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Preparation of CaTiO3-coated calcium oxide-based CO2 absorbent

A technology of surface coating and calcium oxide, applied in the direction of inorganic chemistry, carbon compounds, other chemical processes, etc., can solve problems such as difficult industrial application, micropore blockage, industrial application restrictions, etc.

Active Publication Date: 2009-09-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CaO particles and high temperature CO 2 During the reaction, the CaO in the outer layer of the particle is converted to CaCO 3 , its molar volume (36.9cm 3 / mol) is greater than the molar volume of CaO (16.9cm 3 / mol), CaO reacts to adsorb CO 2 CaCO 3 Covering the surface of the unreacted CaO layer causes micropore blockage, CO 2 It is difficult to continue to diffuse into the adsorbent particles to react with CaO, and CaO cannot be completely converted into calcium carbonate, resulting in high temperature CO 2 Decreased capacity for reactive adsorption
At the same time, if placed in a high temperature environment for a long time, sintering and agglomeration will occur between the particles of the adsorbent, resulting in a decrease in the effective surface area and a decrease in the pore volume; Changes will also change the pore structure of the adsorbent
Therefore, the existing calcium oxide-based high-temperature CO 2 The main problem with the adsorbent is: the adsorption of the adsorbent on CO 2 The adsorption rate in the adsorption and desorption of CO 2 It decays rapidly during repeated use, and the adsorption rate decreases after repeated use, making it difficult for industrial application
However, the sol-gel coating operation is not suitable for industrial production, and its industrial application is limited

Method used

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  • Preparation of CaTiO3-coated calcium oxide-based CO2 absorbent
  • Preparation of CaTiO3-coated calcium oxide-based CO2 absorbent
  • Preparation of CaTiO3-coated calcium oxide-based CO2 absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Dissolve 2.85 g of ethyl titanate in 100 ml of absolute ethanol to form a uniform transparent solution.

[0053] (2) Disperse 9 g of nano calcium carbonate with a particle size of 50 nm in the above solution using an ultrasonic disperser.

[0054] (3) Stir and drop 3ml of distilled water, and continue to stir for 3 hours.

[0055] (4) Filter with suction and dry until the ethanol and excess water have evaporated, then grind the solid sample to obtain Ti(OH) 4 Coated nano calcium carbonate.

[0056] (5) The obtained Ti(OH) 4 The coated nano-calcium carbonate is heat-treated at 400℃ for 5 hours, and the heating rate is: 20℃ / min to obtain TiO 2 Coated nano calcium carbonate.

[0057] (6) The obtained TiO 2 The coated nano-calcium carbonate is calcined under 750℃ air atmosphere for 3 hours, the heating rate is: 20℃ / min, and the surface is coated with CaTiO 3 Nano calcium oxide adsorbent.

[0058] Performance test: The prepared adsorbent is subjected to 10 decarburization-ca...

Embodiment 2

[0063] (1) Dissolve 3.55 g of isopropyl titanate in 100 ml of absolute ethanol to form a uniform transparent solution.

[0064] (2) Disperse 9 g of nanometer calcium carbonate with a particle size of 70 nm in the above solution using an ultrasonic disperser.

[0065] (3) Stir and drop 4 ml of distilled water, and continue to stir for 2 hours.

[0066] (4) Filter with suction and dry until the ethanol and excess water have evaporated, then grind the solid sample to obtain Ti(OH) 4 Coated nano calcium carbonate.

[0067] (5) The obtained Ti(OH) 4 The coated nano-calcium carbonate is heat-treated at 500℃ for 4 hours, and the heating rate is: 20℃ / min to prepare TiO 2 Coated nano calcium carbonate.

[0068] (6) The obtained TiO 2 The coated nano-calcium carbonate is calcined under 800℃ air atmosphere for 3 hours, the heating rate is 30℃ / min, and the surface is coated with CaTiO 3 Nano calcium oxide adsorbent.

[0069] Performance test: The prepared adsorbent is subjected to 10 decarbur...

Embodiment 3

[0071] (1) Dissolve 4.26 g of butyl titanate in 200 ml of water ethanol to form a uniform transparent solution.

[0072] (2) Disperse 9 g of nano calcium carbonate with a particle size of 50 nm in the above solution using an ultrasonic disperser.

[0073] (3) Stir and drop 3ml of distilled water, and continue to stir for 5 hours.

[0074] (4) Filter with suction and dry until the ethanol and excess water have evaporated, then grind the solid sample to obtain Ti(OH) 4 Coated nano calcium carbonate.

[0075] (5) The obtained Ti(OH) 4 The coated nano-calcium carbonate is heat-treated at 600℃ for 3 hours, and the heating rate is 30℃ / min to obtain TiO 2 Coated nano calcium carbonate.

[0076] (6) The obtained TiO 2 The coated nano-calcium carbonate is calcined under 900℃ air atmosphere for 2 hours, the heating rate is 30℃ / min, and the surface is coated with CaTiO 3 Nano calcium oxide adsorbent.

[0077] Performance test: The prepared adsorbent is subjected to 10 decarburization-carboni...

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Abstract

The invention discloses a preparation method of a CaTiO3-coated calcium oxide-based CO2 absorbent, comprising the following steps: dissolving titanate in organic solvent for forming solution, then adding nano-calcium carbonate therein for forming suspension; adding water in the suspension for leading the titanate to generate the hydrolysis reaction, forming a Ti(OH)4 coating layer on the surface of the nano-calcium carbonate; carrying out the thermal treatment on the separated Ti(OH)4-coated nano-calcium carbonate at 300-600 DEG C, carrying out the dehydration reaction for forming TiO2-coated nano-calcium carbonate; and calcining at 750-1100 DEG C, thereby obtaining the CaTiO3-coated calcium oxide-based high temperature CO2 absorbent. The absorbent prepared by the method shows the advantages of high CO2 absorption capacity and high absorption stability during the multi-cycle process.

Description

Technical field [0001] The invention relates to a calcium oxide-based CO 2 The preparation method of adsorbent, especially relates to a surface coated with CaTiO 3 Calcium oxide-based high temperature CO 2 Preparation method of adsorbent. Background technique [0002] According to calcium oxide and CO 2 The principle of reaction, calcium oxide-based adsorbent can adsorb high temperature CO 2 , Has important application prospects in energy saving and emission reduction, environmental protection, energy utilization and conversion, oil refining and chemical industry. In the environmental field of energy saving and emission reduction, calcium oxide-based adsorbents can be used to remove CO contained in flue gas generated during fossil fuel power generation. 2 (Anthony, EJ, Solid looping cycles: A new technology for coal conversion. Ind. Eng. Chem. Res. 2008, 47, 1747-1754); in the fields of oil refining, chemical industry and future hydrogen energy, calcium oxide-based adsorbents can...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/32C01B31/20C01B32/50
CPCY02A50/20
Inventor 吴素芳朱艳青
Owner ZHEJIANG UNIV
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