Atomic-scale dispersed palladium-based nanometer diamond/graphene composite material catalyst, preparation method and applications thereof

A nano-diamond and composite material technology, which is applied in the field of atomically dispersed palladium-based nano-diamond/graphene composite material catalyst and its preparation, can solve problems such as loss and environmental pollution, and achieve good stability, environmental friendliness and high stability. Effect

Active Publication Date: 2019-01-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lindlar catalyst contains sulfur and lead components, which will be lo...

Method used

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  • Atomic-scale dispersed palladium-based nanometer diamond/graphene composite material catalyst, preparation method and applications thereof
  • Atomic-scale dispersed palladium-based nanometer diamond/graphene composite material catalyst, preparation method and applications thereof
  • Atomic-scale dispersed palladium-based nanometer diamond/graphene composite material catalyst, preparation method and applications thereof

Examples

Experimental program
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Embodiment 1

[0036] Put 200mg of nanodiamond / graphene carrier in a 100mL round bottom flask with 30mL of water, and after ultrasonic dispersion, adjust the pH value to 10 with 0.25mol / L sodium carbonate solution to obtain nanodiamond / graphene carrier dispersion. Calculate the amount of palladium nitrate solution according to the loading capacity of 0.1wt%, then weigh the required amount of palladium nitrate solution and adjust the pH value to 7 with 0.25mol / L sodium carbonate solution, then add the palladium nitrate solution to the nanodiamond / graphene carrier solution in an oil bath at 100° C. for 1 hour, then cooled to room temperature, suction filtered, and washed to obtain a palladium-based nanodiamond / graphene composite catalyst precursor. Then 30 mg of palladium-based nano-diamond / graphene composite catalyst precursor was placed in a quartz tube, and treated with a mixed gas of hydrogen and helium (hydrogen and helium volume ratio 1:1) at a flow rate of 20 mL / min at 150 ° C for 1 hour...

Embodiment 2

[0038]The catalysts obtained in Example 1 and Comparative Example 1 were added to the fixed-bed reactor. The mixed raw material gas is: 1% acetylene, 10% hydrogen, 20% ethylene, helium as the balance gas, the space velocity is 60000mL / g h, and the percentage is volume percentage, catalyzing the hydrogenation of acetylene to generate ethylene, the catalyst The use temperature is 80°C-200°C; the reaction product is detected by gas chromatography analysis. Among them, Pd clusters / ND@G has no ethylene catalytic selectivity, while atomically dispersed Pd 1 / ND@G has 100% acetylene conversion and 90% ethylene selectivity at 180°C. The performance of the catalyst does not decrease significantly when it is continuously used for 30 hours, indicating that the atomically dispersed nano-diamond / graphene catalyst prepared by the method of the present invention can obviously obtain higher acetylene catalytic reaction activity and ethylene selectivity.

[0039] Correct the transmission ele...

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Abstract

The invention discloses an atomic-scale dispersed palladium-based nanometer diamond/graphene composite material catalyst, a preparation method and applications thereof, and belongs to the technical field of catalysts for selective hydrogenation reactions of acetylene, wherein nanometer diamond is subjected to high temperature calcination treatment in an inert atmosphere to obtain a nanometer diamond/graphene structure carbon material, and palladium is dispersed and fixed in the graphene shell layer in an atomic form. According to the present invention, the catalyst hydrogenates acetylene to generate ethylene in a mixed raw material gas, wherein the use temperature of the catalyst is 80-200 DEG C; by dispersing palladium on the nanometer diamond/graphene material in an atomic scale manner,the atomic-scale dispersed palladium-based nanometer diamond/graphene composite material catalyst can effectively catalyze the conversion of acetylene into ethylene and has significantly improved acetylene hydrogenation selectivity compared to the traditional palladium-based carbon materials and the commercial palladium catalysts, has good stability, and is not easily deactivated during the reaction.

Description

technical field [0001] The invention relates to the technical field of acetylene hydrogenation reaction catalysts, in particular to an atomically dispersed palladium-based nano-diamond / graphene composite catalyst and its preparation method and application. Background technique [0002] Ethylene (C 2 h 2 ) as a product of petroleum cracking, is an important basic chemical raw material for synthetic plastics, fibers, and rubber, and is widely used. However, ethylene raw materials usually contain a small amount of acetylene. The presence of acetylene not only affects the construction of polymer chains and polymerization rate during free radical polymerization, reduces the quality of polymer products, but also poisons the catalyst of polymerization reaction. Therefore, the selective hydrogenation of acetylene to prepare ethylene is of great significance in the production process of fine chemical industry and polymer industry. [0003] Catalysts for the selective hydrogenation...

Claims

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Application Information

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IPC IPC(8): B01J23/44C07C5/09C07C11/04
CPCB01J23/44B01J35/006B01J35/0073C07C5/09C07C11/04Y02P20/52
Inventor 刘洪阳黄飞
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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