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Preparation method of supported medium and high temperature denitration catalyst

A denitrification catalyst, medium and high temperature technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., can solve the problem of poor catalytic activity of the catalyst, achieve good environmental protection and social benefits, improve dispersion, and not easy to powder effect

Inactive Publication Date: 2018-03-06
XIAN ORIGIN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101642715A discloses a cerium pyrophosphate catalyst. Although the denitrification efficiency is high above 350°C, the catalytic activity of the catalyst is relatively poor below 350°C.

Method used

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  • Preparation method of supported medium and high temperature denitration catalyst

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Embodiment 1

[0022] The method in this embodiment includes the following steps:

[0023] Step 1, the soluble active metal component precursor salt and the soluble auxiliary metal component precursor salt are all dissolved in deionized water to obtain a transparent impregnation solution; the soluble active metal component precursor salt is ferrous chloride; the soluble The auxiliary metal component precursor salt is tin tetrachloride; the quality of the active metal elemental Fe in the soluble active metal component precursor salt, the auxiliary metal element Sn in the soluble auxiliary metal component precursor salt and deionized water The ratio is 2.5:1:50;

[0024] Step 2, placing the molecular sieve carrier in the impregnation solution obtained in step 1 and immersing it for 12 hours, and drying it for 16 hours at a temperature of 110°C after filtering to obtain a catalyst precursor; the ratio of the mass of the molecular sieve carrier to the volume of the impregnation solution is 100:...

Embodiment 2

[0027] The method of the present embodiment comprises the following steps:

[0028] Step 1. Both the soluble active metal component precursor salt and the soluble additive metal component precursor salt are dissolved in deionized water to obtain a transparent impregnation solution; the active metal elemental Fe soluble additive in the soluble active metal component precursor salt The mass ratio of the auxiliary metal elemental Cr in the metal component precursor salt to deionized water is 5:2.5:75; the soluble active metal component precursor salt is ferric chloride; the soluble metal component precursor salt is chromium nitrate;

[0029] Step 2, placing the molecular sieve carrier in the impregnating solution obtained in step 1 for 24 hours, filtering and drying at 80°C for 24 hours to obtain a catalyst precursor; the ratio of the mass of the molecular sieve carrier to the volume of the impregnating solution is 100:75, wherein the unit of the mass of the molecular sieve carr...

Embodiment 3

[0032] The method of the present embodiment comprises the following steps:

[0033] Step 1. Both the soluble active metal component precursor salt and the soluble additive metal component precursor salt are dissolved in deionized water to obtain a transparent impregnation solution; the active metal elemental Fe soluble additive in the soluble active metal component precursor salt The mass ratio of the additive metal elemental Zr in the metal component precursor salt to deionized water is 10:0.5:100; the precursor salt of the soluble active metal component is iron nitrate; the precursor salt of the metal component of the soluble additive is Zirconium nitrate;

[0034] Step 2. Place the molecular sieve carrier in the impregnation solution obtained in step 1 and immerse it for 18 hours, filter and dry it for 12 hours at a temperature of 120° C. to obtain a catalyst precursor; the ratio of the mass of the molecular sieve carrier to the volume of the impregnation solution is 100:1...

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Abstract

The invention discloses a preparation method of a supported medium and high temperature denitration catalyst. The method comprises the following steps: 1, dissolving a soluble active metal component precursor salt and a soluble auxiliary metal component precursor salt into deionized water to obtain a transparent impregnation solution; 2, impregnating a molecular sieve carrier for 6h-24h, filtering, drying at temperature of 80-120 DEG C for 12h-24h to obtain a catalyst precursor; 3, putting the catalyst precursor in a heat treatment furnace, heating to 300 DEG C-400 DEG C, calcining while introduction of air for 1h-3h, heating up to 600-800 DEG C, calcining for 2h-6h, and cooling to obtain the supported medium and high temperature catalyst. The supported medium and high temperature denitration catalyst prepared by the method has high strength, is not easy to pulverize, has long service life, and has low catalyst bulk density. The catalyst has a NO conversion rate of 85% or more at a suitable application temperature of 300 to 500 DEG C.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a loaded medium-high temperature denitration catalyst. Background technique [0002] At present, more than 70% of the nitrogen oxides in the atmosphere are produced by the high-temperature combustion of fossil fuels, and these nitrogen oxides discharged into the atmosphere are slowly and seriously harmful to human health, public facilities and the environment. Nitrogen oxides will undergo a series of chemical reactions with water, oxygen, etc. in the air under the catalysis of particulate matter or light to form acid rain (HNO 3 ); In addition, these nitrogen oxides flow to the stratosphere and can be combined with ozone O 3 A chemical reaction occurs that destroys the ozone layer. At present, ammonia selective catalytic redox technology (NH 3 -SCR) is the most widely used and mature, and its catalyst V-W-Ti has a high denitrifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/48B01J29/40B01J37/02B01J37/08B01D53/86B01D53/56
Inventor 黄伟李飞满雪
Owner XIAN ORIGIN CHEM TECH
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