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Wide-temperature vanadium-free denitration catalyst as well as preparation method and application thereof

A denitrification catalyst and reaction technology, applied in the field of flue gas purification, can solve the problems of harmful products, narrow active temperature range, unstable denitrification efficiency, etc., achieve strong water and sulfur resistance, wide active temperature range, and benefit The effect of recycling and regeneration

Pending Publication Date: 2022-03-29
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and deficiencies of the prior art, the purpose of the present invention is to provide a wide-temperature vanadium-free denitration catalyst, a preparation method and its application, so as to solve the problems of the narrow active temperature range of the denitration catalyst in the prior art, unstable denitration efficiency, and formation of Technical aspects of hazardous products

Method used

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  • Wide-temperature vanadium-free denitration catalyst as well as preparation method and application thereof
  • Wide-temperature vanadium-free denitration catalyst as well as preparation method and application thereof
  • Wide-temperature vanadium-free denitration catalyst as well as preparation method and application thereof

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preparation example Construction

[0034] The preparation method of the present invention uses metal precursors and HY molecular sieve as the main active component as raw materials, and adopts the ultrasonic ion exchange method to form a wide temperature vanadium-free denitration catalyst on the surface of the HY molecular sieve substrate. In this application, the following steps are included:

[0035] A method for preparing a wide-temperature vanadium-free denitration catalyst, characterized in that the method comprises the following steps:

[0036] Step 1. Dissolving the chromium-containing precursor, the iron-containing precursor and the copper-containing precursor in deionized water, and stirring in a water bath at 20-30°C for 30-60 minutes to obtain a mixed solution;

[0037] Step 2. Add the pretreated HY molecular sieve to the mixed solution obtained in step 1, and heat it in a water bath to 70-80°C under stirring conditions to obtain a viscous mixture;

[0038] Among them, the pretreated HY molecular sie...

Embodiment 1

[0044] Take 1.5gCr(NO 3 ) 2 9H 2 O, 7.5g FeSO 4 ·7H 2 Pour O into a 100ml beaker, add 40ml deionized water to dissolve; then weigh 0.75g Cu(NO 3 ) 2 ·3H 2 O was added to a beaker and stirred in a water bath at 20°C for 30 minutes; then 15 g of pretreated HY molecular sieves were added to the beaker and stirred for 60 minutes; heated in a water bath at 80°C while stirring and evaporating until a viscous mixture was obtained; 24h; then drying at 190°C for 12h; calcining at 450°C for 5h (the heating rate is controlled at 5-8°C / h), and natural cooling to obtain the finished catalyst.

[0045] Using the wide temperature vanadium-free denitration catalyst prepared in Example 1, carry out NH 3 -SCR denitrification reaction experiment to test the influence of reaction temperature changes on denitrification efficiency.

[0046]The specific reaction conditions of the denitration reaction experiment are: the volume concentration of oxygen is 40000ppm, the volume concentration of ...

Embodiment 2

[0052] The difference between this embodiment and embodiment 1 is: the added Cr(NO 3 ) 2 9H 2 The quality of O is 1.0g, and other preparation steps and preparation conditions are the same as in Example 1.

[0053] Then NH was carried out with the prepared catalyst 3 - SCR denitrification reaction experiment, checking the influence of reaction temperature change on the denitrification efficiency, the specific reaction conditions of the denitrification reaction experiment are the same as in Example 1.

[0054] like figure 1 As shown, the catalyst prepared in this example has a higher denitrification efficiency in the range of 250-360°C, and the denitrification efficiency of the catalyst can reach more than 80% at 270°C-360°C. It shows that the activity range of the catalyst prepared in this example is relatively wide.

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Abstract

The invention discloses a wide-temperature vanadium-free denitration catalyst preparation method, which comprises: 1, dissolving a chromium-containing precursor, an iron-containing precursor and a copper-containing precursor in deionized water, and stirring in a water bath at a temperature of 20-30 DEG C for 30-60 min to obtain a mixed solution; step 2, adding a pretreated HY molecular sieve into the mixed solution obtained in the step 1, and heating in a water bath to 70-80 DEG C under a stirring condition to obtain a viscous mixture; and step 3, sequentially carrying out ultrasonic oscillation, room-temperature aging, drying, roasting and cooling treatment on the obtained viscous mixture to obtain the catalyst, the mass ratio of the HY molecular sieve to the Fe precursor is (1.33-2.67): 1. The prepared wide-temperature vanadium-free denitration catalyst is wide in active temperature range, low in activation temperature and high in denitration efficiency, the composite desulfurization catalyst can be arranged in equipment behind a dust remover and a desulfurization tower, the service mechanical life of the catalyst is prolonged, and the denitration efficiency can reach 95% or above within the range of 200-360 DEG C under the sulfur-free working condition.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a wide-temperature vanadium-free denitrification catalyst, a preparation method and an application thereof. Background technique [0002] Industrial and mining enterprises that use coal as the main fuel are NO X major source of air pollutants. NOx will produce acid rain or photochemical smog, and its secondary pollution will aggravate the smog weather, which will not only cause heavy economic losses, but also seriously affect the life and health of residents, and further affect the sustainable development of my country's economy and ecological environment. At present, controlling pollutant discharge, protecting the environment and developing the economy are all crucial to our country, and there is no delay. [0003] The core of SCR denitrification technology is to prepare highly active catalysts, and the current mainstream catalysts are mainly V-Mo-TiO...

Claims

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Application Information

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IPC IPC(8): B01J29/14B01D53/86B01D53/56
CPCB01J29/146B01D53/8628
Inventor 王治宙李炳宏刘程郭毅定张溪彧葛光荣汪凡张全
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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