Core-shell structure Pd-Sn@SiO2 catalyst and preparation method

A core-shell structure and catalyst technology, applied in the field of nano-catalyst preparation process and environmental protection, can solve the problems of poor thermal stability, deactivation of precious metals, etc., and achieve the effects of low equipment requirements, no secondary pollution, and solvent recovery.

Inactive Publication Date: 2017-06-27
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The supported noble metal catalyst prepared by the traditional loading method has high activity, but poor thermal stability, and the noble metal is deactivated due to sintering and aggregation.

Method used

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  • Core-shell structure Pd-Sn@SiO2 catalyst and preparation method
  • Core-shell structure Pd-Sn@SiO2 catalyst and preparation method
  • Core-shell structure Pd-Sn@SiO2 catalyst and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh palladium nitrate tetraammonia and tin tetrachloride pentahydrate, dissolve them together in distilled water, and make Pd 2+ The solubility is 0.0583mol / L, Sn 4+ It is an aqueous solution with a solubility of 0.2612mol / L. Weigh 20.16g of polyethylene glycol mono-4-nonphenyl ether (n≈5) and dissolve it in cyclohexane, add 2.16ml of the above-mentioned nickel nitrate aqueous solution to the solution, and stir at 30°C for 15h. Then add 2.16ml of concentrated ammonia water with a mass fraction of 28%, continue stirring at 30°C for 2h, then add 2.5ml of tetraethyl orthosilicate, and continue stirring at 30°C for 48h. Add 16ml of ethanol to the resulting solution, then centrifuge at 10000rp / min for 15min to collect, and wash with cyclohexane three times. Vacuum drying at 40°C for 12h, proper grinding, and calcination at 600°C for 4h at a heating rate of 2°C / min in an air atmosphere to obtain Pd-Sn@SiO 2 Catalyst, wherein the massfraction of palladium is 2%, and the m...

Embodiment 2

[0027] Weigh palladium nitrate tetraammonia and tin tetrachloride pentahydrate, dissolve them together in distilled water, and make Pd 2+ The solubility is 0.0291mol / L, Sn 4+ It is an aqueous solution with a solubility of 0.2612mol / L. Weigh 20.16g of polyethylene glycol mono-4-nonphenyl ether (n≈5) and dissolve it in cyclohexane, add 2.16ml of the above-mentioned nickel nitrate aqueous solution to the solution, and stir at 30°C for 15h. Then add 2.16ml of concentrated ammonia water with a mass fraction of 28%, continue stirring at 30°C for 2h, then add 2.5ml of tetraethyl orthosilicate, and continue stirring at 30°C for 48h. Add 16ml of ethanol to the resulting solution, then centrifuge at 10000rp / min for 15min to collect, and wash with cyclohexane three times. Vacuum drying at 40°C for 12h, proper grinding, and calcination at 600°C for 4h at a heating rate of 2°C / min in an air atmosphere to obtain Pd-Sn@SiO 2 Catalyst, wherein the massfraction of palladium is 1%, and the m...

Embodiment 3

[0029] Weigh palladium nitrate tetraammonia and tin tetrachloride pentahydrate, dissolve them together in distilled water, and make Pd 2+ The solubility is 0.0583mol / L, Sn 4+ It is an aqueous solution with a solubility of 0.1306mol / L. Weigh 20.16g of polyethylene glycol mono-4-nonphenyl ether (n≈5) and dissolve it in cyclohexane, add 2.16ml of the above-mentioned nickel nitrate aqueous solution to the solution, and stir at 30°C for 15h. Then add 2.16ml of concentrated ammonia water with a mass fraction of 28%, continue stirring at 30°C for 2h, then add 2.5ml of tetraethyl orthosilicate, and continue stirring at 30°C for 48h. Add 16ml of ethanol to the resulting solution, then centrifuge at 10000rp / min for 15min to collect, and wash with cyclohexane three times. Vacuum drying at 40°C for 12h, proper grinding, and calcination at 600°C for 4h at a heating rate of 2°C / min in an air atmosphere to obtain Pd-Sn@SiO 2 Catalyst, wherein the massfraction of palladium is 2%, and the m...

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Abstract

The invention relates to a core-shell structure Pd-Sn@SiO2 catalyst and a preparation method. The catalyst is a Pd-Sn@SiO2 core-shell material prepared by adopting a reverse microemulsion method. The catalyst is obtained by stirring at room temperature, carrying out reaction, centrifuging, carrying out vacuum drying and carrying out high temperature roasting. The Pd-Sn@SiO2 catalyst prepared by adopting the method, under the conditions of normal pressure, reaction gas composition including 1% of CO and 21% of O2, N2 balance gas and airspeed of 36000ml.gcat<-1>.h<-1>, can realize complete catalytic combustion of CO at the temperature of 150 DEG C. The catalyst provided by the invention has the advantages of simple preparation technology, no secondary pollution to the environment, high activity at low temperature, sintering resistance at high temperature and the like.

Description

technical field [0001] The invention belongs to the technical fields of nano catalyst preparation technology and environmental protection. Background technique [0002] Recently, environmental deterioration has become increasingly prominent, and CO is one of the toxic gas pollutants in the air. Because it is colorless and tasteless, it is easy to ignore and cause poisoning. It can combine with hemoglobin in the human body, weaken the ability of hemoglobin to transport oxygen, and cause hypoxia. In mild cases, headache, dizziness, nausea, vomiting, and general fatigue may occur. Died from respiratory paralysis. CO mainly comes from motor vehicle exhaust, factory exhaust gas, civilian stoves, and exhaust gas from solid waste incineration. At present, the low-temperature oxidation of CO has become one of the hotspots in catalytic research, and it has important application value in many aspects, such as air purification, CO gas mask, CO sensor, etc. Among them, catalytic oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01D53/86B01D53/62
CPCB01D53/864B01J23/626B01J35/0073Y02A50/20
Inventor 彭洪根饶成王翔
Owner NANCHANG UNIV
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