Heat-resistant modified mesoporous molecular sieve-based nitrogen oxide trapping catalyst as well as preparation method and application thereof

A technology for nitrogen oxides and catalysts, which is applied in the field of lean-burned nitrogen oxides trapping catalysts and their preparation, can solve problems such as poor heat resistance, and achieve the effects of improving thermal sintering resistance, improving thermal stability and reducing raw material costs.

Active Publication Date: 2022-07-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SBA-15 type molecular sieve is a kind of mesoporous molecular sieve material widely used at present. Its pore diameter is between 5 and 30nm, which is suitable for containing metal species such as Pd, but its heat resistance is relatively poor, and it must pass through special metal elements. Modification can improve the high temperature stability of the SBA-15 molecular sieve framework structure, so that this type of material can be used in the field of LNT catalyst research and development

Method used

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  • Heat-resistant modified mesoporous molecular sieve-based nitrogen oxide trapping catalyst as well as preparation method and application thereof
  • Heat-resistant modified mesoporous molecular sieve-based nitrogen oxide trapping catalyst as well as preparation method and application thereof
  • Heat-resistant modified mesoporous molecular sieve-based nitrogen oxide trapping catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Catalyst composition design

[0037] The following ratios are designed respectively: the mass percentages of Pd, Y and SBA-15 molecular sieve in the Pd-Y binary metal modified SBA-15 molecular sieve are: 15% / 15% / 70%, MgO, SrO and ZrO 2 The mass percentage is: 10% / 20% / 70%, γ-Al 2 O 3 and SiO 2 The mass percentage is: 80% / 20%, the mass percentage of the main catalytic active components, adsorbents, co-catalysts and coating additives is: 0.5% / 15% / 10% / 74.5%, and the planned configuration coating The slurry can generate 2000g of catalytic coating.

[0038] (2) Preparation of modified molecular sieves

[0039] Weigh 5.9g Y (NO 3 ) 3 ·4H 2 O and put it into 0.11L deionized water, and stir to prepare a solution; add 7g of SBA-15 molecular sieve to the solution, stir vigorously at 80°C for 8h, and then evaporate the water to dryness at 90°C. The dried solids were dried at 100 °C for 8 h, the dried solids were calcined at 550 °C for 1 h in an air atmosphere, and then ...

Embodiment 2

[0046] (1) Catalyst composition design

[0047] The following ratios were designed respectively: the mass percentages of Pd, Y and SBA-15 molecular sieve in the Pd-Y binary metal modified SBA-15 molecular sieve are: 1% / 10% / 89%, MgO, SrO and ZrO 2 The mass percentage is: 25% / 40% / 35%, γ-Al 2 O 3 and SiO 2 The mass percentage is: 70% / 30%, the mass percentage of the main catalytic active components, adsorbents, co-catalysts and coating additives is: 5% / 25% / 15% / 55%, and the planned configuration coating The slurry can generate 2000g of catalytic coating.

[0048] (2) Preparation of modified molecular sieves

[0049] Weigh 39.0g Y (NO 3 ) 3 ·4H 2 O and put it into 0.4L deionized water, and stir to prepare a solution; add 89g of SBA-15 molecular sieves to the solution, stir vigorously at 50°C for 16h, and then evaporate the water to dryness at 70°C. The dried solids were dried at 80°C for 16h, the dried solids were calcined at 550°C under air atmosphere for 1h, and then calci...

Embodiment 3

[0056] (1) Catalyst composition design

[0057] The following ratios are designed respectively: the mass percentages of Pd, Y and SBA-15 molecular sieves in the Pd-Y binary metal modified SBA-15 molecular sieve are: 10% / 10% / 80%, MgO, SrO and ZrO 2 The mass percentage is: 20% / 30% / 50%, γ-Al 2 O 3 and SiO 2The mass percentage is: 75% / 25%, the mass percentage of the main catalytic active components, adsorbents, co-catalysts and coating additives is: 5% / 20% / 10% / 65%, and the planned configuration coating The slurry can generate 2000g of catalytic coating.

[0058] (2) Preparation of modified molecular sieves

[0059] Weigh 39.0g Y (NO 3 ) 3 ·4H 2 O and put it into 0.2L deionized water, and stir to prepare a solution; add 80g SBA-15 molecular sieves to the solution, stir vigorously at 80°C for 8h, and then evaporate the water to dryness at 90°C. The dried solids were dried at 90°C for 12h, the dried solids were calcined at 500°C in an air atmosphere for 2h, and then calcined ...

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Abstract

The invention discloses a heat-resistant modified mesoporous molecular sieve-based nitrogen oxide trapping catalyst, which is prepared from a Pd-Y binary metal modified SBA-15 type molecular sieve, BaO, MgO, SrO, ZrO2, gamma-Al2O3, SiO2 and 400-mesh cordierite honeycomb ceramic, and the Pd-Y binary metal modified SBA-15 type molecular sieve forms a main catalytic active component. The Pd-Y binary metal modified SBA-15 type molecular sieve is used for replacing precious metal Pt in an early LNT catalyst to serve as a main catalytic active component, the dosage of the precious metal is reduced, and the raw material cost is reduced. The Y element is used for modifying the SBA-15 type molecular sieve, so that the thermal stability of a framework structure of the SBA-15 type molecular sieve is improved; the SBA-15 type mesoporous molecular sieve is used for replacing a ZSM-5 type microporous molecular sieve, active metal species can be bound in holes in the surface of the molecular sieve, and the heat-resistant sintering performance of the main catalytic active component is further improved.

Description

technical field [0001] The invention belongs to the technology for purifying exhaust pollutants of internal combustion engines for vehicles, and in particular relates to a lean-burn nitrogen oxide trap (LNT) catalyst for purifying nitrogen oxides (NOx) in diesel engine exhaust gas and a preparation method thereof. Background technique [0002] NOx is a general term for a series of toxic and harmful nitrogen oxide gases, which not only directly endanger the health of organisms, but also induce environmental disasters such as photochemical smog and the greenhouse effect. After years of treatment, the contribution rate of fixed sources such as factories, power plants, and boilers to NOx pollutants in the atmosphere has dropped sharply. Motor vehicles, especially diesel vehicles, have become the main source of NOx emissions in my country's atmosphere. In order to improve environmental quality and protect citizens' health, most countries in the world have formulated strict emissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03F01N3/28
CPCB01J29/0308F01N3/28B01J2229/18B01J2229/20
Inventor 宋崇林吕誉王晨晰李振国刘双喜吕刚
Owner TIANJIN UNIV
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