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Preparation for platinum/attapulgite catalyst and application thereof

A catalyst and attapulgite technology, which is applied in the field of preparation of platinum/attapulgite catalysts, can solve problems that have not been reported yet, and achieve the effects of low price, high activity and selectivity, and small particle size

Inactive Publication Date: 2010-06-02
赵杰 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on using it as a carrier to support nano-platinum catalyst and its application to catalyze the hydrogenation of cinnamaldehyde to prepare cinnamyl alcohol has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh a certain mass of attapulgite clay into a beaker, add 4 mol / L hydrochloric acid at a liquid-solid ratio of 8:1, reflux in a water bath at 80°C for 2 hours, then centrifuge, wash with distilled water, dry at 105°C, grind and put in a desiccator spare. Pipette 0.5mL of 0.02mol / L chloroplatinic acid aqueous solution and add it to a 150mL three-neck flask, then add 50mL of deionized water, and then dropwise add a 1mol / L sodium hydroxide solution to adjust the pH of the solution to 9. Under the action of magnetic stirring, 399 mg of acidified attapulgite clay was added, and ultrasonically dispersed for 2 h to make the attapulgite dispersed uniformly. Then, under the action of magnetic stirring, 10 mL of potassium borohydride solution with a concentration of 0.004 mol / L was added dropwise, and the stirring was continued for 1.5 h after the dropwise addition, so that the chloroplatinic acid was completely reduced to platinum nanoparticles. Finally, stirring was continu...

Embodiment 2

[0015] Weigh a certain mass of attapulgite clay into a beaker, add 3 mol / L nitric acid at a liquid-solid ratio of 9:1, reflux in a water bath at 80 °C for 1 h, then centrifuge, wash with distilled water, dry at 105 °C, grind and put it in a desiccator spare. Pipette 0.8mL of 0.03mol / L chloroplatinic acid aqueous solution into a 150mL three-neck flask, then add 50mL of deionized water, and then dropwise add a 1mol / L sodium hydroxide solution to adjust the pH of the solution to 10. Under the action of magnetic stirring, 316 mg of acidified attapulgite clay was added, and ultrasonically dispersed for 2 h to make the attapulgite uniformly dispersed. Then, under the action of magnetic stirring, 10 mL of potassium borohydride solution with a concentration of 0.009 mol / L was added dropwise, and the stirring was continued for 1.5 h after the dropwise addition, so that the chloroplatinic acid was completely reduced to platinum nanoparticles. Finally, stirring was continued in an oil ...

Embodiment 3

[0017] Weigh a certain mass of attapulgite clay into a beaker, add 4 mol / L hydrochloric acid at a liquid-solid ratio of 8:1, reflux in a water bath at 80°C for 2 hours, then centrifuge, wash with distilled water, dry at 105°C, grind and put in a desiccator spare. Pipette 1.5mL of potassium chloroplatinate aqueous solution with a concentration of 0.04mol / L into a 150mL three-necked flask, then add 50mL of deionized water, and then dropwise add a 1mol / L sodium hydroxide solution to adjust the pH of the solution is 8. Under the action of magnetic stirring, 469 mg of acidified attapulgite clay was added, and ultrasonically dispersed for 3 h to make the attapulgite dispersed uniformly. Then, under the action of magnetic stirring, 10 mL of potassium borohydride solution with a concentration of 0.024 mol / L was added dropwise, and the stirring was continued for 2 h after the dropwise addition, so that potassium chloroplatinate was completely reduced to platinum nanoparticles. Finall...

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PUM

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Abstract

The invention discloses a platinum / attapulgite catalyst and a preparation method thereof. The carrier of the catalyst is the attapulgite clay; the active component of the catalyst is platinum nanoparticles of which the average particle size is 3 to 5 nm; the mass fraction of the platinum in the catalyst is 0.5 to 5 percent; and the residual component of the catalyst is the attapulgite clay. The preparation method comprises the following steps of: modifying the surface of the attapulgite clay with acid; adding a certain amount of modified attapulgite clay into aqueous solution of platinum salt; adjusting the pH value of the aqueous solution with sodium hydrate; adding aqueous solution of potassium borohydride or hydrazine hydrate dropwise in the aqueous solution under the action of magnetically stirring; filtering, washing and drying the mixed aqueous solution to obtain the platinum / attapulgite catalyst. The platinum / attapulgite catalyst prepared by the method of the invention is high in catalytic activity and selectivity for hydrogenation preparation of cinnamyl alcohol through cinnamaldehyde.

Description

technical field [0001] The invention relates to a catalyst for preparing cinnamyl alcohol by hydrogenation of cinnamaldehyde and a preparation method thereof, in particular to a preparation method of a platinum / attapulgite catalyst for catalyzing the hydrogenation of cinnamaldehyde to prepare cinnamyl alcohol. Background technique [0002] With the development of catalysis science, controlling the selectivity of the reaction becomes more and more important, among which the preparation of α,β-unsaturated alcohol from α,β-unsaturated aldehyde is one of the typical representatives of selective hydrogenation. Cinnamyl alcohol is an important α, β-unsaturated alcohol, which is widely used in the synthesis of flavors and fragrances, cosmetics, medicines and fungicides. In recent years, researchers at home and abroad have carried out a lot of research work on the selective hydrogenation of cinnamaldehyde to synthesize cinnamyl alcohol. From a thermodynamic point of view, since the...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J21/16B01J35/10C07C33/32C07C29/14
Inventor 赵杰葛昌华李艳
Owner 赵杰
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