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A preparation method of ultrafine modified fly ash-graphene oxide-palladium hydrogenation catalyst

A hydrogenation catalyst, ultra-fine fly ash technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, organic compound/hydride/coordination complex catalyst, etc. Single, complex preparation of the carrier, high cost, to achieve the effect of improving the catalytic effect, facilitating the popularization and application, and reducing the cost of use

Active Publication Date: 2020-05-22
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201510101178.X discloses a method for preparing a supported Pd catalyst with nano-carbon as a carrier. The supported Pd catalyst with nano-carbon as a carrier is composed of a nano-carbon carrier, a polymer coating on the surface of a nano-carbon carrier and Composed of Pd nanoparticles distributed on the surface of the polymer coating layer, this method has a good catalytic effect, but the preparation of the carrier is complicated and the application is not ideal
[0007] On the whole, the existing palladium-carbon catalyst carrier selection is relatively simple, ordinary Al 2 o 3 , SiO 2 Catalysts such as activated carbon and molecular sieve have a large specific surface area, and it is difficult to ensure the stable existence of highly dispersed Pd; using graphene alone as a carrier has a good catalytic effect, but the cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of superfine modified fly ash-graphene oxide-palladium hydrogenation catalyst, comprises the steps:

[0029] (1) Take 50g of fly ash (can be taken from a thermal power plant) and place it in a planetary ball mill, set the speed of the planetary ball mill to 350rad / min, the mass ratio of the ball to ash is 2:1, the ball milling time is 8h, and the amount of surfactant added is 0.5g (Lauryl alcohol polyoxyethylene methyl-terminated polyether 0.1g; sodium dodecylbenzenesulfonate 0.05g triisopropanolamine 0.1g, N,N-dimethylethanolamine 0.05g; Tween-80,0.05 g; nonylphenol polyoxyethylene ether 0.15g).

[0030] (2) Take 20g of water and gradually add 5gNa 2 SiO 39H 2 O and 5gKOH, after the dissolution is complete, pour it into the blender. At this point, add 50 g of ultrafine fly ash obtained in step (1), start the agitator to stir at a slow speed for 3 minutes, then stir rapidly for 5 minutes, and obtain a uniform ultrafine fly ash slurry at ...

Embodiment 2

[0033] A kind of preparation method of superfine modified fly ash-graphene oxide-palladium hydrogenation catalyst, comprises the steps:

[0034] (1) Put 100g of fly ash in the planetary ball mill, set the speed of the planetary ball mill to 400rad / min, the ball-to-ash ratio to 3:1, the ball milling time to 10h, and the addition of surfactant to be 2g (polyoxyethylene lauryl alcohol methyl Capped polyether 0.6g; sodium dodecylbenzenesulfonate 0.2g triisopropanolamine 0.3g, Tween-80, 0.6g; nonylphenol polyoxyethylene ether 0.3g).

[0035] (2) Take 30g of water and gradually add 15gNa 2 SiO 3 9H 2 O and 8gKOH, after the dissolution is complete, pour it into the blender. At this point, add 100 g of ultrafine fly ash obtained in step (1), start the agitator to stir at a slow speed for 3 minutes, and then stir rapidly for 6 minutes. After the stirring is completed, a uniform ultrafine fly ash slurry is obtained at this time.

[0036] (3) The superfine fly ash slurry obtained in ...

Embodiment 3

[0038] A kind of preparation method of superfine modified fly ash-graphene oxide-palladium hydrogenation catalyst, comprises the steps:

[0039] (1) Put 200g of fly ash in the planetary ball mill, set the speed of the planetary ball mill to 350rad / min, the ball-to-ash ratio to 3:1, the ball milling time to 12h, and the addition of surfactant to be 8g (polyoxyethylene lauryl alcohol methyl Blocked polyether 3.2g; Sodium dodecylbenzenesulfonate 0.8g Triisopropanolamine 1.2g, Tween-80, 2.0g; Nonylphenol polyoxyethylene ether 0.8g).

[0040] (2) Take 80g of water and gradually add 20gNa 2 SiO 3 9H 2 O and 12gKOH, after the dissolution is complete, pour it into the mixer. At this point, add 200g of ultrafine fly ash obtained in step (1), start the agitator to stir at a slow speed for 4 minutes, and then stir rapidly for 6 minutes. After the stirring is completed, a uniform ultrafine fly ash slurry is obtained at this time.

[0041] (3) Add the superfine fly ash slurry obtained ...

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Abstract

The invention belongs to the technical field of a hydrogenation catalyst and particularly relates to a preparation method of an ultrafine modified coal ash-graphene oxide-palladium hydrogenation catalyst. According to the method, ultrafine modified coal ash serves as a main carrier, a proper amount of surfactant is added, fatty alcohol polyoxyethylene methyl terminated polyether and oleic acid serve as palladium salt catalysts, the palladium salt can be dispersed and adsorbed on the surface of the carrier uniformly and a multi-catalytic center is convenient to form, so that the whole catalyticeffect of the catalyst is improved. According to the scheme, the catalyst cost can be greatly reduced; meanwhile, a small amount of graphene oxide is taken part in, the palladium catalyst can complete hydrogenation reaction at low temperature, and remarkable cost and technological advantages are achieved, so that the method is a method with huge potential in the preparation methods of the palladium carbon catalyst.

Description

technical field [0001] The invention relates to the technical field of hydrogenation catalyst and its preparation, in particular to a method for preparing an ultrafine modified fly ash-graphene oxide-palladium hydrogenation catalyst. Background technique [0002] Palladium hydrogenation catalyst occupies an important position in the field of heterogeneous catalysis because of its excellent catalytic activity and selectivity. It is a more effective way to disperse nano-Pd through the carrier, and use the force between the carrier and Pd to prevent the agglomeration of nanoparticles and increase the recovery rate. The carriers currently studied mainly include: Al 2 o 3 , SiO 2 , activated carbon, molecular sieve, etc. However, the presence of the carrier will affect the diffusion of reactants and products and reduce the reaction rate. Therefore, in order to give full play to the unique catalytic properties of nano-Pd, it is necessary not only to ensure the stable existenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J21/04B01J32/00B01J27/25B01J27/13B01J31/02B01J37/34C07C5/03C07C13/18
CPCB01J21/04B01J23/44B01J27/13B01J27/25B01J31/02B01J37/343C07C5/03C07C13/18
Inventor 唐楷颜杰柯顺永项元柱孙益华许显成
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING