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Method for detecting content of vanadium element in SCR (selective catalytic reduction) catalyst

A technology of SCR catalytic converter and element content, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of inconvenient, inaccurate detection of vanadium content, calculation of vanadium recovery rate and environmental protection, etc., so as to improve detection precision, Good environmental protection, convenient and accurate calculation effect

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

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention aims to propose a method for detecting the content of vanadium in the SCR catalyst, so as to solve the inaccurate and inconvenient detection of the vanadium content in the SCR catalyst in the prior art and formulate an efficient and feasible plan for the recovery and utilization of vanadium , inconvenient and accurate calculation of the recovery rate of vanadium and poor environmental protection

Method used

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  • Method for detecting content of vanadium element in SCR (selective catalytic reduction) catalyst
  • Method for detecting content of vanadium element in SCR (selective catalytic reduction) catalyst
  • Method for detecting content of vanadium element in SCR (selective catalytic reduction) catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Detecting the content of vanadium in the SCR catalytic converter includes the following steps:

[0047] 1. Preparation of samples to be tested

[0048] 1.1 Put the SCR catalyst carrier for a car into the oven at 100°C and bake for 2 hours.

[0049] 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.

[0050] 1.3 Grind all the carrier samples, and sieve to ensure that the particle size is below 75um, and mix them evenly for testing.

[0051] 2. Preparation of blank solution and test solution

[0052] 2.1 Take 0.2595g sample and put it into the digestion tank. The blank sample tank does not weigh the sample. Add 6mL of hydrochloric acid with a mass fraction of 36-38% and 2mL of hydrogen peroxide with a mass fraction of 30% in each digestion tank and put them in the microwave In the digestion instrument, keep at 180°C for 30 minutes for digestion. In this example, a CEMmars...

Embodiment 2

[0074] The selection of the optimal working condition of the inventive method

[0075] Taking the method of the embodiment as a reference, other method steps are not changed, and only the following items are targeted for investigation:

[0076] 1. Screening of mixed acid ratio

[0077] Using the SCR catalytic converter with known vanadium element content, the ratio of hydrochloric acid, nitric acid, hydrofluoric acid and 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%, and the mass concentration of hydrofluoric acid The mass concentration is 40%, and the mass concentration of hydrogen peroxide is 30%, both of which are commercially available conventional reagents:

[0078] a. 6mL hydrochloric acid + 2mL nitric acid;

[0079] b. 6mL hydrochloric acid + 2mL nitric acid + 1mL hydrofluoric acid;

[0080] c. embodiment 1 (ie 6mL hydrochloric acid+2mL hydrogen pero...

Embodiment 3

[0099] Verification of the accuracy and precision of the method of the present invention

[0100] Select the national standard substance sample, adopt the method established in Example 1 to detect the vanadium content in the sample, and measure the precision of the method for 7 samples, and the results are shown in Table 2. The recovery rate of vanadium element was 99.3%, and the relative standard deviation was 1.5%.

[0101] Table 2

[0102]

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Abstract

The invention provides a method for detecting content of vanadium element in an SCR (selective catalytic reduction) catalyst. The method comprises the following step of using hydrochloric acid and hydrogen peroxide to digest a to-be-detected sample of the SCR catalyst. The method for detecting the content of the vanadium element in the SCR 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 SCR catalyst is digested by the hydrochloric acid and hydrogen peroxide, so that the vanadium element in the SCR catalyst can be fully dissolved; the detection accuracy is further improved; the simplicity, rapidity, accuracy and reliability are realized, and the like.

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 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 technical route has very strict req...

Claims

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Application Information

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