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Carbon nanotube-supported catalyst applicable to oxidizing atmosphere and preparation method thereof

A technology of supported catalysts and carbon nanotubes, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve uniform dispersion, good stability, good activity and The effect of stability

Inactive Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] At present, the related research on CNTs as the carrier is all around the reducing atmosphere, but there are few reports on the use of CNTs in the oxidizing atmosphere.

Method used

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  • Carbon nanotube-supported catalyst applicable to oxidizing atmosphere and preparation method thereof
  • Carbon nanotube-supported catalyst applicable to oxidizing atmosphere and preparation method thereof
  • Carbon nanotube-supported catalyst applicable to oxidizing atmosphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 1g of carbon nanotubes (outer diameter 10-20nm, length 10-30μm, specific surface area 210m 2 / g) was added to the mixture of 200ml concentrated sulfuric acid and 100ml concentrated nitric acid, ultrasonically dispersed for 10min, then refluxed at 60°C for 10h under stirring, washed and filtered, washed with water until the pH value of the filtrate was neutral, and dried at 60°C for 24h. A pretreated carbon nanotube carrier is obtained. Measure 3ml of ethanol solution of chloropalladium-platinic acid with a concentration of 2.7mg / mlPd and 1.4mg / mlPt, add the pretreated carbon nanotube carrier, stir evenly, then dry at 60°C for 24h, and then dry the dried The product was calcined at 500°C for 2 hours to obtain a 0.8wt%Pd-0.4wt%Pt / MWNTs catalyst.

Embodiment 2

[0044] Weigh 1g of carbon nanotubes (outer diameter 20-30nm, length 10-20μm, specific surface area 110m 2 / g) was added to the mixture of 100ml concentrated sulfuric acid and 100ml concentrated nitric acid, ultrasonically dispersed for 5min, then refluxed at 80°C for 3h under stirring, washed and filtered, washed with water until the pH value of the filtrate was neutral, and dried at 100°C for 18h. A pretreated carbon nanotube carrier is obtained. Measure 2ml of the acetone solution of palladium chloride-platinic acid with a concentration of 10.41mg / ml Pd and 5.21mg / ml Pt, add the pretreated carbon nanotube carrier, stir evenly, then dry at 80°C for 20h, and then dry The product was calcined at 200°C for 4h to obtain a noble metal 2wt%Pd-1wt%Pt / MWNTs catalyst. figure 2 It is the transmission electron microscope photo of the catalyst and the particle size distribution diagram of the noble metal. It can be seen from the figure that the active components of the noble metal are ...

Embodiment 3

[0046] Weigh 1g of carbon nanotubes (outer diameter 30-50nm, length 10-20μm, specific surface area 80m 2 / g) was added to a mixture of 25ml of concentrated sulfuric acid and 25ml of concentrated nitric acid, ultrasonically dispersed for 30min, then refluxed at 120°C for 3h under stirring, washed and filtered, washed with water until the pH value of the filtrate was neutral, and dried at 120°C for 12h. A pretreated carbon nanotube carrier is obtained. The thermogravimetric curves of the carbon nanotubes before and after treatment are respectively figure 1 e and figure 1 d, By comparison, it can be seen that before pretreatment, the temperature at which MWCNTs begin to lose weight is about 500 °C, and after pretreatment, this temperature rises to 550 °C, that is, the thermal stability of MWCNTs is significantly enhanced after acid treatment. This is because the raw material MWCNTs has amorphous carbon on the surface and catalyst residues in the tube, both of which will reduce ...

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Abstract

The invention provides a carbon nanotube-supported catalyst applicable to an oxidizing atmosphere and a preparation method thereof. The catalyst uses carbon nanotubes (WCNTs) as a carrier, and two precious metals, i.e., palladium and platinum, as active components; palladium and platinum particles are uniformly dispersed on the surfaces of the carbon nanotubes; the precious metals account for 0.1to 2 wt% of the total weight of the catalyst; and the particle sizes of the precious metal particles are in a range of 2 to 5 nm. The method of the invention comprises the following steps: pretreatingthe carbon nanotubes at first; and then preparing a noble metal Pd-Pt / MWNTs catalyst precursor by using an equivalent-volume impregnation or deposition-precipitation process. The catalyst prepared byusing the method has the advantages of high activity, good hydrothermal stability, poison resistance, etc., and can be used for catalytic combustion of low-concentration methane in an oxidizing atmosphere and for efficient removal of other hydrocarbons and VOC gases.

Description

technical field [0001] The invention belongs to the technical field of energy utilization and environmental protection, and in particular relates to a carbon nanotube-loaded catalyst used in an oxidizing atmosphere and a preparation method thereof. Background technique [0002] With the improvement of environmental awareness and pollutant discharge indicators, ventilation gas (CH 4 Concentration <1%), the emissions of hydrocarbons and VOCs in vehicle exhaust not only cause waste of resources, but also bring serious greenhouse effect and damage to the ecological environment. Catalytic combustion is considered to be the most effective way to solve this problem. [0003] Ventilation gas, automobile exhaust, and organic waste gas will produce a large amount of water vapor during the combustion reaction, and the reactants contain a small amount of impurities such as sulfur, phosphorus, and halogen. Therefore, catalytic combustion catalysts are required to have high activity a...

Claims

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Application Information

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IPC IPC(8): B01J23/44F23C13/08F23G7/07
CPCB01J23/44F23C13/08F23G7/07Y02E20/34
Inventor 王胜高典楠王树东汪明哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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