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Composite catalyst capable of being used for low-temperature organic pollutant oxidization and preparation method thereof

A composite catalyst and organic pollutant technology, which is applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of high active window temperature, complex process and high cost and other problems, to achieve the effect of reducing T50 temperature, enriching pore structure, and wide application range

Inactive Publication Date: 2012-01-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to improve the shortcomings of existing catalysts for removing organic pollutants in exhaust gas, such as high active window temperature, toxicity, complicated process, high cost, etc., and provide a composite catalyst with low active window temperature and high cost performance. Not only can it be used for low-temperature oxidation of organic pollutants in waste gas, it also has a good catalytic effect on organic pollutants in waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 0.041g of chloroauric acid in 200mL of deionized water, keep the temperature in a water bath at 20°C and adjust the pH value to 9 with 4.0M ammonia solution, and disperse the solution after sodium hexametaphosphate (the mass ratio of sodium hexametaphosphate to attapulgite is 1%), cetyltrimethylammonium bromide CTAB (0.5g / 100mL) surface-modified attapulgite 1.307g slowly added to the mixed solution, heated to 60 ° C and magnetic stirring, with 4.0M The ammonia solution was used to adjust the pH value to 9 and keep it warm for 60 min. Take it out, wash it twice with deionized water, dry it in an oven at 80°C for 12h, then calcinate it at 300°C for 2h, and grind the product to obtain a composite catalyst.

[0032] Catalytic conditions: total gas flow rate 240mL / min, o-dichlorobenzene volume content 3%, space velocity 30000h -1 .

[0033] Catalytic effect: the removal rate of p-dichlorobenzene at room temperature is 90%; and two literatures of Kyeong et al., Ind...

Embodiment 2

[0035] Dissolve 0.082g of chloroauric acid in 200mL of deionized water, keep the temperature in a water bath at 20°C and adjust the pH value to 10 with 4.0M ammonia solution. Add 3.921 g of attapulgite attapulgite slowly into the mixed solution, raise the temperature to 60° C. and stir it magnetically, adjust the pH value to 10 with 4.0 M ammonia solution and keep it warm for 60 minutes. Take it out, wash it until no chloride ion is detected, dry it in an oven at 80°C for 18 hours, then calcinate it at 300°C for 2 hours, and grind the product to obtain a composite catalyst.

[0036] Catalytic condition: with embodiment 1.

[0037] Catalytic effect: The removal rate of p-dichlorobenzene at room temperature is 99%.

Embodiment 3

[0039] Dissolve 0.123g of chloroauric acid in 200mL of deionized water, keep the temperature in a water bath at 20°C and adjust the pH value to 11 with 4.0M aqueous ammonia solution, and then 11.763 g of attapulgite after surface modification with ammonium chloride was slowly added into the mixed solution, the temperature was raised to 60° C. and magnetically stirred, and the pH value was adjusted to 11 with 4.0 M ammonia solution and kept for 60 min. Take it out, wash it until no chloride ion is detected, dry it in an oven at 80°C for 24 hours, then calcinate it at 300°C for 2 hours, and grind the product to obtain a composite catalyst.

[0040] Catalytic condition: with embodiment 1.

[0041] Catalytic effect: The removal rate of p-dichlorobenzene is 94% at room temperature.

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Abstract

The invention relates to a composite catalyst capable of being used for low-temperature organic pollutant oxidization and a preparation method thereof. The catalyst is prepared by using dispersed and cation surface modifier modified attapulgite as catalyst carriers to be loaded with nanometer gold as catalyst active ingredients, wherein the nanometer gold accounts for 0.5 to 1.5 percent of the mass of the attapulgite, the attapulgite has the average diameter being 18 to 22nm and the length being 100 to 1000nm, and the nanometer gold has the grain diameter being 1 to 7nm. The invention also provides the preparation method of the catalyst. The defects of high active window temperature, toxicity, process complexity, high cost and the like of the existing catalyst for removing organic pollutants in waste gas are overcome, the composite catalyst with the low active window temperature and high cost performance is provided, and the composite catalyst can be used for the low-temperature oxidization of organic pollutants in the waste gas and also has a good catalysis effect on the organic pollutants in waste liquid.

Description

technical field [0001] The invention belongs to the fields of pollution control technology and environmental protection catalytic materials, and in particular relates to a catalyst which can be used for oxidation and removal of organic pollutants in waste gas and waste liquid and a preparation method thereof. Background technique [0002] At present, the catalysts reported at home and abroad for the degradation of organic pollutants in exhaust gas mainly use vanadium pentoxide as the active component V 2 o 5 / TiO 2 system. However, the wide application of this type of catalyst faces several limiting factors: on the one hand, the window temperature of this type of catalyst is 200-500 ° C, and there is almost no activity at low temperature (that is, within 100 ° C); on the other hand, it is necessary to prepare a uniformly distributed V 2 o 5 Particle difficulty is high; again, as a catalytically active substance, V 2 o 5 Is a highly toxic substance, it can also cause h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01D53/86B01D53/70C02F1/72C02F101/38
CPCB01J37/0201B01D2255/2047B01D2255/40B01D2257/206B01J37/0036B01D53/8662B01J37/0207B01J35/006B01J21/16B01J37/08B01D2255/30B01J37/0018B01J35/0013B01J23/52B01D2255/106B01J37/06B01J35/023B01J35/393B01J35/45B01J35/23B01J35/40
Inventor 杨华明何羲欧阳静唐爱东
Owner CENT SOUTH UNIV
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