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Monodisperse platinum-based two-dimensional metal hydroxide, and in situ synthesis method and application thereof in purification of volatile oxygen-containing hydrocarbons

A hydroxide and in-situ synthesis technology, applied in the field of air pollution control, can solve the problems of easy agglomeration and deactivation of active centers, high price, and limitations, and achieve shortened synthesis time and energy consumption, low surface polarizability, Effect of low atomic coordination number

Active Publication Date: 2019-08-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price of precious metals and the easy agglomeration and deactivation of active centers, the prospect of further industrial application is limited.

Method used

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  • Monodisperse platinum-based two-dimensional metal hydroxide, and in situ synthesis method and application thereof in purification of volatile oxygen-containing hydrocarbons
  • Monodisperse platinum-based two-dimensional metal hydroxide, and in situ synthesis method and application thereof in purification of volatile oxygen-containing hydrocarbons
  • Monodisperse platinum-based two-dimensional metal hydroxide, and in situ synthesis method and application thereof in purification of volatile oxygen-containing hydrocarbons

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1 In situ synthesis of monodisperse platinum-based two-dimensional metal hydroxide catalytic materials by microwave-assisted method

[0040] Dissolve 0.27g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) in 30-45mL of deionized water, and continue stirring at 500-800rpm for 15min to form a transparent and clear solution . Add 4.0-5.3 g of hexamethylenetetramine to the above solution, and fully dissolve it under stirring at 500-800 rpm. Subsequently, 5-35 mmoL of cerium chloride heptahydrate (CeCl 3 ·7H 2 O), stir vigorously to fully dissolve. Slowly add 180-220 mL of ethylene glycol solution to the solution obtained above, and continue stirring for 15 min. Immediately after that, 3 mL of chloroplatinic acid hexahydrate-ethylene glycol solution (1.5 mg Pt / mL), and continue stirring at 800-1000rpm for 30min. The solution was placed in a three-necked flask of a microwave generator, and the power was set to 900W. The mix...

Embodiment 2

[0043] With the cerium chloride heptahydrate (CeCl) in embodiment 1 3 ·7H 2 O) was replaced by cobalt chloride hexahydrate (CoCl 2 ·6H 2 O), to obtain monodisperse platinum-based two-dimensional metal hydroxides, namely monodisperse Pt 1 -Co(OH) x Two-dimensional catalytic materials. Others are the same as in Example 1.

[0044] Monodisperse Pt 1 -Ce(OH) x Catalytic Degradation Activity of Methanol by Two-Dimensional Catalytic Materials

[0045] The catalytic reaction is carried out in a fixed bed. The catalyst obtained in Example 1 is pressed into tablets and sieved (40-60 mesh), and 0.3 mL of the sieved catalytic material is accurately weighed, activated at 200° C. for 1.5 h, and methanol (methanol ) as a probe gas, the concentration of reactants is controlled at 800ppm, and the reaction space velocity is 36000h -1 , the volume concentration of oxygen is 20%, respectively test the catalyst at 40°C, 60°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 1...

Embodiment 3

[0061] Dissolve 0.27 g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) in 30 mL of deionized water, and continue stirring at 800 rpm for 15 min to form a transparent and clear solution. 4.0 g of hexamethylenetetramine was added to the above solution, and fully dissolved under stirring at 800 rpm. Subsequently, 35 mmoL of cerium chloride heptahydrate (CeCl 3 ·7H 2O), stir vigorously to fully dissolve. Slowly add 180 mL of ethylene glycol solution to the solution obtained above, and continue stirring for 15 min. Immediately after that, 3 mL of chloroplatinic acid hexahydrate-ethylene glycol solution (1.5 mg Pt / mL), and continue stirring at 800-1000rpm for 30min. The solution was placed in a three-necked flask of a microwave generator, and the power was set to 900W. The mixed solution was heated to 150° C. and condensed and refluxed for 20 minutes under this condition.

[0062] After the liquid was cooled to room temperature, it was ce...

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Abstract

The invention discloses a monodisperse platinum-based two-dimensional metal hydroxide, and an in situ synthesis method and an application thereof in the purification of volatile oxygen-containing hydrocarbons. A triblock copolymer poly(ethylene oxide)-polypropylene oxide-poly(ethylene oxide) is dissolved into deionized water, so taht a transparent and clear solution can be formed through stirring;hexamethylene tetramine is added, and then cerium or cobalt salts are added after uniform stirring; glycol is added after uniform stirring; a chloroplatinic acid hexahydrate-glycol solution is addedafter uniform stirring, so that a mixed solution can be obtained after uniform stirring; and heating reflux reaction is performed on the mixed solution in a microwave generator, and centrifugation androasting are performed after complete reaction, so that the monodisperse platinum-based two-dimensional metal hydroxide can be obtained. The prepared catalytic material has atomic-scale dispersed platinum active sites and shows excellent low temperature purifying capabilities of volatile oxygen-containing hydrocarbons; and the related catalyst synthetic method is simple and low in raw material price, and has good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a monodisperse platinum-based two-dimensional metal hydroxide and its in-situ synthesis method and its application in room temperature purification of volatile oxygen-containing hydrocarbons. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) refer to organic compounds with a boiling point lower than 260°C at normal pressure, or a saturated vapor pressure exceeding 133.32Pa at room temperature (25°C), which are emitted into the air in the form of gaseous molecules The general term for all organic compounds. There are many kinds of VOCs, mainly including aliphatic hydrocarbons, oxygen-containing hydrocarbons, aromatic hydrocarbons and their derivatives, halogen-containing hydrocarbons, nitrogen-containing hydrocarbons, sulfur-containing hydrocarbons, etc. VOCs have high atmospheric chemical reactivity and are the ...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/89B01J35/10B01J37/34B01D53/86B01D53/72
CPCB01J23/63B01J23/8913B01J37/346B01D53/8668B01D2257/702B01J35/23B01J35/633B01J35/615
Inventor 何炽姜泽宇建艳飞于艳科
Owner XI AN JIAOTONG UNIV
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