CN109374467B - Method for measuring uniformity of automobile exhaust catalyst coating - Google Patents
Method for measuring uniformity of automobile exhaust catalyst coating Download PDFInfo
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- CN109374467B CN109374467B CN201811645946.8A CN201811645946A CN109374467B CN 109374467 B CN109374467 B CN 109374467B CN 201811645946 A CN201811645946 A CN 201811645946A CN 109374467 B CN109374467 B CN 109374467B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 42
- 239000011248 coating agent Substances 0.000 title claims abstract description 31
- 238000000576 coating method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 etc. Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Catalysts (AREA)
Abstract
The invention relates to a method for measuring uniformity of an automobile exhaust catalyst coating, and belongs to the technical field of automobile exhaust catalyst physical index measurement. The coated catalyst finished product is radially cut into a plurality of samples A i with equal height, and the samples A i are weighed and evaluated after drying treatment. And then cutting each sheet sample into a plurality of pieces of samples A iBi with the same size, weighing samples A iBi at different positions after drying treatment, comparing radial sample weight differences, and evaluating the coating uniformity degree by comparing axial sample weight differences. The invention has the advantages of accuracy, rapidness, intuitiveness, simplicity, convenience and the like, and solves the problem that the coating uniformity is required to be detected by precision equipment such as XRF and the like.
Description
Technical Field
The invention relates to a method for measuring uniformity of an automobile exhaust catalyst coating, and belongs to the technical field of automobile exhaust catalyst physical index measurement.
Background
As one of the main sources of air pollution, motor vehicle exhaust contains a large amount of harmful substances including carbon monoxide, nitrogen oxides, hydrocarbons, solid suspended particles, etc., and PM 2.5, which has recently become a focus of social attention, belongs to the category of solid suspended particles. Automobile exhaust is one of the main sources of PM 2.5 in large cities and one of the most serious mishaps of the atmospheric pollution in many cities. With the rapid development of the economy in China in recent years, a large number of large cities and a plurality of ultra-large cities which are overtaken to the world level appear in China, and the development process of the urban maximization is inevitably accompanied with the surge of the conservation quantity of motor vehicles, so that huge pressure is brought to the atmospheric environment.
The improvement of the automobile exhaust emission standard is one of the most direct and effective means. And the motor vehicle with the tail gas reaching the standard needs to be supported by a post-treatment system with excellent performance indexes, namely, an excellent catalyst is needed to treat the exhaust gas discharged by the motor vehicle. The coating material is a core material of the automobile exhaust catalyst, and the uniformity of the coating material can affect the performance and the service life of the catalyst. Therefore, the detection of the coating uniformity of the coating material has great theoretical and practical significance for guiding and optimizing the production process of the catalyst coating, controlling the production cost of the catalyst and improving the overall catalytic performance of the catalyst.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for accurately, quickly and intuitively measuring the uniformity of the coating of the automobile exhaust catalyst.
According to the technical scheme, the method for measuring the uniformity of the catalyst coating of the automobile exhaust is characterized by measuring and evaluating the uniformity of the catalyst coating by taking samples of the catalyst of the automobile exhaust and adopting a weighing method; the method comprises the following specific steps:
(1) First measurement:
a1, preparing a sample: cutting the coated finished catalyst sample into a plurality of sheet-shaped samples A i with equal height by a machine;
b1, measuring sample treatment: baking the cut catalyst sample obtained in the step a1 in an oven at 95-105 ℃ for 0.4-0.6 hours, taking out the sample, and cooling the sample to room temperature in a dryer;
c1, measuring the weight: weigh sample a i from b1 with an analytical balance and record as m i;
d1, calculating the average weight and standard deviation;
(2) Second measurement:
a2, preparing a sample: cutting the sheet sample obtained in the step a1 into a plurality of samples A iBj with consistent length and width;
b2, measuring sample treatment: baking the catalyst sample cut in the step a2 in an oven at 95-105 ℃ for 0.4-0.6 hours, taking out the obtained sample, and placing the sample in a dryer for cooling to room temperature;
c2, measuring the weight: weigh sample a iBi from b2 with an analytical balance and record as m ij;
d2, calculating the average weight and deviation of the radial, axial and all samples.
Further, the analytical balance was accurate to 1mg.
Further, the baking time and temperature in the steps b1 and b2 are the same.
Further, step d) calculates the average weight according to the following formula:
The weight of the ith sheet sample in g; m ij is the j sample weight in g of the ith sheet sample; mu i is the axial coating deviation which is less than or equal to 3.5 percent, mu ij is the radial coating deviation which is less than or equal to 2 percent.
Further, after the cleavage in the steps a1 and a2, the overall permeability of the trapping catalyst was visually observed.
The invention has the beneficial effects that: the invention measures the coating uniformity of the catalyst by a weighing method, specifically, the weight of samples at different positions is weighed, and the samples are compared and evaluated. The invention uses the simplest method to accurately, quickly and intuitively evaluate the uniformity of the coating of the automobile exhaust catalyst.
Drawings
FIG. 1 is a schematic diagram of the sample preparation of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples.
The invention discloses a method for testing the coating uniformity of a catalyst coating, which is to measure the coating uniformity of the catalyst by a weighing method. The method specifically comprises the following steps:
a1, preparing a sample: the coated finished catalyst samples were machine cut into equal height sheet samples a 1~A4.
B1, measuring sample treatment: the cut catalyst sample was baked in an oven at 100 c for 0.5 hours, and the sample was removed and cooled to room temperature in a desiccator.
C1, measuring the weight: the sample was weighed with an analytical balance (precision to 1 mg) and the weight was recorded.
Table 1 sheet sample measurement information
D1, calculating average weight and deviation.
A2, preparing a sample: cutting the sheet sample obtained in a1 into a sample with a length of 13mm and 13mm width A1B1~ A1B5、A2B1~ A2B5、A3B1~ A3B5、A4B1~ A4B5.
B2, measuring sample treatment: the cut catalyst sample was baked in an oven at 100 c for 0.5 hours, and the sample was removed and cooled to room temperature in a desiccator.
C2, measuring the weight: the sample was weighed with an analytical balance (precision to 1 mg) and recorded.
D2, calculating the average weight and deviation of the radial, axial and all samples.
Table 2 sample measurement information
The measurement results show that the coated catalyst has good coating uniformity and reliable measurement results, and provides powerful and rapid data information for the production and preparation process of the catalyst.
The invention can rapidly give the coating uniformity value of the catalyst by measuring the catalyst sample after processing by a weighing method, thereby providing effective and direct data information and improving the detection working efficiency.
Claims (4)
1. A method for measuring uniformity of an automobile exhaust catalyst coating is characterized by comprising the following steps: the uniformity of the coating of the catalyst coating is measured and assessed by sampling the automobile exhaust catalyst and adopting a weighing method; the method comprises the following specific steps:
(1) First measurement:
a1, preparing a sample: cutting the coated finished catalyst sample into a plurality of sheet-shaped samples A i with equal height by a machine;
b1, measuring sample treatment: baking the cut catalyst sample obtained in the step a1 in an oven with the temperature of 95-105 ℃ for 0.4-0.6 hours, taking out the sample, and cooling the sample to room temperature in a dryer;
c1, measuring the weight: weigh sample a i from b1 with an analytical balance and record as m i;
d1, calculating the axial average weight and standard deviation according to the formulas (1) and (3);
(2) Second measurement:
a2, preparing a sample: cutting the sheet sample obtained in the step a1 into a plurality of samples A iBj with consistent length and width;
b2, measuring sample treatment: baking the catalyst sample cut in the step a2 in an oven at 95-105 ℃ for 0.4-0.6 hours, taking out the obtained sample, and placing the sample in a dryer for cooling to room temperature;
c2, measuring the weight: weigh sample a iBj from b2 with an analytical balance and record as m ij;
d2, calculating radial average weight and standard deviation according to formulas (2) and (4);
wherein M 1 is an axial average weight, M 2 is a radial average weight, and the unit g; i is the number of sheet samples, j is the j sample in the ith sheet sample; m i is the weight of the ith sheet sample in g; m ij is the j sample weight in g of the ith sheet sample; mu i is the axial coating deviation which is less than or equal to 3.5 percent, mu ij is the radial coating deviation which is less than or equal to 2 percent.
2. The method for determining uniformity of an automotive exhaust catalyst coating of claim 1, wherein: the analytical balance was accurate to 1mg.
3. The method for determining uniformity of an automotive exhaust catalyst coating of claim 1, wherein: the baking time and temperature are the same in steps b1 and b 2.
4. The method for determining uniformity of an automotive exhaust catalyst coating of claim 1, wherein: after the steps a1 and a2 are cut, the overall permeability of the trapping type catalyst is visually observed.
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| CN201811645946.8A CN109374467B (en) | 2018-12-29 | 2018-12-29 | Method for measuring uniformity of automobile exhaust catalyst coating |
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| CN201811645946.8A CN109374467B (en) | 2018-12-29 | 2018-12-29 | Method for measuring uniformity of automobile exhaust catalyst coating |
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| CN109374467B true CN109374467B (en) | 2024-08-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111811980B (en) * | 2020-08-17 | 2021-02-02 | 苏州英柏检测技术有限公司 | Portable diesel vehicle tail gas detection device |
| CN113426600B (en) * | 2021-07-09 | 2024-03-19 | 飞荣达科技(江苏)有限公司 | Control method for brazing flux coating amount of brazing liquid cooling plate |
| CN113820245B (en) * | 2021-09-14 | 2023-12-19 | 靖江市弘锦环保科技有限公司 | Automatic on-line weighing system of honeycomb coating applied to automobile exhaust gas exhaust system |
| CN114932703A (en) * | 2022-07-22 | 2022-08-23 | 广饶县计量测试检定所(广饶县产品质量检验所、广饶县橡胶轮胎产品与材料质量检验中心) | Method for detecting weight uniformity of semi-finished tire |
| CN118758805A (en) * | 2024-09-05 | 2024-10-11 | 江苏恒力化纤股份有限公司 | Method for judging whether uniformity of composite yarn is abnormal or not |
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| CN103713002A (en) * | 2013-12-27 | 2014-04-09 | 昆明贵研催化剂有限责任公司 | Method for measuring coating thickness of automotive tail gas catalyst |
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| JP2647585B2 (en) * | 1991-11-28 | 1997-08-27 | 三菱電機株式会社 | Automatic thin film measuring device |
| US5625170A (en) * | 1994-01-18 | 1997-04-29 | Nanometrics Incorporated | Precision weighing to monitor the thickness and uniformity of deposited or etched thin film |
| CN1146556A (en) * | 1995-09-08 | 1997-04-02 | 中国进出口商品检验技术研究所 | Method and sample of quick grading, estimation test of homogencity and chemical composition for raw alumina |
| CN2510849Y (en) * | 2001-12-28 | 2002-09-11 | 中国科学院广州化学研究所 | Sampler for detecting uniformity degree of paper pulp or fiber composite moulded element |
| CN1673674A (en) * | 2005-04-28 | 2005-09-28 | 湖南泰鑫瓷业有限公司 | Method for measuring nano TiO2 film thickness |
| CN101504274A (en) * | 2008-02-04 | 2009-08-12 | 上海永超真空镀铝有限公司 | Apparatus for on-line measuring micro-coating thickness change of aluminizing thin film |
| CN101659145B (en) * | 2009-09-03 | 2012-03-21 | 无锡吉兴汽车部件有限公司 | Method for improving uneven distribution of phenolic resin in glass wool |
| JP2015138271A (en) * | 2014-01-20 | 2015-07-30 | 東レ株式会社 | Unevenness analysis method |
| CN106404584A (en) * | 2016-04-15 | 2017-02-15 | 南京国轩电池有限公司 | Evaluation method for dry mixing uniformity of admixture slurry powder used for lithium ion battery |
| CN107748229B (en) * | 2017-10-16 | 2019-11-12 | 任宇齐 | A kind of mixed feed additive sodium selenite carries the detection method of quality |
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| CN103713002A (en) * | 2013-12-27 | 2014-04-09 | 昆明贵研催化剂有限责任公司 | Method for measuring coating thickness of automotive tail gas catalyst |
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