Preparation method of oxidation catalyst used for diesel vehicle

A catalyst and oxidation-type technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of the limitation of the amount of precious metals, and achieve good resistance to sulfur toxicity, Reduces PM emissions and has good thermal stability

Inactive Publication Date: 2018-11-23
DONGUANN INNOVATIVE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the tightening of national emission regulations, the requirements for the catalytic performance of oxidation catalysts are getting higher and higher, such as low-temperature ignition activity, service life, thermal stability, etc. In addition, due to the shortage of precious metal resources, the amount of precious metals is limited. , the industry is also looking for rare earth metal catalysts to replace precious metals

Method used

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  • Preparation method of oxidation catalyst used for diesel vehicle
  • Preparation method of oxidation catalyst used for diesel vehicle
  • Preparation method of oxidation catalyst used for diesel vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The present embodiment provides a kind of preparation method for the oxidation catalyst of diesel vehicle, comprises the following steps:

[0038] 1) Dissolve cerium nitrate, manganese nitrate, and samarium nitrate in a solution containing surfactant according to a certain molar mass ratio, then add precipitant tetramethylammonium hydroxide to adjust the pH to 9-12, the reaction is complete, and place for aging for 5 hours , After centrifugation and washing to obtain a precipitate, the obtained precipitate was baked at 120°C for 12h, then calcined in a muffle furnace at 500°C for 10h, ground and crushed, and then calcined at 800°C for 10h to obtain CeO containing a fluorite phase. 2 , mullite phase SmMn2 o 5 , spinel phase Mn 3 o 4 Mixed-phase catalyst; then add the mixed-phase catalyst and aluminum sol to deionized water and 50% absolute ethanol, stir for 1-3h until the slurry is uniform, and then grind the slurry with a sand mill until the particle size d50 of the s...

Embodiment 2

[0045] This embodiment has the following differences from Embodiment 1:

[0046] ①What prepared in step 2) is the Al loaded with 1.2%Pt and 0.8%Pd 2 o 3 , Al loaded with 1.2% Pt and 0.8% Pd 2 o 3 and Al without precious metals 2 o 3 The mass ratio is 1:1;

[0047] ② What is prepared in step 3) is Al loaded with 1% Pd 2 o 3 , Al loaded with 1% Pd 2 o 3 and Al without precious metals 2 o 3 The mass ratio is 2:3;

[0048] ③The weight gain of the bottom layer of the coated carrier is 105g / L, and the mixed-phase catalyst is 1.2g / in 3 , alumina 0.5g / in 3 , precious metal 8.25g / ft 3 ;Surface weight gain 40g / L, molecular sieve 0.35g / in 3 , precious metal 2.75g / ft 3 , alumina 0.25g / in 3 .

[0049] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0051] This embodiment has the following differences from Embodiment 1:

[0052] 1. What is prepared in step 2) is the Al loaded with 0.6% Pt and 0.4% Pd 2 o 3 , Al loaded with 0.6% Pt and 0.4% Pd 2 o 3 and Al without precious metals 2 o 3 The mass ratio is 1:1;

[0053] ② What is prepared in step 3) is Al loaded with 1% Pd 2 o 3 , Al loaded with 1% Pd 2 o 3 and Al without precious metals 2 o 3 The mass ratio is 1:4;

[0054] ③The weight gain of the bottom layer of the coated carrier is 105g / L, and the mixed-phase catalyst is 1.2g / in 3 , alumina 0.5g / in 3 , precious metal 4.125g / ft 3 ;Surface weight gain 40g / L, molecular sieve 0.35g / in 3 , precious metal 1.375g / ft 3 , alumina 0.25g / in 3 .

[0055] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a preparation method of an oxidation catalyst used for a diesel vehicle. The method comprises the following stepsof (1) preparing mixed-phase catalyst slurry A; (2) preparing precious metal-containing slurry B; (3) preparing precious metal-containing slurry C; (4) preparing molecular sieve-containing slurry D;(5) preparing bottom layer coating slurry and surface layer coating slurry; (6) coating a carrier with the bottom layer coating slurry and the surface layer coating slurry in sequence. Compared with the prior art, the preparation method of the oxidation catalyst used for the diesel vehicle adopts a novel coating technology and a small amount of precious metals, and a prepared oxidation catalyst coating is even in distribution, good in thermal stability and low in initiation temperature, and has very good capability of oxidizing NO in diesel vehicle tail gas and SOF in particles.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of an oxidation catalyst used for diesel vehicles. Background technique [0002] With the rapid development of the economy, diesel vehicles are increasing dramatically. Diesel vehicles emit a large amount of exhaust pollutants, such as carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO X ) and particles (PM) will seriously endanger human health and the ecological environment. At present, the basic principle of controlling pollutant emissions from diesel vehicles is to install after-treatment devices to purify the exhaust gas. Diesel catalytic converter technology (DOC) is the first product to be used. Its structure is basically the same as that of the three-way catalytic converter, but the catalyst coating is different. It only has oxidation ability and no reduction ability. Oxidation catalysts for automotive diesel engines are base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01D53/86B01D53/62B01D53/56B01D53/72
CPCB01D53/8628B01D53/864B01D53/8668B01J23/002B01J23/6562B01J2523/00B01J2523/31B01J2523/3737B01J2523/3712B01J2523/72B01J2523/824B01J2523/828
Inventor 熊卡刘称发吴宝松张灿
Owner DONGUANN INNOVATIVE NEW MATERIALS
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