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Surface coating modified nano calcium oxide based CO2 adsorbing agent and preparation method thereof

A nano-calcium oxide, surface coating technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problems of no reported coating, low adsorption efficiency, long synthesis time, etc., and achieve good microstructure performance. , the method is simple, the effect of modification stability

Active Publication Date: 2014-08-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-based adsorbents are still insufficient in the following aspects: the synthesis time of materials is long, the temperature is high, the adsorption efficiency is low, and the capacity is small.
The growth of crystal nuclei can be limited by controlling the size of the adsorption layer, which provides a relatively simple method for controlling the particle size and distribution of nanoparticles, but it is mainly used for surface SiO 2 Coating, there is no report for nano-CaCO 3 surface coating

Method used

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  • Surface coating modified nano calcium oxide based CO2 adsorbing agent and preparation method thereof
  • Surface coating modified nano calcium oxide based CO2 adsorbing agent and preparation method thereof
  • Surface coating modified nano calcium oxide based CO2 adsorbing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Disperse 19 g of nanometer calcium carbonate dry powder and 10 g of water in absolute ethanol by an ultrasonic disperser to form a suspension.

[0061] (2) Add 57g of 3A molecular sieve to the above suspension, leave it to stand for 30 minutes to remove water, filter out the molecular sieve, and obtain a dehydrated suspension.

[0062] (3) Add 2.8g KOH to the dehydrated suspension, and stir evenly.

[0063] (4) 5.1g MgCl 2 ·6H 2 After O was dissolved in absolute ethanol, it was gradually added to the mixed solution obtained in step (3), and stirring was continued at room temperature 25°C for 2 hours.

[0064] (5) Suction filtration, after washing, disperse the filter cake in water to obtain a coated modified nano calcium carbonate slurry, the dry basis of which contains Mg(OH) 2 The content is 5%, and the content of nano calcium carbonate is 95%.

[0065] (6) According to the ratio of nano calcium carbonate 85: aluminum sol 15, add 0.5g sodium hexametaphosphate, add an approp...

Embodiment 2

[0069] (1) Disperse 53 g of nano-calcium carbonate with 70% water content in absolute ethanol with an ultrasonic disperser to form a suspension.

[0070] (2) Add 5.3 g of activated carbon to the above suspension, stand for 30 minutes to remove water, filter out the molecular sieve, and obtain a dehydrated suspension.

[0071] (3) Add 8g of NaOH to the dehydrated suspension, and keep stirring at 50°C for 2h.

[0072] (4) 25.6g Mg(NO 3 ) 2 ·6H 2 After O was dissolved in absolute ethanol, it was gradually added to the mixed solution obtained in step (3), and stirring was continued at a temperature of 50°C for 4 hours.

[0073] (5) Suction filtration, disperse the filter cake in water after washing to obtain a coated modified nano calcium carbonate slurry, the dry basis of which contains Mg(OH) 2 The content is 20% and the content of nano calcium carbonate is 80%.

[0074] (6) According to the ratio of nano calcium carbonate 75: aluminum sol 25, add 0.8 g of sodium lauryl benzoic acid, add ...

Embodiment 3

[0076] (1) Disperse 35 g of nano calcium carbonate with 50% water content in absolute ethanol with an ultrasonic disperser to form a suspension.

[0077] (2) Add 18g of 3A molecular sieve to the above suspension, leave it to stand for 30 minutes to remove water, filter out the molecular sieve, and obtain a dehydrated suspension.

[0078] (3) Add 4.8 g of NaOH to the dehydrated suspension, and stir evenly at a temperature of 70°C.

[0079] (4) 12.2g MgCl 2 ·6H 2 After O was dissolved in absolute ethanol, it was gradually added to the mixed solution obtained in step (3), and stirring was continued at a temperature of 70°C for 4 hours.

[0080] (5) Suction filtration, disperse the filter cake in water after washing to obtain a coated modified nano calcium carbonate slurry, the dry basis of which contains Mg(OH) 2 The content is 12% and the content of nano calcium carbonate is 88%.

[0081] (6) According to the ratio of nano calcium carbonate 80: aluminum sol 20, add 0.6g stearic acid polye...

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Abstract

The invention discloses a surface coating modified nano calcium oxide based CO2 adsorbing agent which is composed of internal nano calcium oxide and an external surface coating layer; the surface coating layer is prepared from at least one of Al2O3, Ca12Al14O33 and MgO. The invention further discloses a preparation method of the surface coating modified nano calcium oxide based CO2 adsorbing agent. An adsorption phase reaction method is utilized, and thickness and uniformity of the surface coating layer are controlled by controlling a reaction field, the method is simple and regulation and control are facilitated; according to the invention, the prepared surface coating modified nano calcium oxide based CO2 adsorbing agent has high CO2 adsorption capacity and obvious stability in adsorption ability in manifold cycles, can be in long-term recycling, and is an ideal adsorption agent in the adsorption process of high-temperature CO2.

Description

Technical field [0001] The invention relates to the field of environmental energy saving and emission reduction and CO 2 The field of hydrogen production enhanced by reactive adsorption, specifically relates to a surface-coated modified nano-calcium oxide-based CO 2 Adsorbent and its preparation method. Background technique [0002] The energy consumption of human activities brings about greenhouse gas emissions. Fossil fuel thermal power plants are CO 2 The main source of emissions, which accounts for about 1 / 3 of the total anthropogenic emissions, is currently reducing CO 2 The measure of emissions is the CO produced after burning fossil fuels 2 Carry out capture, storage and utilization, so as to achieve the purpose of effective emission reduction. Commonly used to capture CO 2 The methods include absorption separation method, adsorption separation method, [0003] Membrane separation methods, etc., these methods are generally carried out at a lower temperature, so it is necess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30B01D53/02
CPCY02C20/40
Inventor 吴素芳王燕薛孝宠
Owner ZHEJIANG UNIV
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