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Method for detecting contents of vanadium, tungsten and titanium elements in SCR (selective catalytic reduction) catalyst

A technology of SCR catalyst and element content, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of inaccurate detection, inconvenient calculation of vanadium, tungsten and titanium recycling, inconvenient calculation, etc., to achieve convenient and accurate calculation, improve The effect of detection precision

Inactive Publication Date: 2018-03-30
CHINA AUTOMOTIVE TECH & RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention aims to propose a detection method for the content of vanadium, tungsten and titanium in the SCR catalyst, so as to solve the inaccurate detection of the content of vanadium, tungsten and titanium in the SCR catalyst in the prior art and the inconvenient recovery of vanadium, tungsten and titanium Taking advantage of the problems of formulating an efficient and feasible plan, inconvenient and accurate calculation of the recovery rate of vanadium, tungsten and titanium, difficulty in simultaneously detecting vanadium, tungsten and titanium elements, and low detection efficiency

Method used

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  • Method for detecting contents of vanadium, tungsten and titanium elements in SCR (selective catalytic reduction) catalyst
  • Method for detecting contents of vanadium, tungsten and titanium elements in SCR (selective catalytic reduction) catalyst
  • Method for detecting contents of vanadium, tungsten and titanium elements in SCR (selective catalytic reduction) catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Detecting the content of vanadium, tungsten and titanium elements in the SCR catalytic converter includes the following steps:

[0049] 1. Preparation of samples to be tested

[0050] 1.1 Put the SCR catalyst carrier for a car into the oven at 100°C and bake for 2 hours.

[0051] 1.2 Take out the cooled carrier, weigh 1607.82g on a balance, measure the diameter and height with a caliper, and calculate the volume to be 2.8964L.

[0052] 1.3 Grind all the carrier samples, and sieve to ensure that the particle size is below 75um, and mix them evenly for testing.

[0053] 2. Preparation of blank solution and test solution

[0054] 2.1 Put 0.2530g sample into the digestion tank, do not weigh the sample in the blank sample tank, add 8mL of hydrochloric acid with a mass fraction of 36-38%, 2mL of nitric acid with a mass fraction of 65-68%, and 1mL of mass fraction in each digestion tank A fraction of 40% hydrofluoric acid was put into a microwave digestion apparatus and kep...

Embodiment 2

[0076] The selection of the optimal working condition of the inventive method

[0077] Taking the method of the embodiment as a reference, other method steps are not changed, and only the following items are targeted for investigation:

[0078] 1. Screening of mixed acid ratio

[0079] Using an SCR catalyst with known content of vanadium, tungsten and titanium elements, the ratio of hydrochloric acid, nitric acid, hydrofluoric acid, hydrogen peroxide mixed acid was investigated respectively, the mass concentration of hydrochloric acid was 36-38%, the mass concentration of nitric acid was 65-68%, hydrogen The mass concentration of hydrofluoric acid is 40%, and the mass concentration of hydrogen peroxide is 30%, both of which are commercially available conventional reagents:

[0080] a. 6mL hydrochloric acid + 2mL nitric acid;

[0081] b. 6mL hydrochloric acid + 2mL nitric acid + 1mL hydrofluoric acid;

[0082] c. 6mL hydrochloric acid + 2mL hydrogen peroxide;

[0083] d. 6m...

Embodiment 3

[0105] Verification of the accuracy and precision of the method of the present invention

[0106] Select the national standard material sample, use the method established in Example 1 to detect the content of vanadium, tungsten and titanium in the sample, and measure the precision of the method for 7 samples. The results are shown in Table 2. The recoveries of vanadium, tungsten and titanium were 101.0%, 100.7% and 101.7% respectively, and the relative standard deviations were 1.0%, 2.2% and 0.3%, respectively.

[0107] Table 2

[0108]

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Abstract

The invention provides a method for detecting contents of vanadium, tungsten and titanium elements in an SCR (selective catalytic reduction) catalyst. The method comprises the following step of usinghydrochloric acid, nitric acid and hydrofluoric acid to digest a to-be-detected sample of the SCR catalyst. The method for detecting the contents of the vanadium, tungsten and titanium elements in theSCR catalyst has the advantages that a detection plan is determined by sample preparation, specimen dissolving method, standard solution preparation and the like; the to-be-detected sample of the SCRcatalyst is digested by the hydrochloric acid, nitric acid and hydrofluoric acid, so that the vanadium, tungsten and titanium elements in the SCR catalyst can be fully dissolved, and the contents ofthe three elements can be detected; the detection accuracy is further improved; simplicity, rapidity, accuracy and reliability are realized, and the like; after the contents of vanadium, tungsten andtitanium elements are detected, an efficient and feasible plan can be conveniently made for the recycling of vanadium, tungsten and titanium elements, and the recycling rate of vanadium, tungsten andtitanium elements can be convenient to calculate accurately .

Description

technical field [0001] The invention belongs to the technical field of automobile testing, and in particular relates to a method for detecting the content of vanadium, tungsten and titanium elements in an SCR catalytic converter. Background technique [0002] Automobile catalytic converter is an effective device to reduce the emission of automobile exhaust pollutants. The harmful components of diesel engine exhaust mainly include CO, HC, NOx, sulfide and particulate matter. Diesel engine post-treatment purification technology mainly includes particulate filter (DPF), particulate oxidation catalyst (DOC), lean mixture NOx trap technology (LNT), and selective catalytic reduction technology (SCR). For diesel vehicles, there are currently two relatively mature diesel vehicle exhaust purification technology routes, the EGR (Exhaust Gas Recirculation) + DPF route represented by the United States and the optimized combustion + SCR route represented by Europe. Since the EGR+DPF tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/44
Inventor 姚慧王坤吕恒绪杨惠玲王鑫
Owner CHINA AUTOMOTIVE TECH & RES CENT
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