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Supported catalyzer for low-temperature catalytic combustion of VOCs and method for preparing supported catalyzer for low-temperature catalytic combustion of VOCs

A low-temperature catalysis and catalyst technology, applied in the fields of environmental protection and chemical engineering, can solve the problems of high cost, reduce the loading of precious metal active species, reduce production costs, etc. cost effect

Inactive Publication Date: 2014-11-12
孙超
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of high cost of traditional noble metal catalysts, a new catalyst RTCC-1 and its preparation method are disclosed. Through the use of TSC-1 mesoporous carbon carrier, based on its unique pore structure and chemical composition, it can keep the catalyst high At the same time, it significantly reduces the loading of noble metal active species in the catalyst, greatly reduces the production cost, and has a wide range of applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Pd / SiO 2 / TSC-1 catalyst preparation process:

[0015] Add 10.0 g of tetraethyl orthosilicate to 50 ml of deionized water, and add an appropriate amount of Pd(NO 2 ) 2 (NH 3 ) 2 , and then adjust the pH value of the system to 2-3 with nitric acid, and age for 2 hours to form a gel. The gel was mixed with TSC-1 mesoporous carbon molecular sieve and allowed to stand for 12 hours to adjust the Pd:SiO 2 :TSC-1 with a mass ratio of 0.25:25:250, dried at 80 °C, heated to 500 °C under nitrogen protection and kept for 6 hours, and finally reduced at 350 °C in a hydrogen atmosphere to obtain Pd / SiO 2 / TSC-1 catalyst.

[0016] Press 1.0 g into 20-60 mesh Pd / SiO 2 / The TSC-1 catalyst is loaded into a quartz reaction tube with a diameter of 5 mm, and the formaldehyde and air are mixed and then passed into the reactor tube and enter the catalytic bed for reaction. The total gas hourly space velocity of the gas is 20000 h -1 , the volume content of formaldehyde gas in the to...

Embodiment 2

[0018] Pt / CeO 2 / TSC-1 catalyst preparation process:

[0019] Dissolve 12.0 g of cerium nitrate in 60 g of deionized water, and add an appropriate amount of Pd(NO 2 ) 2 (NH 3 ) 2 , and then add oxalic acid solution under stirring, the ratio of oxalic acid to cerium nitrate substance is 2:1, and age at 80°C until the gel is completely formed. The gel was mixed with TSC-1 mesoporous carbon molecular sieve and allowed to stand for 12 hours to control the Pt:CeO 2 : TSC-1 mass ratio is 0.25:25:250 pH value to 8-9, aging for 8 hours to form a gel. The gel was mixed with TSC-1 mesoporous carbon molecular sieve and allowed to stand for 12 hours to adjust the Pt:ZrO 2 :TSC-1 with a mass ratio of 0.25:20:250, dried at 80°C, roasted under nitrogen protection and raised to 550°C for 6 hours, and finally reduced at 350°C in a hydrogen atmosphere to obtain Pt / ZrO 2 / TSC-1 catalyst.

[0020] Prepare 1.0 g of 20-60 mesh Pt / ZrO 2 / The TSC-1 catalyst is loaded into a quartz reaction ...

Embodiment 3

[0022] Pd / Al 2 o 3 / TSC-1 catalyst preparation process:

[0023] Add 15.0 g of aluminum isopropoxide to 90 ml of deionized water, and add an appropriate amount of Pd(NO 2 ) 2 (NH 3 ) 2 , and then adjust the pH value of the system to 8-10 with nitric acid, and age for 2 hours under stirring to form a gel. The gel was mixed with TSC-1 mesoporous carbon molecular sieve and allowed to stand for 12 hours to adjust the Pd:Al 2 o 3 :TSC-1 with a mass ratio of 0.25:12.5:250, dried at 80°C, roasted under nitrogen protection and raised to 550°C for 6 hours, and finally reduced at 350°C in a hydrogen atmosphere to obtain Pd / Al 2 o 3 / TSC-1 catalyst.

[0024] Prepare 1.0 g of 20-60 mesh Pd / Al 2 o 3 / The TSC-1 catalyst is loaded into a quartz reaction tube with a diameter of 5 mm, and the formaldehyde and air are mixed and then passed into the reactor tube and enter the catalytic bed for reaction. The total gas hourly space velocity of the gas is 20000 h -1 , the volume conten...

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Abstract

The invention discloses a supported mesoporous carbon catalyzer RTCC-1 for low-temperature catalytic combustion of VOCs and a method for preparing the supported mesoporous carbon catalyzer RTCC-1. Due to the fact that the TSC-1 mesoporous carbon material which has the unique physicochemical property serves as the carrier of the catalyzer, the disadvantages of a traditional catalyzer for catalytic combustion that the active metal load is high and the cost is high are eliminated. The active components of the supported catalyzer, for low-temperature catalytic combustion, prepared with the carrier include one of the precious metal Pd and the precious metal Pt and one or more of copper oxide, cerium oxide, zirconium oxide, silicon oxide and aluminium oxide. The catalyzer has extremely high room-temperature catalytic combustion activity and enables complete catalytic combustion of the VOCs such as formaldehyde, methylbenzene and benzene to be achieved at room temperature or at even lower temperature.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and chemical engineering, and specifically relates to a method for completely catalytically combusting and decomposing VOC gases such as formaldehyde and toluene into CO 2 and H 2 O-supported mesoporous carbon catalyst preparation method. Background technique [0002] Today, human beings are facing the third environmental pollution mainly "indoor air pollution" after "soot pollution" and "photochemical smog pollution". American experts found that there are more than 500 kinds of volatile organic compounds in the indoor air, among which there are more than 20 kinds of carcinogens and more than 200 kinds of pathogenic viruses. Among them, the most harmful ones are mainly radioactive pollution represented by radon; and volatile organic pollution represented by formaldehyde, toluene, benzene, and trichloroethylene. A large number of shocking facts prove that indoor air pollution h...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/42B01J23/63B01J23/89F23G7/07
Inventor 不公告发明人
Owner 孙超
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