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Low-temperature SCR (Selective Catalytic Reduction) catalyst based on active coke loaded manganese-cerium composite oxide and preparation method of low-temperature SCR catalyst

A technology of SCR catalyst and active coke, which is applied in the field of low-temperature SCR catalyst and its preparation, can solve the problems of low-temperature SCR activity of active coke, difficulty in popularization, and high cost, so as to improve low-temperature SCR activity, maintain catalyst activity, and facilitate transportation and The effect of regeneration

Active Publication Date: 2013-12-11
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As an adsorption desulfurization material, activated coke itself also has certain low-temperature SCR activity, but compared with other low-temperature SCR catalysts, the low-temperature SCR activity of activated coke is very low. The operating cost of denitrification is very high and it is difficult to promote

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Soak 30 grams of activated coke 30-60 mesh particles in nitric acid with a volume concentration of 10% for 5 hours;

[0032] (2) Take out the active coke particles and rinse them with distilled water for 2 times, then filter and dry;

[0033] (3) Add 21.7 grams of cerium nitrate into 50 ml of distilled water, heat and stir until completely dissolved to form a solution, and mix with 37.8 grams of manganese nitrate solution with a mass percentage of 50% to obtain a mixed solution; (corresponding to the molar ratio of Mn:Ce is approximately: 1:0.37 )

[0034] (4) Dip the particles obtained in step 2 into the solution obtained in step 3 for immersion, first oscillate with ultrasonic waves for 10 minutes, and then immerse for 6 hours;

[0035] (5) Take out the particles in step 4, filter and dry them, then dry them at 60°C for 2 hours, and then dry them at 105°C for 5 hours;

[0036] (6) The particles obtained in step 5 were calcined at 500° C. for 6 hours under nitrog...

Embodiment 2

[0041] (1) Soak 30 grams of activated coke 30-60 mesh particles in nitric acid with a volume concentration of 10% for 5 hours;

[0042] (2) Take out the active coke particles and rinse them with distilled water for 2 times, then filter and dry;

[0043] (3) Add 1.44 grams of cobalt nitrate and 8.6 grams of cerium nitrate into 25ml of distilled water, heat and stir until completely dissolved, and mix with 8 grams of manganese nitrate solution with a mass percentage of 50% to obtain a mixed solution; (corresponding to a molar ratio of Mn:Ce:Co of about for 1:0.7:0.2)

[0044] (4) Dip the granules obtained in step 2 into the solution obtained in step 3 for immersion, first oscillate ultrasonically for 10 minutes, then immerse and leave for 6 hours;

[0045] (5) Take out the particles in step 4, filter and dry them, then dry them at 70°C for 2 hours, and then dry them at 105°C for 5 hours;

[0046] (6) The particles obtained in step 5 were calcined at 600° C. for 6 hours under n...

Embodiment 3

[0051] (1) Soak 30 grams of activated coke 30-60 mesh particles in nitric acid with a volume concentration of 15% for 5 hours;

[0052] (2) Take out the active coke particles and rinse them with distilled water for 2 times, then filter and dry;

[0053] (3) Add 4 grams of ferric nitrate and 8.6 grams of cerium nitrate into 25ml of distilled water, heat and stir until completely dissolved, and mix with 8 grams of manganese nitrate solution with a mass percentage of 50% to obtain a mixed solution; (corresponding to a molar ratio of Mn:Ce:Fe of about for: 1:0.7:0.35)

[0054] (4) Dip the particles obtained in step 2 into the solution obtained in step 3 for immersion, first oscillate with ultrasonic waves for 10 minutes, and then immerse for 6 hours;

[0055] (5) Take out the particles in step 4, filter and dry them, then dry them at 50°C for 2 hours, and then dry them at 105°C for 5 hours;

[0056] (6) The particles obtained in step 5 were calcined at 400° C. for 6 hours under ...

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Abstract

The invention provides a low-temperature SCR (Selective Catalytic Reduction) catalyst based on an active coke loaded active component and a preparation method of the low-temperature SCR catalyst. The catalyst is suitable for SCR reaction of nitrogen oxides under the condition of low temperature. A Mn and Ce composite oxide is loaded on an active coke particle with a relatively high special surface area and mechanical strength, so that the SCR reaction temperature is reduced, the adsorption capability and mechanical wear resistance of the catalyst are improved, and the whole sulfate resistance and regeneration capability of the catalyst are improved. The preparation method provided by the invention is simple in step, artful in process design and convenient for industrial production. The catalyst provided by the invention takes the active coke particle as a carrier on which the Mn and Ce composite oxide is loaded. Oxides of modified elements can also be loaded on the carrier of the catalyst, wherein the modified elements are selected from one or more of the following elements: Fe, Zr, Si, Ti, V, Mo, W, Cr, Au, Ag, Pt, Pd, Rh and Co.

Description

[0001] technical field [0002] The invention relates to a low-temperature SCR catalyst for removing NOx from flue gas and a preparation method thereof. In particular, active coke with strong sulfur dioxide adsorption capacity and high mechanical strength is used as a raw material, and while obtaining high low-temperature SCR activity, it has High sulfur dioxide adsorption capacity. Background technique [0003] Ammonia NH 3 As a reducing agent, selective catalytic reduction (SCR) NOx removal technology is currently the most widely used flue gas denitrification technology in thermal power plants. NH 3 , NO and O 2 Oxidation-reduction reactions occur under the action of catalysts to generate N 2 and H 2 O. The catalyst used is mainly V 2 o 5 / TiO 2 series, it has high catalytic activity, but its reaction temperature is relatively high, corresponding to the high temperature of thermal power plants in the use environment, high fly ash smoke, easy to cause wear and pois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/86B01D53/56
Inventor 胡宇峰刘建民王小明薛建明
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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