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Catalyst for selective catalytic reduction denitration and preparation method thereof

A technology of catalyst and reduction method, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., which can solve the problems of increased energy consumption, decreased catalyst activity, and decreased boiler efficiency, etc. problem, to achieve the effect of improving efficiency, efficient adsorption, and enhancing contact time

Pending Publication Date: 2021-12-10
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the active temperature range of the vanadium-titanium-tungsten catalyst is basically 300-400°C. When the temperature is further lowered, the NH 4 HSO 4 Enter the catalyst micropores to block the active sites, reducing the catalyst activity
With the expansion of the new energy scale, the flue gas temperature of the SCR denitrification device in coal-fired power plants can no longer meet the applicable temperature range of the vanadium-titanium-tungsten catalyst after deep peak regulation in coal-fired power plants. It is necessary to renovate the boiler to increase the flue gas temperature of the low-load SCR device. Reduced boiler efficiency and increased energy consumption

Method used

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  • Catalyst for selective catalytic reduction denitration and preparation method thereof
  • Catalyst for selective catalytic reduction denitration and preparation method thereof
  • Catalyst for selective catalytic reduction denitration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] According to 1.5 parts of ammonium metavanadate, 17 parts of ammonium paratungstate, 1.3 parts of calcium silicate, 4.5 parts of barium sulfate, 15 parts of cerium carbonate, 20 parts of manganese carbonate, 145 parts of titanium dioxide, 8 parts of glass fiber, 1.5 parts of hardwood pulp, and 6 parts of ammonia water parts, 15 parts of acetic acid, 25 parts of oxalic acid, 1.3 parts of ethanolamine, 1.6 parts of lactic acid, 1.5 parts of carboxymethyl cellulose, 0.5 parts of stearic acid and 1.1 parts of ethylene oxide to prepare the honeycomb catalyst. The performance of the performance test on the bench is shown in Table 1, and Table 1 shows the performance test results of the modified catalyst prepared in Example 1 at different temperatures.

[0046] Table 1

[0047]

[0048]

[0049] It can be seen that the modified denitration catalyst has good denitration activity and low SO 2 / SO 3 Conversion rate, satisfying SO 2 / SO 3 The conversion rate is not highe...

Embodiment 2

[0051] A preparation method for selective catalytic reduction method denitration catalyst, comprising the following steps:

[0052] S1. Weigh 130 parts of titanium dioxide by weight, add 0.2 parts of stearic acid and 1.3 parts of lactic acid with a mass concentration of 50%, and knead for 30 minutes through a dry powder mixer, and stir and mix evenly to obtain a mixed raw material .

[0053] S2. Add 5 parts of ammonia water and deionized water with a mass concentration of 15% to the mixture obtained in S1, and add 5 parts of glass fiber and 1 part of hardwood pulp, and stir for about 80 minutes to obtain a uniform and stable mixture;

[0054] S3. Weigh 20 parts of oxalic acid and add it to deionized water to form a 2mol / L oxalic acid solution, heat the oxalic acid solution to 85°C, add 1 part of ammonium metavanadate, 15 parts of ammonium paratungstate and 1.2 parts of ethanolamine to the hot oxalic acid solution solution, keep the temperature of the solution at 85°C and stir...

Embodiment 3

[0061] A preparation method for selective catalytic reduction method denitration catalyst, comprising the following steps:

[0062] S1. Weigh 140 parts of titanium dioxide by weight, add 0.3 parts of stearic acid and 1.5 parts of lactic acid with a mass concentration of 50%, and knead for 40 minutes through a dry powder mixer, and stir and mix it evenly to obtain a mixed raw material .

[0063] S2. Add 5 parts of ammonia water and deionized water with a mass concentration of 15% to the mixture obtained in S1, and add 6 parts of glass fiber and 1.2 parts of hardwood pulp, and stir for 92 minutes to obtain a uniform and stable mixture;

[0064] S3. Weigh 21 parts of oxalic acid and add it to deionized water to form a 2mol / L oxalic acid solution, heat the oxalic acid solution to 86°C, add 1.5 parts of ammonium metavanadate, 17 parts of ammonium paratungstate and 1.3 parts of ethanolamine to the hot oxalic acid solution Solution, keep the temperature of the solution at 86°C and s...

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Abstract

The invention discloses a catalyst for selective catalytic reduction denitration and a preparation method thereof, and the preparation method comprises the following steps: weighing titanium dioxide, adding stearic acid and lactic acid, and uniformly performing stirring and mixing; adding ammonia water, deionized water, glass fiber and broad-leaved tree pulp into the mixed material, adding hot oxalic acid solution of ammonium metavanadate, ammonium paratungstate and ethanolamine into the mixed material, performing mixing, adding acetic acid solution of cerium carbonate and manganese carbonate, performing stirring and mixing, adding calcium silicate and barium sulfate, and adding a carboxymethyl cellulose aqueous solution, ethylene oxide and deionized water; adjusting the pH value of the solution by adopting ammonia water, and shaping, drying and calcining the mixed material after vacuum treatment to obtain the catalyst. The catalyst is reasonable in component, simple in process and controllable in cost, and by adding cerium oxide and manganese dioxide into the vanadium-titanium-tungsten-based denitration catalyst, the SO2 conversion rate of the vanadium-based catalyst is reduced, the use temperature range of the vanadium-based catalyst is widened, and the denitration efficiency of the catalyst under the low-temperature effect is improved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas purification, and relates to a catalyst for selective catalytic reduction denitrification and a preparation method thereof. Background technique [0002] The most widely used flue gas denitrification technology in coal-fired power plants is selective catalytic reduction of ammonia (NH 3 -SCR) technology, under the action of vanadium titanium tungsten catalyst, NO and reducing agent NH 3 The following reaction occurs: [0003] 4NH 3 +4NO+O 2 →4N 2 +6H 2 o [0004] Because vanadium titanium tungsten catalyst has good catalytic activity, selectivity and sulfur resistance performance at 300-400 °C, it is widely used in the removal of nitrogen oxides in flue gas of coal-fired power plants. However, the vanadium titanium tungsten catalyst active component V 2 o 5 SO in the flue gas will be 2 converted to SO 3 , SO 3 and escape NH 3 Produces strongly adherent NH 4 HSO 4 , NH 4...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/04B01J35/10B01D53/86B01D53/56
CPCB01J23/34B01D53/8628B01J35/56B01J35/60
Inventor 杨世极潘栋舒凯徐晓涛李淑宏袁壮
Owner XIAN THERMAL POWER RES INST CO LTD
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