Silica-supported lithium phosphate catalyst in eggshell shape, and preparation method and application thereof

A technology for supporting catalysts and silica, which is applied in the field of preparation of inorganic non-metallic catalytic materials and catalytic applications, and can solve the problems of low conversion rate of catalysts

Inactive Publication Date: 2014-02-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the liquid phase process, it generally depends on the boiling point of the solvent used, and the temperature is slightly lower, so the conversion rate of the catalyst is also relatively low, generally lower than 60%, such as JP1272539

Method used

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  • Silica-supported lithium phosphate catalyst in eggshell shape, and preparation method and application thereof
  • Silica-supported lithium phosphate catalyst in eggshell shape, and preparation method and application thereof
  • Silica-supported lithium phosphate catalyst in eggshell shape, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of hollow nano-silica microspheres:

[0026] Add 45mL of distilled water, 5mL of styrene, and 0.75g of polyvinylpyrrolidone into a 100mL three-neck flask, stir well at room temperature for 30min, control the temperature at 60°C, stir at a constant temperature, and add 12mL of an aqueous initiator solution (containing 0.2g of ammonium persulfate) dropwise. , and continued to react for 9h to obtain a polystyrene emulsion sample.

[0027] Add 3mL polystyrene emulsion, 0.6mL ammonia water (25% concentrated ammonia water), absolute ethanol and distilled water into a 100mL three-necked flask, and stir at room temperature for 30min. 5mL tetraethyl orthosilicate solution was added dropwise, and the reaction was continued for 12h. Aging at room temperature for 24 hours, centrifuged, washed three times with absolute ethanol, air-dried at 80°C for 8 hours, and placed in a muffle furnace for calcination at 800°C for 4 hours to obtain white SiO 2 nanospheres.

[0028]...

Embodiment 2

[0034] Potassium hydroxide was used to replace sodium hydroxide in the preparation process of alkaline lithium phosphate, and the remaining process conditions were the same as in Example 1.

Embodiment 3

[0036] Preparation of hollow nano-silica microspheres:

[0037] Add 45mL of distilled water, 5mL of styrene, and 0.75g of polyvinylpyrrolidone into a 100mL three-necked flask, stir well at room temperature for 30min, control the temperature at 90°C, stir at a constant temperature, and add 12mL of an aqueous initiator solution (containing 0.2g of ammonium persulfate) dropwise. , and continue to react for 10h to prepare a polystyrene emulsion sample.

[0038] Add 3mL polystyrene emulsion, 0.6mL ammonia water (25% concentrated ammonia water), absolute ethanol and distilled water into a 100mL three-necked flask, and stir at room temperature for 30min. 5mL tetraethyl orthosilicate solution was added dropwise, and the reaction was continued for 12h. Aging at room temperature for 24 hours, centrifuged, washed three times with absolute ethanol, air-dried at 80°C for 8 hours, and placed in a muffle furnace for calcination at 300°C for 4 hours to obtain white SiO 2 nanospheres.

[00...

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Abstract

The invention discloses a silica-supported lithium phosphate catalyst and a preparation method thereof. The catalyst, with hollow nano silica microsphere as a carrier and loaded with basic lithium phosphate, can be used for gas phase isomerization of epoxy propane. The preparation method is as below: preparing a nano hollow spherical silica microsphere with high specific area by using functionalized polystyrene as a template; preparing basic lithium phosphate by using a water solution containing lithium and alkali metal ions and a water solution containing phosphate ions; and then loading the lithium phosphate onto the silica microsphere to prepare the supported catalyst. The obtained silica supported lithium phosphate catalyst can be used in reaction for isomerization of epoxy alkane into corresponding allylic alcohol, and has higher conversion rate and selectivity at low temperature.

Description

technical field [0001] The invention relates to an inorganic catalyst and a preparation method thereof, in particular to a silica-loaded lithium phosphate eggshell catalyst and a preparation method thereof, belonging to the technical field of preparation of inorganic non-metallic catalytic materials and catalytic application. Background technique [0002] Allyl alcohol is an important chemical intermediate and fine chemical product. Because the molecular structure contains two functional groups, double bond and hydroxyl, it can participate in oxidation, reduction, esterification, etherification and addition, etc. It is used in chemicals, medicine , spices and organic synthesis have a wide range of uses. The main derivatives and their uses are: for the synthesis of epichlorohydrin, glycerin, 1,4-butanediol and allyl ketone and other important organic synthetic raw materials, and its important derivative allyl ester is mainly used as a raw material for the production of polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/182B01J35/02C07C33/03C07C29/56
Inventor 马卫华钟秦蒋微吴文宏
Owner NANJING UNIV OF SCI & TECH
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