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Preparation method of efficient Co/CNTs catalyst for Fischer-Tropsch synthesis reaction

A catalyst and Tropor synthesis technology, which is applied in the field of preparation of high-efficiency Co/CNTs catalysts, can solve the problems of poor catalyst stability, easy sintering, and increased costs, and achieve high reducibility, improved reaction activity, and high selectivity.

Active Publication Date: 2020-03-27
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for preparing a high-efficiency Co / CNTs catalyst for Fischer-Tropsch synthesis by using glow discharge plasma in an inert atmosphere. atmosphere, to prepare Co / CNTs catalysts with significantly increased activity and better reaction stability. On the one hand, it is used to solve the problem of introducing noble metal additives to maintain the reduction performance of active metals and increase costs while introducing glow discharge plasma technology. On the other hand, it also solves the technical problems of poor catalyst stability and easy sintering during the reaction process of traditional plasma preparation of cobalt-based Fischer-Tropsch synthesis catalysts.

Method used

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  • Preparation method of efficient Co/CNTs catalyst for Fischer-Tropsch synthesis reaction
  • Preparation method of efficient Co/CNTs catalyst for Fischer-Tropsch synthesis reaction

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Effect test

Embodiment 1

[0033] A preparation method for an efficient Co / CNTs catalyst for Fischer-Tropsch synthesis reaction, the steps are as follows:

[0034] (1) Pretreatment of carrier CNTs:

[0035] Put 2g of CNTs in a 250mL round-bottomed flask equipped with a reflux trap and a condenser tube, and add 200mL of 65wt.% HNO to it 3 , then heated and refluxed at 80°C for 6h under stirring at 20rpm, after the temperature dropped to room temperature, vacuum filtered, and the obtained solid was repeatedly washed with deionized water until neutral, dried in an oven at 100°C for 12h, and cooled After reaching room temperature, it is ground into powder to obtain the pretreated CNTs carrier;

[0036] (2) Preparation of Co / CNTs by equal volume impregnation method:

[0037] According to the theoretical loading of Co on the carrier CNTs is 15%, weigh 1.74g of cobalt nitrate hexahydrate and dissolve it in 6.3mL of deionized water, then add the aqueous solution of cobalt nitrate dropwise into the equipment p...

Embodiment 2

[0046] Different inert atmosphere (N 2 , Ar) Co / CNTs-PN and Co / CNTs-PAr catalysts prepared by plasma and Co / CNTs-CN and Co / CNTs-CAr catalysts prepared by impregnation and direct roasting were applied to catalyze the Fischer-Tropsch synthesis reaction and react Stability testing.

[0047] The experiment was carried out in a fixed-bed reactor, first reduced under pure hydrogen atmosphere, reduction conditions: normal pressure, under hydrogen atmosphere, 4SL·g -1 h -1 , reduced at 400°C for 10h; after cooling down, switch to syngas for reaction, reaction conditions: space velocity 4SL·g -1 h -1 , 1.0MPa, T=200℃, H 2 / CO=2:1 (volume ratio).

[0048] The performance of each catalyst in catalyzing Fischer-Tropsch synthesis is shown in Table 1 and Figure 5 As shown, the reaction data taken in Table 1 is the average activity data of 100 h after reaching the reaction temperature of 200 ° C and stabilizing.

[0049] It can be seen that the Fischer-Tropsch synthesis reaction acti...

Embodiment 3

[0054] A preparation method for an efficient Co / CNTs catalyst for Fischer-Tropsch synthesis reaction, the steps are as follows:

[0055] (1) Pretreatment of carrier CNTs:

[0056] Put 2g of CNTs in a 250mL round-bottomed flask equipped with a reflux trap and a condenser tube, and add 200mL of 65wt.% HNO to it 3 , and then heated and refluxed at 80°C for 6h under stirring at 20rpm. After the end, the temperature dropped to room temperature, vacuum filtered, and the obtained solid was repeatedly washed with deionized water until neutral, then dried in an oven at 100°C for 12h, and cooled to Grinding into powder after room temperature to obtain pretreated CNTs carrier;

[0057] (2) Preparation of Co / CNTs by equal volume impregnation method:

[0058] According to the theoretical loading of Co on the carrier CNTs is 15%, weigh 1.74g of cobalt nitrate hexahydrate and dissolve it in 6.3mL of deionized water, then add the aqueous solution of cobalt nitrate dropwise into the pretreat...

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Abstract

The invention relates to the technical field of nano catalysts, in particular to a preparation method of an efficient Co / CNTs catalyst for a Fischer-Tropsch synthesis reaction. The glow discharge plasma is introduced into the preparation of a supported Co / CNTs catalyst to explore the influence of plasma treatment in different inert atmospheres on the Fischer-Tropsch synthesis catalytic performance. Research results show that the Co / CNTs catalyst is treated by the inert atmosphere plasma, the reduction performance is improved while high dispersion of cobalt is kept on the premise that preciousmetal auxiliaries are not added for modification, and higher (3-4 times) Fischer-Tropsch synthesis reaction activity is shown in comparison with the sample obtained through the corresponding traditional roasting method. Particularly, the Co / CNTs catalyst is treated by adopting argon plasma, the catalyst also shows the optimal reaction stability while showing the optimal Fischer-Tropsch synthesis reaction activity and obvious inactivation does not occur in a 100h reaction.

Description

technical field [0001] The invention relates to the technical field of nanometer catalysts, in particular to a method for preparing a high-efficiency Co / CNTs catalyst for Fischer-Tropsch synthesis reaction. Background technique [0002] In recent years, facing the increasingly prominent contradiction between the world's energy supply and demand, coupled with the corresponding environmental pollution problems, the Fischer-Tropsch synthesis technology to realize the efficient conversion and utilization of carbon resources has attracted widespread attention. The indirect liquefaction process based on Fischer-Tropsch synthesis technology can indirectly convert carbon-based raw materials such as coal, natural gas, and biomass into ultra-clean fuels and high value-added chemicals through synthesis gas. One of the best ways to buy products. [0003] Cobalt catalyst is one of the commonly used Fischer-Tropsch synthesis catalysts because of its high reactivity and strong chain growt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J37/34C10G2/00
CPCB01J23/75B01J37/349C10G2/332
Inventor 洪景萍韩瑶瑶李金林张煜华
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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