High-activity nano-grade flue gas denitrification catalyst and low-temperature liquid-phase preparation method thereof

A denitration catalyst and nano-scale technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of easily destroying the microstructure of catalysts, increasing energy consumption in industrial production, etc., to improve catalytic reaction activity, The effect of increasing density, improving dispersion and bonding strength

Active Publication Date: 2013-06-05
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst used is mainly V 2 o 5 /TiO 2 series, it has high catalytic activity, and high-temperature roasting process needs to be introduced in the preparation process, which increases the ener

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve 200 grams of titanium sulfate crystals in 500ml of water, and add 200ml of 20% ammonia water dropwise to obtain white Ti(OH) 4 Precipitate, after the precipitation is complete, filter and wash the precipitate with water to remove Ti(OH) 4 Sulfate ion in white precipitate.

[0028] (2) Use 350ml of nitric acid with a concentration of 40% to completely dissolve the above white precipitate to obtain a solution;

[0029] (3) Take 3.1 grams of potassium permanganate KMnO 4 and 4.2 g of manganese acetate Mn(CH 3 COO) 2 Separately added to 200ml of water, electromagnetic stirring until completely dissolved to form a solution. 10.8 grams of cerium nitrate crystals were dissolved in 150ml of water, and Mn(CH 3 COO) 2 solution, after stirring evenly, and then KMnO 4 Slowly add the solution, under the condition of stirring at 120r / min, slowly add the solution obtained in step (2), react for 8 hours, slowly drop 5% ammonia water in the reaction process to keep t...

Embodiment 2

[0033] (1) Dissolve 80 grams of titanyl sulfate in 500ml of water, and add 200ml of 20% ammonia water dropwise to obtain white Ti(OH) 4 Precipitation, after the precipitation is complete, filter and wash with water to remove sulfate ions. Dissolve the white precipitate completely with 350ml of 20% nitric acid;

[0034] (2) Take 3.1 grams of potassium permanganate KMnO 4and 4.2 g of manganese acetate Mn(CH 3 COO) 2 Separately added to 200ml of water, electromagnetic stirring until completely dissolved to form a solution. 10.8 grams of cerium nitrate crystals were dissolved in 150ml of water, and Mn(CH 3 COO) 2 solution, after stirring evenly, the KMnO 4 Slowly add the solution, under the condition of stirring at 120r / min, slowly add the solution obtained in step (1), react for 8 hours, slowly drop 5% ammonia water in the reaction process to keep the pH value of the solution at 7-9, and finally form a precipitate;

[0035] (3) Filter the obtained precipitate, rinse it wit...

Embodiment 3

[0038] (1) Dissolve 95 grams of titanium tetrachloride in 500ml of water (ice water bath), add 200ml of 10% ammonia water dropwise to obtain white Ti(OH) 4 Precipitation, after the precipitation is complete, filter and wash to remove chloride ions. Dissolve the white precipitate completely with 350ml of 20% nitric acid;

[0039] (2) Take 3.1 grams of potassium permanganate KMnO 4 and 4.2 g of manganese acetate Mn(CH 3 COO) 2 Separately added to 200ml of water, electromagnetic stirring until completely dissolved to form a solution. 10.8 grams of cerium nitrate crystals were dissolved in 150ml of water, and Mn(CH 3 COO) 2 solution, after stirring evenly, the KMnO 4 Slowly add the solution, under the condition of stirring at 130r / min, slowly add the solution obtained in (1), react for 8 hours, slowly drop 5% ammonia water in the reaction process to keep the pH value of the solution at 7-9, and finally form a precipitate;

[0040] (3) Filter the resulting precipitate, rinse...

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PUM

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Abstract

The invention provides a high-activity nano-grade flue gas denitrification catalyst for removing nitric oxides in fuel gas under a low temperature condition, and a low-temperature liquid-phase preparation method of the high-activity nano-grade flue gas denitrification catalyst. The method does not relate to high-temperature roasting; and the prepared catalyst exists in a manner of a lot of amorphous state mixed oxides, and the activity is obviously improved. The high-activity nano-grade flue gas denitrification catalyst can be widely applied to selective catalytic reduction reaction of the fuel gas under an SO2-free or low-concentration SO2 environment of the fuel gas, so as to reduce the nitric oxides in the fuel gas into N2 and H2O. The catalyst takes a Ti oxide as a main component and is at least loaded with Mn-Ce-M-Ti-Ox of compound oxides of active components Mn and Ce, wherein M represents one or more elements of Fe, Co, Cu, Cr, Zr, Al and V; and the mol ratio of the elements is as follows: Ti: Mn: Ce: M is equal to 1: (0.005-1): (0.005-1): (0-0.3).

Description

technical field [0001] The invention relates to a low-temperature SCR catalyst for removing NOx from flue gas and a preparation method thereof, especially avoiding the high-temperature roasting process in the preparation process of the low-temperature SCR catalyst, effectively improving the specific surface area of ​​the catalyst and reducing the crystallinity of the catalyst, so that the catalyst It exists in the form of a large number of amorphous mixed oxides, which effectively increases the density of active sites on the surface of the catalyst. Background technique [0002] Currently, using ammonia NH 3 As a reducing agent, selective catalytic reduction (SCR) NOx removal technology is the most widely used flue gas denitrification technology. 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, and high-temperature roasting...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/889B01D53/90B01D53/56
Inventor 胡宇峰薛建明王小明
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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