CN109248714A - A kind of low reaction temperatures, the manufacture craft of inferiorization wire mesh catalyst converter - Google Patents
A kind of low reaction temperatures, the manufacture craft of inferiorization wire mesh catalyst converter Download PDFInfo
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- CN109248714A CN109248714A CN201811187006.9A CN201811187006A CN109248714A CN 109248714 A CN109248714 A CN 109248714A CN 201811187006 A CN201811187006 A CN 201811187006A CN 109248714 A CN109248714 A CN 109248714A
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- coating
- catalyst converter
- manufacture craft
- inferiorization
- wire mesh
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0225—Coating of metal substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to catalyst technical fields, a kind of low reaction temperatures, inferiorization wire mesh catalyst converter manufacture craft, manufacture craft first step coating is the coating paste of 60%~80% precious metal solution containing content, then carries out drying roasting, carries out preaging processing；Second step will be coated with the precious metal solution of upper residue 20%~40% on the semi-finished product silk screen catalyst converter surface covering of production.The utility model has the advantages that carrying out forcing to intervene destroying to coating micropore unstable structure, specific surface area is accordingly reduced, and initial conversion decreases, and reaction operating temperature also just reduces, and plastic jacket is also just reduced by the risk of boiling hotization.Meanwhile high temperature preaging catalyst converter has been carried out, coating unstable structure is processed, and deterioration factor is also just corresponding after normal use reduces；Specific surface area reduces the risk for causing transformation efficiency to reduce after finally noble metal-coating solution can then make up preaging on stable structure coating, to guarantee that product reaches the requirement of emission regulation.
Description
Technical field
The invention belongs to catalyst technical field more particularly to a kind of low reaction temperatures, inferiorization wire mesh catalyst converter
Manufacture craft.
Background technique
The small-sized garden instrument of gasoline engine generally refers to gasoline-fueled power garden care implement, and annual China is small-sized
The volume of production and marketing of garden instrument all reaches as many as 17,000,000.This garden instrument is small in size, light-weight, easy to operate, but simultaneously
Muffler structure is small.
With the implementation that non-rice habitats state-two of China discharges, the exhaust emissions of gasoline engine garden instrument discharge is not able to satisfy discharge
It is required that, it is necessary to increase catalyst converter and catalysis reaction is carried out to tail gas, since muffler structure is small, muffler internal structure is complicated, and one
As catalyst converter be difficult to install, a kind of silk screen catalyst converter that can freely customize is able to satisfy the requirement of gasoline engine garden instrument.One
As the coating method of silk screen catalyst converter be all using single coating.By required precious metal solution be prepared in coating paste into
Row is prepared, and is directly coated in gauze support after handling using grinding distribution.Although the silk screen catalyst converter of this mode also can
Meet the emissions requirements of common customer machine, but the muffler that client has reflection that catalyst converter is housed mostly, in machine operation
Preceding 1 hour, muffler surface temperature is higher, and often by boiling hotization, longtime running plastics are covered with to be burnt gasoline engine plastic safety cover
Risk.And the gasoline engine initial ejection for loading onto new muffler is all very low, discharges the very fast of deterioration, deterioration factor reaches
1.5 or so, it is unfavorable for the control of gasoline exhaust.Stringent control requirement for country to safety and environmental protection, this Resolving probiems
It is extremely urgent.
Summary of the invention
Present invention aim to address the fast defects of reaction temperature height of the existing technology and degradation speed, provide one kind
Low reaction temperatures, inferiorization wire mesh catalyst converter manufacture craft.
The technical solution adopted by the present invention to solve the technical problems is: a kind of low reaction temperatures, inferiorization wire mesh
Catalyst converter manufacture craft, it is characterised in that: precious metal solution is divided into two, a copy of it is dispersed in coating, and is coated in
On carrier, coating is formed；Another is applied directly on the coating.
Wherein a content is the 60%~80% of total content, another is the 20%~40% of total content.
Preferably, drying after having coated the coating of precious metal solution to coating, preaging processing is then carried out.
Specifically, the temperature of preaging processing is 900-1050 DEG C, soaking time 1-4h.
Further, after another precious metal solution being coated on the coating, need to carry out 550 ± 50 DEG C of heat preservation 2h's
Roasting.
The utility model has the advantages that high temperature preconditioning process carries out forcing to intervene destroying to coating micropore unstable structure, specific surface area
Corresponding to reduce, initial conversion decreases, so that reaction operating temperature also reduces；And secondary noble metal-coating solution then can be with
Specific surface area reduces the risk for causing transformation efficiency to reduce after making up preaging.The present invention utilizes this low reaction temperatures inferiorization
The silk screen catalyst converter of manufacture craft production is reduced the operating temperature of muffler, and gasoline engine outer plastic cover is protected not to be melt
Change；The deterioration factor of catalyst converter itself can be reduced to 1.3 simultaneously hereinafter, improving the service life of catalyst converter itself.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is each portion structure schematic diagram of muffler of the preferred embodiment of the present invention 1.
Specific embodiment
Embodiment 1:
1, selecting gauze support specification is 34*30*10, and selection noble metal quality proportioning is Pt:Pd:Rh=0:20:1, expensive
Metal coating liquid mass concentration is 50g/ft3；
2, above-mentioned noble-metal coated liquid is diluted to 30g/ft3, it is added in coating, forms slurry, wherein the group of coating
As alumina powder, cerium zirconium object, noble metal, bonding agent, noble metal accounts for the 0.01% of slurry gross mass, is then evenly applied to gold
Belong on silk screen, carry out after normally drying, then carry out 550 ± 50 DEG C of roastings, natural cooling is stand-by；
3, after silk screen catalyst converter semi-finished product after cooling are handled using 950 ± 50 DEG C of heat preservation 4h preagings, natural cooling
For use；
4, the noble-metal coated liquid in step 1 is diluted to 20g/ft3Precious metal solution, formed surface layer coating liquid, to
With the mass ratio of the amount of the noble metal wherein contained in slurry in the amount containing noble metal and step 2 in the coating liquid of surface layer is 4:
6。
5, the dilution noble-metal coated liquid for being completed the semi-finished product of high temperature preaging by coating above-mentioned steps 4, so
Flash baking is carried out according to normal procedure afterwards, then carries out 550 ± 50 DEG C of roasting heat preservation 2h processing, is fabricated to finished product after cooling.
Embodiment 2:
2 method therefor of embodiment is similar to Example 1, and difference is, contains noble metal in the surface layer coating liquid in step 4
Amount and step 2 in the mass ratio of the amount of noble metal that contains in slurry be 2:8.
Comparative example 1:
1 method therefor of comparative example is similar to Example 1, and difference is only that, the step 3 in embodiment 1 is saved.
Comparative example 2:
The paint-on technique of old technique is, is first that 100g/L coating without precious metal (forms and embodiment phase with concentration
It is coated on carrier together), in the water suction of test carrier after drying roasting, is prepared according to the noble metal amount of water absorption and needs
Precious metal solution (wherein in the ratio and embodiment 1 of bullion content and coating noble metal total content and coating ratio phase
Together), it is then sprayed on the carrier for uploading slurry, then carries out 120 DEG C of drying, 550 DEG C of roastings.
Table 1 is the wire produced to the old technique silk screen catalyst converter finished product of comparative example 1 and the manufacture craft of the present invention of embodiment 1
Net catalyst converter finished product, has carried out muffler surface temperature contrast test, and test method is using infrared temperature tester, to survey
Warm spot carries out temperature acquisition, as a result as follows:
1. muffler surface temperature contrast test of table (attached drawing 1 is seen at each position of muffler):
As known from Table 1, embodiment 1 is compared with comparative example 1 and comparative example 2, and surface temperature has 30-55 DEG C of decline to muffler everywhere,
Illustrate that high temperature preconditioning process effectively reduces the temperature on muffler surface, avoids causing muffler to burn out since temperature is excessively high
Risk.
Table 2 is the wire mesh catalyst converter finished product produced to comparative example and embodiment, has carried out deterioration factor contrast test,
Test method is that the new muffler for being welded with wire mesh catalyst converter finished product is first changed by standard requirements engine, is mounted in test-run a machine to be measured
It tests initial ejection on device, then by machine mounted in durable 50h in durable tooling, finally loads onto resistance to after test machine engine bench test 50h
Discharge long, resistance to correspondence discharge value long afterwards are worth deterioration factor divided by new muffler initial ejection.The results are shown in Table 2:
2. deterioration factor contrast test of table
It can be seen that by the correlation data of table 2, deterioration factor of the invention has obtained apparent reduction, effectively improves vapour
Deterioration rate after oil discharge, illustrates that low reaction temperatures inferiorization silk screen catalyst converter manufacture craft of the invention has the prior art
It is significantly improved effect.
Claims (5)
1. a kind of low reaction temperatures, inferiorization wire mesh catalyst converter manufacture craft, it is characterised in that: divide precious metal solution one
It is two, a copy of it is dispersed in coating, and is coated on carrier, and coating is formed；Another is applied directly on the coating.
2. a kind of low reaction temperatures according to claim 1, inferiorization wire mesh catalyst converter manufacture craft, feature exist
In: a copy of it content is the 60%~80% of total content, another is the 20%~40% of total content.
3. a kind of low reaction temperatures according to claim 1, inferiorization wire mesh catalyst converter manufacture craft, feature exist
In: after having coated the coating of precious metal solution, coating is dried, then carries out preaging processing.
4. a kind of low reaction temperatures according to claim 3, inferiorization wire mesh catalyst converter manufacture craft, feature exist
In: the temperature of preaging processing is 900-1050 DEG C, soaking time 1-4h.
5. a kind of low reaction temperatures according to claim 1, inferiorization wire mesh catalyst converter manufacture craft, feature exist
In: after another precious metal solution is coated on the coating, need to carry out the roasting of 550 ± 50 DEG C of heat preservation 2h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811187006.9A CN109248714B (en) | 2018-10-12 | 2018-10-12 | Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst |
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| CN201811187006.9A CN109248714B (en) | 2018-10-12 | 2018-10-12 | Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst |
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| CN109248714A true CN109248714A (en) | 2019-01-22 |
| CN109248714B CN109248714B (en) | 2021-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117463364A (en) * | 2023-12-26 | 2024-01-30 | 陕西煤基特种燃料研究院有限公司 | Rh-Ru-based bimetallic load kerosene reforming catalyst and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117463364A (en) * | 2023-12-26 | 2024-01-30 | 陕西煤基特种燃料研究院有限公司 | Rh-Ru-based bimetallic load kerosene reforming catalyst and preparation method thereof |
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| CN109248714B (en) | 2021-09-21 |
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Effective date of registration: 20211011 Address after: No.18, Youshan Road, Gaochun Economic Development Zone, Nanjing, Jiangsu, 211300 Patentee after: Nanjing deprec Environmental Protection Technology Co.,Ltd. Address before: No.18, Youshan Road, Gaochun Economic Development Zone, Nanjing, Jiangsu, 211300 Patentee before: NANJING DEPURACE CATALYST Co.,Ltd. |