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Low-temperature smoke denitration SCR (silicon controlled rectifier) catalyst and preparation method

A technology of SCR catalyst and low-temperature flue gas, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of high engineering technology and catalyst costs, adverse ecological environment and human health, and activated carbon fiber machinery. Poor strength and other problems, to achieve the effect of forming and subsequent processing, low price, high mechanical strength

Active Publication Date: 2011-07-06
GUODIAN SCI & TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of flue gas denitrification, ammonia NH 3 As the selective catalytic reduction (SCR) process of the reducing agent, the catalyst used is mainly V 2 o 5 / TiO 2 series, the catalyst has high catalytic activity, but there are still the following shortcomings in domestic applications: First, the reaction temperature is relatively high, and the general operating temperature is about 350 ° C. In order to meet the temperature requirements, the catalytic bed is generally arranged in the dust collector before, but on the one hand this arrangement will cause the SO of the catalyst 2 and alkali metal poisoning, as well as dust blockage, on the other hand, it requires a large space behind the furnace; second, the vanadium in the active component is poisonous, which is harmful to the ecological environment and human health; third, the core technology of the catalyst has been monopolized by foreign countries , it is necessary to pay higher technology royalties for domestic promotion and application, so the cost of engineering technology and catalysts is very high
However, when activated carbon fibers are used as the carrier, the catalyst has poor water resistance. In addition, the mechanical strength of activated carbon fibers is poor, and the prepared catalyst is not easy to shape.
[0007] In summary, the popularization and application of low-temperature SCR catalysts is limited by the carrier, especially the shape of the catalyst needs to be further developed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Preparation of the carrier

[0050] Calcinate 0.3mm rod-shaped glass fiber in a muffle furnace at 600°C for 2h, take it out, acidify it with a sulfuric acid solution with a mass concentration of 30% for 2h, wash it with distilled water until neutral, dry it at 100°C, and grind it with Machine crushed it to 60 mesh powder.

[0051] 2) Catalyst loading

[0052] The glass fiber powder is placed in the mixed solution of manganese nitrate and cerium nitrate, soaked for 12 hours, and then dried in a water bath to complete the loading by dipping. Then it was dried at 120°C for 12h, and finally calcined at 350°C for 5h under the protection of nitrogen atmosphere to obtain the catalyst. Mn and Ce in the catalyst account for 30% and 5% of the overall mass of the catalyst including glass fibers, respectively.

[0053] 3) Activity test

[0054] The activity experiment was carried out on a fixed-bed reactor, the loading amount of the catalyst was 2ml, and the particle size wa...

Embodiment 2

[0056] 1) Preparation of the carrier

[0057] Directly use diatomaceous earth as the carrier.

[0058] 2) Catalyst loading

[0059] After dissolving manganese nitrate and cobalt nitrate, diatomaceous earth was placed in it to soak for 24 hours, and then dried in a water bath to complete the loading by impregnation. Then dry at 100° C. for 24 hours, and finally calcinate at 450° C. in air for 4 hours to obtain a catalyst. Mn and Co in the catalyst account for 40% and 10% of the overall mass of the catalyst including diatomaceous earth, respectively.

[0060] 3) Activity test

[0061] The activity experiment was carried out on a fixed-bed reactor, the loading amount of the catalyst was 2ml, and the particle size was 40-60 mesh. The initial gas concentration is: NO and NH 3 Both are 1000ppm, O 2 3%, the rest is N 2 . The reaction space velocity is 60000h -1 , when the reaction temperature is 120°C, the denitrification efficiency is 85.2%, and when the reaction temperatur...

Embodiment 3

[0063] 1) Preparation of the carrier

[0064] Calcinate the granular glass fiber in a muffle furnace at 600°C for 2 hours, take it out, acidify it with a 20% hydrochloric acid solution for 6 hours, wash it with distilled water until neutral, dry it at 120°C, and crush it with a pulverizer Crush to 40 mesh.

[0065] The diatomite is used directly, wherein the mass ratio of diatomite / (diatomite+glass fiber) is 60%.

[0066] 2) Catalyst loading

[0067] After dissolving manganese nitrate, place diatomaceous earth and glass fiber in it to soak for 24 hours, and then carry out water bath drying to complete the loading by dipping method. Then it was dried at 100°C for 24 hours, and finally calcined at 450°C in air for 4 hours to obtain the catalyst. Mn in the catalyst accounts for 20% of the overall mass of the catalyst including the carrier.

[0068] 3) Activity test

[0069] The activity experiment was carried out on a fixed-bed reactor with a catalyst loading of 2ml and part...

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PUM

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Abstract

The invention relates to a low-temperature smoke denitration SCR (silicon controlled rectifier) catalyst, which comprises a carrier, a manganese oxide, and composite oxide of one or more of Ce, Zr, Ti, Co, Fe and Cu, the mass content of manganese is 0.1-66 percent, and the total mass content of the Ce, Zr, Ti, Co, Fe or / and Cu is 0-50 percent; and glass fiber and / or kieselguhr is used as the carrier, wherein the glass fiber of the carrier is calcined for 2-4 hours at temperature of 400-600 DEG C, then placed in a nitric acid, sulfuric acid or hydrochloric acid solution with mass concentration of 5-40 percent for acidizing for 1-8 hours, washed by distilled water to be neutered, dried at temperature of 80-120 DEG C, and crushed to have the fineness of 20-325 meshes. The catalyst uses the glass fiber and the kieselguhr as the carriers, so that the dispersion effect of nanoparticles and specific surface area of the catalyst are increased, the high adsorptive capacity and strong heat resistance and corrosion resistance capacity are achieved, stronger toxic resistance capacity to sulfur dioxide and stream contained in the smoke is realized, the invention can be used for 10-200 DEG C of low temperature smoke denitration, and has strong water resisting and sulphur toxic resisting capacities.

Description

technical field [0001] The invention relates to the field of flue gas denitrification of coal-fired boilers, used for 3 The invention relates to a catalyst for selective catalytic reduction and removal of NOx in flue gas as a reducing agent, in particular to a low-temperature flue gas denitrification SCR catalyst with glass fiber and diatomite as a carrier and a preparation method thereof. Background technique [0002] With the continuous growth of energy consumption, stationary sources, mainly coal-fired boilers, emit more and more nitrogen oxides into the atmosphere. NOx is the main pollutant that causes air pollution problems such as acid rain, photochemical smog, and increased ozone concentration near the ground. Therefore, NOx emission reduction technology has always been the focus of attention of various countries. With the promulgation of the domestic "Nitrogen Oxide Prevention and Control Technology Policy for Thermal Power Plants" and the revision of GB13223 "Emiss...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/889B01J37/02B01D53/56B01D53/86
Inventor 王忠渠刘健民曹沂胡宇峰王小明薛建明盛重义
Owner GUODIAN SCI & TECH RES INST
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