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High dispersion supported nano noble metal catalyst and preparation method and application thereof

A precious metal catalyst and a supported technology, which are applied in the field of supported nano precious metal catalysts and their preparation, can solve the problems of cumbersome process, large particle size of active components in the catalyst, poor dispersibility and stability, etc., so as to improve the structural stability, Excellent catalytic performance, mild reducing effect

Inactive Publication Date: 2014-12-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method is cumbersome, energy-consuming and time-consuming, and the active component particle size in the obtained catalyst is large, the combination with the carrier is weak, and the dispersibility and stability are poor, so the catalytic activity is low and easy to deactivate in the catalytic reaction.

Method used

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  • High dispersion supported nano noble metal catalyst and preparation method and application thereof
  • High dispersion supported nano noble metal catalyst and preparation method and application thereof
  • High dispersion supported nano noble metal catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A. Add 1.5384g of Mg(NO 3 ) 2 ·6H 2 O and 1.1254g of Al(NO 3 ) 3 9H 2 O is prepared into 50ml mixed salt solution; take 0.04mol / L H with a pipette 2 PdCl 4 Add 5ml of the solution to the above mixed solution;

[0020] B. Add the mixed salt solution of step A into the reaction container, ultrasonically disperse it for 20 minutes, and mix it evenly; add LiOH solution with a concentration of 0.18mol / L to the above mixed metal salt solution, and adjust the pH of the solution to 8.0; in N 2 atmosphere, crystallize at a reaction temperature of 40°C for 8 hours; cool to room temperature, and centrifuge and wash with deionized water until neutral to obtain a precipitate.

[0021] C. Take by weighing 4.4588g glucose and dissolve in 50ml aqueous ethanol (V C2H5OH / V H2O =1:3), slowly pour the precipitate obtained above into the aqueous glucose alcohol solution, and ultrasonically disperse it for 20 minutes; pour the mixed solution into the reaction kettle, seal it, put ...

Embodiment 2

[0024] 2.3076g of Mg(NO 3 ) 2 ·6H 2 O and 1.1254g of Al(NO 3 ) 3 9H 2O is prepared into a 50ml mixed solution; use a pipette to take 0.04mol / L of H 2 PdCl 4 Add 5ml of the solution to the above mixed solution; weigh 0.648g of LiOH solid and dissolve it in 150ml of deionized water to prepare an alkaline solution, wherein the concentration of the LiOH alkaline solution is 0.18mol / L.

[0025] Add the prepared mixed metal salt solution into the reaction vessel, ultrasonically disperse it for 20 minutes to make it evenly mixed; add the alkaline solution dropwise into the above mixed metal salt solution with a burette, and adjust the pH of the solution to 7.0; 2 atmosphere, crystallize at a reaction temperature of 40°C for 8 hours; cool to room temperature, and centrifuge and wash with deionized water until neutral to obtain a precipitate.

[0026] Take by weighing 2.6753g glucose and dissolve in 50ml aqueous methanol (V CH3OH / V H2O =1:1), slowly pour the precipitate obtai...

Embodiment 3

[0029] 1.9230g of Mg(NO 3 ) 2 ·6H 2 O and 1.1254g of Al(NO 3 ) 3 9H 2 O is prepared into a 50ml mixed solution; use a pipette to take 0.04mol / L of H 2 PtCl 4 Add 5ml of the solution to the above mixed solution; weigh 0.648g of LiOH solid and dissolve it in 150ml of deionized water to prepare an alkaline solution, wherein the concentration of LiOH is 0.18mol / L.

[0030] Add the prepared mixed metal salt solution into the reaction vessel, ultrasonically disperse for 20 minutes to make it evenly mixed; slowly add the alkaline solution dropwise into the above mixed metal salt solution, and adjust the pH of the solution to 6.5; 2 Atmosphere, crystallize at a reaction temperature of 30°C for 8 hours; cool to room temperature, and centrifuge and wash with deionized water until neutral to obtain a precipitate.

[0031] Take by weighing 1.7835g glucose and dissolve in 60ml aqueous ethanol (V C2H5OH / V H2O =1:2), slowly pour the precipitate obtained above into the aqueous gluco...

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Abstract

The invention relates to a high dispersion supported nano noble metal catalyst and a preparation method and application thereof. The preparation method comprises the following steps of: simultaneously compositing and reducing in one step under solvothermal condition based on an MgAl laminated double metal hydroxide of metal coordination ionic intercalation with palladium and platinum to obtain high dispersion amorphous carbon and laminated double metal hydroxide supported high dispersion noble metal Pd or Pt nano catalyst; applying to citral selective hydration to reaction for preparing citronellal or citronellol; and displaying excellent activity and high selectivity to products citronellal and citronellol. The catalyst is novel and unique in structure, green and energy-saving in process and strong in stability, and has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a supported nanometer precious metal catalyst and a preparation method thereof. The catalyst is used for the selective hydrogenation of citral. technical background [0002] Citral is one of the most challenging α,β-unsaturated aldehydes and ketones, which contains three unsaturated bonds: two C=C double bonds and one C=O double bond. Since citronellal (CAL) or citronellol (COL) is an essential raw material in the preparation of spices, improving its yield is the main purpose of selective hydrogenation of citral. The noble metals Pd and Pt are commonly used catalysts for the hydrogenation of citral because of their good catalytic activity. Usually supported noble metal catalysts are obtained by first impregnating noble metal salts on the carrier, and then reducing them with an external reducing agent (hydrogen and borohydride, etc.) after deposition, drying, and ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J23/42C07C47/21C07C45/62C07C33/025C07C29/17C07C29/141
Inventor 李峰南春实范国利
Owner BEIJING UNIV OF CHEM TECH
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