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Direct coal liquefaction catalytic additive, preparation method and application of direct coal liquefaction catalytic additive

A technology for direct liquefaction of coal and additives, applied in the field of coal liquefaction, can solve the problems of deviation of the catalytic reaction from the set reaction conditions, long time to reach the required temperature, uneven heating, etc., the preparation method is simple and cheap, and the probability of occurrence is reduced. , the effect of improving the conversion rate of coal liquefaction

Active Publication Date: 2014-10-08
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The driving force of conventional electric heating is the temperature difference in the direction of heat flow. First, the surface of the object is heated, and then the temperature inside the object is gradually increased by heat conduction. Therefore, electric heating will cause the entire system to be heated unevenly and it will take longer to reach the required temperature. long
In addition, conventional electric heating has a certain hysteresis, which will cause the catalytic reaction to deviate from the set reaction conditions during the heating process, resulting in certain errors
Therefore, the evaluation of coal liquefaction hydrogenation reaction by electric heating has certain limitations.

Method used

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  • Direct coal liquefaction catalytic additive, preparation method and application of direct coal liquefaction catalytic additive
  • Direct coal liquefaction catalytic additive, preparation method and application of direct coal liquefaction catalytic additive
  • Direct coal liquefaction catalytic additive, preparation method and application of direct coal liquefaction catalytic additive

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Embodiment 1

[0031] In this embodiment, first weigh 50 g Ni (NO 3 ) 2 ·6H 2 O was fully dissolved in 50g distilled water, and then evenly impregnated onto 50g NaY molecular sieve. Then dry at 105°C for 12 hours, grind to below 150um, put it into a muffle furnace and bake at 450°C for 5 hours, and cool naturally to obtain Ni / NaY catalyst. Put the Ni / NaY catalyst sample into a quartz tube and adjust the nitrogen flow rate to 10 mL min -1 , the tube furnace was heated to 850°C by microwave, and diethylamine gas was introduced at the same time, and the temperature was kept at a constant temperature for 2 hours. After natural cooling, nickel nitrate was loaded on the obtained nitrogen-doped carbon nanotubes CNx by impregnation method, and the nickel nitrate solution was evenly impregnated. in doped carbon nanotubes CNx, then dried in an oven at 100 °C for 24 h, and then in N 2 The Ni / CNx composite catalytic additive was obtained after roasting at 450°C for 4h under protection and cooling na...

Embodiment 2

[0037] In this example, the tube furnace was heated to 1000° C. by microwave and kept at a constant temperature for 0.5 h. In addition, the method for preparing the Ni / CNx composite catalytic additive was consistent with Example 1.

[0038] In the hydrogenation reaction, the autoclave was heated by microwaves at a constant temperature of 400° C. and a hydrogen pressure of 15 MPa for 1 hour. Other than that, other conditions and methods were consistent with those of the hydrogenation reaction in Example 1. Through analysis, in the hydrogenation reaction of this example, the coal liquefaction conversion rate is 86.17%, the gas yield rate is 15.47%, the bitumen yield rate is 13.85%, and the liquefied oil yield rate is 48.46%.

Embodiment 3

[0040] In this embodiment, the organic amine is triethylamine gas. In addition, the method for preparing the Ni / CNx composite catalytic additive is consistent with that in Example 1.

[0041] Ni / CN in hydrogenation reaction x The amount of composite catalyst added was 0.36g, and the autoclave was heated by microwaves at 400°C and hydrogen pressure of 15 MPa for constant temperature reaction for 1 hour. Other than that, other conditions and methods were consistent with those of the hydrogenation reaction in Example 1. Through analysis, in the hydrogenation reaction of this example, the coal liquefaction conversion rate is 87.28%, the gas yield rate is 13.72%, the bitumen yield rate is 11.12%, and the liquefied oil yield rate is 53.23%.

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Abstract

The invention belongs to the technical field of coal liquefaction, and particularly relates to a direct coal liquefaction catalytic additive, a preparation method and application of the direct coal liquefaction catalytic additive. The preparation method comprises the following steps: firstly, dipping soluble nickel salt on a molecular sieve; then treating by microwave heating in a tube furnace, meanwhile introducing a protective atmosphere and organic amine mixed gas to obtain a nitrogen-doped carbon nano-tube CNx; and then loading nickel salt on the nano-tube to finally obtain a composite catalytic additive which can be expressed as Ni / CNx. The catalytic additive has relatively high hydrogenation activity and selectivity as well as efficient microwave absorbing capability, and after a trace amount of the catalytic additive is added into coal liquefaction and hydrogenation reaction, the hydrogenation effect of coal liquefaction reaction can be effectively improved, and the conversion efficiency of coal can be improved. While in hydrogenation reaction, by adopting microwave heating, the reaction speed can be increased, and the reaction efficiency can be improved.

Description

technical field [0001] The invention belongs to the field of coal liquefaction, and in particular relates to a catalytic additive for direct coal liquefaction, a preparation method and a hydrogenation reaction thereof. Background technique [0002] The direct liquefaction of coal to produce liquid fuel is an important way for clean coal conversion and high-efficiency utilization, and it is also an energy strategic reserve technology developed for my country's national conditions of more coal and less oil. Coal direct liquefaction is a clean coal technology that converts coal into liquid products by using hydrogen-donating solvents and catalysts to allow hydrogen to enter the molecular structure of coal and its derivatives under high temperature and high pressure conditions. It is a complex process. The physical and chemical reaction process, its influencing factors mainly include: the type and nature of coal, catalyst, solvent, reaction temperature and time, atmosphere, etc....

Claims

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Application Information

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IPC IPC(8): B01J27/24C10G1/06B82Y30/00B82Y40/00
Inventor 王利军刘旗
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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