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High-dispersion supported PtCo nano-alloy catalyst as well as preparation method and application thereof

A technology of alloy catalysts and nano-alloys, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of chronic poisoning of toluene and complicated preparation process, and improve the structure The effects of stability, ease of preparation, and excellent catalytic performance

Inactive Publication Date: 2015-12-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the preparation process of this method is complicated, and the toluene used in the preparation process has chronic poisoning

Method used

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  • High-dispersion supported PtCo nano-alloy catalyst as well as preparation method and application thereof
  • High-dispersion supported PtCo nano-alloy catalyst as well as preparation method and application thereof
  • High-dispersion supported PtCo nano-alloy catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1.536gMg(NO 3 ) 2 ·6H 2 O, 1.125gAl(NO 3 ) 3 9H 2 O and 0.0173gCo(NO 3 ) 2 ·6H 2 O was prepared into 100ml mixed salt solution, and LiOH solution with a concentration of 0.1mol / L was added dropwise to the above mixed metal salt solution, and the pH of the solution was adjusted to 9.0; crystallized at a reaction temperature of 70°C for 24 hours; cooled to room temperature, deionized Centrifuge and wash with water until neutral, and dry at 70°C to obtain MgAl-Co-LDH precipitates.

[0022] Precipitate 0.1235gMgAl-Co-LDH, 0.0883gNa 2 PtCl 4 ·6H 2 O and 1.418g of melamine were mixed, heated to 500°C under a nitrogen atmosphere, kept for 5h, and cooled to room temperature naturally to obtain a highly dispersed and supported nano-PtCo alloy catalyst. The average particle size of metal alloy nanoparticles is 5nm, the mass percentage of Pt element in the catalyst is 4.6%, and the mass percentage of Co element in the catalyst is 0.5%.

[0023]For the hydrogenation cat...

Embodiment 2

[0025] 1.536gMg(NO 3 ) 2 ·6H 2 O, 1.125gAl(NO 3 ) 3 9H 2 O and 0.04325gCo(NO 3 ) 2 ·6H 2 O was prepared into 100ml mixed salt solution, and LiOH solution with a concentration of 0.1mol / L was added dropwise to the above mixed metal salt solution, and the pH of the solution was adjusted to 9.0; crystallized at a reaction temperature of 70°C for 24 hours; cooled to room temperature, deionized Centrifuge and wash with water until neutral, and dry at 70°C to obtain LDHs precipitates. 0.1235gMgAl-Co-LDH, 0.0893gNa 2 PtCl 4 ·6H 2 O and 1.418g of melamine were mixed, heated to 600°C under a nitrogen atmosphere, kept for 5h, and naturally cooled to room temperature to obtain a highly dispersed and supported nano-PtCo alloy catalyst. The average particle size of the alloy is 7nm, the mass percentage of Pt in the catalyst is 4.7%, and the mass percentage of Co in the catalyst is 1.0%.

[0026] The test method for the catalytic reaction performance of cinnamaldehyde hydrogenat...

Embodiment 3

[0028] 1.536gMg(NO 3 ) 2 ·6H 2 O, 1.125gAl(NO 3 ) 3 9H 2 O and 0.1068gCo(NO 3 ) 2 ·6H 2 O was prepared into 100ml mixed salt solution, and LiOH solution with a concentration of 0.1mol / L was added dropwise to the above mixed metal salt solution, and the pH of the solution was adjusted to 9.0; crystallized at a reaction temperature of 70°C for 24 hours; cooled to room temperature, deionized Centrifuge and wash with water until neutral, and dry at 70°C to obtain MgAl-Co-LDH precipitates. 0.1235gMgAl-Co-LDH, 0.0907ga 2 PtCl 4 ·6H 2 O and three 1.418g polycyanamides were mixed, heated to 600°C under a nitrogen atmosphere, kept for 6h, and naturally cooled to room temperature to obtain a highly dispersed and supported nano-PtCo alloy catalyst. The average particle size of metal alloy nanoparticles is 9.5nm, the mass percentage of Pt element in the catalyst is 5.0%, and the mass percentage of Co element in the catalyst is 1.5%.

[0029] The test method for the catalytic r...

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Abstract

The invention relates to a high-dispersion supported PtCo nano-alloy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a noble metal precursor, an Mg-Al-Co layered double-metal hydroxide precursor and melamine by easy co-calcining, and simultaneously compounding and reducing in one step under a high temperature condition to obtain the carbon nitride (C3N4) supported high-dispersion PtCo nano-alloy catalyst finally. When the catalyst is used in reaction of preparing fragrant cinnamyl alcohol by selective hydrogenation of cinnamyl aldehyde, the conversion percent of the cinnamyl aldehyde and the selectivity on the cinnamyl alcohol can be up to 85-100% and 80-100%; the preparation method of the high-dispersion supported PtCo nano-alloy catalyst is green; the catalyst is novel and unique in structure, high in stability, and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a supported PtCo nano-alloy catalyst and a preparation method thereof. This catalyst is used for the selective hydrogenation of cinnamaldehyde. technical background [0002] α, β-unsaturated aldehydes and ketones have conjugated bonds (C=C and C=O bonds), and there are C=C double bonds and C=O double bonds in the hydrogenation reaction to compete for adsorption, so that selective hydrogenation has different products of selective hydrogenation. Cinnamaldehyde is a representative substance of α,β-unsaturated aldehydes and ketones, and its selective hydrogenation products are widely used in spices, medicine and other fields, such as cinnamyl alcohol. At present, the widely used hydrogenation catalyst of cinnamaldehyde is Pt catalyst, however, the activity and selectivity of monometallic Pt catalyst in hydrogenation reaction are not optimal. Bimetallic (alloy) catalys...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C33/32C07C29/141
Inventor 李峰韩瑞瑞范国利杨兰
Owner BEIJING UNIV OF CHEM TECH
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