CN109248714B - Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst - Google Patents
Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst Download PDFInfo
- Publication number
- CN109248714B CN109248714B CN201811187006.9A CN201811187006A CN109248714B CN 109248714 B CN109248714 B CN 109248714B CN 201811187006 A CN201811187006 A CN 201811187006A CN 109248714 B CN109248714 B CN 109248714B
- Authority
- CN
- China
- Prior art keywords
- coating
- low
- temperature
- noble metal
- catalyst
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 27
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 238000000576 coating method Methods 0.000 claims abstract description 35
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 23
- 230000032683 aging Effects 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 230000015556 catabolic process Effects 0.000 claims abstract description 6
- 239000010970 precious metal Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 abstract description 4
- 239000011265 semifinished product Substances 0.000 abstract description 3
- 239000006255 coating slurry Substances 0.000 abstract description 2
- 230000003197 catalytic effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 230000003584 silencer Effects 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
Abstract
The invention relates to the technical field of catalysts, in particular to a low-reaction-temperature and low-degradation wire mesh catalyst manufacturing process, which comprises the steps of coating slurry containing 60-80% of noble metal solution in the first step, drying, roasting and pre-aging; secondly, coating the surface coating of the semi-finished product of the screen catalytic converter with the residual 20 to 40 percent of noble metal solution. Has the advantages that: the coating micropore unstable structure is forcedly interfered and destroyed, the specific surface area is correspondingly reduced, the initial conversion rate is reduced, the reaction working temperature is reduced, and the risk of being scalded is reduced by the plastic cover. Meanwhile, the catalyst is pre-aged at high temperature, the unstable structure of the coating is treated, and the degradation coefficient is correspondingly reduced after the catalyst is normally used; finally, the precious metal solution is coated on the structural stable coating, so that the risk of reduction of conversion efficiency caused by reduction of specific surface area after pre-aging can be compensated, and the product can meet the requirements of emission regulations.
Description
Technical Field
The invention belongs to the technical field of catalysts, and particularly relates to a manufacturing process of a low-reaction-temperature and low-degradation wire mesh catalyst.
Background
Gasoline engine small-size garden instrument generally refers to the power gardens nursing tool who uses petrol as the fuel, and the output and sales volume of the small-size garden instrument of china all reaches 1700 tens of thousands of every year. The garden tool is small in size, light in weight and convenient to operate, and meanwhile the silencer is small in structure.
Along with the implementation of the non-road national-II emission in China, the exhaust emission of gasoline engine garden tools can not meet the emission requirement, a catalyst must be added to carry out catalytic reaction on the exhaust, and as the structure of the silencer is small, the internal structure of the silencer is complex, the general catalyst is difficult to install, and the wire mesh catalyst which can be freely customized can meet the requirement of the gasoline engine garden tools. The coating mode of the common screen catalyst is to use a single coating. The required noble metal solution is prepared in the coating slurry for preparation, and is directly coated in the silk screen carrier after grinding and dispersing treatment. Although the wire mesh catalyst can also meet the emission requirements of common customers, most customers have silencers with catalysts, the surface temperature of the silencer is high in the first 1 hour of the running of the machine, a plastic protection cover of a gasoline engine is often scalded, and the plastic cover runs for a long time and has the risk of burning. Moreover, the initial emission of the gasoline engine provided with the new silencer is very low, the emission is very fast to deteriorate, the deterioration coefficient reaches about 1.5, and the control of the emission of the gasoline engine is not facilitated. Aiming at the strict control requirements of the country on safety and environmental protection, the problem is urgently solved.
Disclosure of Invention
The invention aims to overcome the defects of high reaction temperature and high degradation speed in the prior art, and provides a manufacturing process of a low-reaction-temperature and low-degradation wire mesh catalyst.
The technical scheme adopted by the invention for solving the technical problems is as follows: a low reaction temperature and low degradation wire mesh catalyst manufacturing process is characterized in that: dividing the noble metal solution into two parts, wherein one part is dispersed into the coating and coated on the carrier to form a coating; the other was coated directly on the coating.
Wherein, one part accounts for 60 to 80 percent of the total content, and the other part accounts for 20 to 40 percent of the total content.
Preferably, after the coating of the noble metal solution is applied, the coating is dried and then subjected to a pre-aging treatment.
Specifically, the temperature of the pre-aging treatment is 900-.
Further, after another precious metal solution is coated on the coating, roasting is carried out for 2 hours at the temperature of 550 +/-50 ℃.
Has the advantages that: the high-temperature pre-aging process carries out forced intervention damage on the coating micropore unstable structure, the specific surface area is correspondingly reduced, the initial conversion rate is reduced, and the reaction working temperature is also reduced; and the risk of the reduction of the conversion efficiency caused by the reduction of the specific surface area after the pre-aging can be compensated by coating the noble metal solution for the second time. The silk screen catalyst produced by the low reaction temperature and low degradation manufacturing process reduces the working temperature of the silencer and protects the plastic cover outside the gasoline engine from being melted; meanwhile, the deterioration coefficient of the catalyst can be reduced to be less than 1.3, and the service life of the catalyst is prolonged.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of the structure of each part of a muffler according to preferred embodiment 1 of the present invention.
Detailed Description
Example 1:
1. the specification of the selected wire mesh carrier is 34 x 30 x 10, the mass ratio of the selected noble metal is Pt, Pd, Rh is 0:20:1, and the mass concentration of the noble metal coating liquid is 50g/ft3；
2. The noble metal coating solution was diluted to 30g/ft3Adding the powder into a coating to form a slurry, wherein the coating comprises alumina powder, cerium-zirconium substances, precious metals and a binder, the precious metals account for 0.01 percent of the total mass of the slurry, then uniformly coating the slurry on a metal wire mesh, baking the metal wire mesh at 550 +/-50 ℃ after normal drying, and naturally cooling the metal wire mesh for later use;
3. after the cooled semi-finished product of the wire mesh catalyst is subjected to pre-aging treatment by heat preservation at 950 +/-50 ℃ for 4 hours, naturally cooling for later use;
4. diluting the noble metal coating liquid in the step 1 to 20g/ft3Forming a surface coating solution for standby, wherein the mass ratio of the amount of the noble metal contained in the surface coating solution to the amount of the noble metal contained in the slurry in the step 2 is 4: 6.
5. And (3) coating the high-temperature pre-aged semi-finished product with the diluted precious metal coating solution obtained in the step (4), then quickly drying according to a normal program, roasting at 550 +/-50 ℃ for 2h, and cooling to obtain the finished product.
Example 2:
example 2 the method used was similar to example 1 except that the mass ratio of the amount of noble metal contained in the top coat liquid in step 4 to the amount of noble metal contained in the slurry in step 2 was 2: 8.
Comparative example 1:
comparative example 1 the process used was similar to example 1 except that step 3 of example 1 was omitted.
Comparative example 2:
the coating technology of the old process is that firstly coating paint (the composition is the same as that of the embodiment) without noble metal with the concentration of 100g/L is coated on a carrier, after drying and roasting, the carrier absorbs water, noble metal solution is prepared according to the water absorption amount and the required noble metal amount (wherein, the ratio of the noble metal content and the paint is the same as that of the total noble metal content and the paint in the embodiment 1), then the noble metal solution is sprayed on the carrier loaded with the slurry, and then the carrier is dried at 120 ℃ and roasted at 550 ℃.
Table 1 shows the comparative test of the surface temperature of the muffler performed on the mesh catalyst finished product of the old process of comparative example 1 and the mesh catalyst finished product of the manufacturing process of the present invention of example 1, in which an infrared temperature tester is used to collect the temperature at the temperature measuring point, and the results are as follows:
TABLE 1 muffler surface temperature comparison test (see FIG. 1 for muffler parts):
as can be seen from Table 1, in example 1, the surface temperature of each part of the silencer is reduced by 30-55 ℃ compared with comparative example 1 and comparative example 2, which shows that the high-temperature pre-aging process effectively reduces the surface temperature of the silencer and avoids the risk of burning out the silencer due to overhigh temperature.
Table 2 shows the comparative test of the deterioration coefficient of the finished wire mesh catalyst produced in the comparative example, in which the engine is replaced by a new muffler welded with the finished wire mesh catalyst according to the standard requirements, the new muffler is mounted on the machine to be tested to test the initial emission, the machine is mounted on the durable device to test for 50h, the bench of the testing machine is mounted to test for 50h to test the durable emission, and the deterioration coefficient is obtained by dividing the corresponding emission value after the durable test by the initial emission value of the new muffler. The results are shown in table 2:
TABLE 2 degradation coefficient comparison test
As can be seen from the comparative data in Table 2, the deterioration coefficient of the invention is obviously reduced, the deterioration rate after gasoline emission is effectively improved, and the manufacturing process of the low-reaction-temperature and low-deterioration wire mesh catalyst has an obvious improvement effect on the prior art.
Claims (2)
1. A low reaction temperature and low degradation wire mesh catalyst manufacturing process is characterized in that: dividing the noble metal solution into two parts, wherein one part is dispersed into the coating and coated on the carrier to form a coating; the other part is directly coated on the coating;
the mass content of the noble metal solution dispersed in the coating is 60-80% of the total content, and the mass content of the other part is 20-40% of the total content;
after the coating of the noble metal solution is coated, the coating is dried and then is subjected to pre-aging treatment,
the temperature of the pre-aging treatment is 900-.
2. The process of claim 1, wherein the catalyst comprises: and after coating the other precious metal solution on the coating, roasting at 550 +/-50 ℃ for 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187006.9A CN109248714B (en) | 2018-10-12 | 2018-10-12 | Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187006.9A CN109248714B (en) | 2018-10-12 | 2018-10-12 | Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109248714A CN109248714A (en) | 2019-01-22 |
| CN109248714B true CN109248714B (en) | 2021-09-21 |
Family
ID=65045180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811187006.9A Active CN109248714B (en) | 2018-10-12 | 2018-10-12 | Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109248714B (en) |
Families Citing this family (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 bimetal supported kerosene reforming catalyst and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092697A (en) * | 1993-02-08 | 1994-09-28 | 株式会社金星社 | The preparation method of exhaust gas purifying catalyst |
| CN2871859Y (en) * | 2006-02-28 | 2007-02-21 | 温州德普瑞克环保三元催化器有限公司 | Purification catalyzer of diesel engine |
| CN103084176A (en) * | 2012-12-10 | 2013-05-08 | 浙江达峰汽车技术有限公司 | Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof |
| CN103638936A (en) * | 2013-12-24 | 2014-03-19 | 浙江师范大学 | Spinel-perovskite composite catalyst for purifying industrial organic waste gas and preparation method of spinel-perovskite composite catalyst |
| CN103736525A (en) * | 2013-12-27 | 2014-04-23 | 吉林省众鑫汽车装备有限公司 | Coating method of fiber connection layers of metal fiber carriers |
| CN105344352A (en) * | 2015-11-26 | 2016-02-24 | 南京德普瑞克催化器有限公司 | Preparation method for active coating layer of metallic catalytic converter, coating layer prepared by method and metallic catalytic converter |
| CN105935590A (en) * | 2008-08-27 | 2016-09-14 | 优美科催化剂日本有限公司 | Exhaust gas purification catalyst and method for purifying exhaust gas by using same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100588460C (en) * | 2008-02-04 | 2010-02-10 | 北京英泰世纪环境科技有限公司 | A kind of double-layer noble metal active component catalyst and its preparation method |
| CN101444733B (en) * | 2008-12-31 | 2012-05-02 | 中国科学院兰州化学物理研究所 | Anti-sulfur poisoning automobile exhaust gas purification catalyst and preparation method thereof |
| EP3151949A1 (en) * | 2014-06-06 | 2017-04-12 | Clean Diesel Technologies, Inc. | Rhodium-iron catalysts |
| WO2015190754A1 (en) * | 2014-06-10 | 2015-12-17 | 주식회사 엘지화학 | Method for manufacturing multi-component composite metal oxide catalyst |
| US20160167024A1 (en) * | 2014-12-16 | 2016-06-16 | Clean Diesel Technologies, Inc. | Synergized PGM Catalyst Systems Including Rhodium for TWC Application |
| CN107790124A (en) * | 2016-08-31 | 2018-03-13 | 重庆辉虎催化剂有限公司 | Three-component Catalytic Converters for Automobiles |
| GB2553339A (en) * | 2016-09-02 | 2018-03-07 | Johnson Matthey Plc | Improved NOx trap |
| CN108465482B (en) * | 2018-03-06 | 2020-08-11 | 武汉理工大学 | A kind of method for preparing high-efficiency anthraquinone hydrogenation catalyst from FCC waste catalyst |
-
2018
- 2018-10-12 CN CN201811187006.9A patent/CN109248714B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092697A (en) * | 1993-02-08 | 1994-09-28 | 株式会社金星社 | The preparation method of exhaust gas purifying catalyst |
| CN2871859Y (en) * | 2006-02-28 | 2007-02-21 | 温州德普瑞克环保三元催化器有限公司 | Purification catalyzer of diesel engine |
| CN105935590A (en) * | 2008-08-27 | 2016-09-14 | 优美科催化剂日本有限公司 | Exhaust gas purification catalyst and method for purifying exhaust gas by using same |
| CN103084176A (en) * | 2012-12-10 | 2013-05-08 | 浙江达峰汽车技术有限公司 | Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof |
| CN103638936A (en) * | 2013-12-24 | 2014-03-19 | 浙江师范大学 | Spinel-perovskite composite catalyst for purifying industrial organic waste gas and preparation method of spinel-perovskite composite catalyst |
| CN103736525A (en) * | 2013-12-27 | 2014-04-23 | 吉林省众鑫汽车装备有限公司 | Coating method of fiber connection layers of metal fiber carriers |
| CN105344352A (en) * | 2015-11-26 | 2016-02-24 | 南京德普瑞克催化器有限公司 | Preparation method for active coating layer of metallic catalytic converter, coating layer prepared by method and metallic catalytic converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109248714A (en) | 2019-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11642659B2 (en) | Catalyst for removing volatile organic compounds and preparation method therefor | |
| CN106732585A (en) | A kind of VOCs catalytic burning integral types catalyst and preparation method thereof | |
| CN103127951B (en) | Low temperature SCR catalyst used for diesel car tail gas denitration and preparation method | |
| CN113304745B (en) | Pt-Pd-Rh ternary catalyst and preparation method thereof | |
| CN103752338B (en) | For the preparation method of the oxidation catalyst of purification of diesel tail gas | |
| CN102626633B (en) | Supported composite Co3O4/CeO2-Al2O3/cordierite catalyst, preparation method and use thereof | |
| US20240066505A1 (en) | Noble metal single atom supported three-way catalyst and preparation method therefor and use thereof | |
| CN108837829B (en) | Preparation method of layered three-way catalyst for natural gas vehicle | |
| CN106807432A (en) | A kind of Pt Pd bimetallic catalysts for NO oxidations and preparation method thereof | |
| CN108114718A (en) | A kind of Ce-Zr-M overall structures combustion catalyst and preparation method | |
| CN109248714B (en) | Manufacturing process of low-reaction-temperature and low-degradation wire mesh catalyst | |
| CN105797766A (en) | Integrated catalyst applied to catalytic combustion of methane and preparation method thereof | |
| CN109589960A (en) | A kind of wall-flow type low precious metal content catalyst, preparation method and applications | |
| AU2008361642A1 (en) | A prepositive oxidation catalyst for diesel vehicles and its preparation method | |
| CN102921448B (en) | Catalyst for purifying automobile exhaust | |
| CN111375423B (en) | High-temperature catalytic combustion catalyst and preparation method thereof | |
| CN111939917B (en) | DPF catalyst with good sulfur resistance and preparation method thereof | |
| CN1872409B (en) | A kind of automobile exhaust gas purification catalyst and preparation method thereof | |
| CN110987696B (en) | Evaluation method for firmness of wall-flow catalyst coating | |
| CN100374199C (en) | A kind of preparation method of cerium-zirconium composite oxide supported palladium catalyst | |
| CN112517003B (en) | Catalyst for particle catcher of gasoline car and preparation method thereof | |
| CN107213920A (en) | A kind of Ag-Ti-Zr catalyst and preparation method for the NO that degrades | |
| CN110813301A (en) | High-dispersion supported perovskite catalyst and preparation method and application thereof | |
| CN102343266A (en) | Preparation method of supported catalyst and supported catalyst | |
| CN104759281B (en) | A kind of preparation method of the composite oxide catalysts for purification diesel engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211011 Address after: 211300 No. 18, Youshan Road, Gaochun Economic Development Zone, Nanjing, Jiangsu Patentee after: Nanjing deprec Environmental Protection Technology Co.,Ltd. Address before: 211300 No. 18, Youshan Road, Gaochun Economic Development Zone, Nanjing, Jiangsu Patentee before: NANJING DEPURACE CATALYST CO.,LTD. |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A manufacturing process for a low reaction temperature and low degradation metal wire mesh catalyst Granted publication date: 20210921 Pledgee: Ningbo Bank Co.,Ltd. Nanjing Branch Pledgor: Nanjing deprec Environmental Protection Technology Co.,Ltd. Registration number: Y2024980017325 |