Metal-modified molecular sieve-based diesel oxidation catalyst and preparation and use methods thereof

An oxidation catalyst, molecular sieve-based technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, molecular sieve catalyst, chemical instruments and methods, etc., can solve the problem of increasing the maintenance of the whole machine, maintenance costs, and damage to the reliability of the DPF carrier And life, additional fuel consumption and other issues

Active Publication Date: 2020-10-30
HEFEI SHENZHOU CATALSIS PURIFIER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the active regeneration process not only takes up the normal running time of the diesel engine, increases the maintenance and maintenance costs of the whole machine, and generates additional fuel consumption, but also frequent high-temperature regeneration seriously damages the reliability and life of the DPF carrier

Method used

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  • Metal-modified molecular sieve-based diesel oxidation catalyst and preparation and use methods thereof
  • Metal-modified molecular sieve-based diesel oxidation catalyst and preparation and use methods thereof
  • Metal-modified molecular sieve-based diesel oxidation catalyst and preparation and use methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing a catalyst for a metal-modified molecular sieve-based diesel engine oxidation catalyst, comprising the following steps:

[0032] (1) Catalyst composition design

[0033] The components with the following mass fractions were designed respectively: V / Mo / K ternary metal modified ZSM-5 molecular sieve and Ag 2 The mass fractions of O are 80%, 20%, respectively, V 2 o 5 、MoO 3 、K 2 The mass fractions of O and ZSM-5 molecular sieves are 5%, 10%, 5%, 80%, respectively, CeO 2 and ZrO 2 The mass fractions are 60%, 40%, respectively, γ-Al 2 o 3 and SiO 2 The mass fraction of the main catalytic active component, the co-catalyst and the coating base material are respectively 30%, 20%, and 50%. The target of the catalytic coating and the carrier The mass percentage ranges are: 22-24%, 76-78%, the sum of the mass fractions of the catalytic coating and the carrier is 100%, and a coating slurry capable of forming 2000g of the catalytic coating is prepare...

Embodiment 2

[0041] A method for preparing a catalyst for a metal-modified molecular sieve-based diesel engine oxidation catalyst, comprising the following steps:

[0042] (1) Catalyst composition design

[0043]The components with the following mass fractions were designed respectively: V / Mo / K ternary metal modified ZSM-5 molecular sieve and Ag 2 The mass fractions of O are 80%, 20%, respectively, V 2 o 5 、MoO 3 、K 2 The mass fractions of O and ZSM-5 molecular sieves are 10%, 20%, 10%, 60%, respectively, CeO 2 and ZrO 2 The mass fractions are 80%, 20%, respectively, γ-Al 2 o 3 and SiO 2 The mass fraction of the main catalytic active component, the co-catalyst and the coating base material are respectively 20%, 10%, and 70%. The target of the catalytic coating and the carrier The mass percentage ranges are: 28-30%, 72-70%, the sum of the mass percentages is 100%, and the planned configuration of the coating slurry can produce 2000g of the catalytic coating.

[0044] (2) Preparati...

Embodiment 3

[0051] A method for preparing a catalyst for a metal-modified molecular sieve-based diesel engine oxidation catalyst, comprising the following steps:

[0052] (1) Catalyst composition design

[0053] The components with the following mass fractions were designed respectively: V / Mo / K ternary metal modified ZSM-5 molecular sieve and Ag 2 The mass fractions of O are 70%, 30%, and V 2 o 5 、MoO 3 、K 2 The mass fractions of O and ZSM-5 molecular sieves are 10%, 10%, 10%, 70%, respectively, CeO 2 and ZrO 2 The mass fractions are 75%, 25%, respectively, γ-Al 2 o 3 and SiO 2 The mass fractions of the catalyst coating and the carrier are respectively 85%, 15%, and the mass fractions of the main catalytic active component, the cocatalyst, and the coating base material are 30%, 10%, and 60%, respectively, and the target of the catalytic coating and the carrier is The mass percentage ranges are: 23-25%, 77-75%, the sum of the mass percentages is 100%, and the planned configuration...

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Abstract

The invention discloses a metal-modified molecular sieve-based diesel oxidation catalyst which is prepared by taking a V / Mo / K ternary metal modified ZSM-5 type molecular sieve and Ag2O as main catalytic active components, CeO2 and ZrO2 as cocatalysts, and gamma-Al2O3 and SiO2 as coating base materials. The catalyst is coated in DOC, and PM, HC and CO in diesel engine exhaust can be efficiently purified. The main catalytic active component composed of a ternary metal modified molecular sieve and Ag2O is used for replacing precious metal in a traditional DOC catalyst, the raw material cost of the DOC catalyst is reduced, the sulfur resistance and thermal stability of the DOC catalyst are improved, and the purification performance of the novel DOC catalyst on carbonaceous components in PM isenhanced. The application of the ternary metal modified molecular sieve reduces the particle size of catalyst particles, increases the surface catalytic active sites of the catalyst per unit mass, andreduces the use amount of metal oxides.

Description

technical field [0001] The invention belongs to the purification technology of diesel exhaust pollutants, and in particular relates to a catalyst used for a diesel oxidation catalyst (DOC) and having good exhaust particulate matter (PM) purification performance and a preparation method thereof. Background technique [0002] The PM emissions of diesel engines have extremely stringent control requirements, and diesel particulate filter (DPF) is an essential exhaust after-treatment device. However, when the amount of PM deposited in the DPF is large, it will cause the exhaust gas to be overpressurized and cause the combustion in the cylinder of the diesel engine to deteriorate. Therefore, the DPF must be "actively regenerated" frequently during use, that is, through methods such as fuel cylinder or exhaust pipe post-injection, the exhaust temperature of the diesel engine is increased to oxidize the deposited PM in the DPF. However, the active regeneration process not only take...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J37/02B01J37/00B01J37/08B01D53/94B01D53/72B01D53/56
CPCB01D53/944B01J23/002B01J23/66B01J29/48B01J37/0036B01J37/0234B01J37/024B01J37/088B01J2229/18B01J2523/00B01J2523/18B01J2523/31B01J2523/3712B01J2523/41B01J2523/48
Inventor 胡朝稳
Owner HEFEI SHENZHOU CATALSIS PURIFIER CO LTD
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