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Catalyst used for low temperature desulphurization and denitration of flue gas and preparation method thereof

A desulfurization and denitrification, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as poor toxicity, short service life, and low sulfur capacity

Active Publication Date: 2015-11-11
成都达奇科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical status and deficiencies of multiple denitrification catalysts in the prior art, the purpose of the present invention is to provide a novel carbon-based catalyst for low-temperature desulfurization and denitrification of flue gas and its preparation method to overcome the carbon-based desulfurization and denitrification catalysts in the prior art. Low sulfur capacity, short service life and SO resistance 2 Poor toxicity and other issues

Method used

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  • Catalyst used for low temperature desulphurization and denitration of flue gas and preparation method thereof
  • Catalyst used for low temperature desulphurization and denitration of flue gas and preparation method thereof
  • Catalyst used for low temperature desulphurization and denitration of flue gas and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Activated carbon (AC) was placed in a beaker, and nitric acid with a weight concentration of 39% was added to immerse the AC in the nitric acid, sealed and left to stand for about 12 hours. After full immersion, wash with water until the eluate is neutral, filter with suction, and dry. The obtained sample is recorded as ACN. Weigh 25g of ACN, calculate the required amount of manganese nitrate solution according to the loading of Mn being 5wt% of the catalyst weight and the law of conservation of Mn element. Mix CAN with manganese nitrate solution, add an appropriate amount of distilled water, make the liquid submerged in CAN, let it stand for about 10 hours, put it in a water bath and evaporate to dryness, so that Mn is impregnated on CAN. The Mn-impregnated CAN was calcined at about 650 °C in a pure nitrogen atmosphere for about 3 hours to obtain a desulfurization and denitration catalyst with a Mn loading of 5%, which was denoted as Mn / ACN. According to the evaluatio...

Embodiment 2

[0029] Activated carbon (AC) was placed in a beaker, and nitric acid with a weight concentration of 20% was added to immerse the AC in the nitric acid, sealed and left to stand for about 10 hours. Then wash with water until the eluate is neutral, filter with suction and dry, and the obtained sample is recorded as ACN. Weigh 25g of ACN, calculate the required amount of cerium nitrate solution according to the Ce loading amount is 5wt% of the catalyst weight and the Ce element conservation law. Mix CAN with cerium nitrate solution, add an appropriate amount of distilled water, make the liquid submerged in CAN, let it stand for about 12 hours, put it in a water bath and evaporate to dryness, so that Ce is impregnated on CAN. A desulfurization and denitration catalyst with a Ce loading of 5% can be obtained by calcining the CAN impregnated with Ce in a pure nitrogen atmosphere at about 450 °C for about 3 hours, which is denoted as Ce / ACN. According to the evaluation conditions in...

Embodiment 3

[0031] Activated carbon (AC) was placed in a beaker, and nitric acid with a weight concentration of 30% was added to immerse the AC in the nitric acid, sealed and left to stand for about 10 hours. Then wash with water until the eluate is neutral, filter with suction and dry, and the obtained sample is recorded as ACN. Weigh 25g of ACN, calculate the required amount of manganese nitrate solution according to the loading of Mn being 5wt% of the catalyst weight and the law of conservation of Mn element. Mix CAN with manganese nitrate solution, add an appropriate amount of distilled water, make the liquid submerged in CAN, let it stand for about 10 hours, put it in a water bath and evaporate to dryness, so that Mn is impregnated on CAN. The Mn-impregnated CAN was calcined at about 650 °C in a pure nitrogen atmosphere for about 3 hours to obtain a desulfurization and denitration catalyst with a Mn loading of 5%, which was denoted as Mn / ACN. On the as-prepared Mn / ACN catalyst, 1% C...

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Abstract

The invention discloses a catalyst used for low temperature desulphurization and denitration of flue gas and a preparation method thereof. The catalyst uses active carbon modified by nitric acid as a carrier and the transition metal Mn and / or the rare earth element as active components; the active components are loaded on the carrier through dipping and high temperature roasting; and the load amount of Mn is 0 to 7 wt% of the weight of the catalyst, the load amount of Ce is 0 to 9 wt% of the weight of the catalyst, and the total load amount of the active components is no less than 3 wt% of the weight of the catalyst. The preparation method for the catalyst comprises the following steps: soaking active carbon in nitric acid for modification, soaking the carbon modified by nitric acid in a manganese nitrate solution or / and cerium nitrate solution and evaporating a liquid phase to dryness so as to allow the modified active carbon to be infiltrated by Mn and / or Ce; and fully roasting the modified active carbon infiltrated by Mn and / or Ce in a roasting apparatus so as to obtain the active-component-loaded catalyst used for low temperature desulphurization and denitration of flue gas. The catalyst has high desulphurization and denitration efficiency in a temperature range of 80 to 220 DEG C.

Description

technical field [0001] The invention relates to the technical field of desulfurization and denitration catalysts, in particular to a catalyst for low-temperature desulfurization and denitration of flue gas and a preparation method thereof. Background technique [0002] Activated carbon dry flue gas desulfurization and denitrification is to control SO 2 1. One of the effective means of NOx emission. The basic principle is to use the special surface chemical properties of activated carbon, rich functional groups, large specific surface area and developed pore structure, and then modify it to catalyze the removal of flue gas. SO in 2 and NOx. The key to activated carbon dry flue gas desulfurization and denitrification is the performance of the catalyst. The factors that determine the performance of the catalyst mainly include the type of active component, the method of addition, and the roasting temperature. [0003] The patent document with publication number CN1475305A dis...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/10B01D53/86B01D53/60
Inventor 郭家秀尹华强楚英豪方宁杰李建军刘勇军罗德明
Owner 成都达奇科技股份有限公司
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