpn. Petrol. Inst.

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“…Hydrogen separation membranes have been of great interest as promising materials for hydrogen production and purification in a variety of applications including membrane reactors [1,2]. Pd based membranes have been extensively studied due to their exclusive hydrogen selectivity and high permeability.…”

Section: Introductionmentioning

confidence: 99%

Preparation of thin and dense electroless-plated Pd membrane by controlling Pd deposition behavior

Miyamoto

Okuda

Oumi

et al. 2011

Trans. Mat. Res. Soc. Japan

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Electroless Pd plating at different deposition temperatures was investigated to control Pd deposition behavior for preparing a much thinner Pd membrane to reduce Pd usage and achieve high hydrogen permeation flux. The deposition temperature directly influenced on the membrane thickness uniformity and defect formation. In our experimental condition, a thin Pd electroless-plated membrane with a thickness of 3 m could be prepared at 333 K using a formic acid bath. It was found that this membrane showed no leakage of helium and high H 2 permeation flux. The rate-limiting step of Pd deposition during the electroless plating must be one of the important factors for preparing the thinner Pd plating membrane with no pinholes.

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“…Much literature is available on the development of membrane reactors for dehydrogenating the organic chemical hydrides with hydrogen-selective membranes. Furthermore, the effectiveness of utilizing membrane reactors has also been demonstrated in other hydrogen production systems, such as the steam reforming reaction of hydrocarbons 31 . The most important issue in determining the performance of membrane reactors is the hydrogen-selective membranes.…”

Section: Introductionmentioning

confidence: 99%

Development of Membrane Reactors for Dehydrogenating Organic Chemical Hydrides to Supply High-purity Hydrogen

Akamatsu

Nakao

2011

J. Jpn. Petrol. Inst.

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This review describes recent developments in the field of membrane reactors for obtaining high-purity hydrogen from organic chemical hydrides using hydrogen-selective amorphous silica membranes prepared by chemical vapor deposition. The application of such membrane reactors for hydrogen production reactions enables us to achieve higher conversion because of equilibrium shifts and to obtain high-purity hydrogen in one step, thus accomplishing an effective hydrogen supply. The most important issue in developing membrane reactors is the selection and preparation of appropriate hydrogen-selective silica membranes for each dehydrogenation reaction. Initially, the pore-size control method was developed by changing chemical structures of silica precursors in the chemical vapor deposition step. Using these membranes, membrane reactors for dehydrogenating cyclohexane or methylcyclohexane were developed and equilibrium shifts were achieved under various reaction conditions. High-purity hydrogen ( 99.9 %) was stably attained by operating the membrane reactors with neither carrier gas nor sweep gas.

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Methane steam reforming by microporous catalytic membrane reactors

Cited by 142 publications

References 25 publications

Development of Metal-doped Silica Membranes for Increased Hydrothermal Stability and Their Applications to Membrane Reactors for Steam Reforming of Methane

Development of Metal-doped Silica Membranes for Increased Hydrothermal Stability and Their Applications to Membrane Reactors for Steam Reforming of Methane

Preparation of thin and dense electroless-plated Pd membrane by controlling Pd deposition behavior

Development of Membrane Reactors for Dehydrogenating Organic Chemical Hydrides to Supply High-purity Hydrogen

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