Lignite coke loaded nano-cobalt composite catalyst and preparation method thereof

A composite catalyst, nano-cobalt technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of catalyst deactivation and preparation cost, and achieve high added value utilization and high specific surface area. , the effect of low price

Active Publication Date: 2020-07-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention aims to propose a preparation method of lignite coke-loaded nano-cobalt composite catalyst to solve the problem of existing CO 2 The reaction between the active metal and the oxide support in the methanation catalyst will easily lead to the deactivation of the catalyst and the high cost of preparation

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  • Lignite coke loaded nano-cobalt composite catalyst and preparation method thereof
  • Lignite coke loaded nano-cobalt composite catalyst and preparation method thereof
  • Lignite coke loaded nano-cobalt composite catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] A lignite coke-loaded nano-cobalt composite catalyst, which is specifically prepared by the following method:

[0036] 1) crushing and sieving the original lignite block to obtain lignite particles;

[0037] 2) Weigh 2g of lignite particles and disperse them into 100g of ethanol. After ultrasonic dispersion treatment for 5min, add 4.93g of Co(NO 3 ) 2 Ethanol solution (20wt%), wherein, Co(NO 3 ) 2 The feed ratio of cobalt and lignite particles in the ethanol solution is 10wt%, and the ultrasonic dispersion treatment is continued for 5 minutes; the mixed solution obtained by ultrasonic dispersion is transferred to the stirrer, and stirred in a water bath at 45° C. for 2 hours, so that most of the ethanol is volatilized. Cool down to room temperature, continue to stir until the ethanol is completely volatilized, and then vacuum-dry at 45°C for 10 hours to obtain solid substance A;

[0038] 3) The solid material A was pyrolyzed at 700° C. for 2 h under an Ar atmosphere...

Embodiment 2

[0049] A lignite coke-loaded nano-cobalt composite catalyst, which is specifically prepared by the following method:

[0050] 1) crushing and sieving the original lignite block to obtain lignite particles;

[0051] 2) Weigh a certain amount of lignite particles, add them to 2mol / L nitric acid solution, stir in a water bath at 50°C for 2 hours, filter the mixture with suction, wash with deionized water several times, and place the solid sample obtained after washing at 120 Drying at ℃ to obtain acid-washed lignite particles;

[0052] 3) Weigh 2g of acid-washed lignite particles and disperse them into 100g of ethanol. After ultrasonic dispersion treatment for 5min, add 4.93g of Co(NO 3 ) 2 Ethanol solution (20wt%), wherein, Co(NO 3 ) 2 The feed ratio of cobalt and lignite particles in the ethanol solution is 10wt%, and the ultrasonic dispersion treatment is continued for 5 minutes; the mixed solution obtained by ultrasonic dispersion is transferred to the stirrer, and stirre...

Embodiment 3

[0064] The difference between this embodiment and Example 2 is: in the preparation process of the lignite coke-loaded nano-cobalt composite catalyst of the present embodiment, Co(NO 3 ) 2 The add-on of ethanol solution (20wt%) is 2.47g, at this moment, Co(NO 3 ) 2 The feed ratio of cobalt in the ethanol solution to the acid-washed lignite particles is 5wt%, and the others are the same as in Example 2.

[0065] The TEM test and cobalt particle size statistics of the lignite coke-supported nano-cobalt composite catalyst in this embodiment were carried out.

[0066] It can be known from tests that the average size of cobalt particles in the lignite coke-supported nano-cobalt composite catalyst of this embodiment is 5 nm.

[0067] O 2 TG test of atmosphere.

[0068] It can be seen from the calculation of the test results that the cobalt loading amount (cobalt: lignite coke) in the lignite coke-supported nano-cobalt composite catalyst of this embodiment is 9 wt%.

[0069] Nit...

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Abstract

The invention provides a lignite coke loaded nano-cobalt composite catalyst and a preparation method thereof. According to the preparation method, lignite is used as a carrier raw material, cobalt salt is used as an active metal precursor, the feeding ratio of cobalt to lignite in the cobalt salt is 5wt%-15wt%, and the lignite coke loaded high-dispersion nano-cobalt composite catalyst is synthesized through a modified impregnation method and high-temperature pyrolysis. The composite catalyst prepared by the invention has a hierarchical pore structure and a high specific surface area, nano cobalt is uniformly dispersed on the lignite coke, and the particle size is controllable, so that the obtained catalyst has excellent low-temperature CO2 methanation catalytic activity, and the preparation process is simple, the raw materials are cheap and easily available, and the composite catalyst is very suitable for industrial production and application.

Description

technical field [0001] The present invention relates to CO 2 The technical field of methanation catalysts, in particular, relates to a lignite coke-loaded nano-cobalt composite catalyst and a preparation method thereof. Background technique [0002] CO 2 The greenhouse effect caused by excessive emissions is one of the environmental problems that need to be solved urgently. will CO 2 Capture, storage and transformation are CO 2 An important topic of comprehensive management and utilization. CO 2 It is a carbon source itself, and CO can be converted by hydrogenation 2 into a variety of useful chemical raw materials and fuels (including CH 4 , CO, CH 3 OH, HCOOH, etc.). CO 2 Hydrogenation to methane is the most promising CO 2 One of the conversion technologies, its product methane can be directly added to the natural gas network as a fuel, or used as a raw material to produce other chemical products. CO 2 Hydrogenation to CH 4 also known as CO 2 Methanation reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/10B01J35/02C07C1/12C07C9/04
CPCB01J23/75B01J35/10B01J35/023B01J35/1019C07C1/12C07C9/04B01J35/0013B01J37/0207B01J35/002B01J37/343B01J37/082B01J35/1038B01J21/18B01J37/0036B01J37/0203B01J37/0236B01J37/088
Inventor 赵春霞李锋陈文金伟祁琰媛杨爽
Owner WUHAN UNIV OF TECH
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