Supported catalyst and preparation method thereof

A supported catalyst and carrier technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low rate and low catalytic performance, shorten the action distance, and improve metal dispersion. , good synergistic effect

Active Publication Date: 2019-07-05
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic performance of the supported catalysts currently used in the room temperature catalytic oxidation method is not high, and the rate of mineralization of formaldehyde into carbon dioxide and water at room temperature is still low.

Method used

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  • Supported catalyst and preparation method thereof
  • Supported catalyst and preparation method thereof
  • Supported catalyst and preparation method thereof

Examples

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preparation example Construction

[0029] A method for preparing a supported catalyst according to an embodiment of the present invention includes the following steps: mixing a solution containing noble metal ions with indium oxyhydroxide and adding a reducing agent for reduction reaction to obtain the above-mentioned supported catalyst.

[0030] In one specific example, the reducing agents are sodium borohydride and sodium hydroxide. Optionally, the reducing agent is a mixed solution of sodium borohydride and sodium hydroxide, wherein the concentrations of sodium borohydride and sodium hydroxide are both 0.1mol / L to 0.2mol / L, and the concentration of the solution containing noble metal ions is 1mmol / L L~5mmol / L, the reduction reaction time is 30min~60min. It can be understood that the selection of the reducing agent is not limited thereto, and other reducing agents capable of reducing Pt ions can be selected as required.

[0031] Optionally, when the noble metal is platinum, the solute in the solution contain...

Embodiment 1

[0042] Weigh 0.7g of indium chloride tetrahydrate and disperse it in 12mL of deionized water, add concentrated hydrochloric acid drop by drop under vigorous stirring to dissolve completely, then add 2g of sodium acetate trihydrate and 48mL of ethylene glycol, continue stirring for 1 hour, and then put In the vinyl fluoride reaction kettle, heat it in an oven to 200°C and keep it warm for 24h, cool to room temperature with the oven, pour out the solution from the reaction kettle, wash the obtained product with deionized water and ethanol three times alternately, and place the sample in a 60°C oven drying in medium to obtain carrier indium oxyhydroxide. Weigh 1g of indium oxyhydroxide and add 26mL of chloroplatinic acid solution with a concentration of 2mmol / L and stir for 30min, then add 4mL of a mixture of sodium borohydride and sodium hydroxide with a concentration of 0.1mol / L, and continue stirring for 60min to dissolve the product Washed six times with water and dried in an...

Embodiment 2

[0045] Weigh 0.9g of indium nitrate monohydrate and disperse it in 12mL of deionized water, add concentrated nitric acid drop by drop under vigorous stirring to dissolve completely, then add 2.5g of sodium acetate trihydrate and 60mL of ethyl acetate, continue stirring for 1h, and then put In a vinyl fluoride reaction kettle, heat it in an oven to 180°C and keep it warm for 48 hours, then cool it to room temperature with the oven, pour out the solution from the reaction kettle, wash the obtained product three times alternately with deionized water and ethanol, and place the sample in a 60°C oven drying in medium to obtain carrier indium oxyhydroxide. Weigh 1g of indium oxyhydroxide and add 26mL of chloroplatinic acid solution with a concentration of 1mmol / L and stir for 30min, then add 2mL of a mixture of sodium borohydride and sodium hydroxide with a concentration of 0.2mol / L, and continue to stir for 30min to dissolve the product Washed six times with water and dried in an o...

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Abstract

The invention relates to a supported catalyst and a preparation method thereof. The supported catalyst comprises a carrier and an active component loaded on the carrier. The carrier is hydroxyl indiumoxide, and the active component is precious metals. Hydroxyl indium oxide is taken as the carrier and is rich in hydroxyl groups, which can be used as growth anchorage points for precious metal nanoparticles that have a small particle size, are highly dispersed, and are tightly adhered on the carrier. Moreover, more adsorption sites are provided for formaldehyde molecules; and through the synergistic effect between hydroxyl indium oxide and precious metals, the degradation of formaldehyde molecules is promoted. The speed constant of formaldehyde mineralization, which is catalyzed by the supported catalyst and generates carbon dioxide and water, is 0.19*10<-2> ppm<-1>.min<-1> and is 3.8 times and 19 times greater than the speed constants of formaldehyde mineralization catalyzed by an indium trioxide supported precious metal catalyst and an indium hydroxide supported precious metal catalyst respectively.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a supported catalyst and a preparation method thereof. Background technique [0002] Formaldehyde is a typical indoor air pollutant, which has been identified as carcinogenic and teratogenic substances by the World Health Organization. Among many methods for removing formaldehyde, such as ventilation, plant absorption, physical adsorption, photocatalytic oxidation, and room temperature catalytic oxidation, room temperature catalytic oxidation has high oxidation efficiency and can completely mineralize formaldehyde into Carbon dioxide and water, no secondary pollution, no additional energy input, mild reaction conditions, and simple and easy operation have attracted much attention and been widely studied. However, the catalytic performance of the supported catalysts currently used in the room temperature catalytic oxidation method is not high, and the rate of mineralization of formaldehy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J37/10B01J37/16B01D53/86B01D53/72
CPCB01J23/62B01J37/10B01J37/16B01D53/8668B01D2258/06
Inventor 许第发许凯强张世英张向超李金维
Owner CHANGSHA UNIVERSITY
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