Rare-earth-based SCR denitration catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., to achieve the effect of simple preparation method, wide operating temperature window, and improved denitrification performance

Inactive Publication Date: 2017-02-22
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the problems existing in the existing catalysts, to provide a rare earth-ba

Method used

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  • Rare-earth-based SCR denitration catalyst and preparation method thereof
  • Rare-earth-based SCR denitration catalyst and preparation method thereof
  • Rare-earth-based SCR denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] Synthesize 5% CeO by dipping method 2 / 5%WO 3 -TiO 2 (Mass ratio) The catalyst is used for flue gas SCR denitration. The specific implementation steps are as follows:

[0026] Weigh 0.974g Ce(CH 3 COO) 3 ·H 2 O In a 200 mL beaker, add 100 mL deionized water and 10 g 5% WO 2 -TiO 2 , Ultrasonic treatment for 1 h, magnetic stirring for 6 h, 110 o Dry overnight at C, 500 o Roasting at C for 4 h (heating rate is 5 o C / min) to get the required 5% CeO 2 / 5% WO 3 -TiO 2 catalyst.

[0027] The catalyst synthesized by the above method is used for SCR denitration performance test: 0.4 g of catalyst is placed in a fixed bed reactor, and the reaction gas composition is (volume ratio) 500 ppm NO and 500 ppm NH 3 , 5% O 2 , Ar is carrier gas, space velocity (GHSV) is 20 000 h -1 . The gas detection system is a Fourier transform infrared analyzer equipped with a gas cell.

[0028] 5%CeO 2 / 5% WO 3 -TiO 2 The catalyst denitration performance test results are as follows:

[0...

Example Embodiment

[0030] Example 2:

[0031] Synthesize 10% CeO by dipping method 2 -10%WO 3 / TiO 2 (Mass ratio) The catalyst is used for flue gas SCR denitration. The specific implementation steps are as follows:

[0032] Weigh 1.261 g Ce(NO 3 ) 3 ·6H 2 O, 0.518 g (NH 4 ) 6 W 7 O 24 ·6H 2 O In a 100 mL beaker, add 50 mL deionized water and 4 g carrier TiO 2 , Ultrasonic treatment for 1 h, magnetic stirring for 1 h, 110 o Dry overnight at C, 500 o Roasting at C for 4 h (heating rate is 5 o C / min) to get the required 10% CeO 2 -10%WO 3 / TiO 2 catalyst.

[0033] The catalyst synthesized by the above method was used for the SCR denitration performance test, and the test conditions were the same as in Example 1.

[0034] 10% CeO 2 -10%WO 3 / TiO 2 The catalyst denitration performance test results are as follows:

[0035]

Example Embodiment

[0036] Example 3:

[0037] Synthesize Ce by co-precipitation 0.2 Mo 0.1 TiO y (Molar ratio) The catalyst is used for flue gas SCR denitration, the specific implementation steps are as follows:

[0038] Weigh 3.799 g Ce(NO 3 ) 3 ·6H 2 O, 0.772 g (NH 3 ) 6 Mo 7 O 24 ·4H 2 O and 10.5 g Ti(SO 4 ) 2 In 250mL deionized water, stir well and add NH dropwise 3 ·H 2 O to pH=10, aging at room temperature for 4 hours, suction filtration, washing, 110 o Dry overnight at C, 500 o Calcination at C for 5 h (heating rate is 5 o C / min) to get the required Ce 0.2 Mo 0.1 TiO y catalyst.

[0039] The catalyst synthesized by the above method was used for the denitration performance test, and the test conditions were the same as in Example 1.

[0040] Ce 0.2 Mo 0.1 TiO y The catalyst denitration performance test results are as follows:

[0041]

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Abstract

The invention relates to a rare-earth-based SCR denitration catalyst and a preparation method thereof, and belongs to the technical field of environmental catalysis. The catalyst is a denitration catalyst which is compounded from CeO2 and TiO2 at the medium and low temperature, the active component of the catalyst is cerium dioxide, the carrier is titanium dioxide, and the assistant is transition metal and rare earth metal oxide; and the structural formula of the catalyst is CeO2-MOx/TiO2, CeO2/Mox-TiO2 or CeMTiOy, wherein M is one or several kinds of compounds selected from Al, Si, Y, Zr, Nb, Mo, Sn, Sb, La, Pr, Nd, Sm and W, x ranges from 1 to 3 and y ranges from 2 to 5. The invention has the advantages that no toxic substance V2O5 is used in the catalyst, the catalyst has good NO(i) x(/i) conversion rate, N2 selectivity and NH3 conversion rate in the range of 200-500 DEG C, the SO2 conversion rate is small, the H2O and alkali metal poisoning prevention capability is superior to that of commercial vanadium-titanium catalysts.

Description

technical field [0001] The present invention relates to a kind of nitrogen oxide (NO x ) flue gas and NO of similar composition x The invention discloses a rare earth-based catalyst for removing polluted gases and a preparation method thereof, in particular to a rare earth-based SCR denitrification catalyst and a preparation method thereof, and belongs to the technical field of environmental catalysis. [0002] technical background [0003] NO x It is not only the main contributor to acid rain, but also the prerequisite for the formation of near-surface atmospheric ozone pollution, photochemical smog, secondary fine particle pollution, and surface eutrophication. The problems caused by this have become the most prominent along with ozone layer destruction and global climate change. Atmospheric environmental hotspot issues. [0004] At present, the SCR method is considered to be the best denitrification technology. It uses ammonia or other reducing agents to selectively red...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01J23/28B01D53/86B01D53/56
CPCB01J23/002B01D53/8628B01J23/26B01J23/28B01J2523/00B01J2523/3712B01J2523/47B01J2523/31B01J2523/41B01J2523/36B01J2523/48B01J2523/56B01J2523/68B01J2523/43B01J2523/53B01J2523/3706B01J2523/3718B01J2523/3725B01J2523/3737
Inventor 李兆强王艳马志鸿
Owner BAOTOU RES INST OF RARE EARTHS
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