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Low-temperature high-efficiency denitration agent and preparation method thereof

A denitrification agent and high-efficiency technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as large influence of low-temperature denitrification technology working conditions, human health and environmental hazards, and complex catalyst preparation processes , to avoid ammonia consumption and escape problems, less influence of working conditions and easy replacement

Pending Publication Date: 2021-03-09
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Low temperature denitrification technology is greatly affected by working conditions in practical application, and the research and development technology at home and abroad is still relatively immature
Patents (CN103055848A), (CN105032387A), and (CN106311213A) are several technical patents specifically for low-temperature denitrification, among which the patent (CN103055848A) uses manganese oxide as the active component, cerium oxide and iron oxide as promoters, and titanium dioxide as the carrier; The preparation method is to add various metal nitrate solutions into the metatitanic acid slurry, adjust the pH with concentrated ammonia water until the precipitation is complete, and then obtain the finished product after stirring, filtering, drying, and calcination. The preparation process of the catalyst is complicated and the cost is relatively high. High; patent (CN105032387A) with Cr 2 o 3 , V 2 o 5 as the active component, Ni 2 SO 4 As additive, TiO 2 It is used as a carrier; the preparation method is to add deionized water and chromium nitrate to metatitanic acid in turn, stir evenly, slowly pass through ammonia water to adjust the pH value, then add ammonium metavanadate, monoethanolamine, nickel sulfate hexahydrate in turn, and then stir , centrifuged, dried and calcined to obtain the finished product, the catalyst preparation process is complicated, the cost is high and the active component V 2 o 5 It is highly toxic and easily soluble in water, causing harm to human health and the environment
The above-mentioned low-temperature denitrification catalysts still have certain limitations in practical application.

Method used

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  • Low-temperature high-efficiency denitration agent and preparation method thereof

Examples

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Effect test

example 1

[0028] (1) Mixing of main raw materials

[0029] According to formula design, weigh Ni, Mn, Fe, W transition metal oxide mass percentage content is 2%, 10%, 5% and 3% respectively, K, Ba, Ca alkali / alkaline earth metal oxide mass percentage content 10%, 10% and 50% of the active component powder, and the carrier powder with a mass percentage of silicon-aluminum composite oxide of 8% and a mass percentage of activated carbon of 1%, are placed in the mixer Dry mix for 1 hour at a speed of 150 rpm, and stir evenly;

[0030] (2) Wet practice mud

[0031] Put the powder mixed in step (1) into the mud refining machine, then add sodium silicate with a mass percentage of 1% according to the metering ratio, and add deionized water with a total mass of 65% of the denitrification agent, at a speed of 20 Stir and knead for 4 hours under rpm, and finally knead into mud suitable for extrusion;

[0032] (3) Body preparation

[0033] Put the mud after mixing in step (2) into a molding mac...

example 2

[0039] (1) Mixing of main raw materials

[0040] According to formula design, take by weighing Zn, Cu, W, Mo transition metal oxide mass percentage content is respectively 5%, 10%, 4% and 1%, Na, Mg alkali / alkaline earth metal oxide mass percentage content are respectively 40% and 10% of the active component powder, and the silicon-aluminum composite oxide mass percentage content is 15%, the carrier powder with a porous molecular sieve mass percentage content of 5%, is placed in a mixer at a speed of 70 Dry mix for 4 hours at rpm, stir evenly;

[0041] (2) Wet practice mud

[0042] Put the powder mixed in step (1) into the mud refining machine, and then add colloidal silicon dioxide with a mass percentage of 5% and sodium silicate with a mass percentage of 5% according to the metering ratio, and add the denitration agent as a whole Deionized water with a mass of 45% was stirred and kneaded for 1 hour at a speed of 40 rpm, and finally kneaded into a slurry suitable for extrus...

example 3

[0050] (1) Mixing of main raw materials

[0051] According to formula design, weigh Ce, Mn, Cu, Mo transition metal oxide mass percentage content is respectively 1%, 3%, 5% and 1%, Na, Ca alkali / alkaline earth metal oxide mass percentage content is respectively 10% and 10% active component powders, and silicon-aluminum composite oxide mass percentage content is 50%, activated carbon mass percentage content is 2%, porous molecular sieve mass percentage content is 10% carrier powder, put Put it into the mixer and dry mix it for 2 hours at a speed of 120 rpm, and stir evenly;

[0052] (2) Wet practice mud

[0053] Put the powder mixed in step (1) into the mud refining machine, and then add colloidal silicon dioxide with a mass percentage of 1% and sodium silicate with a mass percentage of 4% according to the metering ratio, and add a denitration agent as a whole Deionized water with a mass of 50% was stirred and kneaded for 2 hours at a speed of 30 rpm, and finally kneaded into...

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Abstract

The invention relates to a low-temperature high-efficiency denitration agent, which is characterized in that an active component is a composite metal oxide consisting of a transition metal oxide and an alkali or alkaline-earth metal oxide; a carrier is a composite carrier consisting of one or two of activated carbon or a molecular sieve and a silicon-aluminum composite oxide; a forming aid is oneor two of sodium silicate or colloidal silicon dioxide; wherein the mass percentage of the active component is 30%-90%, the mass percentage of the carrier is 9%-62%, and the mass percentage of the forming aid is 1%-10%. The preparation method is an integrated extrusion molding process and comprises the following steps: drying and roasting to obtain a denitration agent finished product. The denitration agent is low in temperature, efficient, simple in preparation process and low in roasting temperature. Compared with denitration technologies such as SNCR and SCR, the denitration agent providedby the invention has obvious application characteristic advantages, does not need to consume reducing agents such as NH3, avoids the problems of ammonia consumption and escape, has no additional operation cost, is convenient to use and easy to replace, is less influenced by working condition factors, and breaks through the application bottleneck of low-temperature denitration.

Description

technical field [0001] The invention provides a low-temperature high-efficiency denitrification agent and a preparation method thereof, which belong to the fields of air pollution control technology and environmentally friendly catalytic new materials. Background technique [0002] Nitrogen oxides (NO x ) is one of the main causes of acid rain and smog, and has become the focus of air pollution control. [0003] At present, flue gas denitrification technologies that are widely used mainly include selective catalytic reduction technology (SCR), selective non-catalytic reduction technology (SNCR), plasma, wet flue gas denitrification, etc., among which SCR has high denitrification efficiency and good stability. , has become the mainstream denitrification technology in all countries in the world; and the above denitrification technology is mainly suitable for medium and high temperature denitrification, and the project cost is relatively high. It is generally used in large boi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/888B01D53/86B01D53/56
CPCB01J23/8892B01J23/8898B01J23/888B01J23/8885B01D53/8628B01D2258/0283
Inventor 沈岳松陈蒙蒙
Owner NANJING UNIV OF TECH
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