Preparation method of doped CO2 (carbon dioxide) calcium base adsorbent

A calcium-based adsorbent, CO2 technology, which is applied in the field of preparation of doped CO2 calcium-based adsorbent, can solve the problems of poor cycle adsorption stability, low conversion rate and high cost, and achieves improvement of calcium-based cycle adsorption performance, reduced cost, and low cost. Inexpensive, improve the effect of easy sintering

Active Publication Date: 2018-09-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used is doping inert support materials, such as doping MgO, Al 2 o 3 , ZrO 2 etc. However, doping with these substances has disadvantages such as poor cycle adsorption stability, low conversion rate, and high cost.

Method used

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  • Preparation method of doped CO2 (carbon dioxide) calcium base adsorbent
  • Preparation method of doped CO2 (carbon dioxide) calcium base adsorbent
  • Preparation method of doped CO2 (carbon dioxide) calcium base adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Without doping, directly use the calcium source extracted from calcium carbide slag as the CaO precursor to prepare CO 2 Calcium-based adsorbent, the specific steps are as follows:

[0032] Weigh 5g of calcium carbide slag to clean and remove impurities attached to the surface, dry it in an oven for 4 hours, and then crush it with a high-grade crusher; place the obtained material in a muffle furnace at a temperature of 900°C for 4 hours and calcinate to obtain a calcium-based adsorbent prepared from calcium carbide slag.

[0033] The composition table of the calcined carbide slag measured by XRF (output in the form of oxides) is shown in Table 1 below; the results show that the content of CaO in the calcined carbide slag is as high as 85.12wt%, and it also contains The component MgO.

[0034] Table 1 Composition list of calcium carbide slag after calcination

[0035]

[0036] The resulting product was placed in a thermogravimetric analyzer for cycling CO 2 Adsorpt...

Embodiment 2

[0041] Without doping, the calcium source extracted from egg shells was directly used as the CaO precursor to prepare CO 2 Calcium-based adsorbent, the specific steps are as follows:

[0042] Weigh 5g of egg shells, wash and remove impurities attached to the surface, bake in an oven for 3 hours, then crush them with a high-grade crusher, and place the resulting material in a muffle furnace at a temperature of 900°C for 5 hours to obtain a calcium-based adsorbent prepared from calcium carbide slag .

[0043] The resulting product was placed in a thermogravimetric analyzer for cycling CO 2 Adsorption investigation.

[0044] CO 2 The cycle adsorption performance test method is the same as in Example 1, and the results show that the first adsorption CaO conversion rate is 55.31%, and after 10 times of CO 2 The conversion of CaO after adsorption / desorption cycles was 32.76%.

Embodiment 3

[0046] A doped CO 2 The preparation method of calcium-based adsorbent specifically comprises the following steps:

[0047] (1) At room temperature, weigh Li according to the molar ratio of lithium and silicon n(Li):n(Si) is 4.5:1 2 CO 3 and SiO 2 , then put it into a mortar, add an appropriate amount of water to make it fully mixed, and dry it in an oven at 50°C after mixing;

[0048] (2) Put the dried mixture obtained in step (1) into a crucible, and bake it in a muffle furnace at 600°C for 5 hours;

[0049] (3) Put the sample obtained in step (2) into a mortar and grind for 5 minutes to obtain Li 4 SiO 4 powder;

[0050] (4) Take a certain amount of waste calcium carbide slag, wash and remove impurities attached to the surface, bake in an oven for 3 hours, then crush it with a high-grade crusher, and then put it in a muffle furnace for calcination at 800°C for 3 hours to extract calcium base;

[0051] (5) the dopant Li obtained in step (3) 4 SiO 4 Powder and step (4...

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Abstract

The invention discloses a preparation method of a doped CO2 (carbon dioxide) calcium base adsorbent. The preparation method comprises the following steps of using waste as a precursor for calcium base, cleaning, crushing, calcining, and extracting, wherein a doping agent Li4SiO4 is prepared from raw materials of Li2CO3 (lithium carbonate) and fly ash or SiO2 (silicon dioxide) by a high-temperaturesolid-phase method; adsorbent prepared by the process that the doping agent Li2SiO4 and the calcium base are mixed and pre-calcined obviously improves the CO2 cycle adsorbing conversion rate and stability; the modifying of the calcium base adsorbent by the doping agent Li2SiO4 is put forwards for the first time. The preparation method has the advantages that after Li2SO4 doping, the phase is changed after pre-calcining to support the structure of the calcium base adsorbent, and prevent the sintering; the operation of the preparation process is simple, the CO2 adsorbing property of the prepared doped calcium base adsorbent is good, and the development prospect is better.

Description

technical field [0001] The invention relates to a doped CO 2 Preparation method of calcium-based adsorbent, belonging to CO 2 High temperature adsorption and separation field. Background technique [0002] CO released from fossil fuel combustion 2 It is considered to be the chief culprit of the greenhouse effect, and the climate change caused by the greenhouse effect has always been an issue of global concern. Relatively speaking, effective control of CO 2 Emissions have become an important topic for researchers. It is understood that the energy industry is a CO 2 The main source of emissions, emitted CO 2 High temperature. To reduce CO 2 For emission, researchers have proposed methods such as adsorption, membrane separation, and ammonia water absorption, but these methods are not widely used due to the disadvantages of complex operation, low adsorption performance, and high consumption. Calcium-based adsorbent has a large adsorption capacity and can realize CO 2 Se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30B01D53/02
CPCB01D53/02B01J20/04B01J20/041B01D2257/504Y02C20/40
Inventor 陕绍云张亚芹贾庆明苏红莹
Owner KUNMING UNIV OF SCI & TECH
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