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Application of CeO2-based active material to two-step thermochemical cycle decomposition of H2O and/or CO2

A thermochemical cycle and active material technology, applied in the field of preparing H2/CO, which can solve the problems of poor cycle performance, high reduction temperature of metal oxides, and low amount of oxygen vacancies.

Inactive Publication Date: 2013-06-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] It is not difficult to find from the reported work that the two-step thermochemical cycle decomposition of H 2 O / CO 2 The work is still in the primary basic research stage, the main problems of the existing active materials are: (1) the metal oxide reduction temperature is high; (2) the amount of oxygen vacancies that can be recycled is less; (3) Poor cycle performance

Method used

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  • Application of CeO2-based active material to two-step thermochemical cycle decomposition of H2O and/or CO2
  • Application of CeO2-based active material to two-step thermochemical cycle decomposition of H2O and/or CO2
  • Application of CeO2-based active material to two-step thermochemical cycle decomposition of H2O and/or CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] a: Weigh 5.4822g of cerium ammonium nitrate (10mmol) and dissolve it in 75ml of deionized water. After stirring at room temperature for 30min, add 3.1ml (30mmol) of diethylenetriamine DETA (H 2 NCH 2 CH 2 NHCH 2 CH 2 NH 2 ), continue to stir for 30 minutes, pour into a 100ml capacity hydrothermal kettle, and treat at 200°C for 24h; after cooling, centrifuge, dry, and roast at 600°C for 4h.

[0054] When M=La 3+ , Y 3+ 、Sm 3+ When one or more of them, Ce x m 1-x o 2-δ The preparation process of solid solution is as follows:

[0055] Weigh 5.2081-4.660g (NH 4 ) 2 Ce(NO 3 ) 6 , and 0.2165-0.6498gLa (NO 3 ) 3 .6H 2 O, 0.1915-0.5745g Y (NO 3 ) 3 .6H 2 O, 0.1682-0.5046g Sm(NO 3 ) 3 .6H 2 One or more than two kinds of O, dissolved in 75ml deionized water, stirred at room temperature for 30min, then added 3.1ml (30mmol) diethylenetriamine DETA (H 2 NCH 2 CH 2 NHCH 2 CH 2 NH 2 ), continue to stir for 30 minutes, pour into a 100ml capacity hydrotherma...

Embodiment 2

[0060] Weigh 0.5g DETA as a precipitant hydrothermally synthesized CeO 2 Sample (marked as: CeO 2 -1), placed in a reaction tube, the Ar gas flow rate is 100ml / min, the temperature is raised to 1500°C at 5°C / min, the temperature is treated for 40min, the temperature is lowered to 800°C, the temperature is adjusted, the Ar flow rate is adjusted to 400ml / min, and the 100°C The preheated water vapor is brought into the reaction tube, the volume ratio of Ar gas to water vapor is 1:1, and the reaction is completed within 10 minutes. Income O 2 The quantities are listed in Table 1.

Embodiment 3

[0062] Same as Example 2, except that the temperature for decomposing water is 700°C, 900°C, 1000°C, 1100°C, 1200°C;

[0063] When the temperature of decomposed water is 700°C, 900°C, 1000°C or 1100°C, the reaction should be completed within 10 minutes;

[0064] When the temperature of decomposed water is 1200°C, the reaction is completed for 2 hours, and the cycle reaction is repeated for 3 times.

[0065] The results are shown in Table 2, and the cycle results are shown in Table 3.

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Abstract

The invention relates to a method for generating H2 and CO by the two-step thermochemical cycle decomposition of H2O and / or CO2 by taking a nano CexM1-xO2-delta (M is La, Y, Sm or Zr) sosoloid as an active material. The method mainly comprises the following steps of: (1) enabling the active material to release oxygen at a high temperature, and (2) enabling the active material which comprises a large number of oxygen vacancies to react with H2O / CO2 at a low temperature to release H2 / CO. In the Ce0.75Zr0.25O2 system, the yield of H2 is 21ml / g and is higher than the yield of H2 of 11ml / g reported in a literature, and the yield of CO is 25.5ml / g and is higher than the yield of CO of 7ml / g reported in a literature, and in the Ce0.85M0.15O2-delta (M is La, Y or Sm) system, the yield of H2 is 12-13ml / g, and the yield of CO is 13ml / g. The active material can take the high-temperature heat generated from the concentration of solar energy as an energy source, and the H2O / CO2 can serve as a raw material to react to generate the H2 / CO. The method can not lead to the generation of other byproducts, is clean, can not cause pollution and is expected to be an effective technology for preparing a chemical fuel by using the solar energy.

Description

technical field [0001] The present invention involves a two-step thermochemical cycle for decomposing H 2 O / CO 2 , to prepare H 2 / CO, more specifically related to the decomposition of H using ceria-based nano-solid solutions as active materials 2 O / CO 2 , to prepare H 2 / CO, such materials exhibit high reactivity. Background technique [0002] Due to the unsustainability of fossil energy, as well as the greenhouse effect and environmental pollution caused by its use, it is urgent to study a clean and environmentally friendly renewable energy system. Solar energy has the advantages of inexhaustible, clean and pollution-free, renewable, etc., using solar energy to convert H 2 O and the greenhouse gas CO 2 Converting it into a chemical fuel that is easy to store has increasingly received extensive attention from the international community. [0003] Two-step thermochemical cyclic decomposition of metal oxides for H 2 O / CO 2 Technology is the integration of solar ener...

Claims

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Application Information

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IPC IPC(8): C01B3/04C01B31/18C01B32/40
CPCY02E60/36Y02P20/133
Inventor 李灿蒋青青蒋宗轩周桂林
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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