Delaminated hydrotalcite nano-sheet based composite catalyst and preparation method therefor

A composite catalyst and hydrotalcite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as unrecyclable and difficult to recycle colloidal catalysts , to achieve the effect of improving activity and selectivity, enhancing stability and recyclability

Active Publication Date: 2017-05-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the colloidal catalyst obtained after the laminate is peeled off is difficult to recover and cannot be recycled

Method used

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  • Delaminated hydrotalcite nano-sheet based composite catalyst and preparation method therefor
  • Delaminated hydrotalcite nano-sheet based composite catalyst and preparation method therefor
  • Delaminated hydrotalcite nano-sheet based composite catalyst and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A. Weigh 0.03mol of Co(NO 3 ) 2 ·6H 2 O, 0.01mol of Al(NO 3 ) 3 9H 2 O and 0.2mol of urea, add 100mL deionized water to dissolve, transfer the solution to a polytetrafluoroethylene reactor, react at 110°C for 12h, centrifuge the supernatant to pH=7 after the reaction, and place it in an oven at 60°C Dry to get CoAl-CO 3 2- - LDHs;

[0039] B. Weigh 0.3g of the above CoAl-CO 3 2- -LDHs in the flask, add 0.2mol NaNO 3 and 300mL of deionized water, and adjust the pH to 5-6 with concentrated nitric acid, and stir for 24 hours under a nitrogen atmosphere. After the reaction, centrifuge until the supernatant has a pH of 7, and fully dry it in a vacuum oven at 60°C to obtain NO 3 - Intercalated LDHs, expressed as CoAl-NO 3 - - LDHs;

[0040] C. Weigh 0.1g of CoAl-NO from step B 3 - -LDHs in the flask, add 100mL formamide, stir for 48h under nitrogen atmosphere, get a clear and transparent colloidal solution, expressed as CoAl-ELDH;

[0041] D. Weigh 0.03g GO a...

Embodiment 2

[0044] A. with embodiment 1;

[0045] B. Weigh 0.3g of the above CoAl-CO 3 2- -LDHs in the flask, add 0.2mol Na 2 SO 4 and 300mL deionized water, and adjust the pH=5~6 with concentrated sulfuric acid, stir for 24h under nitrogen atmosphere, centrifuge after the reaction until the supernatant pH=7, fully dry in a vacuum oven at 60°C to obtain SO 4 2- Intercalated LDHs, expressed as CoAl-SO 4 2- - LDHs;

[0046] C. Weigh 0.1g of CoAl-SO from Step B 4 2- -LDHs in a 500mL flask, add 100mL N,N-dimethylformamide, ultrasonication for 2h, to obtain a clear and transparent colloidal solution, expressed as CoAl-ELDH;

[0047] D. Weigh 0.05g MgO and disperse it in 100mL of sodium lauryl sulfate aqueous solution with a concentration of 0.25g / L, and ultrasonically disperse it for 30min to obtain a uniformly dispersed MgO slurry;

[0048]E. Add the MgO slurry in step D dropwise to the colloid solution in step C at a rate of 2 mL / min. After the dropwise addition, use deionized wate...

Embodiment 3

[0050] A. with embodiment 1;

[0051] B. Weigh 0.3g of the above CoAl-CO 3 2- -LDHs in a 500mL flask, add 0.1mol sodium dodecyl sulfate and 300mL deionized water, stir for 24h under nitrogen atmosphere, centrifuge after the reaction, and fully dry in a vacuum oven at 60°C to obtain dodecylsulfuric acid Sodium-intercalated LDHs, expressed as CoAl-SDS-LDHs;

[0052] C. Weigh 0.1g of CoAl-SDS-LDHs from step B into a flask, add 100mL of n-butanol, and stir for 12h under a nitrogen atmosphere to obtain a clear and transparent colloidal solution, expressed as CoAl-ELDH;

[0053] D. Weigh 0.05g HAP and disperse it in 100mL of sodium lauryl sulfate aqueous solution with a concentration of 0.25g / L, and ultrasonically disperse for 30min to obtain a uniformly dispersed HAP slurry;

[0054] E. Add the HAP slurry in step D dropwise to the colloid solution in step C at a rate of 2 mL / min. After the dropwise addition, use deionized water to centrifuge and wash the precipitate several time...

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Abstract

The invention provides a delaminated hydrotalcite nano-sheet based composite catalyst and a preparation method therefor. The preparation method for the catalyst comprises the steps of introducing cationic active ingredients into a hydrotalcite laminate to form a precursor with a layered structure, then, carrying out swelling to enable the laminate to be delaminated into 1 to 10 layers, carrying out compounding on obtained hydrotalcite nano-sheets and a support with a special surface structure or electron features, and carrying out washing and drying, thereby obtaining the M1M2-ELDH/S catalyst, wherein M1 represents a divalent metal cation for forming a hydrotalcite structure, M2 represents a trivalent metal cation for forming the hydrotalcite structure, ELDH represents a delaminated hydrotalcite nano-sheet, and S represents the support. The catalyst has the characteristics that the variety and ratio of the active ingredients are adjustable; after the laminate is delaminated into 1 to 10 layers, an active center is exposed to the maximum, and the stability and cycle use performance of the catalyst can be improved after the active center is compounded with the support; and the hydrotalcite laminate and the support with the special surface structure and the electron features generate an interaction, so that the activity and selectivity of the catalyst are further improved.

Description

technical field [0001] The invention relates to a composite catalyst based on exfoliated hydrotalcite nanosheets and a preparation method thereof. The catalyst selects the highly dispersed hydrotalcite layered material with adjustable layer metal as the precursor of the active component, and uses the swelling method to peel off the layer to 1-10 layers, and fully exposes the obtained active site The three-dimensional unit wafer is combined with a high specific surface carrier with special surface structure and electronic characteristics to realize the immobilization of hydrotalcite nanosheets, thereby improving the activity, stability and recyclability of the catalyst. The catalyst can be applied in various oxidation reaction processes in petrochemical, fine chemical and other fields. Background technique [0002] Metal catalysts are widely used in petrochemical, fine chemical, photocatalytic, electrochemical and other chemical processes. Supported noble metal catalysts, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/16B01J23/75B01J23/755B01J23/78B01J27/185B01J27/187
Inventor 冯俊婷李殿卿贺宇飞王倩杜逸云
Owner BEIJING UNIV OF CHEM TECH
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