Method for regenerating inactivated Ag/Al2O3 catalyst in situ by utilizing dielectric barrier discharge plasmas

A dielectric barrier discharge and plasma technology, which is applied in catalyst regeneration/reactivation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve catalyst deactivation and affect catalyst nitrogen oxides Removal of problems such as the ability to achieve the effect of easy operation

Active Publication Date: 2018-06-01
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complex environment of actual industrial production often leads to rapid deactivation of the catalyst, which affects the ability of the catalyst to remove nitrogen oxides in the exhaust gas. At the same time, the replacement and regeneration of the catalyst is also a big problem.

Method used

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  • Method for regenerating inactivated Ag/Al2O3 catalyst in situ by utilizing dielectric barrier discharge plasmas
  • Method for regenerating inactivated Ag/Al2O3 catalyst in situ by utilizing dielectric barrier discharge plasmas
  • Method for regenerating inactivated Ag/Al2O3 catalyst in situ by utilizing dielectric barrier discharge plasmas

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Experimental program
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Effect test

Embodiment 1

[0024] Put a long straight high-voltage electrode with a diameter of 1.5mm into a quartz electrode protection tube with an inner diameter of 2.5mm and fix it at the center of the quartz tube reactor with a fixing ring. Use a quartz reactor with a wall thickness of 4mm and an inner diameter of 8mm as the medium. Tungsten wire tightly wound stainless steel mesh is used as the grounding electrode around the tube reactor. Both the high voltage electrode and the ground electrode adopt a coaxial wire barrel structure.

[0025] Preparation of Catalyst Ag / Al2 o 3 : According to Ag and Al 2 o 3 Mass ratio, respectively weighed (2, 3, 5wt%) / Ag / Al 2 o 3 A total of 5g of silver nitrate and 20-160um small alumina particles are required. Take 5ml of deionized water to completely dissolve the silver nitrate to obtain a silver nitrate aqueous solution. Immerse the 20-160um alumina small particles in the silver nitrate aqueous solution and let it stand at room temperature 12h, then put it...

Embodiment 2

[0028] Adopt the device of embodiment 1, fresh 2%Ag / Al 2 o 3 Catalyst first in N 2 Heated to 550°C for activation treatment under the atmosphere, and then in N 2 Experiments were carried out at temperatures up to 300°C. 1500ppm C 2 h 2 , 500ppm NO, 10vt%O 2 , N 2 As a balance gas, the air speed is 15000h -1 The raw material gas is connected to the reactor for reaction, and the deactivation test reaction is carried out for 600min until the catalyst is deactivated. A deactivated catalyst is placed within the plasma generation region. The plasma discharge temperature is discharge at room temperature, the discharge voltage is 18kV peak-to-peak frequency, and the frequency is 6kHz. At the same time, the treatment atmosphere is examined separately. N 2 treated with Ar, at O 2 Two kinds of background gases were used to treat the deactivated catalyst for 2 hours under the condition of existence. O 2 -TPO,O 2 -TPO experimental condition is to take deactivated catalyst 100m...

Embodiment 3

[0030] Adopt the device of embodiment 1, fresh 2%Ag / Al 2 o 3 Catalyst first in N 2 Heated to 550°C for activation treatment under the atmosphere, and then in N 2 Experiments were carried out at temperatures up to 300°C. 1500ppm C 2 h 2 , 500ppm NO, 10vt%O 2 , N 2 As a balance gas, the air speed is 15000h -1 The raw material gas is connected to the reactor for reaction, and the deactivation test reaction is carried out for 600min until the catalyst is deactivated. A deactivated catalyst is placed within the plasma generation region. The plasma discharge temperature is discharge at room temperature, the discharge voltage is peak-to-peak 18kV, the frequency is 6kHz, and the treatment atmosphere is N 2 gas, inspected at different contents of O 2 Effect of plasma treatment on surface carbon of deactivated catalysts in the presence of conditions. O 2 -TPO,O 2 -TPO experimental condition is to take deactivated catalyst 100mg, 10%O 2 +N 2 From 100°C to 750°C in 130 minu...

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Abstract

The invention provides a method for regenerating an inactivated Ag / Al2O3 catalyst in situ by utilizing dielectric barrier discharge plasmas. The method comprises the following steps: putting the inactivated Ag / Al2O3 catalyst into a plasma generation device, wherein reaction temperature is room temperature; discharging by adopting a 5kHz to 20kHz high-voltage power supply, so as to regenerate the inactivated Ag / Al2O3 catalyst in situ. According to the method provided by the invention, the problem that a carbon-containing substance, which is generated by incomplete reaction in hydrocarbon selective catalytic reduction reaction, is deposited on the surface of the catalyst so that the catalyst is inactivated is can be effectively solved; the plasma generation device is simple and convenient tooperate and treatment temperature is the room temperature; meanwhile, a treatment atmosphere is conventional gas; the inactivated catalyst is can be regenerated even under an air background gas condition.

Description

[0001] This application is the application number 2017107642101, the application date is August 30, 2017, and the title of the invention is "Ag / Al deactivated by dielectric barrier discharge plasma 2 o 3 A divisional application for a method for in-situ regeneration of catalysts. technical field [0002] The invention belongs to the field of air pollution control, and includes a method for selectively catalytically reducing nitrogen oxides by hydrocarbons to cause catalyst deactivation, and using a "packed bed" type dielectric barrier discharge reactor to treat the deactivated catalyst to regenerate its activity. Exploration of the reaction atmosphere, reaction temperature and oxygen content for the removal of carbon species on the surface of deactivated catalysts. Background technique [0003] Environmental pollution such as air pollution, soil pollution and water pollution is becoming more and more serious, which is the main problem affecting human health and people's qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/00B01J23/96B01J23/50
CPCB01J23/50B01J23/96B01J38/00
Inventor 牛金海牛春杰刘东平
Owner DALIAN NATIONALITIES UNIVERSITY
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