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Method for detecting trace quantity SOX in hydrogen using adsorption concentrating

A kind of SO2, trace technology, applied in the direction of measuring device, test sample preparation, instrument, etc., can solve the problem of low detection accuracy of sulfur dioxide, achieve the effect of low cost and expense, simple operation and strong practicability

Inactive Publication Date: 2008-10-01
SHANGHAI UNIV
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Problems solved by technology

However, the detection accuracy for low concentrations of sulfur dioxide is not high

Method used

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  • Method for detecting trace quantity SOX in hydrogen using adsorption concentrating
  • Method for detecting trace quantity SOX in hydrogen using adsorption concentrating

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Embodiment 1

[0021] Embodiment one: the test conditions in the present embodiment are as follows:

[0022] Standard gas: 5ppm SO2 / H 2 standard gas,

[0023] Sample gas to be tested: contains trace amount of SO 2 of high-purity hydrogen,

[0024] Instrument: Domestic GC900, adsorption sampling device and thermal desorption furnace

[0025] Chromatographic column: PTFE packed column with GDX-502 stationary phase,

[0026] Detector: FPD, Fire Plunge Photometric Detector,

[0027] Adsorbent: GDX-502

[0028] Chromatographic conditions:

[0029] Carrier gas: N 2 60ml / min,

[0030] Oven temperature: 100°C,

[0031] Vaporization chamber temperature: 160°C,

[0032] Adsorption temperature: room temperature,

[0033] Desorption temperature: 160°C

[0034] The detection process and steps of the present embodiment are as follows:

[0035] (1) At room temperature, control the sample to be tested to contain a trace amount of SO 2 The flow rate of the hydrogen gas is about 7ml / min, and th...

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Abstract

The present invention relates to a method for detecting trace SO2 in the hydrogen with absorption and belongs to the technique filed of the trace gas detection. The method of the invention uses the method of absorption compression and uses a gas chromatography as a fundamental detection facility. The invention is characterized in that an adsorbent of GDX series is used. The adsorbent is a porous polymer bead which uses the divinyl benzene as monomer. The differences of the adsorption of the adsorbent to the sulfur dioxide under different temperatures are used for concentrating the low-concentration sulfur dioxide to the range of measurable concentration of the gas chromatographic detector. The method according to the invention can detect the concentration of the sulfur dioxide with ppb level in the high purity hydrogen, additionally the invention has the advantages of low detection cost, easy operation and strong practicability.

Description

technical field [0001] The invention relates to a method for detecting trace amounts of SO in hydrogen by means of adsorption and concentration 2 The method belongs to the technical field of trace gas detection. Background technique [0002] Hydrogen energy is recognized as a green and clean energy. Hydrogen has a high combustion calorific value, and its combustion product is water, which will not cause environmental pollution; hydrogen can directly convert chemical energy into electrical energy through fuel cells; hydrogen energy is abundant, inexhaustible and inexhaustible. [0003] For hydrogen used in fuel cells, the purity of hydrogen is very important, but generally industrial hydrogen produced from different sources contains many trace impurities. All of these impurities may have different effects on the performance of different fuel cells. For example, if 2ppm of SO 2 , when the anode adopts Pt-Ru catalyst, the fuel cell is at 1000mA / cm 2 When operating under th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/02G01N1/40
Inventor 王慧周丽刘国杰李卫清时森孙俭
Owner SHANGHAI UNIV
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