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Supported noble metal catalyst for low-temperature catalytic oxidation benzene series and preparation method thereof

A precious metal catalyst and catalytic oxidation technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc., can solve the problem of unsatisfactory VOCs removal effect, low investment and operating costs, treatment Long time and other problems, to achieve good low-temperature catalytic activity, suitable for large-scale production, low complete oxidation temperature effect

Inactive Publication Date: 2008-06-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic membrane has a high separation coefficient, but it has disadvantages such as low gas permeability, poor heat resistance and corrosion resistance, easy aging and easy clogging during use.
Inorganic membrane has high permeability and heat and pressure resistance, but its gas separation coefficient is low, so the removal effect of low concentration VOCs in indoor air is not ideal
Biofilm technology has the advantages of good effect, low investment and operating costs, good safety, no secondary pollution, and easy management, but the processing time is relatively long
[0007] In the process of removing VOCs in the air, technologies such as negative ions and plasma will generate other oxidation by-products, accompanied by O 3 and nitrogen oxides are emitted, which can also cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0018] Catalyst 1-5

[0019] The specific surface area is about 320 meters 2 Each gram of activated carbon carrier was ground into 40-60 mesh particles, and after being treated at 550°C in a nitrogen flow of 50 ml / min for 1 hour, 0.025, 0.05, 0.1, 0.25 and 0.4 grams of Pd(NO 3 ) 2 2H 2 O is dissolved with 1.8, 6.4, 16 and 25.6 milliliters of absolute ethanol, respectively, and the prepared solution is added to 2 grams of activated carbon, ultrasonically oscillated for 30 minutes using an ultrasonic generator, and dried overnight at room temperature to make 0.5% , 1%, 2%, 5%, 8% Pd / activated carbon catalyst.

[0020] Catalyst 6-8

[0021] The specific surface area is about 320 meters 2 Each gram of activated carbon support was ground into 40-60 mesh particles, and after 550°C treatment in a nitrogen flow of 50 ml / min for 1 hour, 0.05 grams of Pd(NO 3 ) 2 2H 2 O was dissolved with 3.2 milliliters of acetone, acetic acid and deionized water respectively, and the solution ...

Embodiment 1

[0039] Take a certain amount of 40-60 mesh catalyst 2 and place it in a quartz tube reactor with an inner diameter of 6 mm, and pass O 2 10ml·min -1 , N 2 40ml·min -1 With the reaction gas of 800ppm dimethylbenzene, under normal pressure, by controlling the heating furnace temperature programming continuous reaction, under different space velocities, the dimethylbenzene conversion rate is 90% (T 90 ) when the conversion temperature is listed in Table 1.

[0040] Table 1

[0041] Airspeed

Embodiment 2

[0043] Take a certain amount of 40-60 mesh catalyst 1-5 and place it in a quartz tube reactor with an inner diameter of 6 mm, and pass O 2 10ml·min -1 , N 2 40ml·min -1 And the reaction gas of 800ppm benzene, the space velocity is 50,000h -1 , under normal pressure by controlling the heating furnace temperature program continuous reaction, the benzene conversion rate is 90% (T 90 ) when the conversion temperature is listed in Table 2.

[0044] Table 2

[0045] Pd load

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PUM

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Abstract

The invention discloses a supported noble metal catalyst for low-temperature catalytically oxidizing benzene series (benzene, methylbenzene and dimethylbenzene) gas to CO2 and H2O. Active components of the noble metal catalyst are: at least one of Pd, Pt, Ag, Au and Rh; carrier is at least one of active carbon, red mud, molecular sieve, aluminum sesquioxide, titanium dioxide, manganese dioxide, zirconium dioxide, silicon dioxide, cerium dioxide, lanthanum sesquioxide, cobalt oxide, magnesium oxide, zinc oxide, calcium oxide and cupric oxide. Under general pressure, in atmosphere ambient, in fixed bed reactor, with a space velocity range from 10,000 to 100,000h<-1> and at a temperature range from 110 to 210 DEG C, the catalyst can be used for directly oxidizing 100 to 800ppm benzene series gas to CO2 and H2O without byproduct, which shows good low-temperature catalytic activity. The catalyst of the invention has the advantages of simple preparation, lower complete oxidation temperature, immunity to H2O, good stability and high practical value.

Description

technical field [0001] The invention relates to a low-temperature and high-efficiency catalytic oxidation of benzene series gas into harmless CO 2 and H 2 O supported noble metal catalysts. technical background [0002] Benzene series (benzene, toluene, xylene) are one of the main pollutants in indoor and outdoor air. Short-term exposure to low-concentration benzene series gases will irritate people's eyes, skin and mucous membranes, and symptoms such as headache, nausea, and drowsiness will occur; prolonged exposure to low-concentration benzene series gases will cause Cause respiratory system, cardiopulmonary tissue, reproductive system and central nervous system diseases, and further cause tissue cancer. Studies have shown that benzene series gases are more harmful to infants and young children, and can cause fetal congenital defects (ie deformities). High concentrations of benzene series gas can directly lead to death. [0003] There are many pollution sources of ben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/63B01J23/40B01J32/00A61L9/00
Inventor 贺泓黄韶勇张长斌
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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