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Tubular metallic membrane reactor and application thereof

A membrane reactor and reactor technology, applied in non-metallic elements, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of increasing the reaction space velocity conversion rate, etc., and achieve improved conversion rate and thermal efficiency, excellent sealing structure, The effect of high hydrogen permeability

Inactive Publication Date: 2014-10-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Chen et al [Hydrogen production capacity of membrane reformer for methane steam reforming near practical working conditions, J.Membr.Sci., 322 (2008) 453-459] used a self-made low-temperature Ni-based catalyst in a palladium membrane reactor for methane water For the steam reforming reaction, the performance of the membrane reactor under various reaction conditions was investigated, and it was found that increasing the reaction temperature, pressure, purge ratio, and water-to-carbon ratio is beneficial to increase the conversion rate of methane, while increasing the reaction space velocity will reduce the conversion rate

Method used

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  • Tubular metallic membrane reactor and application thereof
  • Tubular metallic membrane reactor and application thereof
  • Tubular metallic membrane reactor and application thereof

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Embodiment 1

[0032] Preparation of Li by impregnation method 2 O-La 2 o 3 -Ni / α-Al 2 o 3 catalyst. With Li 2 O and La 2 o 3 Ni-based catalysts as promoters were prepared by impregnation. First the tubular α-Al 2 o 3 The inner surface of the porous bottom membrane was impregnated with LiNO 3 , La(NO 3 ) 3 and Ni(NO 3 ) 2 In the mixed solution, it is first dried at 110°C, and then roasted at a high temperature of 600-750°C. Repeat the above heat treatment steps to obtain the inner surface loaded Li 2 O-La 2 o 3 -Ni / α-Al 2 o 3 active catalyst substrates, such as figure 1 shown.

Embodiment 2

[0034] Modification of a layer of γ-Al on the outer surface of porous alumina ceramic bottom film by vacuum sol modification method 2 o 3 , dried naturally for two days, then put into a muffle furnace and heat up to 600 ° C for 1-5 hours to bake for 1-5 hours to obtain a modified porous base film with a thickness of about 5-100 μm and an average pore diameter of about 2-50 nm. The optimized sensitization and activation method was used to introduce palladium seeds on the porous bottom membrane. Then put the bottom film into 0.025mol / L Pd metal salt complex and 1mol / L N 2 h 4 ·H 2 The palladium film was plated in the electroless plating solution composed of O, and the thickness of the palladium composite film was about 5 μm, and it was uniform and dense.

Embodiment 3

[0036] O-shaped rubber ring is used as the sealing material of the palladium membrane reactor, such as figure 2 As shown, the palladium composite film is located inside the stainless steel tube. The palladium composite film is fixed by stainless steel ferrules at both ends of the stainless steel tube, and then the inner connection of the ferrule is sealed with an O-shaped rubber ring. The membrane reactor is placed in a tubular electric furnace, and the stainless steel ferrules at both ends are placed outside the electric furnace, that is, the reactor can be sealed with an O-shaped rubber ring at low temperature and the sealing effect is excellent. Seal the opening of the stainless steel ferrule at the upper end of the membrane reactor, feed the reaction gas from the upper opening of the palladium composite membrane, and vacuum the opening of the stainless steel ferrule at the lower end of the membrane reactor, and the area between the palladium composite membrane and the stai...

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Abstract

The invention provides a tubular metallic membrane reactor and application thereof. The membrane reactor adopts high performance metallic palladium composite membrane as a hydrogen permeation material and uses an O-shaped rubber ring for low temperature sealing or a graphite gasket for high temperature sealing. The membrane reactor has the high-performance hydrogen permeation material, excellent sealing performance, a compact and simple structure and excellent operation stability. During operation of the membrane reactor, permeation of non-hydrogen gas can be prevented, and the tubular metallic membrane reactor is applicable to a small-scale on-site flexible hydrogen production reaction.

Description

technical field [0001] The invention relates to the technical field of membrane catalytic reaction, in particular to a tubular metal membrane reactor and its application. Background technique [0002] With the development of society, energy and environmental problems faced by human beings have become increasingly prominent. As an ideal secondary energy source, hydrogen has a combustion calorific value much higher than that of hydrocarbons and alcohols, and the combustion product is only water, so it has been highly valued by humans as early as the 1970s. In recent years, hydrogen production methods mainly include fossil fuel hydrogen production, electrolytic water hydrogen production and biomass hydrogen production, and these relatively mature hydrogen production technologies require high cost and energy consumption, and high-purity hydrogen cannot be obtained . Hydrogen is the main industrial raw material, and also the most important industrial gas and special gas. It has...

Claims

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Application Information

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IPC IPC(8): C01B3/40C01B3/32
Inventor 杨维慎鲁辉朱琳琳王卫平刘杰丛铀
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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