CN104500186B - A kind of exhaust gas purifying silencing device for motor vehicle - Google Patents
A kind of exhaust gas purifying silencing device for motor vehicle Download PDFInfo
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- CN104500186B CN104500186B CN201510011133.3A CN201510011133A CN104500186B CN 104500186 B CN104500186 B CN 104500186B CN 201510011133 A CN201510011133 A CN 201510011133A CN 104500186 B CN104500186 B CN 104500186B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of exhaust gas purifying silencing device for motor vehicle, exhaust gas purifying silencing device for motor vehicle includes cylindrical housings, one end of housing is the air inlet that is connected with enmgine exhaust, one end of housing is gas outlet, in housing, front portion near air inlet is provided with catalyst chamber, in catalyst chamber, layering is filled with the catalyst of active component gradient distribution, gas flow channel is left between every layer of catalyst, the gas vent at catalyst chamber rear portion connects " U " type hush tube continuously, and hush tube tube wall has sound attenuation hole.Present invention employs the active metal maceration extract of stepwise gradient formula dipping variable concentrations, mode that active metal component is incremented by gradient is distributed to make integral catalyzer pass through, reduce the consumption of active metal component in catalyst, catalysis activity, selectivity and the conversion ratio of existing catalyst in even better than prior art can be reached simultaneously.Catalyst layering in catalyst chamber is placed, and leaves the passage of gas circulation, improves the catalytic efficiency of tail gas.
Description
Technical field
The present invention relates to a kind of exhaust gas purifying silencing device for motor vehicle, belong to field of Environment Protection.
Background technology
China's automobile pollution is more than 100,000,000, national economy is served huge progradation, provide convenience to the life of people, but the emission of the harmful substance in vehicle exhaust such as carbon monoxide, unburned hydrocarbon, nitrogen oxides and particulate etc. cause more ill effect to environment, need to realize vehicle exhaust zero pollutant discharge by advanced technological means.
Generally requiring to include tai-gas clean-up catalyst: high activity, exhaust emissions amount is big, and catalytic converter installing space is limited, and determining cleaning catalyst must use under high-speed, but uses catalyst must possess at a relatively high activity under high-speed；Good selectivity, can convert harmful substance in tail gas；Good heat endurance, normally can use under the hot conditions of tail gas.In traditional tai-gas clean-up catalyst, active metal is uniformly distributed in the carrier, owing to during exhaust emissions, nitrogen oxides is constantly converting with the concentration being emitted in integral catalyzer of tail gas, therefore, in traditional catalyst, active component can not reach to make full use of, and load capacity is big, purify cost high.
The additionally main cities noise source of the influence of noise people's work and study life during work of precession car engine.
Summary of the invention
Present invention aims in prior art utilizing of active component in integral catalyzer insufficient, and the problem that preparation cost is high, thering is provided one to produce, raw this is the lowest, and has good catalytic activity, selectivity and conversion ratio, has the tail-gas purifying silencer of noise elimination function concurrently.
For achieving the above object, the present invention adopts the following technical scheme that realization:
A kind of exhaust gas purifying silencing device for motor vehicle, exhaust gas purifying silencing device for motor vehicle includes cylindrical housings, one end of housing is the air inlet that is connected with enmgine exhaust, one end of housing is gas outlet, in housing, front portion near air inlet is provided with catalyst chamber, in catalyst chamber, layering is filled with the catalyst of active component gradient distribution, gas flow channel is left between every layer of catalyst, the gas vent at catalyst chamber rear portion connects " U " type hush tube continuously, having sound attenuation hole on hush tube tube wall, the afterbody of " U " type hush tube is connected with gas outlet continuously；
The preparation process of the catalyst of active component gradient distribution is as follows:
1) compound concentration is the palladium nitrate solution of 10g/L, 8g/L, 5g/L and 3g/L respectively, standby；
2) load weighted cerous nitrate and zirconium nitrate are added in deionized water, stirring is mixed to get mixed solution, wherein in terms of cerium oxide and zirconium oxide, cerium is 1:1 with the mol ratio of zirconium, adds 2ml and analyzes straight alcohol solution, add 1g polyethylene glycol after dispersed with stirring in this solution, mixed solution is placed in 70 DEG C of water-baths heating, stirring 30 minutes, obtain mixed solution, the volume of this mixed solution is 1.5 times of cordierite honeycomb ceramic carrier volume to be impregnated；
3) take a size of 50mm × 25mm × 30mm cordierite honeycomb ceramic as carrier, this carrier be placed in step 2) mixed solution in, be sufficiently impregnated with 30 minutes, take out and be placed in baking oven 180 DEG C and be dried 2 hours；
4) dried for step 3) carrier is placed in Muffle furnace about 500 DEG C of-550 DEG C of roastings 2 hours, naturally cools to room temperature, it is thus achieved that there is the catalyst carrier of cerium zirconium coating；
5) take the palladium nitrate solution that concentration is 3g/L of step 1) preparation, the carrier of step 4) is completely immersed in this solution, impregnates 30 minutes, take out and be placed on 120 DEG C dry 2 hours in baking oven；
6) take the palladium nitrate solution that concentration is 5g/L of step 1) preparation, dried for step 5) semi-finished product are inserted this solution along its length, make the carrier of 3/4 length immerse in solution, impregnate 30 minutes, take out and be placed on 120 DEG C dry 2 hours in baking oven；
7) palladium nitrate solution that concentration is 8g/L of step 1) preparation is taken, the semi-finished product that step 6) obtains insert this solution along its length, and insertion one end is identical with step 6), and makes the carrier of 1/2 length immerse in solution, impregnate 30 minutes, take out and be placed on 120 DEG C dry 2 hours in baking oven；
8) palladium nitrate solution that concentration is 10g/L of step 1) preparation is taken, the semi-finished product that step 7) obtains are inserted this solution along its length, insert one end identical with step 7), and make the carrier of 1/4 length immerse in solution, impregnate 30 minutes, taking-up is placed in baking oven 120 DEG C and is dried 2 hours, dried product is then placed in Muffle furnace 800 DEG C of roastings 3 hours, it is thus achieved that catalyst prod.
The volume of catalyst chamber is the 1/3-1/2 of housing volume.
The caliber of hush tube is the 1/3-2/3 of cylindrical housings internal diameter.
In catalyst prod, the gross mass of active component Pd accounts for the 0.2wt% of cordierite honeycomb ceramic carrier weight.
Beneficial effects of the present invention:
Present invention employs the active metal maceration extract of stepwise gradient formula dipping variable concentrations, mode that active metal component is incremented by gradient is distributed to make integral catalyzer pass through, the integral catalyzer prepared by above-mentioned preparation method, not only reduce the consumption of active metal component in catalyst, catalysis activity, selectivity and the conversion ratio of existing catalyst in even better than prior art can be reached simultaneously.Simultaneously by the effect of hush tube, sound is removed, it is achieved that realize while tail gas clean-up noise reduction.Catalyst layering in catalyst chamber is placed, and leaves the passage of gas circulation, improves the catalytic efficiency of tail gas.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of exhaust gas purifying silencing device for motor vehicle.
1-housing, 2-air inlet, 3-gas outlet, 4-catalyst chamber, 5-catalyst, 6-" U " type hush tube continuously.
Detailed description of the invention
A kind of exhaust gas purifying silencing device for motor vehicle, exhaust gas purifying silencing device for motor vehicle include cylindrical housings 1, one end of housing 1 be the air inlet 2 that is connected with enmgine exhaust, one end of housing be gas outlet 3, in housing, front portion near air inlet is provided with catalyst chamber 4, in catalyst chamber 4, layering is filled with the catalyst 5 of active component gradient distribution, gas flow channel is left between every layer of catalyst, the gas vent at catalyst chamber rear portion connects " U " type hush tube 6 continuously, having sound attenuation hole on hush tube tube wall, the afterbody of " U " type hush tube is connected with gas outlet 3 continuously.
Embodiment
1
With deionized water as solvent, compound concentration is the palladium nitrate solution of 10g/L, 8g/L, 5g/L and 3g/L respectively, standby.
Adding in deionized water by load weighted cerous nitrate and zirconium nitrate, stirring is mixed to get mixed solution, wherein with CeO2And ZrO2Meter, cerium is 1:1 with the mol ratio of zirconium, in this solution, add 2ml analyze straight alcohol solution, 1g polyethylene glycol is added after dispersed with stirring, mixed solution is placed in 70 DEG C of water-baths heating, stirring 30 minutes, obtain mixed solution, the volume of this mixed solution is 1.5 times of cordierite honeycomb ceramic carrier volume to be impregnated.
Take a size of 50mm × 25mm × 30mm cordierite honeycomb ceramic as carrier, this carrier is placed in above-mentioned mixed solution, is sufficiently impregnated with 30 minutes, take out and be placed in baking oven 180 DEG C and be dried 2 hours.
Dried for previous step carrier is placed in Muffle furnace 500 DEG C of roastings 2 hours, naturally cools to room temperature, it is thus achieved that there is the catalyst carrier of cerium zirconium coating.
Take the palladium nitrate solution that concentration is 3g/L of preparation, the carrier of previous step is completely immersed in this solution, impregnate 30 minutes, take out and be placed on 120 DEG C dry 2 hours in baking oven；
Take the palladium nitrate solution that concentration is 5g/L of preparation, dried for previous step semi-finished product are inserted this solution along its length, make the carrier of 3/4 length immerse in solution, impregnate 30 minutes, take out and be placed on 120 DEG C dry 2 hours in baking oven.
Take the palladium nitrate solution that concentration is 8g/L of preparation, the semi-finished product that previous step obtains insert this solution along its length, and insertion one end is identical with previous step, and makes the carrier of 1/2 length immerse in solution, impregnate 30 minutes, take out and be placed on 120 DEG C dry 2 hours in baking oven.
Take the palladium nitrate solution that concentration is 10g/L of preparation, the semi-finished product that previous step obtains are inserted this solution along its length, insert one end identical with previous step, and make the carrier of 1/4 length immerse in solution, impregnate 30 minutes, taking-up is placed on 120 DEG C dry 2 hours in baking oven, then dried product is placed in Muffle furnace, heating rate is 10 DEG C/minute, 800 DEG C of roastings 3 hours, obtaining catalyst prod, wherein the gross mass of active component Pd accounts for the 0.2wt% of cordierite honeycomb ceramic carrier weight.
Comparative example
1
With deionized water as solvent, compound concentration is the palladium nitrate solution of 5g/L, standby.
Adding in deionized water by load weighted cerous nitrate and zirconium nitrate, stirring is mixed to get mixed solution, wherein with CeO2And ZrO2Meter, cerium is 1:1 with the mol ratio of zirconium, in this solution, add 2ml analyze straight alcohol solution, 1g polyethylene glycol is added after dispersed with stirring, mixed solution is placed in 70 DEG C of water-baths heating, stirring 30 minutes, obtain mixed solution, the volume of this mixed solution is 1.5 times of cordierite honeycomb ceramic carrier volume to be impregnated.
Take a size of 50mm × 25mm × 30mm cordierite honeycomb ceramic as carrier, this carrier is placed in above-mentioned mixed solution, is sufficiently impregnated with 30 minutes, take out and be placed in baking oven 180 DEG C and be dried 2 hours.
Dried for previous step carrier is placed in Muffle furnace 500 DEG C of roastings 2 hours, naturally cools to room temperature, it is thus achieved that there is the catalyst carrier of cerium zirconium coating.
Take the palladium nitrate solution that concentration is 5g/L of preparation, the carrier of previous step is completely immersed in this solution, is sufficiently impregnated with, take out and be placed on 120 DEG C dry 2 hours in baking oven；Obtaining catalyst prod, wherein the gross mass of active component Pd accounts for the 0.35wt% of cordierite honeycomb ceramic carrier weight.
Embodiment 1 is to prepare different catalyst with comparative example 1, will carry out tail gas clean-up test, obtain different tail gas clean-up effects in above-mentioned prepared catalyst filling to above-mentioned purification silencer.
Can be seen that from the above the present invention catalyst activity metal load capacity than conventional method prepare catalyst in active metal load total amount little, but the catalyst of the present invention can reach with traditional catalyst have identical even preferably catalysis activity and conversion ratio.
Claims (4)
1. an exhaust gas purifying silencing device for motor vehicle, exhaust gas purifying silencing device for motor vehicle includes cylindrical housings, one end of housing is the air inlet that is connected with enmgine exhaust, the other end of housing is gas outlet, in housing, front portion near air inlet is provided with catalyst chamber, in catalyst chamber, layering is filled with the catalyst of active component gradient distribution, gas flow channel is left between every layer of catalyst, the gas vent at catalyst chamber rear portion connects " U " type hush tube continuously, having sound attenuation hole on hush tube tube wall, the afterbody of " U " type hush tube is connected with gas outlet continuously；It is characterized in that, the preparation process of the catalyst of active component gradient distribution is as follows:
1) compound concentration is the palladium nitrate solution of 10g/L, 8g/L, 5g/L and 3g/L respectively, standby；
2) load weighted cerous nitrate and zirconium nitrate are added in deionized water, stirring is mixed to get mixed solution I, wherein in terms of cerium oxide and zirconium oxide, cerium is 1:1 with the mol ratio of zirconium, adds 2ml and analyzes straight alcohol solution, add 1g polyethylene glycol after dispersed with stirring in this solution, mixed solution is placed in 70 DEG C of water-baths heating, stirring 30 minutes, obtain mixed solution I I, the volume of this mixed solution is 1.5 times of cordierite honeycomb ceramic carrier volume to be impregnated；
3) take a size of 50mm × 25mm × 30mm cordierite honeycomb ceramic as carrier, this carrier be placed in step 2) mixed solution I I in, be sufficiently impregnated with 30 minutes, take out and be placed in baking oven 180 DEG C and be dried 2 hours；
4) dried for step 3) carrier is placed in Muffle furnace 500 DEG C of-550 DEG C of roastings 2 hours, naturally cools to room temperature, it is thus achieved that there is the catalyst carrier of cerium zirconium coating；
5) take the palladium nitrate solution that concentration is 3g/L of step 1) preparation, the carrier of step 4) is completely immersed in this solution, impregnates 30 minutes, take out and be placed on 120 DEG C dry 2 hours in baking oven；
6) palladium nitrate solution that concentration is 5g/L of step 1) preparation is taken, by dried for step 5) semi-finished product edge
Length direction inserts this solution, makes the carrier of 3/4 length immerse in solution, impregnates 30 minutes, takes out and be placed on 120 DEG C dry 2 hours in baking oven；
7) palladium nitrate solution that concentration is 8g/L of step 1) preparation is taken, semi-finished product edge step 6) obtained
Length direction inserts this solution, and insertion one end is identical with step 6), and makes the carrier of 1/2 length immerse in solution, impregnates 30 minutes, takes out and be placed on 120 DEG C dry 2 hours in baking oven；
8) palladium nitrate solution that concentration is 10g/L of step 1) preparation is taken, the semi-finished product that step 7) obtains are inserted this solution along its length, insert one end identical with step 7), and make the carrier of 1/4 length immerse in solution, impregnate 30 minutes, taking-up is placed in baking oven 120 DEG C and is dried 2 hours, dried product is then placed in Muffle furnace 800 DEG C of roastings 3 hours, it is thus achieved that catalyst prod.
2. exhaust gas purifying silencing device for motor vehicle as claimed in claim 1, it is characterised in that: the volume of catalyst chamber is the 1/3-1/2 of housing volume.
3. exhaust gas purifying silencing device for motor vehicle as claimed in claim 1, it is characterised in that: the caliber of hush tube is the 1/3-2/3 of cylindrical housings internal diameter.
4. exhaust gas purifying silencing device for motor vehicle as claimed in claim 1, it is characterised in that: in catalyst prod, the gross mass of active component Pd accounts for the 0.2wt% of cordierite honeycomb ceramic carrier weight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510011133.3A CN104500186B (en) | 2015-01-11 | 2015-01-11 | A kind of exhaust gas purifying silencing device for motor vehicle |
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| CN201510011133.3A CN104500186B (en) | 2015-01-11 | 2015-01-11 | A kind of exhaust gas purifying silencing device for motor vehicle |
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| CN104500186A CN104500186A (en) | 2015-04-08 |
| CN104500186B true CN104500186B (en) | 2016-08-17 |
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| CN100998941B (en) * | 2007-01-04 | 2012-09-05 | 华东理工大学 | Precatalyst and its preparation method |
| US8409518B2 (en) * | 2009-03-16 | 2013-04-02 | GM Global Technology Operations LLC | Sulfur tolerant perovskite supported catalysts |
| CN101947456B (en) * | 2010-08-19 | 2013-02-13 | 华南理工大学 | Integral automobile exhaust purification catalyst and preparation method thereof |
| CN102614874B (en) * | 2011-01-28 | 2014-10-08 | 比亚迪股份有限公司 | Preparation method of alumina slurry, automobile exhaust purification catalyst containing the alumina slurry and preparation method of the automobile exhaust purification catalyst containing the alumina slurry |
| JP2013231384A (en) * | 2012-04-27 | 2013-11-14 | Yamaha Motor Co Ltd | Muffler and saddle-riding type vehicle |
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Inventor after: Li Huafang Inventor before: Ye Cheng |
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Effective date of registration: 20160901 Address after: 361000 room 380, Nanshan Road, Huli District, Fujian, Xiamen, 102 Patentee after: Xiamen bright Technology Co., Ltd. Address before: Longwan Waterfront Street Wenzhou city Zhejiang province 325024 Sand Street No. 228 second floor Patentee before: WENZHOU HONGCHENGXIANG TECHNOLOGY CO., LTD. |
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