Catalyst for improving content of cycloalkane in tar through microwave pyrolysis of low-rank coal as well as preparation method and application of catalyst

A low-rank coal and cycloalkane technology, applied in the field of microwave catalytic pyrolysis of low-rank coal, can solve the problems of catalyst deactivation, unfavorable tar formation, and high price of molecular sieves

Active Publication Date: 2021-04-20
WUHAN UNIV OF SCI & TECH +1
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Problems solved by technology

Studies have shown that catalysts suitable for microwave pyrolysis of low-rank coal include metal catalysts, molecular sieve catalysts, and carbon-based catalysts. Among them, molecular sieve catalysts and carbon-based catalysts have rich physical pore structures and large specific surface areas. , so it is often used as a catalyst carrier, but molecular sieves are expensive, and it is easy to deactivate the catalyst due to carbon on the surface of the catalyst; metal catalysts include alkali metals and alkaline earth metals, transition metals, iron-based catalysts and natural minerals, but alkali metals will be in the catalyst. Cross-linking with coal molecules during pyrolysis is not conducive to the formation of tar; iron-based catalysts and some transition metals synthesized by general methods can promote the yield of microwave pyrolysis tar, but most of them can promote the production of benzene series , while the promotion effect on the formation of naphthenes is very weak

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  • Catalyst for improving content of cycloalkane in tar through microwave pyrolysis of low-rank coal as well as preparation method and application of catalyst

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preparation example Construction

[0039] The present invention provides a method for preparing a catalyst for increasing the content of naphthenes in tar by microwave pyrolysis of low-rank coal described in the above technical solution, comprising the following steps:

[0040] mixing the metal salt corresponding to the catalytically active substance and the metal salt corresponding to the cocatalyst with water to obtain a metal salt solution;

[0041] mixing the metal salt solution with an aqueous solution of sodium dodecylbenzenesulfonate, adjusting the pH value to 9-10 to obtain a suspension;

[0042] The suspension is separated, and the obtained solid deposit is first calcined to obtain a nanocatalyst precursor;

[0043] The nano-catalyst precursor is mixed with the catalyst carrier and the dispersant, and dispersed, and the resulting dispersion is subjected to microwave irradiation and second roasting in sequence to obtain a catalyst for increasing the content of cycloalkane in tar by microwave pyrolysis o...

Embodiment 1

[0087]2.9081g (0.01mol) Ni(NO 3 ) 2 ·6H 2 O, 1.2080g (0.005mol) Cu(NO 3 ) 2 ·3H 2 O was added to 100mL of deionized water, stirred until completely dissolved to obtain a metal salt solution, dissolved in 100mL of deionized water with 0.1163g of sodium dodecylbenzenesulfonate and stirred until completely dissolved to obtain an aqueous solution of sodium dodecylbenzenesulfonate (1.163g / L), the metal salt solution and the sodium dodecylbenzenesulfonate aqueous solution are stirred and mixed evenly at 80°C, and 3mol / L potassium hydroxide solution is added dropwise in the resulting mixed solution to adjust the pH =10, continuously stirred at 200rpm at 80°C for 2h to obtain a suspension, centrifuged the suspension, washed the obtained solid product with deionized water and ethanol repeatedly, and suction filtered until pH=7, Put the obtained solid deposit into an oven at 110°C for 2 hours, cool it to room temperature, put it into a muffle furnace and raise the temperature to 60...

Embodiment 2

[0090] 2.9081g Ni(NO 3 ) 2 ·6H 2 O, 2.4160g Cu(NO 3 ) 2 ·3H 2 O was added to 100mL of deionized water, stirred until completely dissolved to obtain a metal salt solution, dissolved in 100mL of deionized water with 0.1163g of sodium dodecylbenzenesulfonate and stirred until completely dissolved to obtain an aqueous solution of sodium dodecylbenzenesulfonate (1.163g / L), the metal salt solution and the sodium dodecylbenzenesulfonate aqueous solution are stirred and mixed evenly at 80°C, and 3mol / L potassium hydroxide solution is added dropwise in the resulting mixed solution to adjust the pH =10, continuously stirred at 200rpm at 80°C for 2h to obtain a suspension, centrifuged the suspension, washed the obtained solid product with deionized water and ethanol repeatedly, and suction filtered until pH=7, Put the obtained solid deposit into an oven at 110°C for 2 hours, cool it to room temperature, put it into a muffle furnace and raise the temperature to 600°C at 5°C / min, perf...

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Abstract

The invention provides a catalyst for improving the content of cycloalkane in tar through microwave pyrolysis of low-rank coal as well as a preparation method and application of the catalyst, belonging to the technical field of microwave catalytic pyrolysis of low-rank coal. According to the catalyst for improving the cycloalkane content in the tar through microwave pyrolysis of the low-rank coal, catalytic active substances play a main catalytic role, and a cocatalyst can improve the connecting capacity of a catalyst carrier and the catalytic active substances, so the catalytic active substances are not leached in a reaction process, and the stability and the service life of the catalyst are improved; and the catalyst carrier has a high dielectric coefficient and a large specific surface area, can effectively improve the microwave absorption capability of the whole catalyst, improves a heating rate, accelerates a reaction speed, promotes a pyrolysis reaction, promotes the generation of small molecular free radicals, and increases the yield of pyrolysis tar and the content of cycloalkane in the pyrolysis tar.

Description

technical field [0001] The invention relates to the technical field of microwave catalytic pyrolysis of low-rank coal, in particular to a catalyst for increasing the content of naphthenes in tar through microwave pyrolysis of low-rank coal, a preparation method and application thereof. Background technique [0002] Coal tar obtained from low-rank coal pyrolysis contains a variety of high value-added products such as normal alkanes, cycloalkanes, aromatic hydrocarbons, phenols, and naphthalene compounds. Especially naphthenes, because of their high activation energy of autoxidation and large calorific value, are very suitable as raw materials for the synthesis of high-stability aerospace fuels. In addition, naphthenes are mostly used in the synthesis of high-quality lubricating oils and as intermediates in pharmaceutical synthesis. [0003] The content of heavy components in the tar obtained by the traditional coal pyrolysis process is relatively high, usually 40-50wt%, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J37/00B01J37/02B01J37/03B01J37/08B01J37/34C10B53/04C10G1/00
Inventor 王晴东蔡文轩马晶晶杨旭萌李笑原李拓陈宇李文兵王光华
Owner WUHAN UNIV OF SCI & TECH
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