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A kind of low-temperature denitrification catalyst and preparation method thereof

A low-temperature denitration and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc. Can, avoid secondary pollution, long service life effect

Active Publication Date: 2021-05-04
成都达奇科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the temperature of the exhaust gas is generally 80 degrees, and the denitration temperature of the titanium-based catalyst is relatively high (300~400 degrees C), so the SCR device can only be arranged between the economizer and the air preheater, but here the flue gas There is a large amount of fly ash, which contains alkali metals, arsenic and mercury, etc., which will corrode and poison the catalyst, lead to catalyst deactivation, and reduce its service life. At the same time, the application temperature window is narrow; on the other hand, the vanadium in this type of catalyst Components are easy to lose, causing harm to the environment and human body

Method used

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preparation example Construction

[0028] The present invention also provides a preparation method for preparing the above-mentioned denitrification material, comprising the following steps:

[0029] Step 1: Prepare activated carbon. The activated carbon was raised to 350-500°C at a rate of 3-10°C / min in a furnace (a tubular electric furnace was used in this example), and N 2 Protection, heating up to 350~500°C for 1~2h, feeding O during the constant temperature process 2 and CO 2 mixed gas instead of N 2 , where O 2 The content is 5%~25%, CO 2 The content is 75%~95%.

[0030] This step uses clean and pollution-free oxygen and CO 2 The carrier material is modified, the modification process is environmentally friendly and pollution-free, and the O 2 and CO 2 The synergistic effect of the carrier further optimizes and adjusts the pore structure of the carrier to increase its oxygen-containing functional groups and reaction interface to obtain a low-temperature denitration catalyst carrier with excellent per...

specific Embodiment 1

[0038] Step 1: Prepare activated carbon. The activated carbon was heated to 350°C at a rate of 3°C / min in the furnace, and N 2 protection, the temperature was raised to 350°C for 1 hour, and O was introduced during the constant temperature process. 2 and CO 2 mixed gas instead of N 2 , where O 2 content of 5% and CO 2 The content is 95%.

[0039] Step 2: preparing the catalytic component. With Ce(NO 3 ) 2 .6H 2 O, ZrOCO 3 , La(NO 3 ) 3 .6H 2 O, Y (NO 3 ) 3 .6H 2 O is the raw material, and the above-mentioned groups are formulated into a 10% mass fraction of cerium-zirconium-lanthanum-yttrium mixed salt solution according to the weight percentage of 65%: 33%: 0.9%: 1.1%, and then 30% of H is added to the mixed solution. 2 o 2 and 10% PVA solution, the amount added is the same as that of Ce(NO 3 ) 2 .6H 2 The molar ratio of O is 1:1, the above solutions are mixed and the volume is adjusted to 1.5L. After constant volume, stir for 0.5h to obtain the prepared ...

specific Embodiment 2

[0044] Step 1: Prepare activated carbon. The activated carbon was heated to 500°C at a rate of 10°C / min in the furnace, and N 2 protection, heating up to 500°C for 2 hours, and feeding O during the constant temperature process 2 and CO 2 mixed gas instead of N 2 , where O 2 The content is 25%, CO 2 The content is 75%.

[0045] Step 2: preparing the catalytic component. With Ce(NO 3 ) 2 .6H 2 O, ZrOCO 3 , La(NO 3 ) 3 .6H 2 O, Y (NO 3 ) 3 .6H 2 O is the raw material, and the above-mentioned groups are formulated into a 10% mass fraction of cerium-zirconium-lanthanum-yttrium mixed salt solution according to the weight percentage of 65%: 33%: 0.9%: 1.1%, and then 30% of H is added to the mixed solution. 2 o 2 and 10% PVA solution, the amount added is the same as that of Ce(NO 3 ) 2 .6H 2 The molar ratio of O is 1:1, the above solutions are mixed and the volume is adjusted to 1.5L. After constant volume, stir for 0.5h to obtain the prepared catalytic component ...

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Abstract

The invention provides a low-temperature denitration catalyst and a preparation method thereof, comprising a microporous activated carbon material as a carrier component and ZrO as an active component 2 , CeO 2 , La 2 o 3 , Y 2 o 3 . The present invention can effectively adsorb nitrate, and when used in combination with a fixed bed, the effect is better.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a low-temperature denitrification catalyst and a preparation method thereof. Background technique [0002] With the development of modern industrial production, air pollution has become a widespread concern, and nitrogen oxides NO x Since the 1970s, the problem of air pollution in China has been gradually paid attention to. After research, it was found that NO x Not only will it cause photochemical smog, but it will also endanger human health, cause high-level nitric acid rain, reduce the ozone layer, and other problems, resulting in serious air pollution. [0003] At present, the mainstream denitrification technology in the market is selective catalytic reduction (SCR) technology. SCR removal of nitrogen oxides is a mature flue gas denitrification technology. It is 80~90% higher, suitable for large exhaust and continuous emission sources, and has bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J23/002B01J23/10B01J2523/00B01J2523/3706B01J2523/3712B01J2523/36B01J2523/48
Inventor 李新尹华强
Owner 成都达奇科技股份有限公司