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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1

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

[0015] Add 10.0 g of tetraethyl orthosilicate to 50 ml of deionized water, add an appropriate amount of Pd(NO 2 ) 2 (NH 3 ) 2 Then use nitric acid to adjust the pH value of the system to 2 to 3, aging for 2 hours to form a gel. Mix the gel with TSC-1 mesoporous carbon molecular sieve and let it stand for 12 hours to adjust Pd:SiO 2 The mass ratio of :TSC-1 is 0.25:25:250. After drying at 80 ℃, the temperature is raised to 500 ℃ under the protection of nitrogen and kept for 6 hours, and finally Pd / SiO is reduced by 350 ℃ in hydrogen atmosphere 2 / TSC-1 catalyst.

[0016] Press 1.0 g into 20-60 mesh Pd / SiO 2 The / TSC-1 catalyst is placed in a quartz reaction tube with a diameter of 5 mm. After mixing the formaldehyde and air, it is passed into the reactor tube and enters the catalytic bed for reaction. The total gas hourly space velocity is 20,000 h -1 The volume content of formaldehyde gas in the total gas is 0....

Example Embodiment

[0017] Example 2

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

[0019] Dissolve 12.0 g cerium nitrate in 60 g deionized water, add an appropriate amount of Pd(NO 2 ) 2 (NH 3 ) 2 Then, add oxalic acid solution under stirring, the ratio of the amount of oxalic acid to cerium nitrate is 2:1, and age at 80°C until the gel is completely formed. Mix the gel with TSC-1 mesoporous carbon molecular sieve and let it stand for 12 hours to control Pt:CeO 2 The mass ratio of :TSC-1 is 0.25:25:250 and the pH value is 8-9. After 8 hours of aging, the gel will be formed. Mix the gel with TSC-1 mesoporous carbon molecular sieve and let it stand for 12 hours to adjust Pt:ZrO 2 The mass ratio of :TSC-1 is 0.25:20:250. After drying at 80 ℃ and roasting under the protection of nitrogen, the temperature is increased to 550 ℃ and kept for 6 hours, and finally Pt / ZrO is reduced by 350 ℃ in hydrogen atmosphere. 2 / TSC-1 catalyst.

[0020] Prepare 1.0 g of 20-60 mesh Pt / ZrO 2 The / TSC-1 catalyst i...

Example Embodiment

[0021] Example 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 Then use nitric acid to adjust the pH of the system to 8-10, aging for 2 hours under stirring to form a gel. Mix the gel with TSC-1 mesoporous carbon molecular sieve and let it stand for 12 hours to adjust Pd:Al 2 O 3 The mass ratio of :TSC-1 is 0.25:12.5:250. After drying at 80℃ and baking under the protection of nitrogen, the temperature is raised to 550℃ and kept for 6 hours. Finally, Pd / Al is reduced by 350℃ in hydrogen atmosphere. 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 placed in a quartz reaction tube with a diameter of 5 mm. After mixing the formaldehyde and air, it is passed into the reactor tube and enters the catalytic bed for reaction. The total gas hourly space velocity is 20,000 h -1 The volume content of formaldehyd...

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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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