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Preparation method of DOC (diesel oxidation catalyst) for exhaust gas emission of diesel engine

A type of exhaust emission and oxidation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc.

Inactive Publication Date: 2018-05-04
NANJING IKAKAT EMISSIONS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is the deficiency of the prior art in unit service, and a preparation method of DOC oxidation catalyst for diesel engine exhaust emission is provided, so that the DOC catalyst coating has a lower light-off temperature, even in the process where the exhaust gas temperature is not high It can also light up quickly under certain conditions; it can achieve high conversion efficiency of HC and CO; it can greatly increase the exhaust temperature, improve its own oxidation and the performance of DPF regeneration, so as to effectively convert NO in the exhaust gas into NO2, Conducive to regeneration of dry soot in DPF

Method used

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  • Preparation method of DOC (diesel oxidation catalyst) for exhaust gas emission of diesel engine
  • Preparation method of DOC (diesel oxidation catalyst) for exhaust gas emission of diesel engine
  • Preparation method of DOC (diesel oxidation catalyst) for exhaust gas emission of diesel engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] Prepare two kinds of slurries with precious metal content of 60g / ft3Pt:Pd:Rh=2:1:0, coating loads of 80g / L and 120g / L respectively, and the specification of coating carrier is diameter*height / mesh / wall Thick 80mm*90mm / 400cpsi / 4mil ceramic cordierite carrier, the specific implementation is as follows:

[0028] 1. Preparation of raw slurry: Weigh 120 grams of modified alumina, 80 grams of modified cerium-zirconium oxide, weigh 326.3 grams of deionized water, prepare a slurry with a solid content of 38%, put it into a ball mill for ball milling, and ball mill After a period of time, the particle size D50 of the slurry is tested to be between 3-5 μm. Take out a dry weight of 97.93 grams of slurry. A wet weight of 257.7 grams of slurry is fully stirred.

[0029] 2. Preparation of slurry: weigh 15.56 grams of a salt solution with a solid content of 11.35% platinum, i.e. 1.766 grams of pure platinum; weigh 7.062 grams of a salt solution with a solid content of 12.5% ​​palladi...

specific Embodiment approach 2

[0033] Prepare two slurries with precious metal content of 40g / ft3Pt:Pd:Rh=2; 1:0, coating loadings of 80g / L and 120g / L respectively, and coating carrier specifications are diameter*height / mesh / wall Thick 80mm*90mm / 400cpsi / 4mil ceramic cordierite carrier, the specific implementation is as follows:

[0034]1. Preparation of raw slurry: Weigh 120 grams of modified alumina, 80 grams of modified cerium-zirconium oxide, and 326.315 grams of deionized water to prepare a slurry with a solid content of 38%, and put it into a ball mill for ball milling. After a period of time, the particle size D50 of the slurry is tested to be between 3-5 μm. Take out the slurry and stir thoroughly.

[0035] 2. First prepare a slurry with a precious metal content of 40g / ft3Pt:Pd:Rh=2:1:0, and a loading capacity of 80g / L on the coating, and accurately weigh the spare raw slurry with a wet weight of 258.5 grams, that is, a dry weight of 98.235 Gram puree for later use.

[0036] Accurately weigh 10.37...

specific Embodiment approach 3

[0038] Prepare two kinds of slurries with precious metal content of 70g / ft3Pt:Pd:Rh=2:1:0, coating loads of 80g / L and 120g / L respectively, coating carrier specifications are diameter*height / mesh / wall Thick 80mm*90mm / 400cpsi / 4mil ceramic cordierite carrier, the specific implementation is as follows:

[0039] 1. Preparation of raw slurry: Weigh 120 grams of modified alumina, 80 grams of modified cerium-zirconium oxide, and 326.315 grams of deionized water to prepare a slurry with a solid content of 38%, and put it into a ball mill for ball milling. After a period of time, the particle size D50 of the slurry is tested to be between 3-5 μm. Take out the slurry and stir thoroughly.

[0040] 2. Prepare a slurry with a precious metal content of 70g / ft3Pt:Pd:Rh=2:1:0, and a loading capacity of 80g / L on the coating, and accurately weigh the spare raw slurry with a wet weight of 255.03 grams, that is, a dry weight of 96.913 1 gram of the original slurry for subsequent use; accurately ...

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Abstract

The invention discloses a preparation method of a DOC (diesel oxidation catalyst) for the exhaust gas emission of a diesel engine. The preparation method comprises the following steps: (a) weighing modified aluminum oxide, modified cerium-zirconium oxide and deionized water, carrying out ball milling for a period of time, and testing the particle size of slurry D50 which is 3-5 microns; (b) slowlydropwise adding a noble metal salt solution into the slurry so as to maintain the pH value of the slurry to be 9-10; (c) carrying out carrier coating; and (d) calcining. According to the preparationmethod, a DOC coating layer has a relatively low ignitiontemperature and can be rapidly ignited even when the exhaust gas temperature is not high; very high conversion efficiencies of HC and CO can beachieved; the exhaust gas temperature can be greatly increased, and the oxidation performance and the DPF regeneration performance can be improved; and NO in exhaust gas can be effectively convertedinto NO2, so that the regeneration of dry soot in DPF is promoted.

Description

technical field [0001] The invention relates to the technical field of automobile tail gas treatment, in particular to a method for preparing a DOC oxidation catalyst for diesel engine tail gas emission. Background technique [0002] In recent years, the development momentum of diesel vehicles is very rapid. Compared with gasoline vehicles, diesel vehicles have many advantages such as superior environmental performance, good power performance and less fuel consumption. Therefore, compared with gasoline vehicles, diesel vehicles have better economy, and are more and more concerned and favored by everyone. At the same time, diesel vehicle exhaust emission standards are becoming increasingly stringent, which also puts forward higher requirements for diesel vehicle exhaust after-treatment technology. Among them, the diesel vehicle oxidation catalyst (DOC,) is an indispensable part of the diesel vehicle exhaust gas treatment system. DOC catalyst can oxidize CO, HC, NO and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01D53/945B01J23/002B01J23/63B01D2258/01B01J2523/00B01J2523/31B01J2523/3712B01J2523/48Y02A50/20
Inventor 孔庆梅何俊俊舒慧敏
Owner NANJING IKAKAT EMISSIONS TECH CO LTD
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