Carbon nanotube supported palladium catalyst used for methane catalysis combustion, and preparation method and application thereof

A methane catalytic combustion, carbon nanotube technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, fuels, etc., to improve dispersion and stability, strong adsorption, good activity and hydrothermal stability

Inactive Publication Date: 2014-08-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of carbon nanotubes in catalytic combustion is rarely reported.

Method used

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  • Carbon nanotube supported palladium catalyst used for methane catalysis combustion, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 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 acid with a concentration of 3.37mgPd / ml, add the pretreated carbon nanotube carrier, stir evenly, then dry at 60°C for 24h, and then roast the dried product at 500°C for 2h to obtain 1wt%Pd / MWNTs catalyst.

Embodiment 2

[0036] 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 acetone solution of chloropalladium acid with a concentration of 20.83mgPd / ml, add the pretreated carbon nanotube carrier, stir evenly, then dry at 80°C for 20h, and then roast the dried product at 200°C for 4h to obtain 4wt%Pd / MWNTs catalyst.

Embodiment 3

[0038] Weigh 1g of carbon nanotubes (outer diameter 30~50nm, length 10~20μm, specific surface area 80m 2 / g) was added to the mixture of 25ml concentrated sulfuric acid and 25ml 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. Measure 5ml of an aqueous solution of chloropalladium acid with a concentration of 4.08mgPd / ml, add the pretreated carbon nanotube carrier, stir evenly, then dry at 50°C for 36h, and then roast the dried product at 400°C for 2h to obtain 2wt %Pd / MWNTs catalyst.

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Abstract

The invention relates to a carbon nanotube supported palladium catalyst (Pd/MWNTs) used for methane catalysis combustion, and a preparation method and an application thereof. The catalyst uses carbon nanotubes as a carrier and palladium as an active component, and palladium particles are uniformly dispersed on the surface of the carbon nanotubes; and the content of palladium accounts for 0.1-5% of the total weight of the catalyst, and the particle size of the palladium particles is 2-5nm. The method comprises the following steps: pre-treating the carbon nanotubes, and preparing a Pd/MWNTs catalyst precursor by using an isopyknic immersion process or a deposition-precipitation process. The catalyst prepared by adopting the method has the advantages of high activity, good hydrothermal stability, toxin immunity and the like, can be used in the methane catalysis combustion process, and can also be used in the efficient removal utilization process of other 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-supported palladium catalyst for catalytic combustion of methane, its preparation and application. Background technique [0002] With the improvement of environmental awareness and pollutant emission indicators, natural gas is considered to be one of the cleanest energy sources due to its abundant reserves, low price, high thermal efficiency, and low pollution. The main component of natural gas is methane. Compared with other organic compounds, methane is difficult to activate, especially when the concentration of methane is low, such as coal mine ventilation gas (concentration <1%). my country emits a large amount of methane gas into the atmosphere every year during the coal mining process, which not only causes waste of resources, but also brings serious greenhouse effect and damage to the ecological envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44C10L3/10
CPCY02A50/20
Inventor 王树东高典楠王胜汪明哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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