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A Headspace Extraction Method for In Situ Evaluation of the Reduction Performance of Metal Catalysts

A metal catalyst, headspace extraction technology, applied in instruments, measuring devices, scientific instruments, etc., can solve problems such as large error in results, cumbersome operation process, experimental error, etc., and achieve short processing time, strong anti-interference ability, and high efficiency. Effect

Inactive Publication Date: 2021-05-14
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, HPLC is limited by the chromatographic column, and the sample needs to go through complicated pretreatment procedures before entering the chromatographic column to prevent clogging. This process usually uses highly toxic organic solvents, and multiple extractions will cause the loss of the substance to be tested, resulting in experimental errors; compared with HPLC and GC, multi-wavelength ultraviolet spectroscopy has the advantages of simple operation and easy mastery, but It has high requirements on the composition of the solution, and it can only be used to analyze simulated wastewater containing fewer types of substances. When it is used to analyze actual wastewater and simulated wastewater containing more types of substances, it will encounter more complex mathematical calculations and The result error is large

Method used

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  • A Headspace Extraction Method for In Situ Evaluation of the Reduction Performance of Metal Catalysts
  • A Headspace Extraction Method for In Situ Evaluation of the Reduction Performance of Metal Catalysts
  • A Headspace Extraction Method for In Situ Evaluation of the Reduction Performance of Metal Catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Evaluation of Fe-Pd Bimetallic System Supported on Nanocellulose

[0050] (1) Selection of model objects and preparation of external standard solution: add 20mL of absolute ethanol to a 100mL volumetric flask in advance to prepare dichlorobenzene, chlorobenzene and benzene mother liquor 400mmol / L, take 1mL dichlorobenzene, 0.5mL Add the single mother liquor of chlorobenzene and benzene into the headspace bottle, then add 8mL deionized water to dilute, seal the headspace bottle, shake it evenly, and wait for the determination.

[0051] (2) Optimization of test parameters of headspace gas chromatography: place the solution to be tested in step (1) in a headspace sampler, keep the solution at a constant temperature of 40°C for 15min, and then purify the gas phase group in the headspace bottle with nitrogen. Blow into the gas chromatograph for analysis. Set the inlet pressure gradient to 5psi, the column temperature gradient to 10°C, gradually increase the temperature acco...

Embodiment 2

[0059] Evaluation of Carboxymethyl Cellulose Supported Nano-iron

[0060] Steps (1), (2), (3) are the same as in Example 1.

[0061] (4) Adopt headspace gas chromatography to carry out sample detection: take the prepared 400mmol / L dichlorobenzene mother liquor and dilute to 40mmol / L, then get 40mmol / L solution and add in the headspace bottle, add carboxymethyl cellulose load rapidly Nano iron, sealed. Take the same test parameters as in step (3) for analysis, and the specific operation is as follows: the headspace bottle containing the dichlorobenzene solution and carboxymethyl cellulose-loaded nano-iron is placed in a 40°C sampler oven to balance for 15min, and then Nitrogen is purged into the gas chromatographic analysis, and immediately returned to the oven box to balance again for 15 minutes after the purging, followed by purging analysis, and this cycle is repeated 6 times. The peak areas of the recorded gas chromatographic signals are 1268.4, 1153.7, 1042.5, 663.4, 554...

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Abstract

The invention discloses a headspace extraction method for in-situ evaluation of the reduction performance of metal catalysts; specifically, headspace gas chromatography is used to rapidly determine the content changes of reactants and products in the catalytic dechlorination reaction process of chlorinated aromatic compounds , so as to establish a kinetic relationship and evaluate the performance of the catalyst. The steps are: (1) selection of model substance and preparation of external standard solution, (2) optimization of headspace gas chromatography test parameters, (3) blank control experiment, (4) headspace gas chromatography for sample determination Detection, (5) calculation and kinetic analysis of results, (6) evaluation of catalyst performance. The method is superior to ordinary gas chromatography and high performance liquid chromatography, and has the advantages of no need for sample pretreatment, simple operation, easy mastery, high batch processing efficiency, and the like.

Description

technical field [0001] The invention uses headspace gas chromatography to evaluate the treatment effect of chlorinated aromatic compounds in simulated waste water catalyzed by metal catalysts, belongs to the field of environmental analysis and detection, and specifically relates to a headspace extraction method for in-situ evaluation of metal catalyst reduction performance. Background technique [0002] Chlorinated aromatic compounds are widely found in the production wastewater of dyestuffs, pesticides, papermaking, petrochemical and other industries. With the gradual tightening of environmental protection policies, the discharge standards of wastewater are constantly improving, especially for chlorinated aromatic compounds. There are increasingly strict limits on the emission content of In the list of 129 priority pollutants published by the U.S. Environmental Protection Agency (EPA), halogenated organic compounds, mainly chlorinated aromatic compounds, account for more th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 郭从宝万小芳柴欣生陈广学
Owner SOUTH CHINA UNIV OF TECH
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