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Catalyst for low-temperature denitration of flue gas and preparation method thereof

A low-temperature flue gas and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as low activity and no breakthrough progress, and achieve increased active sites and low-temperature denitrification activity Improve and increase the effect of oxygen vacancies

Inactive Publication Date: 2009-07-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vanadium / titanium catalyst has excellent denitrification performance, anti-sulfur dioxide and water poisoning performance at medium temperature, and has good thermal and mechanical stability, but its activity is very low at low temperature. At present, researchers at home and abroad have carried out A lot of experimental research, but no breakthrough has been made

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The catalyst for low-temperature flue gas denitrification produced according to the present invention has the mass percentages of each component: 0.32 fluorine, 0.30 vanadium, 59.67 titanium, and the rest is oxygen. Its concrete preparation steps are as follows:

[0017] (1) Preparation of titanium oxide carrier by sol-gel method:

[0018] Mix a certain amount of butyl titanate and acetylacetone, stir, then add absolute ethanol (precursor dissolved in a certain amount of fluorine according to the above ratio), and stir for 2 hours to obtain a titanium sol; after concentrating in a water bath at 60°C, Dry at 120°C for 6 hours, and finally calcinate in air at 500°C for 3 hours; sieve to 20-26 mesh for later use.

[0019] (2) Loading the active component vanadium oxide to the titanium oxide carrier by impregnation method:

[0020] First, the ammonium metavanadate solution was prepared by using ammonium metavanadate, a precursor of vanadium, and a certain amount of ammoni...

Embodiment 2

[0022] The catalyst for denitrification of low-temperature flue gas made according to the present invention has the mass percent content of each component: 0.12 fluorine, 0.30 vanadium, 59.69 titanium, and the rest is oxygen. The specific preparation steps are the same as in Example 1, except that when preparing the carrier, the titanium sol is concentrated in a 60°C water bath, dried at 100°C for 6 hours, and finally calcined in air at 400°C for 4 hours.

Embodiment 3

[0024] The catalyst for low-temperature flue gas denitrification produced according to the present invention has the mass percentages of each component: 0.47 fluorine, 0.30 vanadium, 59.66 titanium, and the rest is oxygen. The specific preparation steps are the same as in Example 1, except that when preparing the carrier, the titanium sol was concentrated in a 60°C water bath, dried at 100°C for 10 hours, and finally calcined in air at 400°C for 4 hours.

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Abstract

The invention discloses a catalyst for low-temperature flue gas denitration, and a preparation method thereof. The method adopts a selective catalytic reduction (SCR) technique, takes vanadium oxide as an active component and titanium oxide as a carrier, and substitutes fluorine for partial oxygen in an oxide catalyst, so as to prepare the catalyst, wherein the vanadium oxide as the active component is loaded on the carrier by an impregnation method; the titanium oxide as the carrier is prepared by a sol-gel method; and the substitution of fluorine for oxygen can be carried out when the titanium oxide as the carrier is prepared, or when the vanadium oxide as the active component is loaded, or when the titanium oxide as the carrier is prepared and the vanadium oxide as the active component is loaded. The catalyst remarkably improves low-temperature denitration activity and catalytic capability, can reach the NO removal rate of over 90 percent at a temperature over 200 DEG C, has strong industrial application value, and can be widely applied to the NH3 selective catalytic reduction of nitrogen oxides in flue gas.

Description

a technical field [0001] The invention relates to a catalyst, in particular to a low-temperature NH catalyst used in flue gas 3 Selective Catalytic Reduction (SCR) Removal of NO X Catalysts and their preparation methods. 2. Background technology; [0002] Nitrogen oxides (NO X ) mainly comes from the combustion of fossil fuels. It is not only the main cause of acid rain, but also can react with hydrocarbons to form photochemical smog. At present, it has become an important air pollutant after inhalable particulate matter and sulfur dioxide. Therefore, developing effective NO X Emission control measures are of great significance to improve the quality of my country's atmospheric environment. [0003] NO X The control mainly adopts the post-combustion treatment method, and the current industrial applications are mainly selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) technologies. The reaction temperature of SNCR technology is about 1000°C...

Claims

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Application Information

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IPC IPC(8): B01J27/135B01J27/12B01J23/22B01D53/56
Inventor 钟秦李云涛
Owner NANJING UNIV OF SCI & TECH
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