Composite smoke SCR (selective catalytic reduction) denitrification catalyst and preparation method thereof

A composite catalyst and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult to achieve industrial production, difficult to deal with deactivated catalysts, and high catalyst preparation costs, and reach the active temperature. The effect of wide window, strong resistance to SO2 and H2O poisoning, and high SCR denitration efficiency

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the patents on low-temperature flue gas denitration catalysts and their preparation in the prior art, the catalysts disclosed in patents CN 101428215A, CN 10134722A, CN 101468314A, CN 101422728A and CN 101676019A all contain toxic components such as vanadium and tungsten, which seriously pollute the environment. The deactivated catalyst is difficult to handle; and the catalyst temperature above 180°C can achieve 90% denitrification rate
The catalyst disclosed in the

Method used

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  • Composite smoke SCR (selective catalytic reduction) denitrification catalyst and preparation method thereof
  • Composite smoke SCR (selective catalytic reduction) denitrification catalyst and preparation method thereof
  • Composite smoke SCR (selective catalytic reduction) denitrification catalyst and preparation method thereof

Examples

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Example Embodiment

[0029] Example 1

[0030] The flue gas SCR denitration composite catalyst is prepared according to the method of the present invention, and the preparation method is:

[0031] (1) Put the honeycomb ceramic carrier into an ultrasonic vibrator, pour it into deionized water, ultrasonically clean it, and dry it. The dust-removed carrier is continuously immersed in a 5% nitric acid solution and boiled for 8 hours. After cooling, the surface of the carrier and the residual acid in the holes are cleaned with deionized water, and then dried for use.

[0032] (2) Weigh the catalyst active component precursors: manganese acetate, molybdenum nitrate and nickel nitrate according to the molar ratio of Mn / Mo / Ni elements of 1:0.1:0.2, mix them evenly and dissolve them in 15ml of deionized water, and stir well. A certain amount of cocatalyst precursor cerium nitrate was added to the solution to prepare a saturated solution, in which the molar ratio of Mn element to the cocatalyst precursor was 1:0....

Example Embodiment

[0048] Example 2

[0049] The flue gas SCR denitration composite catalyst is prepared according to the method of the present invention, and the preparation method is:

[0050] (1) Put the molecular sieve carrier into an ultrasonic vibrator, pour it into deionized water for ultrasonic cleaning and then dry it. The dust-removed carrier is continuously immersed in a 14% citric acid solution and boiled for 9 hours. After cooling, the surface of the carrier and the residual acid in the holes are cleaned with deionized water, and then dried for use.

[0051] (2) Weigh the precursors of the catalyst active components: manganese chloride, molybdenum chloride and nickel nitrate according to the molar ratio of Mn / Mo / Ni elements of 1:0.3:0.1, mix them evenly and dissolve them in 20ml of deionized water, and stir thoroughly After homogenization, a certain amount of cocatalyst precursor copper nitrate and cerium acetate are added to the solution to prepare a saturated solution, wherein the molar...

Example Embodiment

[0056] Example 3

[0057] The flue gas SCR denitration composite catalyst is prepared according to the method of the present invention, and the preparation method is:

[0058] (1) Place the activated carbon carrier in an ultrasonic vibrator, pour it into deionized water, ultrasonically clean it, and dry it. The dedusted carrier is continuously immersed in a 26% carbonic acid solution and boiled for 10 hours. After cooling, the surface of the carrier and the residual acid in the pores are cleaned with deionized water, and then dried for use.

[0059] (2) Weigh the precursors of the catalyst active components: manganese nitrate, molybdenum chloride and nickel nitrate according to the molar ratio of Mn / Mo / Ni elements of 1:0.4:0.9, mix and dissolve them in 17ml of deionized water, stir well Then add a certain amount of co-catalyst precursor chromium chloride and cerium chloride to the solution to prepare a saturated solution, wherein the molar ratio of Cr / Ce is 1:1, and the molar ratio ...

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Abstract

The invention relates to a composite smoke SCR (selective catalytic reduction) denitrification catalyst. The composite smoke SCR denitrification catalyst takes honeycomb ceramics, activated carbon or a molecular sieve as a carrier. A composite manganese-molybdenum-nickel-loaded metal oxide is an active component, one or more of copper, chromium, cerium, tin and lanthanum are used as cocatalysts, and the total mass of the active components of the catalyst and the cocatalysts accounts for 15-30% of the mass of the carrier, wherein the molar ratio of Mn to Mo to Ni is 1:(0.1-1):(0.1-1), and the molar ratio of manganese to a metallic element of the co-catalyst is 1: (0.1-1). The catalyst provided by the invention is prepared by adopting a dipping method. Compared with the existing denitrification catalyst suitable for the temperature lower than 300 DEG C, the catalyst provided by the invention has the advantages of high denitrification efficiency, low cost, simple production process, long service life, wide active temperature window, high SO2 and H2O poison resistance capability and the like. Within the temperature from 80 DEG C to 300 DEG C, the conversion rate of NO is more than 90%.

Description

technical field [0001] The invention relates to a flue gas denitration catalyst and a preparation method thereof, in particular to a selective catalytic reduction (SCR) denitration composite catalyst and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmospheric environment. Atmospheric NO X It can cause acid rain, photochemical smog, surface water eutrophication and other problems that damage the ecological environment and endanger human health. With NO X Emissions continue to increase, and environmental pollution is becoming more and more serious. my country has promulgated and implemented emission standards for air pollutants from thermal power plants for four times. The latest standard promulgated in 2009 stipulates that coal-fired power plants newly built, rebuilt and expanded in key areas sha...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J29/00B01J35/10B01D53/56B01D53/86
Inventor 祝社民卫平波童志武樊恩亚沈岳松沙志强张舒杨沈树宝徐凌
Owner CHINA PETROLEUM & CHEM CORP
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