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A low-temperature anti-sulfur denitrification catalyst and preparation method thereof

A denitration catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of reduced catalyst activity, weak anti-sulfur poisoning ability, nitrogen oxide pollution, etc., and achieve low-temperature denitrification. Improved performance, remarkable anti-sulfur effect and strong water resistance

Active Publication Date: 2016-09-07
XIAN SINO GREEN HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

90% SO in air pollutants 2 and 70% NO x From the combustion of coal, the energy structure dominated by coal has led to a high total amount of air pollutant emissions. Potential environmental problems continue to emerge. Air pollution in the Yangtze River Delta, Pearl River Delta, and Beijing-Tianjin-Hebei region and other urban agglomerations has gradually become obvious. regional characteristics, the type of acid rain has changed from sulfuric acid type to sulfuric acid and nitric acid compound type, and the pollution of nitrogen oxides has not been effectively controlled
(2) Molecular sieve catalysts selectively reduce NO at higher temperatures x Has high catalytic activity, and the active temperature range is relatively wide, but resistant to H 2 O and SO 2 Poor ability
(3) Carbon-based catalysts exhibit good SCR activity at low temperatures, but their ability to resist sulfur poisoning is not strong, especially unstable and flammable at temperatures above 250 °C, which hinders their use in SCR research. development in
However, the problem is that the medium temperature catalyst must be operated at a temperature higher than 350°C to avoid SO 2 Weaken the activity, which requires that the SCR catalyst system must be placed above the desulfurization and dust removal devices (such as figure 1 shown) to take advantage of the high temperature of the flue gas, otherwise an air preheating device is required
However, such an installation position will greatly reduce the allowable operating temperature of the SCR reactor (150-200°C).
Such a reaction temperature makes all currently used high-temperature SCR catalysts significantly reduce their activity and cannot complete the task of denitrification.
At the same time, at such low temperatures, the SO present in the flue gas 2 Will react with added ammonia to form ammonium sulfate or ammonium sulfite which deposits on the catalyst surface leading to its deactivation

Method used

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  • A low-temperature anti-sulfur denitrification catalyst and preparation method thereof
  • A low-temperature anti-sulfur denitrification catalyst and preparation method thereof
  • A low-temperature anti-sulfur denitrification catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] 1%V-10%Sn / AC (Note: The percentage signs in the following catalyst compositions are all mass percentages)

[0049] Its preparation process is as follows:

[0050] 1) Weigh a certain amount of activated carbon columnar particles at 30% H 2 / N 2 Continuous activation at 800°C for 1 hour under an atmosphere. After this step of hydrogenation treatment, the pore structure of activated carbon will be more developed, so as to facilitate the loading of denitrification active sites in the later stage;

[0051] 2) The above-mentioned activated carbon was placed in 1N hydrochloric acid and nitric acid aqueous solution and continued to soak for 8 hours. Wherein, the mol ratio of hydrochloric acid and nitric acid is 1:1;

[0052] 3) The activated carbon after the acidification treatment is repeatedly rinsed with deionized water at room temperature and under the condition of vacuum filtration until the filtrate becomes neutral;

[0053] 4) Place the cleaned activated carbon in...

Embodiment 2

[0066] 5%K-1%Ag-1%V-10%Sn / AC

[0067] Its preparation process is as follows:

[0068] 1) Weigh a certain amount of activated carbon columnar particles at 30% H 2 / N 2 Continuous activation at 800°C for 2 hours under an atmosphere. After this step of hydrogenation treatment, the pore structure of activated carbon will be more developed, so as to facilitate the loading of denitrification active sites in the later stage;

[0069] 2) The above-mentioned activated carbon was placed in 1N hydrochloric acid and nitric acid aqueous solution and continued to soak for 8 hours. Wherein, the mol ratio of hydrochloric acid and nitric acid is 1:1;

[0070] 3) The activated carbon after the acidification treatment is repeatedly rinsed with deionized water at room temperature and under the condition of vacuum filtration until the filtrate becomes neutral;

[0071] 4) Place the cleaned activated carbon in an oven and dry at 105°C for 8 hours;

[0072] 5) Weigh a certain amount of potas...

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Abstract

The invention discloses a low-temperature anti-sulfur denitrification catalyst and a preparation method thereof. The catalyst is formed by mixing components containing the following weight percentages: active site 1-15%; carbon-based carrier 85-99%; wherein, active site by Ag 2 O, K 2 O, BaO, SnO 2 、 Bi 2 o 3 Or one or more mixed compositions of vanadium-based alloy oxides improved by PbO. The preparation method is to prepare a low-temperature anti-sulfur denitrification catalyst by mixing active sites and carbon-based supports. Due to the surface hydrophobic treatment of the catalyst prepared by the present invention, the water molecules contained in the flue gas are difficult to attach to the pore structure of the catalyst to form capillary condensation or with the adsorbed NH 3 and SO 2 or SO 3 Formation of sulfuric acid or ammonium sulfite leads to catalyst deactivation.

Description

【Technical field】 [0001] The invention relates to the field of treatment of fossil fuel combustion tail gas, in particular to a low-temperature sulfur-resistant denitrification catalyst and a preparation method thereof. 【Background technique】 [0002] It is well known that nitrogen oxides (NO x ) is a harmful gas, the main air pollutant, not only can cause acid rain, photochemical smog, greenhouse effect and the destruction of the ozone layer; it can also cause serious water quality and soil quality deterioration, urban haze weather (PM2.5) and other environmental pollution problem, which poses a great threat to human health. 90% SO in air pollutants 2 and 70% NO x From the combustion of coal, the energy structure dominated by coal has led to a high total amount of air pollutant emissions. Potential environmental problems continue to emerge. Air pollution in the Yangtze River Delta, Pearl River Delta, and Beijing-Tianjin-Hebei region and other urban agglomerations has gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J23/68B01D53/90B01D53/56
Inventor 宋华
Owner XIAN SINO GREEN HI TECH CO LTD
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