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A system for preparing high-purity hydrogen and a method therefor

A high-purity, hydrogen technology, applied in hydrogen production and other directions, can solve the problems of hydrogen production cost and hydrogen production scale that cannot meet large-scale application, limited wide application, low stability of Pd resources and palladium membrane, etc., and achieve rich raw materials. , low-cost, easy-to-prepare effect

Inactive Publication Date: 2016-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, expensive and limited Pd resources and low stability of palladium film (hydrogen embrittlement and formation of PdC by Pd and carbon-containing compounds 0.15 alloy) limits its wide application, and its hydrogen production cost and hydrogen production scale cannot meet the needs of future large-scale applications

Method used

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  • A system for preparing high-purity hydrogen and a method therefor
  • A system for preparing high-purity hydrogen and a method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The sintered dense oxygen-permeable film La 0.7 Sr 0.3 Cu 0.2 Fe 0.8 o 3-δ (Balachandran U, et al. La 0.7 Sr 0.3 Cu 0.2 Fe 0.8 o 3-δ asoxygentransportmembraneforproducinghydrogenviawatersplitting.ECSTrans2008; 13:393-403.) sanded to a thickness of 0.5mm and filled with Ru / Ce on both sides of the membrane 0.85 SM 0.15 o 1.925 (SDC) Catalyst, the membrane loaded with the catalyst was sealed in a membrane reactor at 961° C. with a silver ring. The effective area of ​​the membrane is 1cm 2 . After slowly cooling down to 900°C, the flow rate of one side of the membrane is 50mLmin -1 H 2 O, the other side with a flow rate of 50mLmin -1 Syngas (n(H 2 ) / n(CO)=1) as purge gas.

[0068] The chromatographic detection results prove that within the detection limit of the chromatogram, only hydrogen exists, and the hydrogen purity is ≥ 5N. The hydrogen separation rate is 3.3mLcm -2 min -1 . After a 100-hour stability test, the hydrogen separation performance did ...

Embodiment 2

[0070] The sintered dense GDC-Ni dual-phase membrane (BalachandranU, etal.Useofmixedconductingmembranestoproducehydrogenbywaterdissociation.IntJHydrogenEnergy2004; 29:291-6) was polished to 0.2mm with sandpaper and filled with Ni / GDC catalyst on both sides of the membrane. Sealed in a membrane reactor at 961 °C. The effective area of ​​the membrane is 1cm 2 . After slowly cooling down to 900°C, one side of the membrane was injected with 50mLmin -1 H 2 O, the other side with a flow rate of 50mLmin -1 Syngas (n(H 2 ) / n(CO)=2) as purge gas.

[0071] The chromatographic detection results prove that within the detection limit of the chromatogram, only hydrogen exists, and the hydrogen purity is ≥ 5N. The hydrogen separation rate is 4.8mLcm -2 min -1 . After a 100-hour stability test, the hydrogen separation performance did not attenuate.

Embodiment 3

[0073] The hollow fiber membrane Ce 0.8 SM 0.2 o 2-δ -La 0.7 Ca 0.3 CrO 3-δ (ChenCS, etal.PreparationandoxygenpermeabilityofCe 0.8 SM 0.2 o 2-δ -La 0.7 Ca 0.3 CrO 3-δ dual-phase composite hollow fibermembrane. Solid State Ionics2012; 225:690-694.) Ru / Ce is filled on both sides of the reactor 0.8 SM 0.2 o 1.9 Catalyst, the effective area of ​​the membrane is 0.92cm 2 . After slowly cooling down to 800°C, one side of the membrane is fed with a flow rate of 80mLmin -1 H 2 O, the other side with a flow rate of 50mLmin -1 Syngas (n(H 2 ) / n(CO)=3) as purge gas.

[0074] The chromatographic detection results prove that within the detection limit of the chromatogram, only hydrogen exists, and the hydrogen purity is ≥ 5N. The hydrogen separation rate is 0.78mLcm -2 min -1 . After a 100-hour stability test, the hydrogen separation performance did not attenuate.

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Abstract

A system for preparing high-purity hydrogen and a method therefor are provided. The system comprises a membrane reactor, an oxygen permeable membrane sealed in the membrane reactor, a catalyst moduleI disposed at one side of the oxygen permeable membrane, a catalyst module II disposed at the other side of the oxygen permeable membrane, a gas feeding device I used for feeding raw material gas intoone side of the oxygen permeable membrane, a gas feeding device II used for feeding purge gas to the opposite side of the oxygen permeable membrane, water vapor adopted as the raw material gas and low-purity hydrogen adopted as the purge gas. The method includes separating a raw material that is the low-purity hydrogen in the mixed-conductor oxygen permeable membrane reactor to obtain the high-purity hydrogen. The hydrogen separation rate and purity of the hydrogen prepared by the method are comparable with those of a palladium membrane. A membrane material used in the method is easily prepared and low in cost, and is hoped to replace the expensive palladium membrane to prepare the high-purity hydrogen.

Description

technical field [0001] The invention relates to a hydrogen purification technology, in particular to a system and method for producing high-purity hydrogen from low-purity hydrogen in an oxygen-permeable membrane reactor. technical background [0002] As a clean, efficient, safe and sustainable new energy, hydrogen energy is regarded as the clean energy with the most development potential in the 21st century, and it is the development direction of human energy strategy. The main utilization method of hydrogen energy is fuel cell. The research on the application of fuel cells in automobiles and commercial ships has become the focus of research and development of future vehicle energy in all countries in the world. At present, the more common and effective hydrogen production method is to use water-gas reforming and water-gas shift reaction to produce hydrogen, but the produced gas contains H 2 , CO 2 、H 2 In addition to gases such as O, it also contains a small amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/04
CPCY02E60/36
Inventor 杨维慎李文平朱雪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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