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Low metamorphic coal-zirconium-based catalyst as well as preparation method and application thereof

A low metamorphic coal and catalyst technology, applied in catalytic reactions, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of high energy consumption, low utilization rate, inability to effectively utilize oxygen-containing functional groups and low-molecular organic matter and other issues to achieve the effect of good selectivity and high conversion rate

Active Publication Date: 2018-06-01
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pyrolysis upgrading uses high temperature treatment to reduce the water content and volatile component content in coal to obtain high-quality coal char, which usually requires more energy consumption, and at the same time, the oxygen-containing functional groups and low-molecular organic matter in coal are not fully utilized; h 2 O or CO 2 Gasification is to pass water vapor or CO to the coal surface under high temperature conditions. 2 , through reactions such as the water-gas shift to produce H 2 , CO and other useful gases, the main problem of this approach is that the high-temperature reaction destroys the oxygen-containing functional groups or low-molecular substances in coal to a certain extent, so that this part of the structure is not fully utilized
In the prior art, the utilization rate of low-metamorphic coal is low, and the oxygen-containing functional groups and low-molecular organic matter in low-metamorphic coal cannot be effectively utilized.

Method used

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  • Low metamorphic coal-zirconium-based catalyst as well as preparation method and application thereof
  • Low metamorphic coal-zirconium-based catalyst as well as preparation method and application thereof
  • Low metamorphic coal-zirconium-based catalyst as well as preparation method and application thereof

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preparation example Construction

[0023] The invention provides a method for preparing a low-alteration coal-zirconium-based catalyst, comprising the following steps:

[0024] mixing the base material with a sodium hydroxide solution for pretreatment to obtain a base material dispersion, the base material being low metamorphic coal or low metamorphic coal derivatives;

[0025] The pH value of the base material dispersion is adjusted to 2-6, and then mixed with the soluble zirconium salt for coordination and complexation reaction to obtain a low-modification coal-zirconium-based catalyst.

[0026] In the invention, the base material is mixed with the sodium hydroxide solution for pretreatment to obtain the base material dispersion liquid. In the present invention, the base material is low-metamorphic coal or low-metamorphic coal derivatives, and the low-metamorphic coal preferably includes one of lignite raw coal, bituminous coal, sub-bituminous coal, long-flame coal, coking coal and lean coal, more preferably ...

Embodiment 1

[0052] Such as figure 1 As shown, after lignite raw coal or acid-eluted mineral coal is pretreated with NaOH solution, the acidic oxygen-containing functional groups such as carboxyl-COOH and phenolic hydroxyl-OH are transformed into ionic forms-COO - ,-O - , these functional groups are associated with Zr 4+ Coordination complexation occurs, each Zr 4+ Can be complexed with at least four functional groups to form Zr 4+ Centered spatial network structure.

[0053] Specific steps are as follows:

[0054] (1) Lignite raw material preparation: dry lignite raw coal at 100° C. for 24 hours, then pulverize, grind, and sieve to obtain lignite powder with an average particle size of 100-400 mesh.

[0055] (2) The above lignite powder was treated with NaOH solution with a concentration of 0.1 mol / L at 25° C. for 2 h to pH 3-7, and then used for the next reaction.

[0056] (3) coal zirconium reaction: according to ZrCl 4 The mass ratio of the lignite raw material is 0.5:1. Weigh t...

Embodiment 2

[0076] (1) Bituminous coal raw material preparation: dry bituminous coal raw coal at 110°C for 10 hours, then pulverize, grind, and sieve to obtain bituminous coal powder with an average particle size of 150-350 mesh; Remove the inherent minerals in the coal, and then wash it repeatedly with a large amount of deionized water to remove excess Cl - , and then proceed to the next step of NaOH treatment.

[0077] (2) The above acid-washed coal samples were treated with 0.5mol / L NaOH solution at 25°C for 5h to pH 3-7, and then used for the next reaction.

[0078] (3) coal zirconium reaction: according to ZrOCl 2 ·8H 2 The mass ratio of O to bituminous coal raw material is 7:1. Weigh the zirconium salt and dissolve it in 100mL deionized water. Slowly add the suspension of the above bituminous coal raw material into the zirconium salt solution, and stir and react at 60°C for 2h.

[0079] (3) Filtration and washing: After the reaction is over, filter the suspension obtained from th...

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Abstract

The invention provides a preparation method of a low metamorphic coal-zirconium-based catalyst, and belongs to the technical field of coal utilization. The method comprises the following preparation steps: low metamorphic coal powder is mixed with a sodium hydroxide solution for pretreatment to obtain a low metamorphic coal dispersion liquid; the pH of the low metamorphic coal dispersion liquid isadjusted to 2 to 6 and mixed with a soluble zirconium salt to conduct coordinated complexation reaction, and to obtain the low metamorphic coal-zirconium-based catalyst. In view of unique compositionand structural characteristics of low metamorphic coal, rich oxygen-containing functional groups and organic acids of the low metamorphic coal can be fully used for achieving the use of the low metamorphic coal under mild conditions, and at the same time the added value of the product is further increased. The low metamorphic coal-zirconium-based catalyst obtained by the invention is used for catalyzing selective hydrogenation of ketone or aldehyde compound.

Description

technical field [0001] The invention relates to the technical field of coal utilization, in particular to a low-modified coal-zirconium-based catalyst and its preparation method and application. Background technique [0002] Coal resources play an irreplaceable role in global social and economic development. Energy and abundant chemicals can be obtained from coal to meet the needs of human society for energy and various materials. my country has abundant coal reserves, among which low-rank coal represented by lignite occupies an important proportion. With the rapid development of my country's social economy, my country's coal consumption continues to increase, resulting in an increase in the consumption of high-rank coal and a rapid decline in recoverable reserves. Therefore, in the long run, while saving the mining and utilization of high-rank coal, it is necessary to gradually increase the proportion of low-rank coal in coal consumption and further improve the utilization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J31/04C07D307/33C07D307/44C07C31/125C07C29/14C07C35/08C07B41/02
CPCB01J31/04B01J31/38B01J2231/643C07B41/02C07C29/14C07D307/33C07D307/44C07C31/125C07C35/08
Inventor 周华从刘全生张彬彬肖贞环郝建秀沙宇飞
Owner INNER MONGOLIA UNIV OF TECH
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