Method for generating hydrogen and oxygen by steam electrolysis

A technology for preparing hydrogen and steam, applied in chemical instruments and methods, through aromatics hydrorefining, separation methods, etc., can solve problems such as overvoltage and electrode delamination, and achieve the effect of improving impedance

Inactive Publication Date: 2014-08-13
FRAMATOME ANP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0030] However, in prior art electrolyzers, applying such current densities across the electrode terminals of proton conducting electrolyzers would result in localized overvoltages, which would lead to electrode delamination phenomena

Method used

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  • Method for generating hydrogen and oxygen by steam electrolysis
  • Method for generating hydrogen and oxygen by steam electrolysis
  • Method for generating hydrogen and oxygen by steam electrolysis

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Embodiment Construction

[0085] image 3 An electrolytic cell 30, also referred to as basic components, for carrying out the electrolytic process of the invention is represented in a general, schematic and simplified manner.

[0086] The electrolytic cell 30 has the figure 2 The device 20 has a similar structure. Thus, the pool 30 contains:

[0087] - anode 32;

[0088] - cathode 33;

[0089] - an electrolyte 31 formed by a proton-conducting electrolyte membrane;

[0090] - means 34 for inducing a current to circulate between the anode 32 and the cathode 33, wherein the current density is not less than 500 mA / cm 2 ;

[0091] - makes it possible to pass the steam pH under pressure through the anode 32 2 O is injected into the means 35 in the membrane 31 (the partial pressure and the relative vapor pressure of the stream are not less than 1 bar and preferably not less than 10 bar).

[0092] It should be noted that the terms partial pressure and relative pressure here refer to the injection pres...

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Abstract

The present invention relates to a method for generating hydrogen and oxygen adsorbates by steam electrolysis at 200 to 800° C. using an electrolysis cell (30) comprising a solid electrolyte (31) which is made of a proton-conducting ceramic and which is arranged between an anode (32) and a cathode (33), each of which comprises a proton-conducting ceramic, and the ratio of the electroactive surface to the geometric surface of each of which is equal to at least 10, said method comprising the following steps: circulating a current between the anode (32) and the cathode (33), wherein the density of the current is no less than 500 mA / cm2; inserting water in the form of steam, which is fed under pressure to the anode (32); oxidizing said water in the form of steam at the anode (32), and generating highly reactive oxygen at the anode (32) after said oxidation; generating protonated species in the electrolyte (31) after said oxidation and migrating said protonated species in the electrolyte (31); and reducing said protonated species at the surface of the cathode (33) in the form of reactive hydrogen atoms.

Description

technical field [0001] This application relates to the production of highly reactive hydrogen and oxygen by steam electrolysis using proton-conducting membranes. Background of the invention [0002] Currently, conductive ceramic membranes are the subject of extensive research to improve their performance. In particular, these membranes find particularly interesting applications in areas such as the electrolysis of water at high temperatures to generate hydrogen, or the electrochemical hydrogenation of carbonaceous gases (CO 2 , CO). Examples of such methods are described in patent applications WO2008152317 and WO2009150352. [0003] Currently, hydrogen (H 2 ) presents a very interesting energy carrier, which may become increasingly important especially for the processing of petroleum products, and which in the long run can advantageously act as petroleum and fossil fuels whose reserves will decrease sharply in the coming decades substitutes for. From this point of view,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/04C25B9/10C25B11/03C25B3/04C10G45/44C10G45/58C10G47/22C01C1/04B01D53/32C25B3/25C25B9/23
CPCB01D2257/404B01D53/326B01D2257/502C25B11/04C25B11/035C25B1/04C10G47/22C25B3/04B01D2257/504C10G45/44B01D2257/302C25B9/10Y02E60/366C10G49/007C25B15/08Y02E60/36Y02P20/151C25B9/23C25B3/25C25B11/031
Inventor B·萨拉F·格拉塞O·拉克鲁瓦A·西拉K·拉莫尼M·凯达姆竹之内久D·格雨里奥B·邦德热伊奥P·科洛邦A·范德利J·G·桑什兹
Owner FRAMATOME ANP
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