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A kind of tricobalt tetroxide in-situ coated silica mesoporous sphere surface supported noble metal catalyst and its preparation method and application

A noble metal catalyst, cobalt tetroxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of poor stability, low methane catalytic activity, etc. Reduced, low combustion temperature, conducive to large-scale production and preparation

Active Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is a novel high-efficiency catalyst for the catalytic combustion of methane and toluene, which is designed to solve the problems of low catalytic activity and poor stability of supported noble metal catalysts for methane.

Method used

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  • A kind of tricobalt tetroxide in-situ coated silica mesoporous sphere surface supported noble metal catalyst and its preparation method and application
  • A kind of tricobalt tetroxide in-situ coated silica mesoporous sphere surface supported noble metal catalyst and its preparation method and application
  • A kind of tricobalt tetroxide in-situ coated silica mesoporous sphere surface supported noble metal catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0061] A method for preparing a noble metal catalyst supported on the surface of a silica mesoporous sphere coated with tricobalt tetroxide in situ, comprising the following steps:

[0062] (1) Mix 24mL of absolute ethanol, 1.0mL of ammonia water (25wt%) and 80mL of water evenly, stir at 200rpm for 10min, then add 0.4g of dopamine hydrochloride and 1mL of tetraethyl silicate, and the clear solution gradually becomes cloudy , After 5 minutes, the solution gradually turned black and turbid, then stirred for 6 hours, and the rate of the stirred reaction was 600rpm; the precipitate was filtered, washed with deionized water for 3 times, centrifuged (8000r / min), and then dried at 80°C Dry in the oven for 2 hours, and finally place the product in a tube furnace with nitrogen gas and calcinate at 800°C for 4 hours to prepare SiO containing carbon nitride. 2 Microspheres, named NC-SiO 2 ;

[0063] (2) Weigh the SiO containing carbon nitride described in 1.0g step (1) 2 Dissolve the ...

Embodiment 2

[0069] A method for preparing a noble metal catalyst supported on the surface of a silica mesoporous sphere coated with tricobalt tetroxide in situ, comprising the following steps:

[0070] (1) 24mL of absolute ethanol, 1.0mL of ammonia (25wt%) and 80mL of water were uniformly mixed, and after stirring for 10min at 200rpm, 0.4g of dopamine hydrochloride and 2mL of tetraethyl silicate were added, and the clear solution gradually became turbid. After 5 minutes, the solution gradually turned black and turbid, and then stirred for 6 hours at a rate of 600 rpm; filtered to collect the precipitate, washed with deionized water for 3 times, then centrifuged (8000r / min), and then placed in a drying oven at 80°C Dry for 2 hours, and finally place the product in a tube furnace with nitrogen and calcinate at 800°C for 5 hours to prepare SiO containing carbon nitride. 2 Microspheres, named NC-SiO 2 ;

[0071] (2) Weigh the SiO containing carbon nitride described in 1.0g step (1) 2 Disso...

Embodiment 3

[0076] A method for preparing a noble metal catalyst supported on the surface of a silica mesoporous sphere coated with tricobalt tetroxide in situ, comprising the following steps:

[0077] (1) 24mL of absolute ethanol, 1.0mL of ammonia (25wt%) and 80mL of water were evenly mixed, and after stirring for 10min at 200rpm, 0.4g of dopamine hydrochloride and 3mL of tetraethyl silicate were added, and the clear solution gradually became turbid. After 5 minutes, the solution gradually turned black and turbid, and then stirred for 6 hours at a rate of 600 rpm; filtered to collect the precipitate, washed with deionized water for 3 times, then centrifuged (8000r / min), and then placed in a drying oven at 80°C Dry for 2 hours, and finally place the product in a tube furnace with nitrogen and calcine it at 800°C for 6 hours to prepare SiO containing carbon nitride. 2 Microspheres, named NC-SiO 2 ;

[0078] (2) Weigh the SiO containing carbon nitride described in 1.0g step (1) 2 Dissolv...

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Abstract

The invention discloses a noble metal catalyst supported on the surface of mesoporous spheres coated with tricobalt tetroxide in situ, as well as its preparation method and application. The method includes: taking advantage of the nitrogen-rich properties in the mesoporous spheres to provide a large number of coordination sites for Pd atoms, enhancing the interaction force between the carrier and Pd NPs, improving the stability of Pd NPs, and easing the transition from PdO to Pd ; Introduce dopamine in the process of Pd loading, so that the loose polydopamine layer is converted in situ under nitrogen conditions to form a carbon shell, which covers the surface of the catalyst, thereby building the advantage of the shell structure. The method can inhibit the growth of Pd nanoparticles and Co nanoparticles, enhance the dispersion of noble metals and the ability to resist sintering and agglomeration, and effectively save the preparation cost of the catalyst. The catalyst prepared by the present invention has a conversion rate of methane combustion close to 95% at a temperature as low as 280 ° C, and has anti-H 2 O and CO 2 ability to effectively save energy.

Description

technical field [0001] The invention relates to the field of degradation catalysts for methane and toluene, in particular to a noble metal catalyst supported on the surface of mesoporous spheres coated with tricobalt tetroxide in situ and its preparation method and application. Background technique [0002] my country's energy storage structure is rich in coal, short of oil and low in gas, and rich in coal resources. It is my country's primary energy source, accounting for about 70% of the country's total energy production and consumption. Like conventional natural gas, the main component of CBM that coexists with coal is methane (CH 4 ), is a high-quality clean energy and chemical raw material. In recent years, under the policy environment of energy saving, emission reduction and serious smog, clean energy led by natural gas has been paid more and more attention and utilization in my country. Due to the methane greenhouse effect is about CO 2 23 times that of the ozone l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J27/24B01J35/00B01J35/08B01J35/10C10L3/00F23G7/07
CPCB01J27/24B01J23/8913F23G7/07C10L3/003F23G2209/14C10L2290/141B01J35/393B01J35/60B01J35/51B01J35/615
Inventor 叶代启熊菊霞宋凌河
Owner SOUTH CHINA UNIV OF TECH
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