Silicon carbide modified catalyst used for microwave-heating catalytic oxidization of VOCs and preparation method thereof

A technology of catalytic oxidation and microwave heating, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problem of high complete conversion temperature, improve catalytic activity, facilitate engineering applications, and reduce costs.

Active Publication Date: 2018-04-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that CeO 2 Has excellent low-temperature activity, but high complete conversion temperature

Method used

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  • Silicon carbide modified catalyst used for microwave-heating catalytic oxidization of VOCs and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 30gAl(NO 3 ) 3 9H 2 O was dissolved in 150ml of deionized water; 0.122g of SiC powder was added to the solution and mixed evenly (calculated based on the silicon carbide doping ratio in the composite carrier being 3%); the mixed solution was placed on a magnetic stirrer and added drop by drop under strong stirring Ammonia water, adjust the pH value to about 10; put the mixed solution in a constant temperature water bath at 60°C for 30 minutes; let the mixed solution stand for 12 hours, remove the supernatant, and dry the lower sediment at 105°C for 24 hours; transfer the dried solid Place in the crucible in a temperature-programmed muffle furnace, control the heating rate of 10°C / min, and roast at the end temperature of 550°C for 1h, and naturally cool to room temperature; the obtained solid can be properly ground to obtain 3% SiC-Al 2 o 3 Composite carrier. 0.9056gCo(NO 3 ) 3 ·6H 2 O and 0.3154gCe(NO 3 ) 3 ·6H 2 O (calculated at 5% Co loading and 2.5% C...

Embodiment 2

[0044] Weigh 30gAl(NO 3 ) 3 9H 2 O was dissolved in an appropriate amount of laboratory-made deionized water, stirred and dissolved; 0.204g of SiC powder was added to the solution and mixed evenly (the doping ratio of silicon carbide in the composite carrier was 5%); the mixed solution was placed on a magnetic stirrer and stirred vigorously. Add ammonia water drop by drop to adjust the pH value to about 10; put the mixed solution in a constant temperature water bath at 60°C for 30 minutes; let the mixed solution stand for 12 hours, remove the supernatant, and dry the lower sediment at 105°C for 24 hours; The final solid was transferred to a crucible and placed in a temperature-programmed muffle furnace, set to raise the temperature to 550° C. for 1 h, and roasted at this temperature for 1 h, and cooled naturally to room temperature. 0.9056gCo(NO 3 ) 3 ·6H 2 O and 0.3154gCe(NO 3 ) 3 ·6H 2 O was dissolved in 50ml deionized water; weigh 5g of the prepared 5% SiC-Al 2 o ...

Embodiment 3

[0047] Weigh 30gAl(NO 3 ) 3 9H 2 O was dissolved in an appropriate amount of laboratory-made deionized water, stirred and dissolved; 0.408g of SiC powder was added to the solution and mixed evenly (the doping ratio of silicon carbide in the composite carrier was 10%); the mixed solution was placed on a magnetic stirrer and stirred vigorously. Add ammonia water drop by drop to adjust the pH value to about 10; put the mixed solution in a constant temperature water bath at 60°C for 30 minutes; let the mixed solution stand for 12 hours, remove the supernatant, and dry the lower sediment at 105°C for 24 hours; The final solid was transferred to a crucible and placed in a temperature-programmed muffle furnace, set to raise the temperature to 550° C. for 1 h, and roasted at this temperature for 1 h, and cooled naturally to room temperature. 0.9056gCo(NO 3 ) 3 ·6H 2 O and 0.3154gCe(NO 3 ) 3 ·6H 2 O was dissolved in 50ml deionized water; weigh 5g of the prepared 5% SiC-Al 2 o ...

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Abstract

The invention belongs to the field of inorganic catalytic materials and relates to a silicon carbide modified catalyst used for catalytically oxidizing methylbenzene under microwave-heating conditionand a preparation method of the catalyst. The preparation method includes the steps of doping a supporter with SiC and supporting an active component additive CeO2 on the modified supporter through coprecipitation. The catalyst can change the binding mode between the SiC and the catalyst, so that the catalyst is quicker and more uniform to heat, thereby significantly reducing catalytic oxidizing temperature and improving efficiency. The method reduces usage amount of the SiC and saves cost. The catalyst is sintering resistant and is easy to regenerate. The raw materials are easy to obtain andthe preparation method is simple. The technical process is easy to carry out, so that the catalyst has advantages on engineering application.

Description

technical field [0001] The invention relates to a catalyst for degrading VOCs modified by silicon carbide and a preparation method thereof, belonging to the field of inorganic catalytic materials. Background technique [0002] With the acceleration of economic construction and the rapid development of industrial enterprises, the emission of volatile organic compounds (VOCs) is increasing day by day, which seriously threatens public health and the living environment. At present, catalytic oxidation is one of the mainstream technologies for VOCs exhaust gas treatment technology. The most commonly used heating method is electric heating to make the reaction temperature reach 200-450°C. When the ordinary tube furnace heats the reaction, the heat energy spreads from the surface to the inside, resulting in uneven heating of the sample; the heat released is too late to dissipate, causing the catalyst components to sinter and agglomerate, changing the catalyst pore structure, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01D53/86B01D53/44
CPCB01D53/8687B01D2257/708B01D2258/02B01D2259/806B01J27/224B01J35/023
Inventor 胡将军刘芬
Owner WUHAN UNIV
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