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Multiwalled carbon nanotube (MCNTs)-supported platinum grease hydrogenation catalyst

A technology for hydrogenation of multi-walled carbon nanotubes and oils, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, fatty acid hydrogenation, etc. The effect of low reduction cost and rich source of raw materials

Inactive Publication Date: 2014-10-15
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the large-scale production of hydrogenated oil in traditional industries mainly uses metal nickel and copper as catalysts. Because nickel-based catalysts are carcinogenic, copper-based catalysts will produce a large amount of trans fatty acids, and the presence of trace amounts of copper will accelerate oil oxidation and rancidity.

Method used

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  • Multiwalled carbon nanotube (MCNTs)-supported platinum grease hydrogenation catalyst
  • Multiwalled carbon nanotube (MCNTs)-supported platinum grease hydrogenation catalyst
  • Multiwalled carbon nanotube (MCNTs)-supported platinum grease hydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Catalyst preparation conditions:

[0025] (1) Activation treatment of carrier MCNTs—weigh about 3 g of carrier multi-walled carbon nanotubes, and perform purification treatment first. MCNTs were placed in a 250 mL round bottom flask, added a certain amount of 68% concentrated nitric acid, stirred at room temperature for 24 h, centrifuged, filtered and washed several times, and dried in an oven at 80 °C for 12 h;

[0026] (2) Oxidation treatment of MCNTs: put the purified MCNTs carrier into a 250 mL round bottom flask after grinding with a mortar, add a certain amount of 34% dilute nitric acid, stir at room temperature for 12 h, centrifuge and filter 1. Wash until neutral, dry in an oven at 80 °C for 12 h, and set aside. The purpose of this process is to use concentrated acid for activation and oxidation to chemically modify the surface of the carrier so that certain functional groups such as carboxyl and hydroxyl groups can be attached to the surface or the inner wall ...

Embodiment 2

[0030] Catalyst effect evaluation experiment of the present invention:

[0031] Hydrogenation process conditions: Measure 300 mL of soybean oil, weigh 150 mg of the catalyst prepared in Example 1 (to ensure that the amount of catalyst is 5%, based on the weight of the raw material oil) and place it in a clean reactor, and put the reaction The kettle was sealed and put on a heating mantle. After the temperature rises to close to the set value of 170 °C, flow nitrogen for 5-10 minutes to remove the oxygen in the kettle, then start to feed pure hydrogen, introduce hydrogen for about 5 minutes to remove the nitrogen in the kettle, and then maintain the hydrogen pressure at 3 bar. Connect condensed water and start the stirring device to maintain the rotation speed at 400 r / min, and record the hydrogenation time as 0 h at this time. Afterwards, samples were taken every 0.5 h, and the co-hydrogenation reaction was carried out for 4 h. The iodine value of the hydrogenated oil samples...

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Abstract

The invention provides a multiwalled carbon nanotube (MCNTs)-supported platinum grease hydrogenation catalyst, belongs to the field of catalysts, and relates to a platinum catalyst loaded on the MCNTs. The catalyst is formed by the active component platinum loaded on the MCNTs, the actual loading amount of platinum is 1.73% (the carrier weight is used as the benchmark), the specific surface area of the catalyst is 412.12 m<2>g<-1>, the specific pore volume is 0.462 cm<3>g<-1>, the average pore diameter is 4.48436 nanometer, and the platinum particle diameter ranges from 2.5 nanometers to 5.5 nanometers. According to the platinum grease hydrogenation catalyst provided by the invention, the preparation technology is classic and simple, the carrier material is novel, and the catalytic activity of the hydrogenated soybean oil is extremely high; moreover, compared with the industrial nickel catalyst, the catalyst provided by the invention has the advantages that less trans fatty acids are generated, the selectivity is good, the quality of the hydrogenated oil is good, and the hydrogenation effect is excellent.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a precious metal-loaded oil hydrogenation catalyst. Background technique [0002] At the beginning of the 20th century, since the German scientist Wilhelm first used a nickel catalyst to hydrogenate oils, the hydrogenation of oils has a history of nearly a hundred years. Hydrogenation has become the most widely used and most important process in the oil modification industry. The demand for hydrogenated oils is also increasing year by year. After hydrogenation of edible oil, it can reduce the unsaturation of oil, increase the melting point, increase the content of solid fat; improve the stability of edible oil to oxygen and heat; improve the color, aroma and taste of edible oil, and expand the use in food Generally, it can be used as the raw material of shortening, margarine or cocoa butter substitute, and has high economic value. [0003] The high temperature, high pressur...

Claims

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Application Information

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IPC IPC(8): B01J23/42C11C3/12
Inventor 陈奕杨希聂少平谢明勇
Owner NANCHANG UNIV
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