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Low-cost SCR denitration catalyst and preparation method thereof

A denitrification catalyst, low-cost technology, applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the complex and harsh preparation steps, produce a large amount of waste liquid and waste residue, etc., achieve low raw material cost and reduce hazards , high catalytic activity

Active Publication Date: 2016-04-13
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation cost of the catalyst is relatively low, but it has complicated and harsh preparation steps, and a large amount of waste liquid and waste residue are produced during the preparation process.

Method used

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  • Low-cost SCR denitration catalyst and preparation method thereof
  • Low-cost SCR denitration catalyst and preparation method thereof
  • Low-cost SCR denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of the low-cost SCR denitration catalyst of the present embodiment is achieved through the following steps:

[0035] Step 1 Crush the low titanium slag (the components are shown in Table 1.1), sieve out 150g of 20-40 mesh titanium slag, dissolve it in 500mL of sodium hydroxide solution with a mass concentration of 15wt%, and place it in a hydrothermal kettle at 70°C. Then, the titanium slag was filtered and washed to neutrality, then dried at 105°C for 10h, and finally calcined at 400°C for 5h to obtain the catalyst carrier;

[0036] Step 2 Weigh 0.064g of ammonium metavanadate, 1.640g of ammonium tungstate and 1.704g of oxalic acid, respectively, and dissolve them in 100mL of deionized water, stir at room temperature for 30min, and then add 4.126g of copper nitrate and 0.997g of stannous sulfate to continue stirring. 90min, the substances in the solution are fully mixed and dissolved;

[0037] Step 3 Place 46g of the catalyst carrier prepared in...

Embodiment 2

[0042] The preparation method of the low-cost SCR denitration catalyst of this embodiment is realized through the following steps:

[0043] Step 1: Break the high-titanium slag (the composition is shown in Table 1.2), screen out 150g of 20-40 mesh titanium slag, dissolve it in 500mL of sodium hydroxide solution with a mass concentration of 15wt%, and place it in a hydrothermal kettle at 90°C neutralize for 3 hours, then filter and wash the titanium slag until it becomes neutral, then dry it at 120°C for 5 hours, and finally roast it at 400°C for 5 hours to obtain a catalyst carrier;

[0044] Step 2 Weigh 0.193g of ammonium metavanadate, 3.557g of sodium tungstate and 3.75g of oxalic acid and dissolve them in 100mL of deionized water, stir at room temperature for 30min, then add 5.894g of copper nitrate and 5.358g of tin tetrachloride to it Continue to stir for 90 minutes to fully mix and dissolve the substances in the solution;

[0045] Step 3 Place the 41.5g catalyst carrier...

Embodiment 3

[0049] The preparation method of the low-cost SCR denitration catalyst of this embodiment is realized through the following steps:

[0050] Step 1: Break the high-titanium slag (the composition is shown in Table 1.2), screen out 150g of 20-40 mesh titanium slag, dissolve it in 500mL of sodium hydroxide solution with a mass concentration of 15wt%, and place it in a hydrothermal kettle at 80°C After neutralizing for 4 hours, filter and wash the titanium slag until it becomes neutral, then dry it at 110°C for 4 hours, and finally roast it at 400°C for 5 hours to obtain a catalyst carrier;

[0051] Step 2 Weigh 0.129g of ammonium metavanadate, 2.187g of ammonium tungstate and 2.316g of oxalic acid and dissolve them in 100mL of deionized water, stir at room temperature for 30min, then add 4.822g of copper chloride and 2.852g of tetrachloride to it Tin continued to stir for 90 minutes to fully mix and dissolve the substances in the solution;

[0052] Step 3 Place the 41.5g catalyst...

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Abstract

The invention discloses a preparation method of a low-cost SCR denitration catalyst. The preparation method comprises the steps that titanium slag is pretreated through alkali liquor, precursors of V2O5, WO3, SnO2 and CuO are all dissolved in a same solution, the pretreated titanium slag is added into the solution, all the active components are made to be evenly distributed on a catalyst carrier under the supergravity condition, and therefore the catalyst has the higher reaction activity and stability; silicon dioxide in the titanium slag can be removed by pretreating the titanium slag through the alkali liquor, then the specific surface area of the catalyst is increased, and therefore the dispersity of all the active components in the catalyst is further improved. According to the low-cost SCR denitration catalyst and the preparation method thereof, the excellent denitration effect is achieved, the V2O5 content is greatly decreased while the production cost of the denitration catalyst is reduced, and therefore harm of the deactivated catalyst to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental catalysis, and relates to a low-cost SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, which can cause major environmental problems such as photochemical smog, acid rain, and ozone layer destruction, and has biological respiration toxicity. NO x The sources can be divided into natural sources and anthropogenic sources. Among anthropogenic sources, stationary sources represented by coal-fired power plant flue gas account for about 70% of the emission share. How to effectively remove NO x It has become an important topic in the field of environmental protection today. with NH 3 Selective catalytic reduction of NO as reducing agent x (NH 3 -SCR) technology has been widely used in stationary source flue gas denitrification since the 1970s. At present, the catalyst is very importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J32/00B01J23/889B01J21/06B01J37/02B01D53/86B01D53/56
CPCB01D53/8628B01J21/06B01J23/888B01J23/8892B01J37/0201
Inventor 史荣会林小英郑闽锋郑志功
Owner FUJIAN UNIV OF TECH
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