Method for deeply removing oxygen in hydrogen through electrocatalysis at normal temperature and pressure to obtain high-purity hydrogen

An electrocatalytic, high-purity technology, applied in chemical instruments and methods, separation methods, electrodes, etc., can solve the problems of high cost of precious metal Pt, high reaction temperature, low palladium element content, etc., and achieve the effect of broad practical application prospects.

Active Publication Date: 2021-10-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation of metal hydrides requires ammonia purging, and the recovery rate of hydrogen is low; patent CN 109012660 discloses a thermocatalytic purification of H 2 Pt-based catalyst, the final product has high purity and high recovery rate, but the reaction temperature is high (≥130 ° C), high energy consumption, high cost of noble metal Pt; palladium membrane diffusion is currently the most widely used hydrogen purification method, but palladium element The content in the earth's crust is very low, the cost is high, and the gas diffusion requires high pressure, which is dangerous

Method used

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  • Method for deeply removing oxygen in hydrogen through electrocatalysis at normal temperature and pressure to obtain high-purity hydrogen
  • Method for deeply removing oxygen in hydrogen through electrocatalysis at normal temperature and pressure to obtain high-purity hydrogen

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The gas diffusion electrode made of Pt nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 0.5M sulfuric acid solution, the separated by a proton exchange membrane, and figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0031] (2) The flow rate of the oxygen-containing hydrogen mixed reaction gas controlled by a gas mass flowmeter is 50 sccm, and the oxygen-containing hydrogen mixed gas used in the experiment consists of: 5% hydrogen, 0.1% oxygen, and the rest is argon.

[0032] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0033] (4) The catalytic activity of Pt nanoparticles was characterized by potentiostatic method, and the oxygen content in the outlet gas was determined by online gas chromatography.

Embodiment 2

[0035](1) The gas diffusion electrode made of Pt nanoparticles is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; both the catholyte and the anolyte are 0.5M KOH solution, with anion exchange membrane separation, and as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0036] (2) The flow rate of the oxygen-containing hydrogen mixed reaction gas controlled by a gas mass flowmeter is 50 sccm, and the oxygen-containing hydrogen mixed gas used in the experiment consists of: 5% hydrogen, 0.1% oxygen, and the rest is argon.

[0037] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0038] (4) The catalytic activity of Pt nanoparticles was characterized by potentiostatic method, and the oxygen content in the outlet gas was determined by online gas chromatography.

Embodiment 3

[0040] (1) Pt 3 The gas diffusion electrode made of Fe is used as the cathode of the electrolytic cell; the gas diffusion electrode made of iridium oxide catalyst is used as the anode of the electrolytic cell; the catholyte and the anolyte are both 0.5M KOH solution, separated by an anion exchange membrane, and Such as figure 1 The schematic diagram of the apparatus shown assembles the various components.

[0041] (2) The flow rate of the oxygen-containing hydrogen mixed reaction gas controlled by a gas mass flowmeter is 50 sccm, and the oxygen-containing hydrogen mixed gas used in the experiment consists of: 5% hydrogen, 0.1% oxygen, and the rest is argon.

[0042] (3) A peristaltic pump is used to control the flow rate of catholyte and anolyte to 50 sccm.

[0043] (4) Using the potentiostatic method Pt 3 The catalytic activity of Fe was determined, and the oxygen content in the outlet gas was determined by online gas chromatography.

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Abstract

The invention relates to a method for deeply removing oxygen in hydrogen through electrocatalysis at normal temperature and pressure to obtain high-purity hydrogen; a gas diffusion electrode electrolytic tank is adopted, a catalyst is sprayed on a gas diffusion layer substrate (including electrically conductive carbon paper, the catalyst and the like) to prepare a gas diffusion electrode, and a cathode and an anode are isolated by an ion exchange membrane. Reaction gas contains oxygen impurities with a certain concentration, electrochemical performance testing is carried out by adopting a three-electrode or two-electrode system constant voltage method, and the oxygen impurities in impurity-containing hydrogen are continuously and deeply removed. By adopting the method provided by the invention, the residual concentration of oxygen can be reduced to 1 ppm or less and the purity of hydrogen can reach 99.9999% or more by regulating and controlling a proper voltage range. Compared with a traditional technology, the method can efficiently reduce and remove oxygen in hydrogen at normal temperature and normal pressure, has the obvious advantages of greenness, safety, low cost, high efficiency and the like, better meets the requirements of green chemical industry, and has a wide practical application prospect.

Description

technical field [0001] The invention belongs to the field of gas purification, and relates to a method for obtaining high-purity hydrogen by electrocatalyzing deep removal of oxygen in hydrogen under normal temperature and pressure. The method utilizes the three-phase reaction characteristic of the gas diffusion electrode, utilizes the cathode oxygen reduction reaction of the electrolytic cell to continuously and efficiently remove the oxygen impurity in the hydrogen, and has no pollution and low energy consumption in the whole process, and conforms to the concept of green chemistry. Background technique [0002] As people continue to pay attention to energy and environmental issues, in order to reduce dependence on non-renewable energy sources such as oil and natural gas, hydrogen energy is favored by people because of its clean, efficient, and wide sources. In recent years, hydrogen energy has played an extremely important role in many fields such as fuel cells, semiconduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/58B01D53/32C25B11/032C25B11/052C25B9/19
CPCC01B3/58B01D53/326C25B11/032C25B11/052C25B9/19B01D2256/16B01D2257/104Y02E60/36
Inventor 张健安思盈
Owner NORTHWESTERN POLYTECHNICAL UNIV
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