Carbon-supported multi-component catalyst and preparation method and application thereof

A multi-component, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the selectivity and yield of benzotriazole products. The rate is not high, there are potential safety hazards, and the quality of products is affected, so as to achieve high industrial application value, reduce catalyst costs, and reduce three wastes.

A multi-component, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the selectivity and yield of benzotriazole products. The rate is not high, there are potential safety hazards, and the quality of products is affected, so as to achieve high industrial application value, reduce catalyst costs, and reduce three wastes.

CN105214686AActive Publication Date: 2016-01-06ZHEJIANG UNIV OF TECH +1
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  • Carbon-supported multi-component catalyst and preparation method and application thereof
  • Carbon-supported multi-component catalyst and preparation method and application thereof
  • Carbon-supported multi-component catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Weigh 0.088gPdCl 2 , 0.132gH 2 PtCl 6 ·6H 2 O, 0.088gCu(NO 3 ) 2 2H 2 O and 0.6g Potassium Citrate are put into there-necked flask; Add 150ml ethylene glycol in flask again and stir about 0.5h at room temperature, obtain precursor solution; Add 5g gac again in the prepared precursor solution, 25 Keep stirring and impregnating at a constant temperature at ℃ for 4 hours; after the impregnation is completed, add 5wt.% KOH / EG solution dropwise to adjust the pH value of the slurry to 10; then raise the temperature to 160°C and keep stirring at a constant temperature for 6 hours; after cooling, filter and use the filter cake Wash with deionized water until neutral; then vacuum-dry at 80°C for about 12 hours. That is, 5.125g of 1%Pd1%Pt0.5%Cu / C catalyst was obtained.

[0052] figure 1 It is the transmission electron microscope characterization figure of the catalyst 50nm scale that the present embodiment makes, from figure 1 It can be seen that the particle size of th...

Embodiment 2

[0056] Weigh 0.066gPdCl 2 , 0.1gH 2 PtCl 6 ·6H 2 O, 0.088gCu(NO 3 ) 2 2H 2 O and 0.5g Potassium Citrate are put into there-necked flask; Add 150ml ethylene glycol in flask again and stir about 0.5h at room temperature, obtain precursor solution; Then add 5g activated carbon in the prepared precursor solution, 25 Keep stirring and impregnating at a constant temperature at ℃ for 4 hours; after the impregnation is completed, add 5wt.% KOH / EG solution dropwise to adjust the pH value of the slurry to 10; then raise the temperature to 160°C and keep stirring at a constant temperature for 6 hours; after cooling, filter and use the filter cake Wash with deionized water until neutral; then vacuum-dry at 80°C for about 12 hours. That is, 5.1 g of 0.75% Pd0.75% Pt0.5% Cu / C catalyst was obtained.

Embodiment 3

[0058] Weigh 0.044gPdCl 2 , 0.066gH 2 PtCl 6 ·6H 2 O, 0.088gCu(NO 3 ) 2 2H 2 O and 0.4g Potassium Citrate are put into there-necked flask; Add 150ml ethylene glycol in flask again and stir about 0.5h at room temperature, obtain precursor solution; Add 5g gac again in the prepared precursor solution, 25 Keep stirring and impregnating at a constant temperature at ℃ for 4 hours; after the impregnation is completed, add 5wt.% KOH / EG solution dropwise to adjust the pH value of the slurry to 10; then raise the temperature to 160°C and keep stirring at a constant temperature for 6 hours; after cooling, filter and use the filter cake Wash with deionized water until neutral; then vacuum-dry at 80°C for about 12 hours. That is, 5.075 g of 0.5% Pd0.5% Pt0.5% Cu / C catalyst was obtained.

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Abstract

The invention provides a carbon-supported multi-component catalyst and a preparation method thereof. The catalyst is prepared from a carrier and metal active components loaded on the carrier. The carrier is activated carbon. The metal active components comprise palladium, platinum and a transition metal element assistant. Based on the mass of the carrier, namely, the activated carbon, the capacity of palladium ranges from 0.5 wt% to 5.0 wt%, the capacity of platinum ranges from 0.5 wt% to 5.0 wt%, and the capacity of the transition metal element assistant ranges from 0.1 wt% to 2.5 wt%. Meanwhile, the mass ratio of palladium to platinum is 1:0.5-2.0. The catalyst can be applied to catalytic hydrogenation for synthesis of benzotriazole ultraviolet absorbent. The preparation method of the catalyst is easy and convenient, the catalytic activity is high, the selectivity and yield of target products are high, good stability is achieved, and meanwhile three wastes generated in the hydrogenation process are fewer.

Description

(1) Technical field [0001] The invention relates to a carbon-supported multi-component catalyst and a preparation method thereof. The carbon-supported multi-component catalyst can be applied to catalytic hydrogenation to synthesize benzotriazole-type ultraviolet absorbers. (2) Background technology [0002] Benzotriazole UV absorbers are the main varieties of plastic light stabilizers. They have excellent UV absorption capacity and can absorb UV rays with a wavelength of 290-400nm. And it has the advantages of lighter color, lower toxicity, less volatilization, good oil resistance, good compatibility with polymers, etc., and is widely used in polypropylene, polyethylene, polyvinyl chloride, polyoxymethylene, poly Photochemical modification of various synthetic materials such as amide, polystyrene, polyurethane, alkyd resin, etc. [0003] The synthesis of benzotriazole UV absorbers is a complex multi-step reaction. Firstly, the azo intermediate corresponding to the product ...

Claims

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Application Information

Patent Timeline
06 Jan 2016
Publication
CN105214686A
IPC
B01J23/89; B01J23/60; B01J23/44; B01J23/652; C07D249/20
Inventors
丰枫; 郑红朝