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A low-temperature high-activity flue gas denitrification catalyst and its preparation

A denitration catalyst and catalyst technology, applied in the field of environmental protection, can solve the problems of reduced denitration efficiency and unsuitability for industrial application, and achieve the effects of low production cost, high selectivity, and low denitration reaction temperature

Active Publication Date: 2021-12-28
北京大学包头创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

V 2 o 5 The / AC catalyst is affected by the desulfurization products in the flue gas, and the denitrification efficiency is significantly reduced, which is not suitable for industrial application

Method used

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  • A low-temperature high-activity flue gas denitrification catalyst and its preparation
  • A low-temperature high-activity flue gas denitrification catalyst and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Commercially available semi-coke is mechanically formed (purchased from the manufacturer: Derun Coal Preparation Equipment Co., Ltd. in Yulin, Shaanxi, the following examples are all the same, and it contains the following moisture in terms of mass: 17.96; ash content 20.12; volatile matter 29.19; fixed carbon 50.69; total sulfur 1.20), hole density 100-300 holes / inch 2 . Take 20% dilute nitric acid to impregnate the semi-coke carrier in excess, impregnate and activate for 2 hours, impregnate with ultrasonic (Ningbo Xinzhi Biotechnology Co., Ltd. Above, semi-coke after activation treatment is impregnated with Al in excess 2 o 3 Sol, pre-configured with a mass fraction of 1% Al 2 o 3 The solution was ultrasonically loaded for 2 hours, then dried at 110°C and fixed by calcining at 400°C for 3 hours; the soluble Mn salt was prepared as an aqueous solution with a mass fraction of 5% (calculated as manganese content), and the soluble Mn salt was manganese nitrate. The a...

Embodiment 2

[0071] Mechanically mold the commercially available semi-coke with a hole density of 100-300 holes / inch 2 , activated by 10% dilute nitric acid, ultrasonically impregnated at room temperature for 4 hours, and then dried at a constant temperature of 110°C for 2 hours; on this basis, the activated semi-coke was impregnated with Al 2 o 3 Sol, Al used 2 o 3 The mass fraction is 1.5%. After ultrasonic loading for 2 hours, it is dried at 110°C for 2h and then calcined at 400°C for 2h to fix; Ultrasonic impregnation at 30°C for 3h, drying at a constant temperature of 110°C for 2h and calcination at 450°C for 3h; the Ce(NO 3 ) 3 ·6H 2 O and the acidic ligand 1,4-phthalic acid used are pre-mixed uniformly at a molar ratio of 1:1.5 and configured to contain Ce(NO 3 ) 3 The mass fraction is 2% aqueous solution, citric acid adjusts the pH value to 6, and the load is impregnated by ultrasonic for 2 hours, dried at 110°C for 3 hours and calcined at 450°C for 2 hours; calcined in N 2...

Embodiment 3

[0074] Mechanically mold commercially available semi-coke with a hole density of 100-300 holes / inch 2 , take 25% dilute nitric acid to impregnate semi-coke in excess for activation, activate by ultrasonic impregnation at room temperature for 3 hours, and then dry at a constant temperature of 110°C for 2 hours; the activated semi-coke is excessively impregnated to load Al 2 o 3 Sol, Al used 2 o 3 The mass fraction is 2%. After ultrasonic loading for 2 hours, it is dried at 110°C for 3 hours and fixed at 450°C for 3 hours; the carrier is immersed in a soluble manganese nitrate solution, wherein the solution is a pre-configured The aqueous solution with a fraction of 8% was ultrasonically impregnated at room temperature at 30°C for 2h on the basis of the above, dried at a constant temperature of 110°C for 3h and calcined at 350°C for 3h to fix; the Ce(NO 3 ) 3 ·6H 2 O and the acidic ligand 1,4-phthalic acid used are mixed uniformly at a molar ratio of 1:2.0, and configured t...

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Abstract

The invention relates to a rare earth-containing flue gas denitrification catalyst and its preparation. The catalyst uses a carbon-based material as a carrier and is loaded with active Al 2 o 3 , any one or several metal active components in Mn, Cu and Fe, and any one or both rare earth active components in Ce and La; wherein, the carbon-based carrier content is 35-65%, and the Said Al 2 o 3 The loading content of the aluminum element content is 2-5%, the metal active component loading content is 13-26% based on the metal element content, and the rare earth active component loading content is 20-39% based on the rare earth element content . The catalyst is obtained by activating the carbon-based material with dilute nitric acid, coating alumina sol, loading metal active components and rare earth active components, and finally drying and calcining in an inert atmosphere. The invention obtains a catalyst with high flue gas denitrification catalytic efficiency at low temperature (90-120° C.) and less prone to poisoning and failure. The production cost is low and the production process is simple, especially suitable for enterprises with large smoke emissions such as thermal power plants, steel plants and sintering plants.

Description

technical field [0001] The invention relates to a catalyst in the field of environmental protection, which is mainly used in the field of flue gas denitration, in particular to a low-temperature and high-efficiency denitration catalyst and a preparation method thereof. Background technique [0002] With the rapid development of China's economy, the consumption of coal energy is also increasing day by day. The sulfur oxides and nitrogen oxides produced in the process of coal combustion are one of the main sources of air pollution. Therefore, efficient and reasonable control of flue gas emissions has become a An important strategy for modern development. [0003] Flue gas desulfurization (FGD), limestone / gypsum method has become the most widely used and most mature flue gas desulfurization process in the world because of its wide range of coal types, stable operation, good operating flexibility, and easy availability of desulfurizers. [0004] Flue gas denitrification is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/83B01D53/86B01D53/56
Inventor 王习东方斌正张娜高小龙韩佳丽曹建伟李慧张伟
Owner 北京大学包头创新研究院
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