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DOC oxidation catalyst for diesel engine exhaust gas discharging and preparation method

A technology of tail gas emission and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc., can solve the problem of catalyst resistance to sulfur poisoning, etc., and achieve improved sulfur resistance and good aging resistance. , the effect of high complete conversion efficiency

Inactive Publication Date: 2017-03-15
NANJING IKAKAT EMISSIONS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to improve the low-temperature light-off temperature of the diesel oxidation DOC catalyst, improve the HC conversion efficiency at idle speed or low temperature, and solve the problem of sulfur poisoning resistance and durability of the catalyst; the invention provides a DOC oxidation catalyst for diesel engine exhaust emission and its preparation method

Method used

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  • DOC oxidation catalyst for diesel engine exhaust gas discharging and preparation method
  • DOC oxidation catalyst for diesel engine exhaust gas discharging and preparation method
  • DOC oxidation catalyst for diesel engine exhaust gas discharging and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: making precious metal content 5g / ft3; uploading capacity 90g / l; DOC slurry; coating carrier diameter*height*wall thickness*mesh: 80*90*4*400; volume: 0.45216L, baked Dry calcined catalyst carrier;

[0050] 1) Make slurry

[0051] According to the calculation, it can be known that coating a carrier requires precious metal pt: 0.07983953g / piece; the dry weight of the coating is 40.6944g / piece.

[0052] Taking the production of 10 catalyst coatings as an example, the powder to be coated has a dry weight of 406.944g, wherein the mass percentage of precious metal is 0.392%, and the mass fraction of alumina or silicon-modified alumina is 45%, and cerium-zirconium powder or 35% pure cerium oxide, 15% β molecular sieve, 4.6% additives (ie adhesive)

[0053] That is, the accurate weighing concentration is 7.052962g of 11.32% platinum nitrate solution, the quality of alumina or silicon-modified alumina is 183.1g, cerium-zirconium powder or pure cerium oxide 142.4g, a...

Embodiment 2

[0059] Embodiment 2: making precious metal content is that 10g / ft The loading capacity is 100g / l DOC slurry

[0060] Diameter*height*wall thickness*mesh 80*90*4*400

[0061] Volume 0.45216L, pt: 0.15967906g / piece, coating dry weight: 45.216g / piece

[0062] 1) Preparation of slurry: Take the preparation of 10 catalyst coatings as an example, after calculation, the dry weight of the coating is 452.2g.

[0063] Among them, the mass percentage of precious metal is 0.353%, wherein the mass fraction of alumina or silicon-modified alumina is 45%, cerium-zirconium powder or pure cerium oxide is 35%, β molecular sieve is 15%, and additives are 4.6%.

[0064] That is, the accurately weighed concentration is 14.106g of 11.32% platinum nitrate solution

[0065] Weigh the quality of alumina: 203.49g

[0066] The mass of cerium zirconium powder is: 158.27g

[0067] β molecular sieve mass: 67.83g

[0068] Additives: 20.8g

[0069] Prepare a solid content of 40% raw pulp (slurry without...

Embodiment 3

[0076] Embodiment 3: making noble metal content is that 60g / ft The loading capacity is 120g / l DOC slurry

[0077] Diameter*height*wall thickness*mesh number: 80*90*4*400;

[0078] Volume 0.452L, pt: 0.958g / piece, coating dry weight 54.259 / piece

[0079] 1) Make slurry

[0080] Taking the production of 10 catalyst coatings as an example, the dry weight of the coating to be coated is 542.6g, wherein the mass percentage of precious metal is 1.766%, the mass fraction of alumina or silicon-modified alumina is 45%, cerium zirconium powder or Pure cerium oxide 35%, β molecular sieve 15%, additive 3.2%.

[0081] That is, the accurately weighed concentration is 84.629g of 11.32% platinum nitrate solution

[0082] Weigh the quality of alumina: 24.17g

[0083] The mass of cerium zirconium powder is: 189.91g

[0084] Beta molecular sieve mass: 81.39g

[0085] Additives: 17.36g

[0086] Prepare a solid content of 40% raw pulp (slurry without precious metals). Considering that the ra...

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Abstract

The invention discloses a DOC oxidation catalyst for diesel engine exhaust gas discharging. The DOC oxidation catalyst comprises aluminum oxide or silicon modified aluminum oxide with a large specific surface area, cerium zirconium oxide or ceric oxide with a large specific surface area, a sulfur poisoning resistance material and a material with an adsorption effect on HC. The invention further discloses a preparation method of the DOC oxidation catalyst for diesel engine exhaust gas discharging. The preparation method comprises the following steps: 1, preparing slurry; 2, adding a noble metal solution; 3, coating a carrier; 4, drying and calcining the carrier. According to the preparation method provided by the invention, the adsorption performance of the catalyst for HC at low temperature is improved, and the conversion efficiency of HC at low temperature is improved; the catalyst is high in sulfur poisoning resistance and excellent in high-temperature aging resistance, and can effectively reduce the discharging volume of CO and HC.

Description

technical field [0001] The invention belongs to the field of automobile tail gas treatment, and in particular relates to a DOC oxidation catalyst for diesel engine tail gas emission and a preparation method. Background technique [0002] The diesel engine has the characteristics of high power and good economic performance. Compared with gasoline engines, diesel engines have higher combustion efficiency, so the development prospects of diesel engines are huge. But relatively speaking, the NOx, THC, CO and particulate matter emissions of diesel engines are higher than those of gasoline engines. [0003] The exhaust temperature of diesel engine exhaust is low (generally 150-400°C), especially at the start-up stage, the exhaust temperature can be reduced to about 100°C; the sulfur content in diesel engine exhaust is relatively high; therefore, it has low-temperature catalytic activity and sulfur resistance of noble metal DOC catalysts put forward higher requirements; [0004]...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01D53/86B01D53/56B01D53/72
CPCB01J23/002B01D53/8628B01D53/8668B01D2258/012B01J23/63B01J2523/00B01J2523/31B01J2523/3712B01J2523/48B01J2523/828
Inventor 孔庆梅舒慧敏高俊张秀
Owner NANJING IKAKAT EMISSIONS TECH CO LTD
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