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Filler type wet denitration catalyst and preparation method thereof

A wet denitrification and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of complex liquid regeneration, which is not well solved, low investment, low operating temperature and operating costs , The problem of high temperature of the catalyst reaction window, it is easy to adjust the flow rate and gas flow rate, the catalytic effect is good, and the effect of continuous feeding is achieved.

Inactive Publication Date: 2020-06-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the many denitrification technologies, SCR technology is the most used and most mature nowadays, but with the continuous improvement of its shortcomings, it has reached the optimal state, but there are still problems such as ammonia escape, catalyst reaction window temperature is too high, catalyst is easy to poison, etc. If you want to achieve a better denitrification effect, you must develop other new processes
The overall equipment investment, operating temperature and operating cost of complexation denitrification in wet denitrification are relatively low, but the problem of regeneration of complexation fluid has not been solved well, which hinders the industrial operation of this technology

Method used

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  • Filler type wet denitration catalyst and preparation method thereof
  • Filler type wet denitration catalyst and preparation method thereof
  • Filler type wet denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1. Preparation of packing type wet denitration catalyst

[0038] Weigh 3g of palladium chloride solid, 2ml of dispersant polyethylene glycol, and 100ml of distilled water into a beaker, heat and mix evenly in a water bath at 50°C; to about 10 to make a colloid; add the treated honeycomb ceramic carrier to the colloid for 3 hours, put it in an oven and dry it at 80°C; after drying, put it in a microwave muffle furnace and bake it at 500°C for 3 hours, and cool it naturally to Room temperature; take the semi-finished catalyst and soak it in the mixture of ethanol and water (volume ratio 3:1), add sodium borohydride to it for full reduction; after the reduction, wash with distilled water, dry at 80°C after washing, Get target catalyst. Wherein the palladium elemental content is 0.72%.

[0039] In this embodiment, the experimental evaluation of NO decomposition is to adopt figure 1 The experimental system shown is carried out, and the process is: use 150g of cat...

Embodiment 2

[0040] Embodiment 2. Preparation of packing type wet denitration catalyst

[0041] Weigh 1g of palladium chloride solid, 2ml of dispersant polyethylene glycol, and 100ml of distilled water into a beaker, heat and mix evenly in a water bath at 50°C; after the palladium chloride is completely dissolved, add an appropriate amount of aluminum sol, and drop ammonia to adjust Make a colloid at about 10°C; put the catalyst loaded with 0.72% active components into the beaker for impregnation for 3h, put it in an oven and dry it at 80°C; after drying, put it in a microwave muffle furnace and bake it at 500°C for 3h , naturally cooled to room temperature; take the semi-finished catalyst, and soak it in the mixed solution of ethanol and water (volume ratio 3:1), add sodium borohydride to it and carry out sufficient reduction; °C to obtain the target catalyst. Wherein the palladium simple substance content is 0.81%.

[0042] In this embodiment, the experimental evaluation of NO decompos...

Embodiment 3

[0043] Embodiment 3. Preparation of packing type wet denitration catalyst

[0044] Weigh 1g of palladium chloride solid, 2ml of dispersant polyethylene glycol, and 100ml of distilled water into a beaker, heat and mix evenly in a water bath at 50°C; after the palladium chloride is completely dissolved, add an appropriate amount of aluminum sol, and drop ammonia to adjust Make a colloid at about 10°C; put the catalyst loaded with 0.81% active components into the beaker for immersion for 3 hours, put it in an oven and dry it at 80°C; after drying, put it in a microwave muffle furnace and bake it at 500°C for 3 hours , naturally cooled to room temperature; take the semi-finished catalyst, and soak it in the mixed solution of ethanol and water (volume ratio 3:1), add sodium borohydride to it and carry out sufficient reduction; °C to obtain the target catalyst. Wherein the palladium simple substance content is 0.93%.

[0045] In this embodiment, the experimental evaluation of NO d...

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Abstract

The invention provides a filler type wet denitration catalyst and a preparation method thereof. The filler type wet denitration catalyst is mainly prepared from the following raw materials in percentage by weight: 98-99% of a honeycomb ceramic carrier and 0.5-2% of palladium chloride. According to the method, a filler type catalyst capable of being continuously used in wet denitration is preparedby taking a cordierite honeycomb ceramic as a carrier and palladium as an active ingredient; and the method specifically comprises the following steps: weighing palladium chloride and polyethylene glycol, adding distilled water, and mixing in a water bath kettle; adding alumina sol after dissolving the palladium chloride, and adding ammonia water in a dropwise manner to prepare colloid; adding thecarrier subjected to acid etching into a beaker, dipping, then putting into a drying oven, drying, then putting into a microwave muffle furnace, and roasting at 500 DEG C for 3 hours; putting the semi-finished catalyst into a beaker, adding a mixed solution of ethanol and water until the mixed solution submerges the solid, weighing a corresponding amount of sodium borohydride, adding the sodium borohydride into the beaker, and sufficiently reducing; and washing and drying to obtain the target catalyst. According to the invention, the problem of ammonia escape in the SCR process is solved, andthe integration of absorption and catalytic reduction is realized.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a method for preparing a filler type wet denitration catalyst in wet denitration and designing a filler absorption column used therein. The catalyst can obtain high denitrification rate at low temperature, and it works stably, with short preparation period and no ammonia escape. It can be used not only for the denitrification treatment of ship and automobile exhaust, but also for the denitrification treatment of industrial waste gas. Background technique [0002] Nitrogen oxides (the main component is NO) in exhaust gas is one of the main pollutants in the atmosphere. Due to the drastic increase in the use of fossil fuels, the total annual emission of NOx in the world exceeds 30 million tons, and it is still growing. NOx It has become an air pollutant second only to inhalable particulate matter and has a great impact on human production and life. Therefore, reduci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J37/02B01J37/16B01D53/78B01D53/56B01D53/86
CPCB01D53/78B01D53/8628B01J23/44B01J37/0207B01J37/0211B01J37/16
Inventor 张光旭刘士豪郭雪花许超汪义超王浩强
Owner WUHAN UNIV OF TECH
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