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Medium-high temperature SCR denitrification catalyst with effect of resisting alkali metal poisoning and preparation method of medium-high temperature SCR denitrification catalyst with effect of resisting alkali metal poisoning

A denitrification catalyst, medium and high temperature technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve the problem of insufficient anti-alkali metal poisoning performance, short catalyst service life, Complicated production process and other issues, to achieve good anti-alkali metal poisoning performance, easy operation, high denitrification activity effect

Inactive Publication Date: 2017-01-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems in the prior art, such as insufficient anti-alkali metal poisoning performance, short service life of the catalyst, complicated manufacturing process, etc.

Method used

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  • Medium-high temperature SCR denitrification catalyst with effect of resisting alkali metal poisoning and preparation method of medium-high temperature SCR denitrification catalyst with effect of resisting alkali metal poisoning
  • Medium-high temperature SCR denitrification catalyst with effect of resisting alkali metal poisoning and preparation method of medium-high temperature SCR denitrification catalyst with effect of resisting alkali metal poisoning

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Experimental program
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Effect test

Embodiment

[0035] A medium-high temperature SCR denitration catalyst with anti-alkali metal poisoning and a preparation method thereof, characterized in that it comprises the following steps:

[0036] 1) Prepare materials

[0037] Each component in the denitration catalyst and its mass percentage content: V 2 o 5 1%, WO 3 5%, CeO 2 10%, TiO 2 84%;

[0038] According to each component in the denitrification catalyst and its mass percentage content, calculate and weigh the mass of the required medicine;

[0039] Described medicine comprises ammonium metavanadate (NH 4 VO 3 ), ammonium tungstate ((NH 4 ) 10 h 2 (W 2 o 7 ) 6 ), cerium nitrate (Ce(NO 3 ) 3 ), titanium dioxide (TiO 2 ) and oxalic acid (H 2 C 2 o 4 2H 2 O);

[0040] The ratio of the amount of ammonium metavanadate to oxalic acid is 1:2;

[0041] 2) Preparation of impregnation solution

[0042] 2.1) Add 0.643 grams of ammonium metavanadate and 2.736 grams of ammonium tungstate weighed in step 1) into the c...

experiment example 1

[0053] Carry out denitrification performance test to the catalyst sample prepared in the embodiment:

[0054] Take 0.2 g of the prepared catalyst and put it into a fixed bed quartz tube reactor for activity test. The reactor inlet contains 500ppm NO, 500ppm NH 3 , 3% O 2 , and the rest are N2. The total gas flow rate is 500mL / min, the space velocity is 150,000mL / g h, and the test reaction temperature is 150-450°C. The test data are as follows figure 2 shown.

experiment example 2

[0056] The catalyst sample prepared in the embodiment is carried out anti-alkali metal poisoning performance test:

[0057] The alkali metal is loaded into 5 g of the catalyst by the impregnation method, and the loading amount of the alkali metal is K / V or the ratio of the amount of Na / V substance is 4.

[0058] Weigh 0.083g KCl, 0.065g NaCl, 0.111g KNO according to the proportion 3 and 0.093 g NaNO 3 Dissolve in deionized water, then add 5 grams of catalyst powder ground to below 200 mesh, stir for 6 hours, and then dry at 105°C. The nitrate-loaded catalyst needs to be calcined at 450°C for 3 hours to obtain an alkali metal poisoning sample.

[0059] The poisoned sample was tested for denitrification activity, and it was found that the catalyst doped with Ce exhibited excellent anti-alkali metal poisoning performance, and the denitrification activity reached more than 80% at 300-400°C. Test data such as figure 2 shown.

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Abstract

The invention discloses a medium-high temperature SCR denitrification catalyst with an effect of resisting alkali metal poisoning and a preparation method of the medium-high temperature SCR denitrification catalyst with the effect of resisting the alkali metal poisoning. The catalyst is prepared from the following components in percentage by mass: 1 percent of V2O5, 5 percent of WO3, 10 percent of CeO2, and the balance of TiO2. The preparation method of the catalyst comprises four steps: preparation of impregnation liquid, supporting of active components, ultrasonic impregnation and roasting. The catalyst disclosed by the invention is modified by the added CeO2; more surface acid sites and chemical adsorption oxygen are formed to facilitate adsorption and oxidation of NH3 on the surface of the catalyst; by using a V-O-Ce active center formed by a synergistic effect between V and Ce, the active center of the V can be effectively prevented from being damaged by alkali metal, and further denitrification performance and performance of resisting the alkali metal poisoning are greatly improved. The preparation method of the catalyst, disclosed by the invention, is simple, distinct in flow, easy to operate and safe; the prepared catalyst has remarkable advantage in flue gas of which the content of the alkali metal is higher.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a medium-high temperature SCR denitrification catalyst capable of resisting alkali metal poisoning and a preparation method thereof. Background technique [0002] Coal is one of the main energy sources in the world today. With social progress and economic development, the development and utilization of coal has seriously polluted the natural environment. According to statistics, more than 90% of NOx in air pollutants comes from the combustion of fuels such as coal, oil, and natural gas, and 70% of which comes from the combustion of coal. Coal is still the main energy source for power development, and its consumption accounts for about 70% of the country's total energy production. [0003] On January 1, 2012, the state promulgated and implemented the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), and the new thermal power projects will start fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/02B01J37/34
CPCB01J23/30B01J37/0213B01J37/0234B01J37/0236B01J37/343
Inventor 刘清才林凡胡广杨剑方诗惠孔明蒋历俊郭富强
Owner CHONGQING UNIV
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