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Second main group element modified cobalt-aluminum catalyst as well as preparation method and application thereof

A technology of main group elements and catalysts, applied in the field of cobalt-aluminum catalysts modified by second main group elements and its preparation, can solve the problems of producing chloroform, carbon tetrachloride, etc., to promote catalyst activity, increase activity, inhibit The effect of by-products

Inactive Publication Date: 2020-12-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects of the prior art, the present invention provides a cobalt-aluminum composite oxide catalyst modified with elements of the second main group as a precursor, and obtained by roasting cobalt-aluminum composite oxide catalysts modified with elements of the second main group, thereby solving the problem of Problems such as chloroform and carbon tetrachloride are produced during catalytic combustion

Method used

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  • Second main group element modified cobalt-aluminum catalyst as well as preparation method and application thereof
  • Second main group element modified cobalt-aluminum catalyst as well as preparation method and application thereof
  • Second main group element modified cobalt-aluminum catalyst as well as preparation method and application thereof

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Effect test

Embodiment 1

[0036] A cobalt-aluminum catalyst modified by the second main group element is prepared according to the following steps:

[0037] (1) Dissolve 8.73g of cobalt nitrate hexahydrate, 3.85g of magnesium nitrate, and 5.63g of aluminum nitrate in 50mL of deionized water, stir to form a salt solution, and dissolve 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, Stir to form an alkaline solution, quickly add the alkaline solution to the salt solution and mix evenly to obtain a suspension;

[0038] (2) Stirring and heating the suspension in an oil bath at 80°C for 24 hours, suctioning and washing after natural cooling, to obtain cobalt-aluminum hydrotalcite modified with the second main group element;

[0039] (3) Cobalt aluminum hydrotalcite was baked in an oven at 110°C for 24 hours, and then baked at 500°C for 4 hours to obtain Co 2 MgAlO x Catalyst, where x represents the indeterminate amount of O in the final catalyst, and finally exists in the ...

Embodiment 2

[0041] The main difference between this embodiment and embodiment 1 is that the second main group elements are different, as described below;

[0042] A cobalt-aluminum catalyst modified by the second main group element is prepared according to the following steps:

[0043] (1) Dissolve 8.73g of cobalt nitrate hexahydrate, 3.54g of calcium nitrate, and 5.63g of aluminum nitrate in 50mL of deionized water, stir to form a salt solution, and dissolve 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, Stir to form an alkaline solution, quickly add the alkaline solution to the salt solution and mix evenly to obtain a suspension;

[0044] (2) Stirring and heating the suspension in an oil bath at 80°C for 24 hours, suctioning and washing after natural cooling, to obtain cobalt-aluminum hydrotalcite modified with the second main group element;

[0045](3) Cobalt aluminum hydrotalcite was baked in an oven at 110°C for 24 hours, and then baked at 500°C for...

Embodiment 3

[0047] The main difference between this embodiment and embodiment 1 is that the second main group elements are different, as described below;

[0048] A cobalt-aluminum catalyst modified by the second main group element is prepared according to the following steps:

[0049] (1) Dissolve 8.73g of cobalt nitrate hexahydrate, 3.17g of strontium nitrate, and 5.63g of aluminum nitrate in 50mL of deionized water, stir to form a salt solution, and dissolve 3.84g of sodium hydroxide and 3.18g of carbonic acid in 50mL of deionized water, Stir to form an alkaline solution, quickly add the alkaline solution to the salt solution and mix evenly to obtain a suspension;

[0050] (2) Stirring and heating the suspension in an oil bath at 80°C for 24 hours, suctioning and washing after natural cooling, to obtain cobalt-aluminum hydrotalcite modified with the second main group element;

[0051] (3) Cobalt aluminum hydrotalcite was baked in an oven at 110°C for 24 hours, and then baked at 500°C ...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a second main group element modified cobalt-aluminum catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving a cobalt salt, a second main group element salt and an aluminum salt, and uniformly mixing to obtain a turbid liquid; (2) crystallizing the turbid liquid to obtain second main group element modified cobalt-aluminum hydrotalcite; and (3) calcining the obtained second main group element modified cobalt-aluminum hydrotalcite to obtain the catalyst. The cobalt-aluminum hydrotalcite modified by the second main group element is used as the precursor, so that the defects of trichloromethane, carbon tetrachloride and the like generated when the cobalt-aluminum hydrotalcite derived composite oxide is used for catalytic combustion of dichloromethane can be effectively controlled, the catalytic activity and stability on catalytic combustion of dichloromethane are very high, the initiation temperature is low, and the catalytic efficiency is high. The full conversion temperature is low.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and more specifically relates to a cobalt-aluminum catalyst modified with elements of the second main group and its preparation method and application. Background technique [0002] Chlorinated Volatile Organic Compounds (CVOCs, Chlorinated Volatile Organic Compounds) emitted in various industrial processes can be roughly divided into aromatic hydrocarbon chlorides, such as chlorobenzene, dichlorobenzene; chlorinated aliphatic hydrocarbons, such as vinyl chloride, Unsaturated chlorinated aliphatic hydrocarbons such as trichlorethylene and saturated chlorinated aliphatic hydrocarbons such as dichloromethane and dichloroethane. Among various chlorine-containing organic compounds, dichloromethane seriously endangers the environment and human health due to its anesthesia effect and triple effects of genetic toxicity (mutagenic-carcinogenic-teratogenic). The catalysts used for the catalytic combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J23/75B01J35/10F23G7/07
CPCB01J23/78B01J23/002F23G7/07B01J2523/00B01J35/61B01J2523/22B01J2523/31B01J2523/845B01J2523/23B01J2523/24B01J2523/25
Inventor 郭利民邓威张龙汤倩茜
Owner HUAZHONG UNIV OF SCI & TECH
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