Method for preparing spherical shell type catalyst for catalytic combustion of VOCs (volatile organic compounds)

A catalytic combustion and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Problems such as secondary pollution of products and high toxicity of organic waste gas are achieved to overcome the effects of easy poisoning, good adsorption and good dispersibility

Active Publication Date: 2013-11-13
JIANGSU ANQIER WASTE GAS PURIFICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic waste gas containing benzene series is highly toxic. If the waste gas is directly discharged into the atmosphere, it will cause serious pollution to the environment and endanger human health.
Traditional benzene series treatment methods include adsorption method, condensation method, direct combustion method, etc., but these methods are not thorough enough to easily generate intermediate products and cause secondary pollution. Conditions such as gas concentration, temperature, etc., and the direct combustion method may explode, and the safety is not high

Method used

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  • Method for preparing spherical shell type catalyst for catalytic combustion of VOCs (volatile organic compounds)
  • Method for preparing spherical shell type catalyst for catalytic combustion of VOCs (volatile organic compounds)
  • Method for preparing spherical shell type catalyst for catalytic combustion of VOCs (volatile organic compounds)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 0.6mmol Ce (NO 3 ) 3 ·6H 2 O and 0.9mmol urea were dissolved in 60mL of deionized water, and after fully stirring, the mixture was poured into a polytetrafluoroethylene-lined hydrothermal kettle, and microwave hydrothermal heating was carried out in a microwave digestion instrument, with a programmed heating rate of 70°C / min. , the final temperature was 170°C and kept for 30 minutes.

[0026] (2) After cooling, the obtained precipitate was washed 3 times with absolute ethanol and then with deionized water 3 times, dried at 80°C for 6h, and calcined at 500°C for 2h to obtain spherical shell CeO 2 .

[0027] (3) Take 0.5g of the above-mentioned spherical shell CeO 2 powder, dissolved in 40mL deionized water, added 0.25mL H 2 PtCl 6 · 6H 2 O solution (10 mg Pt / mL) and 0.0502 g CuSO 4 mix,

[0028] (4) After stirring for 12 hours, filter, the obtained precipitate was washed with deionized water for 3 times, dried at 100°C for 20 hours, and then calcined at...

Embodiment 2

[0032] (1) Take 0.6mmol Ce (NO 3 ) 3 ·6H 2 O and 1.1mmol urea were dissolved in 60mL of deionized water. After fully stirring, the mixture was poured into a polytetrafluoroethylene-lined hydrothermal kettle. Microwave hydrothermal heating was carried out in a microwave digestion apparatus, and the programmed heating rate was set at 70°C / min. , and the final temperature was 160°C and kept for 30 minutes.

[0033] (2) After cooling, the obtained precipitate was washed with absolute ethanol for 3 times and then with deionized water for 3 times, dried at 60°C for 10 hours, and then calcined at 500°C for 2 hours to obtain spherical shell CeO 2 .

[0034] (3) Take 0.5g of the above-mentioned spherical shell CeO 2 powder, dissolved in 40mL deionized water, added 0.175mL [Pt(NH 3 ) 4 ](NO 3 ) 2 solution (10mg Pt / mL) and 0.1519g Cu(NO 3 ) 2 ·3H 2 O mix.

[0035] (4) After stirring for 15 hours, filter, the resulting precipitate was washed with deionized water for 3 times,...

Embodiment 3

[0039] (1) Take 0.6mmol Ce (NO 3 ) 3 ·6H 2 O and 1.2mmol urea were dissolved in 60mL of deionized water, and after fully stirring, the mixture was poured into a polytetrafluoroethylene-lined hydrothermal kettle, and microwave hydrothermal heating was carried out in a microwave digestion instrument, with a programmed heating rate of 70°C / min. , and the final temperature was 180°C and kept for 30 minutes.

[0040] (2) After cooling, the obtained precipitate was washed 3 times with absolute ethanol and then with deionized water 3 times, dried at 70°C for 8h, and calcined at 500°C for 2h to obtain spherical shell CeO 2 .

[0041] (3) Take 0.5g of the above-mentioned spherical shell CeO 2 powder, dissolved in 40mL deionized water, added 0.125mL H 2 PtCl 6 · 6H 2 O solution (10 mg Pt / mL) and 0.0803 g CuSO 4 mix.

[0042] (4) After stirring for 10 hours, filter, the obtained precipitate was washed with deionized water for 3 times, dried at 110°C for 18 hours, and then calcin...

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Abstract

The invention relates to the technical fields of a chemical catalyst and preparation thereof, particularly to a method for preparing a spherical shell type catalyst for catalytic combustion of VOCs (volatile organic compounds). The method comprises the steps of: dissolving a cerium-containing compound and urea in deionized water to obtain a solution, thoroughly stirring and pouring the solution into a hydrothermal kettle and carrying out microwave hydrothermal treatment; cooling to obtain a sediment; washing, drying and calcining the sediment; dissolving spherical shell type CeO2 powder in a mixed solution of a platinum-containing compound and a copper-containing compound, stirring and filtering to obtain a sediment; washing, drying and calcining the sediment to obtain the powdered spherical shell type catalyst Pt / CuO-CeO2. The catalyst prepared by the method has a good dispersibility, a unique spherical shell type appearance and a large specific surface area, so that pollutants can be attached to the surface of the catalyst favorably; besides, a large quantity of active sites can be provided; by the combination of noble metal and rare earth elements, the defects such as easy toxication and incapability of resisting high temperature are effectively overcome. The catalyst has very high catalytic activity to the catalytic combustion reaction of benzene series materials such as methyl benzene; in addition, raw materials for preparation are easy to obtain and the technology is simple.

Description

technical field [0001] The invention relates to a spherical shell type Pt / CuO-CeO catalytic combustion of volatile organic compounds 2 The preparation method of the catalyst belongs to the technical field of chemical catalyst and its preparation. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs), according to the definition of the World Health Organization, are compounds with a boiling point between 50°C and 250°C. The saturated vapor pressure at room temperature exceeds 133.32Pa, and they exist in the air in the form of vapor at room temperature. organic matter. The main components of VOCs are: hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbons and nitrogen hydrocarbons, which include: benzene series, organic chlorides, Freon series, organic ketones, amines, alcohols, ethers, esters, acids and petroleum hydrocarbon compounds Wait. The sources of VOCs are mainly industrial waste gas from fuel combustion and transportation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10B01D53/44B01D53/86
Inventor 赵伟荣曾婉昀
Owner JIANGSU ANQIER WASTE GAS PURIFICATION
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