Dichloromethane catalyst and preparation method thereof

A dichloromethane and catalyst technology, applied in the field of dichloromethane catalyst and preparation thereof, can solve the problems of long time consumption, high condition requirements and high cost, and achieve the effects of low cost, simple preparation method and excellent catalytic activity

Active Publication Date: 2019-09-27
湖南明瑞环保科技有限公司
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Problems solved by technology

Patent CN201510369031 provides a dichloromethane catalytic nano-membrane and its preparation method, using Chlorophytum extract mixed with other organic matter, the preparation time is longer and the conditions are higher; patent CN201811329267 prepared a transition metal oxide catalyst catalytic combustion Dichloromethane, when the slurry is synthesized, it needs t

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  • Dichloromethane catalyst and preparation method thereof

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[0030] For realizing above-mentioned object, the present invention also provides a kind of preparation method of dichloromethane catalyst, comprises the following steps:

[0031] Step 1, preparation of transparent aluminum sol; prepare 5-25wt% pseudo-boehmite solution, add HNO3 to adjust pH=2-4, continue stirring and dissolving for 1-3 hours to obtain transparent aluminum sol; or prepare aluminum hydroxide React with phosphoric acid aqueous solution in an oil bath at 70-90°C for 1-3h under stirring. As the reaction proceeds, a transparent sol is gradually obtained from the turbid solution; the mass fraction of the phosphoric acid aqueous solution is 30-65wt%, hydrogen The molar ratio of alumina to phosphoric acid molecules = 1: (1-5); the oil bath here is a heating method, which conducts heat through heat conduction oil, that is, the condition of 70-90 ° C is that the container containing the solution is placed in the oil bath The pot is realized by oil heat conduction; if the...

Embodiment 1

[0042] 1) Weigh 7.5g pseudo-boehmite, add 45g water, add HNO while stirring 3 Adjust pH=3, add 3.5g alumina powder and continue stirring for 3h.

[0043] 2) Take 25cm 3 Cordierite honeycomb ceramics were soaked in the above solution for 5 minutes, then taken out, blown off the excess liquid with an air gun, and baked in a muffle furnace at 450°C for 3 hours.

[0044] 3) Weigh 0.3g of phosphomolybdic acid and 3.0g of chromium nitrate respectively, add them into 75g of water, stir and dissolve for 1 hour.

[0045] 4) Immerse the honeycomb ceramic obtained in 2) into the solution for 5 minutes, take it out, blow off excess liquid with an air gun, put it into a muffle furnace and bake at 500° C. for 3 hours to obtain a molded catalyst.

Embodiment 2

[0047] 1) Weigh 5.5g pseudo-boehmite, add 45g water, add HNO while stirring 3 Adjust pH=3, add 4.5g alumina powder and continue stirring for 3h.

[0048] 2) Take 25cm 3 Cordierite honeycomb ceramics were soaked in the above solution for 5 minutes, then taken out, blown off the excess liquid with an air gun, and baked in a muffle furnace at 450°C for 3 hours.

[0049] 3) Weigh 0.6g of sodium tungstate, 2.5g of chromium nitrate, and 0.3g of chromium oxide respectively, add them into 65g of water, stir and dissolve for 1 hour.

[0050] 4) Immerse the honeycomb ceramic obtained in 2) into the solution for 5 minutes, take it out, blow off excess liquid with an air gun, put it into a muffle furnace and bake at 500° C. for 3 hours to obtain a molded catalyst.

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Abstract

The invention discloses a dichloromethane catalyst and a preparation method thereof. The dichloromethane catalyst comprises an alumina coating and a porous substrate; the surface of the porous substrate is coated with the alumina coating; a composite oxide precursor salt solution is impregnated on the porous substrate coated with the alumina coating, and then roasted to form the dichloromethane catalyst; the catalyst is prepared under normal pressure conditions; the solidly bonded alumina coating is prepared from alumina sol; composite oxide with catalytic activity can be formed through impregnating and then roasting the composite oxide precursor salt solution. The preparation method of a solution is simple, only needs the processes of impregnation and roasting, and is suitable for industrial large-scale production and application; the composite oxide formed after roasting of the selected specific composite oxide precursor salt solution has excellent catalytic activity on dichloromethane, and the catalytic conversion rate at 380 DEG C can reach 95% or above.

Description

technical field [0001] The invention relates to the technical field of environmental protection catalysts, in particular to a dichloromethane catalyst and a preparation method thereof. Background technique [0002] Catalytic combustion technology is a major technology for treating VOCs waste gas today. One of its cores is the catalyst, which can significantly reduce the activation energy required for the reaction, making catalytic combustion technology more effective in improving energy utilization efficiency, reducing energy consumption and controlling harmful gas emissions. play an increasingly prominent role. [0003] Dichloromethane (CH 2 Cl 2 ) is widely used in film production and medicine, and is a potential carcinogen to humans. When in contact with open flames or hot objects, highly toxic phosgene can be produced, which has a destructive effect on the environment. It is necessary to treat the waste gas containing methylene chloride. [0004] Dichloromethane wast...

Claims

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Application Information

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IPC IPC(8): B01J27/19B01J23/30B01J29/48
CPCB01J27/19B01J23/30B01J29/48B01J23/002B01J2523/00B01J2523/31B01J2523/67B01J2523/69
Inventor 邱雁强汪文珍姚吉豪
Owner 湖南明瑞环保科技有限公司
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