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Experimental device for measuring catalytic oxidation efficiency of volatile organic compounds

A volatile organic compound, catalytic oxidation technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., to achieve the effect of meeting the high temperature in the furnace and convenient replacement

Inactive Publication Date: 2018-11-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can overcome the shortcomings of existing experimental devices, and realize accurate and rapid measurement of the conversion efficiency of catalysts to VOCs

Method used

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  • Experimental device for measuring catalytic oxidation efficiency of volatile organic compounds
  • Experimental device for measuring catalytic oxidation efficiency of volatile organic compounds
  • Experimental device for measuring catalytic oxidation efficiency of volatile organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The selection of equipment and materials in Example 1 is as follows: the target VOCs used is acetone, and the catalyst is a noble metal catalyst prepared by an equal volume impregnation method. The active component of the noble metal catalyst is Pt, and the carrier is TiO 2 , the added cocatalyst component is Ce(NO 3 ) 3 . Acetone was analytically pure acetone produced by Tianjin Yuanli Chemical Co., Ltd.

[0048] The gas chromatograph in the gas chromatograph system 12 is a GC9790 II gas chromatograph, and the detector configured by the gas chromatograph is a hydrogen flame ionization detector.

[0049] Set the temperature of constant temperature circulator A 6-1 to 0°C to maintain a stable acetone inlet concentration. Adjust the three-way ball valve A10-1 and the three-way ball valve B10-2, so that the gas path directly connected between the two three-way ball valves A and B is opened, and the gas path entering the reaction tube 15 is closed. Acetone, O 2 The mi...

Embodiment 2

[0054] The selection of each equipment and material in this embodiment 2 is as follows: the target VOCs used is ethyl acetate, and the catalyst is a hydrotalcite catalyst. The hydrotalcite catalyst is Co(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 Co / Al LDHs prepared by titration of O and alkali solution, the preparation process is: preparation solution I: Co(NO 3 ) 2 ·6H 2 O(29.103g) and Al(NO 3 ) 3 9H 2 O (7.5026g), the molar concentration ratio is 5:1, configured into a 250ml solution, the total concentration is 0.48mol / L. Preparation of Solution II: NaOH (0.24mol, 9.6g) and NaOH 2 CO 3 (0.04mol, 4.2396g), made into 250ml solution. Add solution I and solution II dropwise to a beaker with an appropriate amount of deionized water at the same time, and stir vigorously at the same time, adjust the drop rate of solutions I and II to control the pH of the mixed solution to 10-11, and suspend the obtained solution after the addition is completed The solution was placed in a d...

Embodiment 3

[0062] This implementation case 3 mainly explores the influence of water vapor on the catalyst activity. The selection of equipment and materials in the experiment is as follows: the target VOCs used is acetone, and the Pt catalyst and acetone are the same as those in Example 1. The gas chromatograph adopts GC9790Ⅱ type gas chromatograph, and the detector configured by the gas chromatograph is a hydrogen flame ionization detector.

[0063] The external circulation temperature of the saturated generator A 7-1 (acetone bubbling bottle) was set to 0°C, and the external circulation temperature of the saturated generator B7-2 (water vapor bubbling bottle) was set to 70°C. Adjust the three-way ball valve A 10-1 and the three-way ball valve B 10-2 so that the gas path directly connected between the two three-way ball valves A and B is opened, and the gas path entering the reaction tube 15 is closed. h 2 O, acetone, and O 2 The mixed gas directly enters the gas chromatography system...

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Abstract

The invention discloses an experimental device for measuring catalytic oxidation efficiency of volatile organic compounds. The experimental device comprises a gas control unit, a reactor, a reaction furnace, a preheater and a gas chromatography system, wherein the gas control unit comprises four gas paths, i.e., a nitrogen gas path, an oxygen gas path, a volatile organic compound gas path and a water vapor gas path; the tail ends of four gas paths are in parallel connection and are connected with the reactor and the gas chromatograph system through the preheater; the nitrogen gas path and theoxygen gas path are basically the same and respectively comprise a ball valve, a filter, a pressure reducing valve, a mass flow meter and a check valve which are successively connected with the outletof a steel cylinder as a starting point; the volatile organic compound gas path and the water vapor gas path are basically the same and are respectively equipped with a saturation generator on the basis of the nitrogen gas path; meanwhile, the front end of each saturation generator is provided with a sleeve pipe condenser; and each saturation generator is connected with a constant-temperature circulator in series. The experimental device provided by the invention is applicable to evaluation and screening of a catalyst, and can research aspects like reaction kinetics, reaction process and reactivation of the catalyst. The experimental device provided by the invention can accurately and rapidly measure the conversion efficiency of the catalyst to the VOCs.

Description

technical field [0001] The invention relates to a catalytic oxidation micro-reaction device, in particular to a catalytic oxidation effect evaluation device for measuring volatile organic compounds (VOCs). Background technique [0002] VOCs (volatile organic compounds) are a major air pollutant and an important precursor for the formation of atmospheric fine particulate matter (PM2.5). Among the many VOCs treatment technologies, catalytic oxidation is considered to be one of the most economical and effective treatment technologies. [0003] The essence of catalytic oxidation technology is a gas-solid phase catalytic reaction, and active oxygen participates in the deep oxidation of VOCs through the catalyst. Among them, the function of the catalyst is to reduce the activation energy of the reaction, and at the same time, its surface porous structure can enrich the pollutants and increase the reaction rate. [0004] Compared with other treatment technologies, the catalytic o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 刘庆岭付凯旋赵倩苏赟
Owner TIANJIN UNIV
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