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Preparation method and application of a platinum-tungsten catalyst co-modified by activated carbon supported Cu and Al

A catalyst and activated carbon technology, applied in the field of preparation of platinum-tungsten catalysts, can solve the problems of harsh reaction conditions, high hydrogen consumption, and high cost of glycerol hydrogenation catalysts, achieve short reaction time, good recycling effect, and improve process production conditions Effect

Active Publication Date: 2020-07-10
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 in the prior art, harsh reaction conditions and large hydrogen consumption, the present invention provides a platinum-tungsten catalyst (Cu-Al-Pt -WO x / AC) preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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;

[0032] Weigh 2 g of activated carbon (AC) into a 50 mL round-bottomed flask, add 16 mL of deionized water at a solid-to-liquid mass ratio of 1:8, and stir ultrasonically for 1 hour with an ultrasonic instrument. Add 0.25g of ammonium metatungstate to the above deionized aqueous solution, heat to 90°C in an oil bath, stir for 15min, and after cooling to room temperature, add 12ml of the prepared solution (the mass ratio of solid to liquid is 1:100 ) chloroplatinic acid aqueous solution, th...

Embodiment 2

[0034] Weigh 0.1 gram of Cu-Al-Pt-WO obtained in Example 1 x / AC catalyst is placed in a 50mL micro-autoclave, add 12mL deionized water, 1.2g glycerin, add 0.21g levulinic acid, put a magnet, seal the autoclave, replace the air in the autoclave with nitrogen for 3 times, The vacuum pump pumps the kettle to vacuum, 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 46.62%, and the selectivity of 1,3-propanediol was 32.34%.

Embodiment 3

[0036] Weigh 0.1 gram of Cu-Al-Pt-WO obtained in Example 1 x / AC catalyst is placed in a 50mL micro-autoclave, add 12mL deionized water, 1.2g glycerin, add 0.21g levulinic acid, put a magnet, seal the autoclave, replace the air in the autoclave with nitrogen for 3 times, The vacuum pump pumps the kettle to vacuum, 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 50.32%, and the selectivity of 1,3-propanediol was 36.12%.

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Abstract

The invention discloses a preparation method of a platinum-tungsten catalyst co-modified with Cu and Al supported on activated carbon and application. The preparation method comprises the steps that an ammonium metatungstate solution is firstly added into activated carbon dispersion liquid, then a certain amount of aqueous chloroplatinic acid solution is added, and then a nitrate precursor is added in a certain proportion, and after reaction is completed, drying, calcining and reducing are conducted to obtain the catalyst, that is, Cu-Al-Pt-WOx / AC. The preparation method is simple, the catalyst needed can be obtained by one-time impregnation method, an carrier is cheap and easy to be obtained, cost is greatly reduced, recycling effect is good, the obtained catalyst is used for hydrogenation reaction of glycerin, reaction time is short, the reaction is economic, effective, and environment-friendly, hydrogen consumption is low, products are easy to be separated, high conversion rate of glycerol and 1,3-propanediol selectivity under relatively mild reaction conditions are high, production conditions are improved, and 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 platinum-tungsten catalyst supported by activated carbon and co-modified by Al. 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 raw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J35/10C07C29/60C07C31/20
CPCB01J23/8993C07C29/60C07C31/205
Inventor 刘平乐冯胜熊伟郝芳吕扬罗和安
Owner XIANGTAN UNIV
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