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Novel iron-tungsten composite oxide denitration catalyst and preparation and application thereof

A composite oxide and denitrification catalyst technology, which is applied in the field of new iron-tungsten composite oxide denitration catalyst and its preparation and application, can solve the problem of low SCR activity and achieve improved catalytic activity, water resistance and sulfur resistance, high activity and high Effect

Active Publication Date: 2015-09-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but pure Fe 2 o 3 The SCR activity of SCR is not high, and it needs to be doped with a certain amount of other atoms to form a composite oxide, and its catalytic activity can be improved through the synergistic effect between them

Method used

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  • Novel iron-tungsten composite oxide denitration catalyst and preparation and application thereof
  • Novel iron-tungsten composite oxide denitration catalyst and preparation and application thereof
  • Novel iron-tungsten composite oxide denitration catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Fe 1 W 1 sample preparation

[0026] (1) Weigh 6.1911g Fe(NO 3 ) 3 9H 2 O and 2.0659g (NH 4 ) 6 W 7 o 24 ·6H 2 O mixed, dissolved in 30mL deionized water solution, stirred with a magnet, fully dissolved;

[0027] (2) the aqueous solution prepared in step (1) was stirred at room temperature for 30min;

[0028] (3) Under the agitation of the magnet, add ammonia solution dropwise to the solution obtained by mixing in step (2) until the precipitation is complete (pH reaches 8);

[0029] (4) Suction filter the material obtained in step (3), and then dry it in an oven at 100° C. for 3 to 4 hours to obtain a semi-finished product;

[0030] (5) Put the semi-finished product obtained in step (4) into the muffle furnace, -1 The temperature was raised to 500°C at a certain rate, and then kept at 500°C for 3 hours, and finally cooled naturally in the furnace to prepare a new type of iron-tungsten composite oxide denitration catalyst.

[0031] The catalyst is ...

Embodiment 2

[0032] Example 2 Fe 3 W 1 sample preparation

[0033] (1) Weigh 10.2291g Fe(NO 3 ) 3 9H 2 O and 1.1377g (NH 4 ) 6 W 7 o 24 ·6H 2 O mixed, dissolved in 30mL deionized aqueous solution, stirred with a magnet, fully dissolved;

[0034] (2) the aqueous solution prepared in step (1) was stirred at room temperature for 30min;

[0035] (3) Under the agitation of the magnet, add ammonia solution dropwise to the solution obtained by mixing in step (2) until the precipitation is complete (pH reaches 8);

[0036] (4) Suction filter the material obtained in step (3), and then dry it in an oven at 100° C. for 3 to 4 hours to obtain a semi-finished product;

[0037] (5) Put the semi-finished product obtained in step (4) into the muffle furnace, -1 The temperature was raised to 500°C at a certain rate, and then kept at 500°C for 3 hours, and finally cooled naturally in the furnace to prepare a new type of iron-tungsten composite oxide denitration catalyst.

[0038] The catalyst ...

Embodiment 3

[0039] Example 3 Fe 5 W 1 sample preparation

[0040] (1) Weigh 11.7637g Fe(NO 3 ) 3 9H 2 O and 0.7850g (NH 4 ) 6 W7 o 24 ·6H 2 O mixed, dissolved in 30mL deionized water solution, stirred with a magnet, fully dissolved;

[0041] (2) the aqueous solution prepared in step (1) was stirred at room temperature for 30min;

[0042] (3) Under the agitation of the magnet, add ammonia solution dropwise to the solution obtained by mixing in step (2) until the precipitation is complete (pH reaches 8);

[0043] (4) Suction filter the material obtained in step (3), and then dry it in an oven at 100° C. for 3 to 4 hours to obtain a semi-finished product;

[0044] (5) Put the semi-finished product obtained in step (4) into the muffle furnace, -1 The temperature was raised to 500°C at a certain rate, and then kept at 500°C for 3 hours, and finally cooled naturally in the furnace to prepare a new type of iron-tungsten composite oxide denitration catalyst.

[0045] The catalyst is a...

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Abstract

The invention discloses a novel iron-tungsten composite oxide denitration catalyst and its preparation and application and belongs to the technical field of environmental science and technology. The preparation comprises the following steps: respectively dissolving ferric salt and tungsten salt in deionized water, uniformly mixing, adding the mixture into an ammonia solution, stirring, carrying out suction filtration, drying and roasting. The preparation has the following advantages: oxides of iron and tungsten are uniformly mixed by a coprecipitation method; synergism of the two components guarantees the catalyst has high NOx conversion rate and wide temperature window; selectivity of N2 is higher than 90% in the overall temperature window; and the catalyst still has a very high activity in the presence of 200ppm SO2 and 5% H2O. The catalyst provided by the invention has a good catalytic activity and excellent water resistance and sulfur tolerance, and can be applied in efficient purification of NOx in a stationary source flue gas and diesel exhaust.

Description

technical field [0001] The invention belongs to the technical field of preparation of nitrogen oxide selective reduction catalysts in environmental protection, and relates to the purification of nitrogen oxides in fixed source flue gas and lean-burn vehicle exhaust, in particular to a novel iron-tungsten composite oxide denitrification catalyst and its preparation and application . Background technique [0002] Nitrogen oxides (NO x ) as an important precursor that causes a series of ecological and environmental problems such as acid rain, photochemical smog, and ozone layer depletion, which seriously threatens human health and ecological balance. At present, the elimination of nitrogen oxides from stationary and mobile sources has become a research hotspot in the field of environmental protection. Among them, ammonia selective catalytic reduction (SCR) nitrogen oxides has become the mainstream denitrification technology due to its high efficiency and mature advantages. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/90B01D53/56
Inventor 李俊华李想刘帅郝吉明
Owner TSINGHUA UNIV
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