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

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

Inactive Publication Date: 2010-05-12
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 for carrying out the reaction (B) was carried out.

[0143] These experiments consisted in making 47ml of HCl azeotropic solution and 8mg of CeO 2 (corresponding to 1.5 times the stoichiometric amount required to fully chloride the cerium) contacts.

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

[0145] In the process of using a stoichiometric mixture, it takes hours to achieve progress to 0.9.

Embodiment 2

[0147] In this example, experiments were performed to achieve distillation associated with reaction (B).

[0148] These experiments consisted in making 31 ml of HCl azeotropic solution with 8 mg of CeO 2 (equivalent to a stoichiometric mixture) in contact so that all CeO 2 Reacts with chloride ions.

[0149] From this test it has been demonstrated that 95% of the water formed during the chlorination of cerium oxide is recovered.

[0150] The pH of the recovered water was later 2, indicating that there was only a very small amount of HCl in solution (10 in the reactor -2 mol.l -1 to 6.6mol.l -1 , ie, a ratio of 660), which should interfere only slightly with response (A).

Embodiment 3

[0152] In this example, a test for carrying out the reaction (B') was carried out.

[0153] These experiments consisted in displacing about 4 g of CeCl in a round bottom flask heated to 150°C 3 Dissolve in 40ml of water and boil the mixture until complete evaporation.

[0154] The recovered undissolved residue corresponds to cerium oxychloride CeOCl.

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

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PUM

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Abstract

The invention concerns a method for producing hydrogen by thermochemical process from water, based on the cerium-chlorine cycle, which consists, in accordance with a first reaction system, in carryingout the following reactions: (A) H2O + Cl2 = 2HCl + 1 / 2O2; (B) 8HCl + 2CeO2 = 2CeCl3 + Cl2 + 4H2O; 10 (C) 2CeCl3 + 4H2O = 2CeO2 + 6HCl + H2; or which consists in accordance with a second reaction system in carrying out the following reactions: (A) H2O + Cl2 = 2HCl + 1 / 2O2; 15 (B) 8HCl + 2CeO2 = 2CeCl3 + Cl2 + 4H2O; (B') 2CeCl3 + 2H2O = 2CeOCl + 4HCl; (C') 2CeOCl + 2H2O = 2CeO2 + 2HCl + H2; and wherein the cerium oxide chlorination reaction (B) is carried in liquid phase, the cerium chloride being transformed into a solution.

Description

technical field [0001] The present invention relates to a method for generating hydrogen by a thermochemical route based on a cerium hydrochlorination reaction cycle. Background technique [0002] The technical field of the invention can generally be defined as that of generating hydrogen from water using thermochemical cycles, in other words, the invention belongs to the field of generating hydrogen based on the thermal decomposition of water by means of "thermodynamic catalysts". [0003] The production of hydrogen using thermochemical cycles is an area that has been extensively studied since the late 1960s, which has formed a discipline (topic) for systematic evaluation of available elements. [0004] Among these thermochemical cycles, cerium-based oxidation / reduction, especially those based on cerium / chlorine systems to generate hydrogen, have attracted attention. [0005] According to a first alternative form, a thermochemical cycle based on cerium oxidation / reduction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/06
CPCC01B3/068Y02E60/364Y02E60/36
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