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Rare earth-based SCR catalyst for diesel oil vehicle and preparation method of rare earth-based SCR catalyst

A kind of SCR catalyst, rare earth-based technology, applied in the field of rare earth-based SCR catalyst and preparation for diesel vehicles, can solve the problem of low conversion rate, achieve good low temperature performance, superior resistance to sulfur poisoning, and wide operating temperature window

Active Publication Date: 2017-06-06
BAOTOU RES INST OF RARE EARTHS +1
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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 aimed at the existing diesel vehicle catalyst at about 200 ℃ NO x To solve the problem of low conversion rate, provide a rare earth-based SCR catalyst for diesel vehicles with low cost, high low-temperature activity, wide operating temperature window, good water and sulfur dioxide resistance, simple preparation method, and environmental friendliness and its preparation method

Method used

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  • Rare earth-based SCR catalyst for diesel oil vehicle and preparation method of rare earth-based SCR catalyst
  • Rare earth-based SCR catalyst for diesel oil vehicle and preparation method of rare earth-based SCR catalyst
  • Rare earth-based SCR catalyst for diesel oil vehicle and preparation method of rare earth-based SCR catalyst

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Effect test

Embodiment 1

[0028] A method for preparing a rare earth-based SCR catalyst for diesel vehicles with good low-temperature performance and a wide operating temperature window. The specific synthesis steps are as follows:

[0029] (1) Slurry preparation: Weigh 48g of rare earth-based powder and add 20g of glutinous rice glue into 120mL of deionized water. For the rare earth-based powder, the cerium-niobium composite oxide contained is 10% of the total powder mass, the iron-copper composite oxide is 2% of the total powder mass, rhenium oxide is 0.28% of the total powder mass, and the rest is titanium Tungsten powder, the synthesis method is the traditional deposition precipitation method, and the precipitation agent is ammonia water.

[0030] (2) Slurry ball mill: The slurry is ground by a planetary ball mill with a speed of 400 rpm and a running time of 10 minutes. The final slurry particle size is D 50 is 721 nm.

[0031] (3) Add microcrystalline cellulose: add 0.068 g of microcrystalline ...

Embodiment 2

[0036] A method for preparing a rare earth-based SCR catalyst for diesel vehicles with good low-temperature performance and a wide operating temperature window. The specific synthesis steps are as follows:

[0037] (1) Slurry preparation: Weigh 48g of rare earth-based powder and add 24g of glutinous rice glue into 120mL of deionized water. For the rare earth-based powder, the cerium-lanthanum composite oxide contained is 13% of the total powder mass, the manganese-samarium composite oxide is 2.5% of the total powder mass, the rhenium oxide is 0.28% of the total powder mass, and the rest is titanium Tungsten powder, the synthesis method is the traditional deposition precipitation method, and the precipitation agent is ammonia water.

[0038] (2) Slurry ball mill: The slurry is ground by a planetary ball mill with a speed of 400 rpm and a running time of 10 minutes. The final slurry particle size is D 50 is 615 nm.

[0039] (3) Add microcrystalline cellulose: add 0.180 g of mi...

Embodiment 3

[0044] A method for preparing a rare earth-based SCR catalyst for diesel vehicles with good low-temperature performance and a wide operating temperature window. The specific synthesis steps are as follows:

[0045] (1) Slurry preparation: Weigh 48g of rare earth-based powder and add 28g of glutinous rice glue into 120mL of deionized water. For the rare earth-based powder, the cerium-tin composite oxide contained is 13.5% of the total powder mass, the copper-hafnium composite oxide is 3.1% of the total powder mass, rhenium oxide is 0.35% of the total powder mass, and the rest is titanium Tungsten powder, the synthesis method is the traditional deposition precipitation method, and the precipitation agent is ammonia water.

[0046] (2) Slurry ball mill: The slurry is ground by a planetary ball mill with a speed of 400 rpm and a running time of 10 minutes. The final slurry particle size is D 50 at 586 nm.

[0047] (3) Adding microcrystalline cellulose: adding 0.279 g of microcry...

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Abstract

The invention relates to a rare earth-based SCR catalyst for a diesel oil vehicle and a preparation method of the rare earth-based SCR catalyst. According to the catalyst, cordierite honeycomb ceramic is taken as a carrier and is coated with coating layer slurry, and the coating layer slurry mainly contains rare earth-based powder, a binder, an additive and water; and the rare earth-based powder contains the following four active components: the first active component is one or more of cerium-niobium composite oxide, cerium-tin composite oxide, cerium-yttrium composite oxide and cerium-lanthanum composite oxide, the second active component is one or more of manganese-samarium composite oxide, zirconium-hafnium composite oxide, zinc-erbium composite oxide, iron-copper composite oxide, copper-hafnium composite oxide and zirconium-aluminum composite oxide, the third active component is rhenium oxide, and the fourth active component is titanium-tungsten powder. The rare earth-based SCR catalyst has the advantages that the low temperature performance is good, an operation temperature window is wide, and the conversion rate of NOx reaches above 70% at 150 DEG C, is more than 90% at 180 DEG C and is 100% at 200-500 DEG C.

Description

technical field [0001] The invention relates to a rare earth-based SCR catalyst for diesel vehicles and a preparation method thereof, and belongs to the technical field of catalytic reduction method for purifying motor vehicle exhaust emissions. Background technique [0002] Due to the incomparable advantages of gasoline engines in terms of power, economy and reliability, diesel engines, especially CO 2 With low emissions, its application is no longer limited to the power system of marine and large commercial passenger vehicles, but has been gradually extended to various types of vehicles. The share of diesel cars in the European and American markets has reached more than 40%. The Chinese government also strongly supports the development of diesel vehicles in the planning of the automobile industry. But at the same time, nitrogen oxides (NO x ) and other pollution discharge problems are becoming increasingly prominent, NO x It is one of the main culprits of acid rain, pho...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/36B01D53/94B01D53/56
CPCB01D53/9418B01D2258/012B01J23/002B01J23/36B01J23/8896B01J2523/00B01J2523/17B01J2523/3712B01J2523/47B01J2523/56B01J2523/69B01J2523/74B01J2523/842B01J2523/3706B01J2523/3737B01J2523/72B01J2523/43B01J2523/49Y02A50/20Y02T10/12
Inventor 李兆强王艳赵文怡张丞马志鸿张旭霞王荣宋静
Owner BAOTOU RES INST OF RARE EARTHS
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