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Cobaltosic oxide in-situ coated silicon dioxide mesoporous sphere surface loaded noble metal catalyst, and preparation method and application thereof

A noble metal catalyst, cobalt tetroxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic activity and poor stability of methane, and achieve high activity High, low cost, excellent stability

Active Publication Date: 2020-04-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Cobaltosic oxide in-situ coated silicon dioxide mesoporous sphere surface loaded noble metal catalyst, and preparation method and application thereof
  • Cobaltosic oxide in-situ coated silicon dioxide mesoporous sphere surface loaded noble metal catalyst, and preparation method and application thereof
  • Cobaltosic oxide in-situ coated silicon dioxide mesoporous sphere surface loaded noble metal catalyst, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] A preparation method of in-situ coated silica mesoporous spheres with cobalt tetroxide supporting precious metal catalysts includes the following steps:

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

[0063] (2) Weigh 1.0g of SiO containing carbon nitride described in step (1) 2 The microspheres were dissolved in 100 mL of water and stirred uniformly to obtai...

Embodiment 2

[0069] A preparation method of in-situ coated silica mesoporous spheres with cobalt tetroxide and a noble metal catalyst supported on the surface thereof includes the following steps:

[0070] (1) Mix 24mL of absolute ethanol, 1.0mL of ammonia (25wt%) and 80mL of water evenly. After stirring for 10min at 200rpm, add 0.4g of dopamine hydrochloride and 2mL of tetraethyl silicate, the clear solution gradually becomes turbid. After 5 minutes, the solution gradually became black and turbid, and then stirred for 6 hours at a rate of 600 rpm; the precipitate was filtered, washed with deionized water for 3 times, then centrifuged (8000r / min), and then placed in a drying cabinet at 80°C Dry for 2h in the medium, and finally put the product in a tube furnace, bubbling with nitrogen, and calcining at 800℃ for 5h to prepare SiO containing carbon nitride. 2 Microspheres, named NC-SiO 2 ;

[0071] (2) Weigh 1.0 g of SiO containing carbon nitride described in step (1) 2 The microspheres were diss...

Embodiment 3

[0076] A preparation method of in-situ coated silica mesoporous spheres with cobalt tetroxide supporting precious metal catalysts includes the following steps:

[0077] (1) Mix 24mL of absolute ethanol, 1.0mL of ammonia (25wt%) and 80mL of water evenly. After stirring for 10 minutes at 200rpm, add 0.4g of dopamine hydrochloride and 3mL of tetraethyl silicate, the clear solution gradually becomes turbid. After 5 minutes, the solution gradually became black and turbid, and then stirred for 6 hours at a rate of 600 rpm; the precipitate was filtered, washed with deionized water for 3 times, and then centrifuged (8000r / min), and then placed in a drying cabinet at 80°C Dry for 2h in the medium, and finally put the product in a tube furnace, bubbling with nitrogen, and calcining at 800℃ for 6h to prepare SiO containing carbon nitride. 2 Microsphere, named NC-SiO 2 ;

[0078] (2) Weigh 1.0 g of SiO containing carbon nitride described in step (1) 2 The microspheres were dissolved in 100 mL ...

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Abstract

The invention discloses a cobaltosic oxide in-situ coated silicon dioxide mesoporous sphere surface loaded noble metal catalyst, and a preparation method and an application thereof. A large number ofcoordination sites are provided for Pd atoms by utilizing the nitrogen-rich characteristic in mesoporous spheres, so the interaction force between a carrier and Pd NPs is enhanced, the stability of the Pd NPs is improved, and the conversion from PdO to Pd is relieved; and dopamine is introduced in the Pd loading process, so that a loose polydopamine layer is converted into a carbon shell in situ under the nitrogen condition, the surface of the catalyst is covered with the carbon shell, and the advantage of a shell structure is constructed. The method can inhibit the growth of Pd nanoparticlesand Co nanoparticles, enhances the dispersity and the sintering resistance and agglomeration resistance of noble metals, and effectively saves the preparation cost of the catalyst. The conversion rateof methane combustion of the prepared catalyst is close to 95% at a temperature being as low as 280 DEG C, the catalyst has H2O and CO2 resisting capacity, and energy is effectively saved.

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 cobalt tetroxide in-situ coated silica mesoporous spheres, and a preparation method and application thereof. Background technique [0002] my country's energy storage structure is rich in coal, lack of oil and less gas, and rich in coal resources. It is my country's first energy source, accounting for about 70% of the country's total energy production and consumption. Like conventional natural gas, the main component of coal-bed methane coexisting with coal is methane (CH 4 ), is a high-quality clean energy and chemical raw materials. In recent years, under the policy environment of energy saving, emission reduction and severe smog, clean energy, led by natural gas, has received more and more attention and utilization in my country. Due to the greenhouse effect of methane is about CO 2 23 times of that, th...

Claims

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Application Information

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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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