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Denitration catalyst containing tungsten-tin-manganese-cerium composite oxide as well as preparation and application of denitration catalyst

A composite oxide and denitrification catalyst technology, which is applied in the field of tungsten-tin-manganese-cerium composite oxide denitration catalyst and its preparation and application, can solve the problems of poor sulfur resistance, impact, and reduced nitrogen selectivity, etc., to improve water resistance and sulfur resistance resistance, high tolerance, and the effect of improving nitrogen selectivity

Active Publication Date: 2016-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current Sn 0.1 mn 0.4 Ce 0.5 o y The catalyst achieved a good low-temperature catalytic effect, but a large amount of N was still produced during the catalytic process. 2 O, thereby reducing the nitrogen selectivity of the reaction, and its sulfur resistance is poor, affecting its practical application

Method used

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  • Denitration catalyst containing tungsten-tin-manganese-cerium composite oxide as well as preparation and application of denitration catalyst
  • Denitration catalyst containing tungsten-tin-manganese-cerium composite oxide as well as preparation and application of denitration catalyst
  • Denitration catalyst containing tungsten-tin-manganese-cerium composite oxide as well as preparation and application of denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] W 0.3 sn 0.1 mn 0.4 Ce 0.5 o y sample preparation

[0029] (1) Take by weighing 4.044g ammonium metatungstate, 1.753g stannous chloride, 3.579g manganese nitrate solution (50%), 10.856g cerium nitrate hexahydrate for subsequent use;

[0030] (2) Weigh 4.044g oxalic acid, dissolve oxalic acid and ammonium metatungstate in 50mL deionized water;

[0031] (3) dissolving the weighed cerium nitrate hexahydrate in a small amount of deionized water;

[0032] (4) After (2) and (3) are completely dissolved, sequentially add the tin salt and manganese salt solutions weighed in (1) to (2), and add (3) to the system drop by drop;

[0033] (5) Measure about 50 mL of ammonia water and add it dropwise to the solution obtained in (4), so that the pH value in the final system is 10±0.5, and stir and age at room temperature for about 2 hours;

[0034] (6) After stopping stirring in (5), let it stand for 2 to 4 hours to allow the precipitated grains to aggregate and grow;

[0035] ...

Embodiment 2

[0039] W 0.2 sn 0.1 mn 0.4 Ce 0.5 o y sample preparation

[0040] (1) Take by weighing 2.696g ammonium metatungstate, 1.753g stannous chloride, 3.579g manganese nitrate solution (50%), 10.856g cerium nitrate hexahydrate for subsequent use;

[0041] (2) Weigh 2.696g of oxalic acid, and dissolve oxalic acid and ammonium metatungstate in 50mL of deionized water;

[0042] (3) dissolving the weighed cerium nitrate hexahydrate in a small amount of deionized water;

[0043] (4) After (2) and (3) are completely dissolved, sequentially add the tin salt and manganese salt solutions weighed in (1) to (2), and add (3) to the system drop by drop;

[0044] (5) Measure about 50 mL of ammonia water and add it dropwise to the solution obtained in (4), so that the pH value in the final system is 10±0.5, and stir and age at room temperature for about 2 hours;

[0045] (6) After stopping stirring in (5), let it stand for 2 to 4 hours to allow the precipitated grains to aggregate and grow; ...

Embodiment 3

[0050] W 0.1 sn 0.1 mn 0.4 Ce 0.5 o y sample preparation

[0051] (1) Take by weighing 1.348g ammonium metatungstate, 1.753g stannous chloride, 3.579g manganese nitrate solution (50%), 10.856g cerium nitrate hexahydrate for subsequent use;

[0052] (2) Weigh 1.348g oxalic acid, dissolve oxalic acid and ammonium metatungstate in 50mL deionized water;

[0053] (3) dissolving the weighed cerium nitrate hexahydrate in a small amount of deionized water;

[0054] (4) After (2) and (3) are completely dissolved, sequentially add the tin salt and manganese salt solutions weighed in (1) to (2), and add (3) to the system drop by drop;

[0055] (5) Measure about 50 mL of ammonia water and add it dropwise to the solution obtained in (4), so that the pH value in the final system is 10±0.5, and stir and age at room temperature for about 2 hours;

[0056] (6) After stopping stirring in (5), let it stand for 2 to 4 hours to allow the precipitated grains to aggregate and grow;

[0057] ...

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PUM

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Abstract

A denitration catalyst containing a tungsten-tin-manganese-cerium composite oxide contains active components including WO3, MnO2, SnO2 and CeO2; the chemical formula of the catalyst is WxSn0.1Mn0.4Ce0.5Oy, wherein x is equal to the quotient obtained by dividing W by the sum of Sn, Mn and Ce, and x is equal to 0.1, 0.2 or 0.3. The invention also provides a preparation method of the denitration catalyst containing the tungsten-tin-manganese-cerium composite oxide, and the prepared denitration catalyst containing the tungsten-tin-manganese-cerium composite oxide can be used for removing NOx contained in flue gas in a fixed stationary source and motor vehicle exhaust. Compared with the prior art, the denitration catalyst has the advantages of non-toxicity, high activity, high selectivity, high SO2 tolerability and the like; the NOx conversion rate is increased and the nitrogen selectivity of the catalyst is improved through mutual synergistic effect of four elements including W, Sn, Mn and Ce and mutual influence of oxidation-reduction properties of the four elements; the denitration catalyst containing the tungsten-tin-manganese-cerium composite oxide has better activity and selectivity in the test range from 120 DE GC to 300 DEG C and has higher tolerability to SO2 and H2O.

Description

technical field [0001] The invention belongs to the technical field of purification treatment of nitrogen oxides in the field of environmental protection technology, and the designed object to be treated is nitrogen oxides contained in fixed source flue gas and motor vehicle (diesel vehicle) exhaust gas, and particularly relates to a tungsten-tin-manganese-cerium compound Oxygen denitrification catalyst and its preparation and application. Background technique [0002] Stationary source flue gas and motor vehicle (diesel vehicle) exhaust contain a large amount of nitrogen oxides (NO x ), not only affect the ecological environment, but also have great harm to the human body. In terms of the environment, nitrogen oxides are one of the culprits causing a series of ecological and environmental problems such as acid rain, photochemical smog, and ozone layer destruction; the damage to the human body is mainly reflected in the respiratory tract and lungs, and it will damage the lu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/94B01D53/56
CPCB01D53/8628B01D53/9413B01D2258/012B01D2258/0283B01J23/002B01J23/34B01J2523/00B01J2523/72B01J2523/69B01J2523/43B01J2523/3712
Inventor 李俊华邱枫张涛
Owner TSINGHUA UNIV
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