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Transition metal oxide composite catalyst, preparation method thereof and application of catalyst

A composite catalyst and transition metal technology, which is applied in the field of flue gas denitrification and catalyst, can solve the problems of high cost and increased catalyst cost, and achieve enhanced stability, improved removal rate and nitrogen selectivity, overall stability and sulfur resistance. Excellent effect on water performance

Inactive Publication Date: 2019-02-19
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 106111135 A discloses a low-temperature sulfur-resistant vanadium-titanium denitrification catalyst. The catalyst is prepared by an impregnation method, and anatase-type titanium dioxide is used as a carrier, and vanadium pentoxide, tungsten trioxide and ruthenium are supported on its surface. Although the temperature window range is expanded to a certain extent and the poisonous effect of sulfur is weakened, the addition of noble metal ruthenium increases the cost of the catalyst. At the same time, tungsten is also a scarce resource, resulting in a higher cost.

Method used

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  • Transition metal oxide composite catalyst, preparation method thereof and application of catalyst
  • Transition metal oxide composite catalyst, preparation method thereof and application of catalyst
  • Transition metal oxide composite catalyst, preparation method thereof and application of catalyst

Examples

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preparation example Construction

[0055] The preparation method of described catalyst comprises:

[0056] (1) Add slow-release precipitant to the mixed solution of iron source, vanadium source and titanium source, and react to obtain solid precipitate;

[0057] (2) Calcining the solid precipitate obtained in step (1) to obtain the transition metal oxide composite catalyst.

Embodiment 1

[0060] This example provides a transition metal oxide composite catalyst and its preparation method. The catalyst includes an iron-vanadium composite oxide active component and a titanium dioxide carrier, wherein the molar ratio of iron, vanadium and titanium is 0.1:0.1:1.

[0061] The preparation method of described catalyst comprises:

[0062] (1) Prepare a solution with ammonium metavanadate as a vanadium source, add oxalic acid to promote dissolution, then add iron nitrate and titanium sulfate to the ammonium metavanadate solution, stir and dissolve to obtain a mixed solution, wherein ammonium metavanadate, iron nitrate, sulfuric acid The molar ratio of titanium is 0.1:0.1:1. Add urea to the mixed solution. The molar number of urea is 10 times the total molar number of ammonium metavanadate, ferric nitrate and titanium sulfate. React for 12 hours in a water bath at 90°C, filter Separated to obtain a solid precipitate;

[0063] (2) Dry the solid precipitate obtained in ste...

Embodiment 2

[0071] This example provides a transition metal oxide composite catalyst and its preparation method. The catalyst includes an iron-vanadium composite oxide active component and a titanium dioxide carrier, wherein the molar ratio of iron, vanadium and titanium is 0.05:0.05:1.

[0072] The preparation method of described catalyst comprises:

[0073] (1) Take vanadyl oxalate as the vanadium source preparation solution, add oxalic acid to promote dissolution, then add ferric chloride and titanium tetrachloride to the vanadyl oxalate solution, stir and dissolve to obtain a mixed solution, wherein vanadyl oxalate, ferric chloride, The molar ratio of titanium tetrachloride is 0.05:0.05:1. Add ammonium carbonate to the mixed solution. The molar number of ammonium carbonate is 15 times the total molar number of vanadyl oxalate, ferric chloride and titanium tetrachloride. Reacted for 16 hours under water bath conditions, separated by filtration to obtain a solid precipitate;

[0074] (...

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Abstract

The invention provides a transition metal oxide composite catalyst, a preparation method thereof and an application of the catalyst. The catalyst comprises a transition metal oxide active component and a carrier, and the transition metal oxide comprises an iron and vanadium composite oxide. According to the catalyst, iron is led in a vanadium and titanium denitration catalyst, the operating temperature of the catalyst can be widened to 200-450 DEG C by the aid of interaction between the iron and the vanadium and combination between an active site and an acid site of the carrier, denitration efficiency is improved, the conversion rate of NOx within the temperature range reaches 80% or more, generating selectivity of N2 is good, stability, sulfur resistance and water resistance of the catalyst can be enhanced, and the catalyst is low in cost, simple and easy in preparation process and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a transition metal composite catalyst and its preparation method and application, in particular to a transition metal composite catalyst, its preparation method and its application in the field of flue gas denitrification. Background technique [0002] Nitrogen oxides (NO x ) as a common gaseous pollutant is an important cause of photochemical smog. It has become an important air pollutant second only to inhalable particulate matter and sulfur dioxide. NO emissions from stationary sources represented by gas and mobile sources represented by diesel vehicle exhaust x accounts for about 60% of emissions. Therefore, many flue gas denitrification technologies have developed rapidly in recent years, and selective catalytic reduction of ammonia (NH 3 -SCR) technology has received extensive attention due to its advantages of maturity, reliability, high efficiency, and good selectivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01D53/86B01D53/56
CPCB01D53/8628B01J23/8472
Inventor 贺泓朱娜单文坡连志华张燕
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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