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Adsorbent and preparation method and use thereof

An adsorbent and carrier technology, which is applied in the field of air pollution purification by adsorption technology, can solve the problems of complex process, large floor area, high cost, etc., and achieve the effect of high adsorption efficiency, simple operation and easy realization

Inactive Publication Date: 2012-02-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Separate removal of single component SO in coal-fired flue gas by adsorption method 2 , NO x and CO 2 However, there are few materials for adsorbing sulfur dioxide alone and their stability is poor. There is basically no systematic research on the removal of nitrogen oxides by adsorption. Stable Renminbi is a Difficulty in Research
Considering the disadvantages of multi-step purification and treatment of various pollutants in flue gas, such as complicated process, high cost, and large floor area, the present invention plans to develop and utilize an adsorbent to simultaneously adsorb and remove the above three components in flue gas, In order to meet the requirements of flue gas purification, simplify the treatment process, and realize waste utilization and other purposes

Method used

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  • Adsorbent and preparation method and use thereof
  • Adsorbent and preparation method and use thereof
  • Adsorbent and preparation method and use thereof

Examples

Experimental program
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Effect test

example 1

[0028] Clean the 13X molecular sieve three times with deionized water, put it in an oven at 110°C for 1 day, then place it in a muffle furnace at room temperature at a temperature increase rate of 1°C / min to 400°C, roast at 400°C for 8 hours, then The adsorbent is obtained when it is lowered to room temperature.

[0029] Place 4g of activated 13X molecular sieve in a 70°C reactor and pass in coal-fired flue gas with a flue gas flow rate of 300 mL / min and SO in the flue gas 2 , NO X And CO 2 The concentrations are 2300ppm, 1100ppm and 11%.

[0030] Monitor the flue gas concentration after purification in real time, and calculate the SO in the flue gas 2 , NO X And CO 2 Purification efficiency, see figure 1 Shown. The desulfurization efficiency is greater than 96%, the denitration efficiency is greater than 12%, and the decarbonization efficiency drops rapidly. In the first 3 minutes, the desulfurization, denitrification and decarbonization efficiencies were maintained at 98%, 25% a...

example 2

[0032] Clean the 5A molecular sieve with deionized water three times, put it in an oven at 110°C for 1 day, then place it in a muffle furnace at room temperature at a heating rate of 1°C / min to 400°C, roast at the highest temperature for 8 hours, then The adsorbent is obtained when it is lowered to room temperature.

[0033] Put 5g of activated 5A molecular sieve in a 50℃ reactor, and pass in coal-fired flue gas. The flue gas flow rate is 500mL / min. The flue gas contains SO 2 , NO X And CO 2 The concentrations are 2200ppm, 958ppm and 7.7% respectively.

[0034] Monitor the flue gas concentration after purification in real time, and calculate the SO in the flue gas 2 , NO X And CO 2 The purification efficiency, get the purification efficiency, such as figure 2 As shown, the efficiency of desulfurization, denitrification, and decarburization decreased rapidly. The desulfurization, denitrification, and decarburization efficiencies in the first 3 minutes were 67%, 25%, and 3.8%, respec...

example 3

[0036] Add 20g of 13X molecular sieves to 200ml of 1mol / L potassium chloride solution with a solid-liquid ratio of 1:10. Stir for 24 hours at a water bath temperature of 60°C for ion exchange. After repeated washing with deionized water, place it in an oven at 110°C for drying. Day; Put the dried sample in a muffle furnace at room temperature at a heating rate of 1°C / min to raise the temperature to 400°C, and calcine at 400°C for 24 hours. The entire calcination process atmosphere is protected by nitrogen and the nitrogen flow rate is 100mL / min. Finally, the carrier is naturally cooled to room temperature to obtain the desired adsorbent.

[0037] Place 10g of the prepared modified molecular sieve in a 90℃ reactor, and pass in coal-fired flue gas at a flow rate of 300 mL / min, and SO in the flue gas 2 , NO X And CO 2 The concentrations are 2800ppm, 980ppm and 9.2% respectively.

[0038] Monitor the flue gas concentration after purification in real time, and calculate the SO in the fl...

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Abstract

The invention discloses an adsorbent capable of simultaneously adsorbing and removing SO2, NOx and CO2 from coal-fired flue gas, and a preparation method and use thereof. In the preparation of the adsorbent, faujasite (X type and Y type), LTA (lipoteichoicacid) type zeolite, mordenite or a ZSM-5 (zeolite molecular sieve) molecular sieve is used as an adsorption carrier, and the carrier is put in solutions, such as a lithium chloride solution, a potassium chloride solution and the like for ion exchange; then, the carrier is cleaned and dried; and finally, the carrier is put in a muffle furnace for roasting so as to prepare the required adsorbent. In the use of the adsorbent, the adsorbent is applied to removing the SO2, the NOx and the CO2 from the coal-fired flue gas so as to reach the aim of purifying the flue gas. With the adoption of the adsorbent disclosed by the invention, the simultaneous removal of a plurality of pollutants from flue gases is realized, the adsorption efficiency is high, and the operation is simple; and the preparation method of the adsorbent is mature and stable, convenient and simple, and easy to realize.

Description

technical field [0001] The invention relates to an adsorbent, in particular to an adsorbent for simultaneously removing sulfur dioxide, nitrogen oxides and carbon dioxide in coal-fired flue gas, a preparation method and application thereof, and belongs to the technical field of application of adsorption technology to air pollution purification. technical background [0002] by SO 2 and nitrogen oxides (NO X ) and other acid-causing substances caused by acid rain and CO 2 The greenhouse effect caused by greenhouse gases such as greenhouse gases is a global atmospheric environmental problem that is widely concerned in the world. 70% of carbon dioxide emissions, 90% of sulfur dioxide emissions and 67% of nitrogen oxide emissions in the air come from the use of fossil fuels. In view of the fact that coal is the main primary energy consumption in my country, the control of coal-fired flue gas emissions has become the key to protecting the atmospheric environment. [0003] Sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01D53/04
Inventor 易红宏邓华唐晓龙刘海艳周璇
Owner KUNMING UNIV OF SCI & TECH
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