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Catalyst for treating leaked ammonia of selective catalytic reduction device and preparation method of catalyst

A device leakage and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of deteriorating diesel engine NOx emissions, high cost of raw materials, poor resistance to sulfur and heat aging, etc., to achieve Efficient collaborative purification and reliable purification effect

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the main active ingredient of this type of catalyst is noble metal platinum, not only the cost of raw materials is high, but also the effect of sulfur resistance and thermal aging resistance is poor. NH 3 Partial oxidation reactions have good selectivity, resulting in NH leakage from SCR devices under some operating conditions 3 A deep oxidation reaction occurs to generate NO, NO 2 etc., thus worsening the NOx emission of the diesel engine again

Method used

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  • Catalyst for treating leaked ammonia of selective catalytic reduction device and preparation method of catalyst
  • Catalyst for treating leaked ammonia of selective catalytic reduction device and preparation method of catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Catalyst composition design:

[0073] External active coating: The mass percentage of Cu and ZSM-5 molecular sieve in the external active component of the external active coating is designed to be 5%: 95%, and CeO in the external auxiliary material 2 , γ-Al 2 o 3 and SiO 2 The mass percentage: 15%: 65%: 20%, γ-Al in the external accessories 2 o 3 Medium pure γ-Al 2 o 3 γ-Al converted from aluminum sol 2 o 3 The mass percentage is 85%: 15%, the mass percentage of the external active component and the external auxiliary material is: 15%: 85%, and it is planned to prepare the external active coating slurry that can be converted into 2000g external active coating at one time.

[0074] Inner active coating: Pd and La in the inner active components of the inner active coating are designed separately 0.8 Ce 0.2 mn 0.7 Ni 0.3 o 3 The mass percentage of perovskite composite oxide is 5%: 95%, CeO in the auxiliary material 2 -ZrO 2 Solid solution and γ-Al 2 o ...

Embodiment 2

[0081] (1) Catalyst composition design:

[0082] External active coating: The mass percentages of Cu and ZSM-5 molecular sieve in the external active components of the external active coating are designed to be 10%: 90%, and CeO in the external auxiliary material 2 , γ-Al 2 o 3 and SiO 2 The mass percentage is 5%: 85%: 10%, and the γ-Al in the external accessories 2 o 3 Medium pure γ-Al 2 o 3 γ-Al converted from aluminum sol 2 o 3 The mass percentage is 80%: 20%, the mass percentage of the external active component and the external auxiliary material is 5%: 95%, and it is planned to prepare the external active coating slurry that can be converted into 2000g external active coating at one time.

[0083] Inner active coating: Pd and La in the inner active components of the inner active coating are designed separately 0.8 Ce 0.2 mn 0.7 Ni 0.3 o 3 The mass percentage of perovskite composite oxide is 10%: 90%, CeO in the auxiliary material 2 -ZrO 2 Solid solution and...

Embodiment 3

[0090] (1) Catalyst composition design:

[0091] External active coating: The mass percentages of Cu and ZSM-5 molecular sieve in the external active components of the external active coating are designed to be 10%: 90%, and CeO in the external auxiliary material 2 , γ-Al 2 o 3 and SiO 2 The mass percentage is 10%: 70%: 20%, and the γ-Al in the external accessories 2 o 3 Medium pure γ-Al 2 o 3 γ-Al converted from aluminum sol 2 o 3 The mass percentage is 85%: 15%, and the mass percentage of the external active component and the external auxiliary material is 15%: 85%. It is planned to prepare an external active coating slurry that can be converted into a 2000g external active coating at one time.

[0092] Inner active coating: Pd and La in the inner active components of the inner active coating are designed separately 0.8 Ce 0.2 mn 0.7 Ni 0.3 o 3 The mass percentage of perovskite composite oxide is 10%: 90%, CeO in the auxiliary material 2 -ZrO 2 Solid solution ...

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Abstract

The invention relates to a catalyst for treating ammonia leakage of a selective catalytic reduction device and a preparation method of the catalyst. The catalyst comprises a carrier, and an inner active coating and an outer active coating which are sequentially coated on the surface of at least part of pore channels of the carrier. The inner active coating and the outer active coating are coated on the surface of at least part of the pore channels of the catalyst carrier to form a double-active-coating structure, the inner active coating can oxidize NH3 leaked by the SCR device into NOx, and efficient and reliable purification of the NH3 leaked by the SCR device is achieved; meanwhile, the SCR catalytic active component of the outer active coating can catalyze the NOx generated by NH3 oxidation and the SCR reaction between the unpurified NOx of the SCR system and the remaining leaked NH3, and therefore efficient collaborative purification of the leaked NH3 of the SCR device and the unpurified NOx is further achieved.

Description

technical field [0001] The disclosure relates to the field of purification of diesel vehicle exhaust pollutants, in particular to a catalyst for treating ammonia leakage from a selective catalytic reduction device and a preparation method thereof. Background technique [0002] Selective catalytic reduction (SCR) technology is currently an effective method to reduce the emission level of nitrogen oxides (NOx) from diesel engines. X At the same time, it can improve the thermal efficiency of diesel engines, so it has become one of the exhaust gas treatment technologies that are widely used and can meet Euro V and Euro VI emission regulations. The principle of diesel engine SCR technology is: according to the exhaust conditions of the diesel engine, a specific amount of urea solution is sprayed into the exhaust pipe of the diesel engine; the urea solution is thermally decomposed and hydrolyzed under the action of the high-temperature exhaust of the diesel engine, and finally gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/46B01J35/04B01J37/02B01D53/94B01D53/56B01D53/58F01N3/20F01N3/28
CPCB01J29/48B01J29/46B01J37/0244B01D53/9413B01D53/9436F01N3/2066F01N3/2807B01J2229/186B01J2229/20B01J2229/40B01J35/56
Inventor 李博刘顺涛杨鹤陶志平卢文彤邢建强胡晓明
Owner CHINA PETROLEUM & CHEM CORP
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