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 applicat

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] The preparation method of the present invention is based on the metal precursor and the HY molecular sieve as the main active component, and the ultrasonic ion exchange method is used to form a wide temperature and vanadium denitration catalyst in the HY molecular sieve substrate surface, in the present application, including the following steps:

[0035] A method of preparation of a wide temperature without vanadium denitration catalyst, wherein the method comprises the steps of:

[0036] Step 1, a chromium-containing precursor, a copper-containing precursor, and a copper-containing precursor is dissolved in deionized water, and stirring is stirred in a water bath 20 to 30 ° C to obtain a mixed solution;

[0037] Step 2, adding a pre-treatment obtained by adding a pretreated Hy molecular sieve to 70 to 80 ° C to obtain a viscous mixture to 70 to 80 ° C for 70 to 80 ° C.

[0038] Among them, the HY molecular sieve obtained by pretreatment is prepared by calcination of 1 to ...

Example Embodiment

[0043] Example 1

[0044] Take 1.5GCR (NO 3 ) 2 · 9h 2 O, 7.5G FESO 4 · 7h 2 O Pour in 100ml beaker, add 40ml deionized water to dissolve; then 0.75g Cu (NO 3 ) 2 · 3h 2 O Add a beaker, stirred at 20 ° C for 30min; 15 g of 15 g of a pretreated Hy molecular sieve was added, stirred for 60 min; 80 ° C water bath, while stirring evaporates to obtain a viscous mixture; 40 kHz ultrasonic oscilute 30 min, room temperature Chen 24h; then dried at 190 ° C for 12 h; 450 ° C, calcined for 5 h (the temperature control rate was controlled at 5 to 8 ° C / h), naturally cooled to obtain a finished catalyst.

[0045] Using a wide temperature-free vanadium denitration catalyst prepared in Example 1, NH 3 -SCR denitrifted reaction experiment, test temperature change on denitrination efficiency.

[0046]The specific reaction conditions of the denitritation reaction experiment are: the volume concentration of oxygen is 40000 ppm, the volume concentration of nitric oxide is 700 ppm, and the volume co...

Example Embodiment

[0051] Example 2

[0052] The difference from the first embodiment is: Added Cr (NO 3 ) 2 · 9h 2 The mass of O is 1.0 g, other preparation steps and preparation conditions are the same as in Example 1.

[0053] Then in the obtained catalyst for NH 3 -SCR denitritating reaction experiment, the effect of test temperature change on denitrination efficiency, the specific reaction conditions of the denitritating reaction experiment were the same as in Example 1.

[0054] Such as figure 1 As shown, the catalyst produced by the present embodiment has a higher denitrification efficiency in the range of 250 to 360 ° C, and the catalyst can reach more than 80% in the catalyst at 270 ° C to 360 ° C. It will be apparent that the active range of the catalyst obtained in the present embodiment is wider.

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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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