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Preparation method of zirconium manganese doped hexa- aluminate catalyzer

A hexaaluminate and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high price, restrict the development of precious metal catalysts, etc., and achieve low cost, high temperature stability, simple craftsmanship

Inactive Publication Date: 2008-01-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Noble metals have good activity, but they are expensive, which limits the further development of noble metal catalysts
Metal oxide catalysts have higher thermal stability and cheap raw materials, which can be used as a substitute for noble metals. However, metal oxide catalysts are prone to high-temperature solid-state reactions with supports, which limits their use in high-temperature combustion reactions.

Method used

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  • Preparation method of zirconium manganese doped hexa- aluminate catalyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The inverse microemulsion is mixed by 50% cyclohexane, 16% n-butanol, 20% OP-10 emulsifier and 14% water (volume ratio) and then added in a three-necked flask, stirred at a speed of 600 rpm for 10 hours, Let stand for 12 hours. Prepare 0.4mol / L zirconium nitrate solution, 0.6mol / L manganese nitrate solution, and 2mol / L aluminum nitrate solution. Zirconium nitrate: manganese nitrate: aluminum nitrate is 1: 1.5: 10.5 (molar ratio) after mixing, in 80 ℃ of water baths, add dropwise in the inverse microemulsion with the speed of 0.5d / s, the amount of adding polyethylene glycol is 4g, Stop the water bath and stirring, and let stand for 1 to 3 hours. Then drop 3 mol / L urea and 5 mol / L ammonia water in a ratio of 1:2 (volume ratio) into the microemulsion system at a rate of 0.5 d / s in a water bath at 80° C. to produce precipitation until the pH is 8. The precipitate was aged for 24 hours, and the precipitate was filtered out. The precipitate was washed with industrial alcoh...

Embodiment 2

[0015] The inverse microemulsion is added in the there-necked flask after mixing 60% cyclohexane, 20% n-butanol, 20% OP-10 emulsifier and 10% water (volume ratio), and stirred for 10 hours at a speed of 600 rev / min. Let stand for 12 hours. Prepare 0.5mol / L zirconium nitrate solution, 1.0mol / L manganese nitrate solution, and 1.5mol / L aluminum nitrate solution. Zirconium nitrate: manganese nitrate: aluminum nitrate is mixed at 1:2:10 (molar ratio) and then added dropwise to the inverse microemulsion in a constant temperature water bath at 80°C at a rate of 0.5d / s, and the amount of polyethylene glycol added is 3g. Stop the water bath and stirring, let stand for 3h. Then drop 3 mol / L urea and 5 mol / L ammonia water in a ratio of 1:1 (volume ratio) into the microemulsion system at a rate of 0.5 d / s in a water bath at 80°C to produce precipitation until the pH is 8.5. The precipitate was aged for 24 hours, and the precipitate was filtered out. The precipitate was washed with indu...

Embodiment 3

[0017] The inverse microemulsion is added in the there-necked flask after mixing 40% cyclohexane, 15% n-butanol, 25% OP-10 emulsifier and 30% water (volume ratio), and stirred for 10 hours at a speed of 600 rev / min. Let stand for 12 hours. Prepare 0.5mol / L zirconium nitrate solution, 1.0mol / L manganese nitrate solution, and 1.5mol / L aluminum nitrate solution. Zirconium nitrate: manganese nitrate: aluminum nitrate is mixed at 1:1:12 (molar ratio) and then added dropwise to the inverse microemulsion in a constant temperature water bath at 80°C at a rate of 0.5d / s, and the amount of polyethylene glycol added is 2g. Stop the water bath and stirring, let stand for 2h. Then drop 2 mol / L urea and 3.5 mol / L ammonia water in a ratio of 2:1 (volume ratio) into the microemulsion system at a rate of 0.5 d / s in a water bath at 80°C to produce precipitation until the pH is 10. The precipitate was aged for 24 hours, and the precipitate was filtered out. The precipitate was washed with ind...

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Abstract

The invention discloses a preparation method of manganese zirconium mixing hexaaluminate catalysts, which mixes and stirs cyclohexane, Isobutanol, OP-10 emulsifier and water according certain volume ratio to prepare reverse microemulsion system; the invention adopts zirconium nitrate, manganous nitrate, aluminium nitrate and carbowax as material to mix and dissolve in deionized water, add into the prepared reverse microemulsion system, drip urea and ammonia precipitant according to certain volume ratio, to produce lodgment; prepare catalyst forequarter by high pressure kettle critical drying agent, manganese zirconium mixing hexaaluminate catalyst of good dispersing, less block and of platy shape is ahcieved after being baked in muffle furnace; the preparation method has simple technics, low cost, small size of crystal grain and stable high temperature.

Description

technical field [0001] The invention relates to a preparation method of a zirconium manganese doped hexaaluminate catalyst. Background technique [0002] Catalysts used for catalytic combustion mainly include noble metal supported catalysts, metal oxide catalysts, and doped hexaaluminates. Noble metals have good activity, but they are expensive, which limits the further development of noble metal catalysts. Metal oxide catalysts have higher thermal stability and cheap raw materials, which can be used as a substitute for noble metals. However, metal oxide catalysts are prone to high-temperature solid-state reactions with supports, which limits their use in high-temperature combustion reactions. Hexaaluminate is a crystal with a hexagonal layered structure formed by alternately stacking spinel structural units and mirror surfaces. Compared with other combustion catalysts, (1) the catalytic activity of hexaaluminate is close to that of noble metal-supported catalysts and meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J37/03B01J37/08
Inventor 余倩余林王苑娜张绮旎孙明
Owner GUANGDONG UNIV OF TECH
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