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Preparation method and application of multi-walled carbon nanotube supported La and Al co-modified platinum-based catalyst

A technology of multi-walled carbon nanotubes and catalysts, applied in the direction of catalyst activation/preparation, elimination of hydroxyl groups, chemical instruments and methods, etc., can solve the problems of high cost of glycerin hydrogenation catalysts, harsh reaction conditions, and large hydrogen consumption, and achieve Good recycling effect, short reaction time, and reduced reducing energy

Active Publication Date: 2018-02-23
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems of high cost of glycerin hydrogenation catalysts, harsh reaction conditions and large hydrogen consumption existing in the prior art, the present invention provides a method for preparing a platinum-based catalyst loaded with multi-walled carbon nanotubes and co-modified with La and Al. and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 5g of multi-walled carbon nanotubes and place them in a 150mL round bottom flask, add the corresponding volume of concentrated HNO with a mass fraction of 68% at a solid-to-liquid mass ratio of 1:15 3 75mL, at 100°C, stirred at constant temperature and reflux for 16 hours. The acid-modified carbon nanotubes were repeatedly washed with deionized water until the filtrate was neutral.

[0034] First, dissolve 1g of chloroplatinic acid solid in deionized water, slowly pour the solution into a 100mL volumetric flask along the glass rod for constant volume, then invert the volumetric flask upside down 3 times to dissolve evenly, and then let it stand for 1 hour to constant volume. content, at a temperature of 25°C, use an ultrasonic instrument to ultrasonically stir for 30 minutes, and prepare an aqueous solution of chloroplatinic acid with a solid-liquid mass ratio of 1:100;

[0035] Weigh 2g of carbon nanotubes (MWCNT) into a 50mL round-bottomed flask, add 20mL of de...

Embodiment 2

[0037] Weigh 0.1 g of the La-Al-Pt / MWCNT catalyst obtained in Example 1 and place it in a 50 mL liner of a miniature autoclave, add 12 mL of deionized water, 1.2 g of glycerin, add 0.21 g of levulinic acid, and put in a magnet, Seal the autoclave, replace the air in the autoclave with nitrogen for 3 times, evacuate the autoclave to vacuum with a vacuum pump, and then press and hold the heating button to start heating. When the set reaction temperature of 180°C is reached, hydrogen gas is introduced to pressurize to 3.5MPa, press and hold the stirring button, and the reaction timing starts. After reacting for 6 hours, the reaction was terminated, the reaction mixture was filtered, and the content of each substance in the filtrate was analyzed by gas chromatography. The conversion rate of glycerol was 52.97%, and the selectivity of 1,3-propanediol was 35.34%.

Embodiment 3

[0039] Weigh 0.1 g of the La-Al-Pt / MWCNT catalyst obtained in Example 1 and place it in a 50 mL liner of a miniature autoclave, add 12 mL of deionized water, 1.2 g of glycerin, add 0.21 g of levulinic acid, and put in a magnet, Seal the autoclave, replace the air in the autoclave with nitrogen for 3 times, evacuate the autoclave to vacuum with a vacuum pump, and then press and hold the heating button to start heating. When the set reaction temperature of 200°C is reached, hydrogen gas is introduced to pressurize to 3.5MPa, press and hold the stirring button, and the reaction timing starts. After reacting for 6 hours, the reaction was terminated, the reaction mixture was filtered, and the content of each substance in the filtrate was analyzed by gas chromatography. The conversion rate of glycerol was 56.17%, and the selectivity of 1,3-propanediol was 39.12%.

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Abstract

The invention discloses a preparation method and an application of a multi-walled carbon nanotube supported La and Al co-modified platinum-based catalyst. A multi-walled carbon nanotube is subjected to acid modification, a certain amount of chloroplatinic acid water solution is added, a nitrate precursor is added according to a certain proportion, and drying, calcining and reducing are performed after reaction to obtain the catalyst, namely, La-Al-Pt / MWCNT. The preparation method is simple, the needed catalyst can be obtained by a primary impregnation method, a carrier is low in price and easyto obtain, the cost is greatly reduced, recycling effects are good, the obtained catalyst is used for glycerol hydrogenation reaction, short in reaction time, economical, effective, environmentally friendly and low in hydrogen consumption, products are easily separated, high glycerol transformation rate and 1, 3-propylene glycol selectivity can be achieved under mild reaction conditions, processproduction conditions are improved, and the quality of corresponding products is improved.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method and application of a multi-walled carbon nanotube loaded La and Al co-modified platinum-based catalyst. Background technique [0002] Glycerol hydrogenation mainly produces 1,3-propanediol, 1,2-propanediol, n-propanol and isopropanol, among which 1,3-propanediol is used as a polymer monomer to synthesize propylene terephthalate (PTT) with excellent performance, and Compared with polyesters synthesized by other monomers, it has better characteristics, such as its good resilience of nylon (it can still return to its original shape after being stretched by 20%), and its anti-pollution performance. Its mechanical properties are comparable to those of PA6 fibers. Quite, the production cost is lower than that of PA6 fiber, and it can be recycled. At present, 1,3-propanediol has been used in medicine, and new products synthesized from 1,3-propanediol as organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/34B01J37/08B01J37/18C07C29/60C07C31/20
CPCB01J23/63B01J37/08B01J37/18B01J37/343C07C29/60C07C31/205Y02P20/584
Inventor 刘平乐吕扬熊伟郝芳冯胜罗和安
Owner XIANGTAN UNIV
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