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Active coke-supported manganese-cerium composite oxide low-temperature SCR catalyst and preparation method thereof

A technology of SCR catalyst and activated coke, applied in the field of low-temperature SCR catalyst and its preparation, can solve the problems of low-temperature SCR activity of activated coke, high cost, difficult to popularize, etc., so as to improve the low-temperature SCR activity, which is beneficial to transportation, regeneration, and maintenance. The effect of catalyst activity

Active Publication Date: 2016-01-06
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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

[0030] (1) Soak 30 grams of activated coke 30-60 mesh particles in nitric acid with a volume concentration of 10% for 5 hours;

[0031] (2) Take out the active coke particles and rinse them with distilled water for 2 times, then filter and dry;

[0032] (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 )

[0033] (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;

[0034] (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;

[0035] (6) The particles obtained in step 5 were calcined at 500° C. for 6 hours under nitrog...

Embodiment 2

[0038] (1) Soak 30 grams of activated coke 30-60 mesh particles in nitric acid with a volume concentration of 10% for 5 hours;

[0039] (2) Take out the active coke particles and rinse them with distilled water for 2 times, then filter and dry;

[0040] (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)

[0041] (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;

[0042] (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;

[0043] (6) The particles obtained in step 5 were calcined at 600° C. for 6 hours under n...

Embodiment 3

[0046] (1) Soak 30 grams of activated coke 30-60 mesh particles in nitric acid with a volume concentration of 15% for 5 hours;

[0047] (2) Take out the active coke particles and rinse them with distilled water for 2 times, then filter and dry;

[0048] (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)

[0049] (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;

[0050] (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;

[0051] (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 catalyst based on active coke-loaded active components and a preparation method thereof. The catalyst is suitable for selective catalytic reduction of nitrogen oxides under low temperature conditions. By loading Mn and Ce composite oxides on active coke particles with high specific surface and mechanical strength, the temperature of SCR reaction can be reduced, the adsorption capacity and mechanical anti-wear ability of the catalyst can be improved, and the overall sulfation resistance of the catalyst can be improved. and regeneration capacity. The preparation method of the invention has simple steps, ingenious process design, and is convenient for realizing industrialized production. The catalyst of the invention uses active coke particles as a carrier, and Mn and Ce composite oxides are loaded on the carrier. The carrier of the catalyst can also be loaded with oxides of modifying elements, the modifying elements are: Fe, Zr, Si, Ti, V, Mo, W, Cr, Au, Ag, Pt, Pd, Rh, Co elements one or several.

Description

Technical field [0001] The present invention involves a low -temperature SCR catalyst and preparation method for the removal of NOX from flue gas, especially the use of active coke with high mechanical strength with high mechanical strength as raw materials for the use of high and low temperature SCR activity.Higher sulfur dioxide adsorption capacity. Background technique [0002] Use ammonia NH 3 As a reducing agent, selective catalytic reduction (SCR) removal of NOX technology is currently the most widely used thermal power plant flue denitration technology.Nh 3 , NO and O 2 Oxidation and reduction reaction generates N under the action of catalyst 2 H 2 O.The catalyst for its application is mainly v 2 O 5 / TIO 2 The series, it has a high catalytic activity, but its response temperature is high. The use environment corresponds to the high temperature of the fire power plant, high flying flue gas, and easily causes the wear and poisoning of catalysts. [0003] For the above reaso...

Claims

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Application Information

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Patent Type & Authority Patents(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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