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Method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp

A low-pressure mercury lamp, photocatalytic technology, applied in separation methods, chemical instruments and methods, chemical/physical/physicochemical processes using energy, etc., to achieve the effect of low conversion cost, fast conversion rate and high conversion rate

Inactive Publication Date: 2011-01-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the stability of methane, this method has not been reported in the photocatalytic degradation of methane.

Method used

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  • Method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp
  • Method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp
  • Method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The mixed gas uses the mixed gas of the high-pressure steel cylinder, and the CH in the gas 4 The content accounts for about 90%, CO 2 About 10%;

[0028] A glass reaction device is adopted, and the effective volume of the device is 2.2L; the main wavelength of the low-pressure mercury lamp used is 253.4nm, and the power is 20W; a cylindrical titanium mesh plate with a radius of 5cm and a height of 12.5cm is used to cover the light-emitting part of the low-pressure mercury lamp ; In addition, the temperature and humidity recorder of Hangzhou Zeda Instrument Factory was used to record the temperature and humidity changes during the entire reaction process.

[0029] Step 1: Connect the experimental device and install the catalyst to coat TiO 2 After the titanium screen, pass the mixed gas into the reaction container, adjust the content and humidity of the gas, measure the gas at the gas outlet, wait until the methane content in the container reaches 0.6542g / L, and the r...

Embodiment 2

[0036] The mixed gas uses the mixed gas of the high-pressure steel cylinder, and the CH in the gas 4 The content accounts for about 50%, CO 2 About 50%;

[0037]A glass reaction device is adopted, and the effective volume of the device is 2.2L; the main wavelength of the low-pressure mercury lamp used is 253.4nm, and the power is 20W; a cylindrical titanium mesh plate with a radius of 5cm and a height of 12.5cm is used to cover the light-emitting part of the low-pressure mercury lamp ; In addition, the temperature and humidity recorder of Hangzhou Zeda Instrument Factory was used to record the temperature and humidity changes during the entire reaction process.

[0038] Step 1: Connect the experimental device and install the catalyst to coat TiO 2 After the titanium screen, pass the mixed gas into the reaction container, adjust the content and humidity of the gas, measure the gas at the gas outlet, wait until the methane content in the container reaches 0.3820g / L, and the re...

Embodiment 3

[0045] The mixed gas uses the mixed gas of the high-pressure steel cylinder, and the CH in the gas 4 The content accounts for about 10%, CO 2 About 90%;

[0046] A glass reaction device is adopted, and the effective volume of the device is 2.2L; the main wavelength of the low-pressure mercury lamp used is 253.4nm, and the power is 20W; a cylindrical titanium mesh plate with a radius of 5cm and a height of 12.5cm is used to cover the light-emitting part of the low-pressure mercury lamp ; In addition, the temperature and humidity recorder of Hangzhou Zeda Instrument Factory was used to record the temperature and humidity changes during the entire reaction process.

[0047] Step 1: Connect the experimental device and install the catalyst to coat TiO 2 After the titanium screen, pass the mixed gas into the reaction container, adjust the content and humidity of the gas, measure the gas at the gas outlet, wait until the methane content in the container reaches 0.0073g / L, and the r...

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Abstract

The invention discloses a method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp. According to the invention, photocatalysis decomposing of methane is implemented by using a low pressure mercury lamp (dominant wavelength is 253.7nm) as light source and TiO2 as catalyst in a manner of intermittent illumination, i.e. the lamp is turned on for a certain time, then turned off for a period of time and turned off once again. The method for decomposing high-concentration methane mixed gas by fast photocatalysis by using low pressure mercury lamp realizes 78-92% of the conversion rate and 10.15-884mg / of the conversion speed, and has the advantages of fast conversion speed, high conversion rate, low conversion cost, etc.

Description

technical field [0001] The invention relates to a method for rapidly decomposing high-concentration methane mixed gas by photocatalysis at normal temperature and pressure. Background technique [0002] Methane is a greenhouse gas whose CH 3 The dissociation energy of the —H bond is 435 kJ / mol, which is difficult to convert. TiO 2 It is a photocatalytic material with high activity, no secondary pollution, low price and easy operation. At present, the research on methane photocatalysis mainly uses vacuum ultraviolet light (main wavelength is 185nm) as light source, TiO 2 It is a catalyst, and the method adopted is continuous photolysis, that is, the vacuum ultraviolet lamp is continuously turned on during the entire reaction process. This method of vacuum ultraviolet light illumination cannot be realized in practical applications: First, due to the transmission ability of vacuum ultraviolet light in the air The second is that the conversion efficiency of methane is low bec...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/72B01J19/12
Inventor 王罗春李晓华刘克家傅洁琦李春秋
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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