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Method for producing hydrogen by thermochemical process based on hydrochlorination of cerium

A technology of thermochemistry and reaction, applied in chemical instruments and methods, inorganic chemistry, hydrogen production, etc., can solve problems such as difficulty in maintaining the stability of conversion reactors

Inactive Publication Date: 2007-12-05
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] -Solid CeO 2 and CeCl 3 Significant change in the molar volume of , with an increase of 260% between the two, with the result that the stability of the shift reactor is difficult to maintain

Method used

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  • Method for producing hydrogen by thermochemical process based on hydrochlorination of cerium
  • Method for producing hydrogen by thermochemical process based on hydrochlorination of cerium
  • Method for producing hydrogen by thermochemical process based on hydrochlorination of cerium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] In this example, a test to implement reaction (B) was conducted.

[0143] These experiments consisted of making 47 ml of HCl azeotropic solution and 8 mg of CeO in a three-necked flask heated to 110°C with a reflux column on top. 2 (Equivalent to 1.5 times the stoichiometric amount required for total chlorination of the cerium) contact.

[0144] From this test, the possibility of reaching a reaction progress of 0.9 within 40 minutes can be confirmed.

[0145] In the process of using stoichiometric mixtures, it takes several hours to reach a progress of 0.9.

Embodiment 2

[0147] In this example, an experiment was conducted to realize the distillation related to the reaction (B).

[0148] These experiments consisted of making 31 ml of HCl azeotropic solution and 8 mg of CeO in a three-necked flask heated to 110°C with a Vigreux column on top. 2 (Equivalent to a stoichiometric mixture) contact so that all CeO 2 Reacts with chloride ions.

[0149] From this test, it has been confirmed that 95% of the water produced in the cerium oxide chloride process is recovered.

[0150] The pH of the recovered water later became 2, indicating that there was only a small amount of HCl in the solution (10 in the reactor). -2 mol.l -1 To 6.6mol.l -1 , That is, the ratio of 660), this should only slightly interfere with the reaction (A).

Embodiment 3

[0152] In this example, a test to implement reaction (B') was conducted.

[0153] These tests consisted of adding about 4g of CeCl in a round bottom flask heated to 150°C 3 Dissolve in 40 ml of water and allow the mixture to boil until it evaporates completely.

[0154] The recovered insoluble residue is equivalent to CeOCl.

[0155] The kinetics of the overall reaction is limited by the evaporation time.

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Abstract

Thermochemical production of hydrogen from water, based on cerium-chlorine cycle, comprises: a first reaction comprising reducing chlorine, chlorinating cerium oxide and oxidizing cerium chloride; and a second reaction comprising reducing chlorine, chlorinating cerium oxide, oxidizing cerium chloride and oxidizing cerium oxychloride. Thermochemical production of hydrogen from water, based on cerium-chlorine cycle, comprises: a first reaction (comprising: reducing chlorine by reacting water (1 mol) and chlorine (1 mol) to give hydrochloric acid (2 mol) and oxygen (0.5 mol); chlorinating cerium oxide by reacting hydrochloric acid (8 mol) and cerium oxide (2 mol) to give cerium chloride (2 mol), chlorine (1 mol) and water (4 mol); and oxidizing cerium chloride by reacting cerium chloride (2 mol) and water (4 mol) to give cerium oxide (2 mol), hydrochloric acid (6 mol) and hydrogen (1 mol)); and a second reaction (comprising: reducing chlorine by reacting water (1 mol) and chlorine (1 mol) to give hydrochloric acid (2 mol) and oxygen (0.5 mol); chlorinating cerium oxide by reacting hydrochloric acid (8 mol) and cerium oxide (2 mol) to give cerium chloride (2 mol), chlorine (1 mol) and water (4 mol); and oxidizing cerium chloride by reacting cerium chloride (2 mol) and water (2 mol) to give cerium oxychloride (2 mol) and hydrochloric acid (4 mol); and reacting cerium oxychloride (2 mol) and water (2 mol) to give cerium oxide (2 mol), hydrochloric acid (2 mol) and hydrogen (1 mol)), where the chlorination of cerium oxide is carried out in liquid phase by passing the cerium chloride in solution.

Description

Technical field [0001] The present invention relates to a method for generating hydrogen through a thermochemical route based on the cerium-based hydrochlorination reaction cycle. Background technique [0002] The technical field of the present invention can generally be defined as the field of generating hydrogen from water using thermochemical cycles. In other words, the present invention belongs to the field of generating hydrogen based on the thermal decomposition of water with the aid of a "thermokinetic catalyst". [0003] The use of thermochemical cycles to produce hydrogen has been a field that has been extensively studied since the late 1960s. This field has formed a discipline (theme) for systematic evaluation of available elements. [0004] Among these thermochemical cycles, oxidation / reduction based on cerium, especially the cycle of generating hydrogen based on the cerium / chlorine system, has attracted attention. [0005] According to the first alternative form, the ...

Claims

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Application Information

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IPC IPC(8): C01B3/06
CPCY02E60/364C01B3/068Y02E60/36
Inventor 罗歇·博恩克里斯托夫·吉罗尔德弗洛朗·勒莫尔弗拉特科·马泰里奇
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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