Detection method for vanadium trace amount evaporation rate of vanadium-based selective catalyst

A detection method and catalyst technology, applied in the preparation of test samples, analysis materials, instruments, etc., to achieve the effect of simple calculation method, reduction of dilution links, and reduction of digestion difficulty

Active Publication Date: 2015-01-21
CHINA AUTOMOTIVE TECH & RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And if want to realize the measurement accuracy of V trace volatilization rate reaches more than 99%, above method then all can't meet the requirement

Method used

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  • Detection method for vanadium trace amount evaporation rate of vanadium-based selective catalyst
  • Detection method for vanadium trace amount evaporation rate of vanadium-based selective catalyst
  • Detection method for vanadium trace amount evaporation rate of vanadium-based selective catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take a small sample: Use a cutting tool such as an angle grinder to peel off the metal package shell of the complete ceramic carrier SCR catalyst sample, take out the large SCR catalyst sample, and take two small catalyst samples on the large catalyst sample with a sampling tool. The volume of the small sample is 0.02L.

[0034] (2) Small sample hydrothermal aging: A hydrothermal aging simulation reactor is used to perform rapid hydrothermal aging on one of the SCR catalyst samples. The hydrothermal aging conditions are: 600°C, water vapor content 10%, and aging time 50h.

[0035] (3) Sample preparation: the fresh catalyst sample and the aged catalyst sample were respectively pulverized and ground to below 200 mesh to obtain two sample samples.

[0036] (4) Preparation and analysis of sample test solution: take 2 parallel samples of 0.01 g from the two samples respectively, and carry out heating plate digestion: put the sample in a polytetrafluoroethylene crucible, ...

Embodiment 2

[0065] (1) Aging on the engine bench

[0066] Take two SCR devices of the same batch, and one of them is subjected to a 100h endurance test on the engine bench according to HJ451-2008 "Environmental Protection Product Technical Requirements for Diesel Vehicle Exhaust Aftertreatment Devices", and then removed from the bench.

[0067] (2) Take a small sample: Cut off the exhaust pipes at the inlet ends of the two SCR devices respectively, and dig about 1g of sample powder at the center of the inlet end of the SCR catalyst.

[0068] (3) Sample preparation: Grind fresh and aged catalyst samples to below 200 mesh respectively.

[0069] (4) Analysis: Take 2 parallel samples of 0.1g from the two samples respectively, place the samples in a polytetrafluoroethylene digestion tank, add 10mLHCl, 2mLHNO 3 , 1mLHF, 5mLH 2 O, digested at 210°C for 15 minutes. After cooling to room temperature, open the can, transfer the test solution to a PET sample bottle, add water to dilute to 50g, an...

Embodiment 3

[0078] (1) Take a small sample: Use a cutting tool such as an angle grinder to peel off the metal package shell of the complete ceramic carrier SCR catalyst sample, take out the large SCR catalyst sample, and take two small catalyst samples on the large catalyst sample with a sampling tool. The volume of the small sample is 0.08L.

[0079] (2) Small sample hydrothermal aging: A hydrothermal aging simulation reactor was used to perform rapid hydrothermal aging on one of the SCR catalyst samples. The hydrothermal aging conditions were: 850°C, 20% water vapor content, and 400h aging time.

[0080] (3) Sample preparation: the fresh catalyst sample and the aged catalyst sample were respectively pulverized and ground to below 200 mesh to obtain two sample samples.

[0081] (4) Preparation and analysis of sample test solution: take 0.9 g of two parallel samples of the two samples respectively, and carry out digestion on a heating plate: place the sample in a polytetrafluoroethylene c...

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Abstract

The invention discloses a detection method for the vanadium trace amount evaporation rate of a vanadium-based SCR (Selective Catalytic Reduction) catalyst. According to the detection method provided by the invention, by adopting the method that existing element titanium is taken as a marker to the calculate vanadium trace amount evaporation rate in a catalyst formula, the segregation effect on the result during a sampling process and a sample preparing process is avoided; the marker has the characteristics that the chemical property is stable under usage conditions, and the marker is non-volatile and easy to measure; moreover, the method is reliable, simple and practicable, and is wide in applicability.

Description

technical field [0001] The invention belongs to the technical field of analysis, test and evaluation, and relates to a method for detecting the vanadium trace volatilization rate before and after aging of a vanadium-based selective catalytic reduction (SCR) catalyst with titanium as a marker. Background technique [0002] Studies have shown that nitrogen oxides (NOx) emitted by vehicles powered by diesel engines x ) is the main cause of haze weather, PM2.5 pollution, and photochemical smog, especially in Beijing, Shanghai, and Guangzhou, where about 20% to 50% of NO x from diesel vehicles. Selective catalytic reduction (NH 3 -SCR) technology for NO x The removal rate can reach more than 90%. At the same time, it can also reduce the emission of PM after optimizing and matching with the engine combustion process. x The preferred technical measure for emissions is recognized as a necessary technology for diesel engine emissions to meet National IV or higher standards. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/14G01N1/28
Inventor 李军刘悦贾旭岩李伟
Owner CHINA AUTOMOTIVE TECH & RES CENT
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